DMOS200
CDMOS200
VMOS200
CVMOS200
SERVICE MANUAL
S72M194DMOS2E
MICROWAVEOVEN
COOK
DMOS200
MODELS
CDMOS200
VMOS200
CVMOS200
(DMOS200modelshown)
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified
should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit that includes
High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc., and Magnetron, High
Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDEFRONTCOVER
BEFORESERVICING ...................................................................................................... INSIDEFRONTCOVER
WARNINGTOSERVICEPERSONNEL ................................................................................................................2
MICROWAVEMEASUREMENTPROCEDURE.....................................................................................................3
FOREWORDANDWARNING ................................................................................................................................5
PRODUCTSPECIFICATIONS...............................................................................................................................6
GENERAL INFORMATION ...................................................................................................................................6
OPERATION .........................................................................................................................................................8
TROUBLESHOOTINGGUIDE .............................................................................................................................12
TESTPROCEDURE ............................................................................................................................................14
TOUCHCONTROLPANELASSEMBLY .............................................................................................................24
COMPONENTREPLACEMENTANDADJUSTMENTPROCEDURE ..................................................................31
PICTORIALDIAGRAM ........................................................................................................................................37
POWERUNITCIRCUIT .......................................................................................................................................38
LSI UNIT CIRCUIT...............................................................................................................................................39
PRINTEDWIRINGBOARD .................................................................................................................................40
PARTS LIST ........................................................................................................................................................41
PACKING AND ACCESSORIES .........................................................................................................................45
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
RangeCorporation
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
CDMOS200
DMOS200
VMOS200
CVMOS200
Notes
1
CDMOS200
DMOS200
VMOS200
CVMOS200
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following parts may result in a severe, possibly
fatal, electrical shock.
(Example)
HighVoltageCapacitor,HighVoltagePowerTrans-
former, Magnetron, High Voltage Rectifier Assem-
bly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
When the testing is completed,
1. Disconnect the power supply cord, and then remove
outer case.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is
installed.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
7. Run the oven and check all functions.
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for 60
secondsandthenshort-circuittheconnectionofthehigh-
voltage capacitor (that is the connecting lead of the high-
voltage rectifier) against the chassis with the use of an
insulated screwdriver.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Whenever troubleshooting is performed the power supply
must be disconnected. It may in, some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power
transformer.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefullycheckthatthewaterisnowhot.Ifthewaterremains
cold carry out Before Servicing procedure and re-examine
the connections to the component being tested.
5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and a microwave leakage test should be carried out.
2
CDMOS200
DMOS200
VMOS200
CVMOS200
MICROWAVE MEASUREMENT PROCEDURE (CANADA)
After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must
be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard
for microwave ovens as undermentioned.
A.Requirements:
Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with its service
controls and user controls adjusted to yield the maximum output, the leakage radiation, at all points at least 5 cm. from the
external surface of the oven, does not exceed:
1) 1.0mW/cm2 with the test load of 275 ± 15 ml of water at an initial temperature 20 ±5oC.
2) 5.0mW/cm2 when the outer enclosure is removed with a test load of 275 ± 15 ml of water at an initial temperature 20±5oC.
3) 5.0mW/cm2 without a test load.
B. Preparationfortesting:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
SurveyinstrumentsthatcomplywiththerequirementforinstrumentationasprescribedbyCSAandNHWperformancestandard
for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and NARDA 8200.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml of tap water initially at 20±5oC in the center of the oven cavity.
The water container shall be a low form of 600 ml beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made
of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) SetthecookingcontrolonFullPowerCookingMode,Closethedoorandselectacookcycleofseveralminutes.Ifthewater
begins to boil before the survey is completed, replace it with 275 ml of cool water.
C. Leakage test with enclosure installed :
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 2.5 cm/sec. along the gap, watching for the maximum indication on the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measurecarefullyatthepointofhighestleakageandmakesurethatthehighestleakageisnogreaterthan4mW/cm2,and
that the secondary interlock switch does turn the oven OFF before any door movement.
C. Leakagetestwithoutenclosure:
1) Remove the enclosure (cabinet).
2) Grasp the probe of the survey instrument and hold it perpendicular to all mechanical and electric parts of the oven that is
accessible to the user of the oven including, but not limited to, the waveguide, cavity seams, magnetron gap between the
door and the body of the oven.
3) Move the probe slowly, not faster than 2.5 cm/sec. along the gap, watching for the maximum indication on the meter.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is under 5mW/cm2.
CAUTION:SpecialattentionshouldbegiventoavoidelectricalshockbecauseHIGHVOLTAGEisgeneratedduringthistest
No Load test
1) Operate the oven without a load and measure the leakage by the same method as the above test procedure " Leakage
test with enclosure installed"
2. Make sure that the highest leakage should not exceed 5mW/cm2.
NOTE: After servicing, record data on service invoice and microwave leakage report.
3
CDMOS200
DMOS200
VMOS200
CVMOS200
MICROWAVE MEASUREMENT PROCEDURE (USA)
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
shouldnotexceed1mW/cm2 atanypoint5cmormorefromtheexternalsurfaceoftheoven, measuredpriortoacquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches:
Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above
mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of
5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparationfortesting:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5O C (68OF) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and
made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode.
5) Closethedoorandselectacookcycleofseveralminutes.Ifthewaterbeginstoboilbeforethesurveyiscompleted,replace
it with 275 ml of cool water.
C. Leakagetest:
Closed-doorleakagetest(microwavemeasurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the
meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door, pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measurecarefullyatthepointofhighestleakageandmakesurethatthehighestleakageisnogreaterthan4mW/cm2,and
that the primary interlock switch/secondary interlock relay does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
4
CDMOS200
DMOS200
VMOS200
CVMOS200
SERVICE MANUAL
VIKING RANGE CORPORATION
PRODUCT DESCRIPTION
GENERALINFORMATION
OPERATION
MICROWAVEOVENS
DMOS200
CDMOS200
VMOS200
CVMOS200
FOREWORD
This Manual has been prepared to provide Viking Service Personnel with
OperationandServiceInformationfortheVikingMicrowaveOvens,DMOS200,
CDMOS200, VMOS200, CVMOS200.
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
It is recommended that service personnel carefully study the entire text of
this manual so that they will be qualified to render satisfactory customer
service.
Check the interlock switches and the door seal carefully. Special attention
should be given to avoid electrical shock and microwave radiation hazard.
TOUCH CONTROL PANEL
WARNING
COMPONENTREPLACEMENT
AND ADJUSTMENT PROCEDURE
Never operate the oven until the following points are ensured:
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
WIRINGDIAGRAM
PARTSLIST
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certaininitialpartsareintentionallynotgroundedandpresentariskof
electrical shock only during servicing. Service personnel - Do not
contactthefollowingpartswhiletheapplianceisenergized;
HighVoltageCapacitor,PowerTransformer,Magnetron,HighVoltage
RectifierAssembly, HighVoltageHarness;
Ifprovided,VentHood,Fanassembly,CoolingFanMotor.
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
VIKING RANGE CORPORATION
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
5
CDMOS200
DMOS200
VMOS200
CVMOS200
SPECIFICATION
ITEM
DESCRIPTION
PowerRequirements
120 Volts / 13.0 Amperes/1500Watts
60 Hertz
Singlephase, 3wiregrounded
PowerOutput
1100watts(IEC-705TESTPROCEDURE)
Operatingfrequencyof2450MHz
CaseDimensions
Width 24"
Height 13-3/8"
Depth 19-1/8"
Cooking Cavity Dimensions
2.0 Cubic Feet
Width 17-3/8"
Height 10-1/2"
Depth 18-5/8"
Tray Size 15"
Control Complement
Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI ................................................. Full power throughout the cooking time
P-90 .................................................................... approx. 90% of Full Power
P-80 .................................................................... approx. 80% of Full Power
P-70 .................................................................... approx. 70% of Full Power
P-60 .................................................................... approx. 60% of Full Power
P-50 .................................................................... approx. 50% of Full Power
P-40 .................................................................... approx. 40% of Full Power
P-30 .................................................................... approx. 30% of Full Power
P-20 .................................................................... approx. 20% of Full Power
P-10 .................................................................... approx. 10% of Full Power
P-0 .....................................................No power throughout the cooking time
Sensor option pads, Breakfast pad, Lunch pad, Add a minute pad, Frozen
food pads, Beverage pad, Number pad, Timer/Clock pad, Clock pad, Power
level pad, Stop/Clear pad, Start touch pad, preset recipes pad, 15 minute
dinners pad, warm/hold pad and Defrost pad.
Cavity Light
Yes
SafetyStandard
UL and CUL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J and Canadian Standards
Association. Health CANADA.
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
Intheeventofanelectricalshortcircuit,groundingreducestheriskofelectricshockbyprovidinganescapewirefortheelectric
current.
WARNING:
Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15or20amp.fusedelectricalsupply.Itisrecommendedthataseparatecircuitservingonlythisappliancebeprovided.When
installing this appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
Whereatwo-prongedwall-receptacleisencountered,itisthepersonalresponsibilityandobligationofthecustomertocontact
a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding
6
CDMOS200
DMOS200
VMOS200
CVMOS200
adapter properly grounded and polarized. If the extension cord must be
used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape
overacountertoportablewhereitcanbepulledonbychildrenortripped
over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-
MOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
OVEN DIAGRAM
1. One touch door open button.
Push to open door.
2. Door latches.
5
6
7
12
The oven will not operate unless the
door is securely closed.
3. Removable turntable support.
4. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
9
11
8
1
10
2
4
5. Oven lamp.
3
It will light when oven is operating or
door is opened.
6. Oven door with see-through window.
7. Ventilation openings. (Rear)
8. Auto-Touch control panel.
10. Turn table motor shaft
11. Wave guide cover.
12. Power supply cord
9. Time display: Digital display, 99
minutes 99 seconds.
TOUCH CONTROL PANEL
COOK
NOTE:
Thedirectedfeaturesaredisabled
afteroneminutewhentheovenis
not in use. These features are
automatically enabled when the
door is opened and closed or the
STOP/ CLEAR pad is pressed.
(VMOS200 model shown)
7
CDMOS200
DMOS200
VMOS200
CVMOS200
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
Thefollowingisadescriptionofcomponentfunctionsduring
oven operation.
the primary switch and primary and is mechanically
associated with the door so that it will function in the
followingsequence.
1) Whenthedooropensfromtheclosedposition,theprimary
switch, secondary switch, door sensing switch, and
secondary interlock relay open their contacts and the
monitor switch contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts of
the primary switch and door secondary switch close.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show flashing"WELCOME,
PRESS CLEAR"
If the primary switch and the secondary switch primary
contacts are closed when the door is opened, the monitor
switchcontactsformashortcircuitthroughthemonitorfuse,
primary switch and secondary switch causing the monitor
fuse to blow.
Tosetanyprogramorsettheclock,youmustfirsttouch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad and then a Number pad.
When the START pad is touched, the following operations
occur:
POWER LEVEL P-0 TO P-90 COOKING
WhenVariableCookingPowerisprogrammed,the120volts
A.C. is supplied to the power transformer intermittently
throughthecontactsofrelay(RY-2)whichisoperatedbythe
control unit within a 32 second time base. Microwave power
operation is as follows:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
VARI-MODE
ON TIME
32 sec.
OFF TIME
0 sec.
Power 10(P-HI)
(100% power)
RELAY
RY-1
CONNECTED COMPONENTS
oven lamp/turntable motor/fan motor
power transformer
Power 9(P-90)
30 sec.
26 sec.
24 sec.
22 sec.
18 sec.
16 sec.
12 sec.
8 sec.
2 sec.
6 sec.
(approx. 90% power)
RY-2
Power 8(P-80)
(approx. 80% power)
Power 7(P-70)
(approx. 70% power)
Power 6(P-60)
(approx. 60% power)
Power 5(P-50)
(approx. 50% power)
Power 4(P-40)
(approx. 40% power)
Power 3(P-30)
(approx. 30% power)
Power 2(P-20)
(approx. 20% power)
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2370 volts A.C. on the high voltage winding.
3. Thefilamentwindingvoltageheatsthemagnetronfilament
and the H.V. winding voltage is sent to a voltage doubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-
box, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. Whenthedoorisopenedduringacookcycle,themonitor
switch, secondary switch, door sensing switch, primary
switch and secondary interlock relay are activated with
the following results. The circuits to the turntable motor,
the cooling fan motor, and the high voltage components
are de-energized, the oven lamp remains on, and the
digital read-out displays the time still remaining in the
cook cycle when the door was opened.
8 sec.
10 sec.
14 sec.
16 sec.
20 sec.
24 sec.
26 sec.
32 sec.
Power 1(P-10)
(approx. 10% power)
6 sec.
Power 0(P-0)
(0% power)
0 sec.
Note: TheON/OFFtimeratiodoesnotcorrespondwiththe
percentageofmicrowavepower,becauseapprox.2
seconds are needed for heating of the magnetron
filament.
7. The monitor switch electrically monitors the operation of
8
CDMOS200
DMOS200
VMOS200
CVMOS200
2. The coil of shut-off relay (RY-1) is energized, the
turntablemotorareturnedon,butthepowertransformer
is not turned on.
SENSOR COOKING CONDITION
3. After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwaveenergyisproducedandfirststageisstarted.
The 16 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.
UsingtheSENSOR function,foodiscookedwithoutfiguring
time,powerlevelorquantity. Whentheovensensesenough
steam from the food, it relays the information to its
microprocessor which will calculate the remaining cooking
timeandpowerlevelneededforbestresults. Whenthefood
is cooked, water vapor is developed. the sensor "senses"
the vapor and its resistance increase gradually. When the
resistance reaches the value set according to the menu,
supplementary cooking is started.
NOTE: During this first stage, do not open the door or touch
STOP/CLEAR pad.
4. When the sensor detects the vapor emitted from the
food,thedisplayswitchesovertotheremainingcooking
time and the timer counts down to zero.
Thetimeofsupplementarycookingisdeterminedbyexperi-
ment with each food category and inputted into the LSI. An
example of how sensor works: (Potatoes)
At this time, the door may be opened to stir, turn or
season food.
5. Whenthetimerreacheszero,anaudiblesignalsounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR pad,
the time of the day will reappear on the display and the
oven will revert to an OFF condition. When the timer
reaches zero, an audible signal sounds.
1. Potatoes at room temperature. Vapor is emitted very
slowly.
2.Heat Potatoes. Moisture and humidity is emitted very
rapidly. You can smell the aroma as it cooks.
3.Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Touch one of the SENSOR pads.
NOTE: The oven should not be operated on sensor
immediately after plugging in the unit. Wait two
minutes before cooking on SENSOR.
9
CDMOS200
DMOS200
VMOS200
CVMOS200
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
S E C ONDAR Y
S WITC H
P R IMAR Y
S WITC H
C OM.
N.O.
C OM.
N.O.
TTM
OL
FM
C AP AC ITOR 1.0µF
AC 2300V
DOOR
S E NS ING
S WITC H
N.O.
C OM.
C OM.
A1
B1
B2
H
A2
N
120V AC
60 Hz
P OWE R
TR ANS FOR ME R
(R Y-2)
G R N
(R Y-1)
N.C .
MONITOR
S WITC H
S E C ONDAR Y
INTE R LOC K
R E LAY
C OM.
H.V. R E C TIFIE R
N.O.
C ONTR OL UNIT
MAG NE TR ON
C OM.
NOIS E FILTE R UNIT
Figure O-1 Oven Schematic - Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
S E C ONDAR Y
S WITC H
P R IMAR Y
S WITC H
C OM.
N.O.
C OM.
N.O.
TTM
OL
FM
C AP AC ITOR 1.0µF
AC 2300V
DOOR
S E NS ING
S WITC H
N.O.
C OM.
C OM.
A1
B1
B2
H
A2
N
120V AC
60 Hz
P OWE R
TR ANS FOR ME R
(R Y-2)
G R N
(R Y-1)
N.C .
MONITOR
S WITC H
S E C ONDAR Y
INTE R LOC K
R E LAY
C OM.
H.V. R E C TIFIE R
N.O.
C ONTR OL UNIT
MAG NE TR ON
C OM.
NOIS E FILTE R UNIT
Figure O-2 Oven Schematic - Cooking Condition
10
CDMOS200
DMOS200
VMOS200
CVMOS200
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
open, the monitor fuse blows simultaneously with closing
of the monitor switch contacts.
Thedoorisopenedbypushingtheopenbuttononthecontrol
panel, refer to the Figure D-1. When the open button is
pushed,theopenbuttonpushesuptheswitchlever,andthen
the switch lever pushes up the latch head. The latch heads
are moved upward and released from latch hook. Now the
door will open.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE, TEST MONITOR SWITCH AND PRI-
MARY SWITCH FOR PROPER OPERATION.
(REFERTOCHAPTER"TESTPROCEDURE").
NOTE: MONITOR FUSE, AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
Latch Heads
TURNTABLE MOTOR
The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. The turntable may turn in either
direction.
Door Sensing
Switch
Door
COOLING FAN MOTOR
Monitor Switch
Thecoolingfanmotordrivesabladewhichdrawsexternalcool
air. This cool air is directed through the air vanes surrounding
themagnetronandcoolsthemagnetron.Thisairischannelled
through the oven cavity to remove steam and vapors given off
from the heating foods. It is then exhausted through the
exhausting air vents at the oven cavity.
Secondary
Switch
Switch Lever
Primary
Switch
Figure D-1. Door Open Mechanism
MONITOR FUSE
PRIMARY SWITCH, SECONDARY SWITCH &
DOOR SENSING SWITCH
1. The monitor fuse blows when the contacts (COM-NO) of
the primaryswitchremainclosedwiththeovendooropen
and when the monitor switch closes.
2. If the wire harness or electrical components are short-
circuited, this monitor fuse blows to prevent an electric
shock or fire hazard.
The primary switch and secondary switch mounted parrallel
to each other horizontally in the lower positions of the latch
hook, the door sensing switch is mounted horizontally in the
upper position of the latch hook. They are activated by the
latchheadonthedoor.Whenthedoorisopened,theswitches
interruptthepowertoallhighvoltagecomponents,exceptthe
oven lamp . A cook cycle cannot take place until the door is
firmly closed thereby activating all interlock switches. The
secondary interlock system consists of the door sensing
switch and the secondary interlock relay located on the
control circuit board.
CAVITY TEMPERATURE FUSE
The cavity temperature fuse located on the top of the oven
cavity,isdesignedtopreventdamagetotheovenbyfire.Ifthe
food load is overcooked, by either error in cook time or defect
in the control unit, the cavity temperature fuse will open.
Under normal operation, the cavity temperature fuse remains
closed. However, when abnormally high temperatures are
reachedwithintheovencavity,thecavitytemperaturefusewill
open at 302oF(150oC) causing the oven to shut down.
NOTE: This is fuse. It does not reset.
MONITOR SWITCH
Themonitorswitchisactivated(thecontactsopened)bythe
latchheadonthedoorwhilethedoorisclosed. Theswitchis
intendedtorendertheoveninoperative,bymeansofblowing
themonitorfuse,whenthecontactsoftheprimary switchfail
to open when the door is opened.
MAGNETRON TEMPERATURE FUSE
Themagnetrontemperaturefuselocatednearthemagnetronis
designedtopreventdamagetothemagnetronifanoverheated
condition develops in the tube due to cooling fan failure,
obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the magnetron temperature fuse
remainsclosed.However,whenabnormallyhightemperatures
arereachedwithinthemagnetron,themagnetrontemperature
fusewillopenat302oF(150oC)causingtheoventoshutdown.
NOTE: This is fuse. It does not reset.
Functions:
1. Whenthedoorisopened, themonitorswitchcontactclose
(totheONcondition)duetotheirbeingnormallyclosed. At
this time the secondary interlock relay, primary switch and
secondaryswitchareintheOFFcondition(contactsopen)
due to their being normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contactsarefirstopenedandthenthedoorsensingswitch,
primary switch and secondary switch contacts close. (On
openingthedoor,eachoftheseswitchesoperateinversely.)
3. If the door is opened, primary switch and contacts fail to
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CDMOS200
DMOS200
VMOS200
CVMOS200
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the primary switch, and monitor
switch, before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be
replaced. Use part FFS-BA016/KIT as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be
necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
12
CDMOS200
DMOS200
VMOS200
CVMOS200
CK = Check / RE = Replace
CKCKCK J K L M N
RE RE A B C D E E F F G H RE RE CK
I
TESTPROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
PROBLEM
CONDITION
Home fuse or circuit breaker blows
when power cord is plugged into
wall receptacle
Monitor fuse blows when power
cord is plugged into wall receptacle.
OFF
CONDITION
All letters and indicators do not
appear in display when power cord
is first plugged into wall outlet.
Display does not operate properly
when STOP/CLEAR key is
touched. (Buzzer should sound and
":" or time of day should appear in
display.)
Oven lamp does not light when door
is opened.
Oven lamp does not go out when
door is closed.
Oven lamp lights but fan motor
and turntable motor do not operate.
Oven does not go into cook cycle
when START pad is touched
Oven seems to be operating but
little or no heat is produced in oven
load. (Food incompletely cooked or
not cooked at all at end of cook
cycle.)
COOKING
CONDITION
Oven goes into a cook cycle but
extremely uneven heating is
produced in oven load (food).
Oven does not cook properly when
programmed for Cooking Power 5
mode. (Operates properly on
Cooking Power 10 (HIGH) mode.)
Oven goes into COMPU DEFROST
but food is not defrosted well.
AH sensor does not end during
sensor cooking condition. (Oven
does not shut off after a cup of water
is boiling by sensor cooking)
SENSOR
COOKING
CONDITION
Oven stops at 16 sec. after starting
TEST PROCEDURES
COMPONENT TEST
PROCEDURE
LETTER
A
MAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
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CDMOS200
DMOS200
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CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check
across the magnetron filament leads should indicate less than 1 ohm.
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance
the magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
Thefollowingtestprocedureshouldbecarriedoutwiththemicrowaveoveninafullyassembledcondition
(outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD
BE OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test
shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing
componentsorwiring:siliconrectifier,highvoltagecapacitorandpowertransformer.Thistestwillrequire
a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type
temperature tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with
athermometerorthermocoupletemperaturetester.Stirthethermometerorthermocouplethroughthe
water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60
secondscooktime.Allowthewatertoheatfor60seconds,measuringwithastopwatch,secondhand
of a watch or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the
thermometer or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 38
to 78oF(21 to 42.6oC) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power
output(lowriseinwatertemperature)whichwouldextendcookingtimeorhighpoweroutput(highrise
in water temperature) which would reduce cooking time. Because cooking time can be adjusted to
compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 120 volts and the oven cavity is clean.
B
POWER TRANSFORMER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of
the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
14
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
C
HIGH VOLTAGE RECTIFIER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance
across the terminals and observe, reverse the leads to the rectifier terminals and observe meter
reading. If a short is indicated in both directions, or if an infinite resistance is read in both directions,
the rectifier is probably defective and should be replaced.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
D
HIGH VOLTAGE CAPACITOR TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Ifthecapacitorisopen, nohighvoltagewillbeavailabletothemagnetron. Disconnectinputleadsand
check for short or open between the terminals using an ohmmeter.
Checkingwithahighohmscale,ifthehighvoltagecapacitorisnormal,themeterwillindicatecontinuity
for a short time and should indicate an open circuit once the capacitor is charged. If the above is not
the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals
and case. If it is shorted, replace the capacitor.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
E
CAVITY TEMPERATURE FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Acontinuitycheckacrossthecavitytemperaturefuseterminalsshouldindicateaclosedcircuitunless
thetemperatureofthe cavitytemperaturefusereachesapproximately302oF(150oC). Anopen cavity
temperaturefuseindicatesoverheatingoftheoven,exchangethe cavitytemperaturefuseandcheck
inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for
restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
MAGNETRON TEMPERATURE FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the magnetron temperature fuse terminals should indicate a closed circuit
unless thetemperatureof themagnetrontemperaturefusereachesapproximately302oF(150oC). An
open magnetron temperature fuse indicates overheating of the magnetron. Check for restricted air
flow to the magnetron, especially the cooling fan air guide.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
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CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
COMPONENT TEST
LETTER
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA-
TURE, REPLACE TEMPERATURE FUSE.
F
PRIMARYANDSECONDARYSWITCHTEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolatetheswitchandconnecttheohmmetertothecommon(COM.)andnormallyopen(NO)terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the secondary interlock switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
SECONDARYINTERLOCKSYSTEMTEST
DOORSENSINGSWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolatetheswitchandconnecttheohmmetertothecommon(COM.)andnormallyopen(NO)terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the door sensing switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: If the doorsensingswitchcontactsfailintheopenpositionandthedoorisclosed, thecoolingfan,
turntable and oven light will be activated by RY1.
SECONDARYINTERLOCKRELAY(RY2)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnecttwo(2)wireleadsfromthemaletabterminalsoftheSecondaryInterlockRelay.Checkthe
state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts
are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G
MONITORSWITCHTEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Before performing this test, make sure that the primary switch is operating properly, according to the
aboveSwitchTestProcedure.Disconnectthewireleadfromthemonitorswitch(COM)terminal.Check
themonitorswitchoperationbyusingtheohmmeterasfollows.Whenthedoorisopen,themetershould
indicateaclosedcircuit.Whenthemonitorswitchactuatorispushedbyascrewdriverthroughthelower
latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the
monitorswitchispushedin),themetershouldindicateanopencircuit.Ifimproperoperationisindicated,
the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor
switch (COM) terminal and check the continuity of the monitor circuit.
16
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all
Screw Driver
functions.
RED
WHT/WHT
Monitor
Switch
Ohmmeter
Secondary Interlock Switch
Primary Interlock Switch
H
BLOWN MONITOR FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the monitor fuse is blown when the door is opened, check the primary switch and monitor switch
according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY SWITCH AND
MONITORSWITCHFORPROPEROPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
bereplacedwith"monitorfuseandmonitorswitchassembly"partnumberFFS-BA016/KIT,evenifthe
monitorswitchoperatesnormally.Themonitorfuseandmonitorswitchassemblyiscomprisedofa20
ampere fuse and switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
I
TOUCHCONTROLPANELASSEMBLYTEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control
Unit and Key Unit, and also the Control Unit is divided into two units, LSI Unit and Power Unit, and
troubleshooting by unit replacement is described according to the symptoms indicated.
Before testing,
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
1. Key Unit.
NOTE ;
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Check Key unit ribbon connection before replacement.
5) Reconnect all leads removed from components during testing.
6) Re-install the outer case (cabinet).
7) Reconnect the power supply cord after the outer case is installed.
8) Run the oven and check all functions.
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DMOS200
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CVMOS200
TEST PROCEDURES
COMPONENT TEST
PROCEDURE LETTER
The following symptoms indicate a defective key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the Key unit is defective.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Replace the Key unit.
5) Reconnect all leads removed from components during testing.
6) Re-install the outer case (cabinet).
7) Reconnect the power supply cord after the outer case is installed.
8) Run the oven and check all functions.
2. Control Unit
Thefollowingsymptomsindicateadefectivecontrolunit.Beforereplacingthecontrolunit,performthe
Key unit test (Procedure J) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
h) The following symptoms indicate a defective LSI unit.
• When touching the keys on the touch screen, a certain key produces no signal at all.
• When touching a number key on the touch screen, two figures or more are displayed.
• When touching the keys on the touch screen, sometimes a key produces no signal.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
When testing is completed,
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Reconnect all leads removed from components during testing.
5) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions..
J
KEY UNIT TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contactsareclosedwhenthedoorisclosedandopenwhenthedoorisopen.Ifthedoorsensingswitch
(stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and
make sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire
between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control
unitrespondsbyclearingwithabeepthekeyunitisfaultyandmustbereplaced.Ifthecontrolunitdoes
not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
5. Reconnect all leads removed from components during testing.
18
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G 1
G 2
G 3
G 4
G 5
G 6
G 7
G 8
Beverages
1
6
2
7
3
8
4
5
0
G 9
G10
G11
G12
G13
G14
Fresh
Vegetables
Preset
Recipes
Rice
9
START
Timer
Clock
Ground
Meat
Warm/
Hold
Add-A-
Minute
Snacks
Poultry
TOUCH START
V
egetables
Stop
Clear
Fish
Seafood
BREAKFAST
Defrost
Power
Level
15 Minute
Dinners
Entrees
Lunch
Baked
Potatoes
Reheat
Help
Popcorn
K
RELAY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ............. Defective relay.
DC. voltage not indicated ........ Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
RY1
RY2
Approx. 24.0V D.C.
Approx. 23.0V D.C.
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10. Discharge high voltage capacitor.
11. Reconnect all leads removed from components during testing.
12. Re-install the outer case (cabinet).
13. Reconnect the power supply cord after the outer case is installed.
14. Run the oven and check all functions.
COMPU DEFROST TEST
L
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the Defrost pad and touch the number pad 5 twice.
Then touch the start pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
1ST STAGE
2ND STAGE
WEIGHT
0.5lb
LEVEL
70%
TIME
30sec.
LEVEL
40%
TIME
15sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
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CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
COMPONENT TEST
LETTER
M
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added
to the primary on the PWB, this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
2
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
5) Make a visual inspection of the varistor.
Check for burned damage and
examine the transformer with a tester
for the presence of layer short-circuit
(checktheprimarycoilresistancewhich
isapproximately210ohm± 15%). Ifany
abnormal condition is detected, replace
the defective parts.
CN - A
(J1)
d
a
b
c
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.
2.Followthetroubleshootingguidegivenbelow,ifindicatordoesnotlightupafterabovecheckandrepairs
are finished.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
The rated AC voltage is not present between
1
Pin No. 1 of the 2-pin connector (A) and the Check supply voltage and oven power cord.
common terminal of the relay RY1.
The rated AC voltage is present at primary
side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
2
8) Disconnect the power supply cord, and then remove outer case.
9) Open the door and block it open.
10) Discharge high voltage capacitor.
11) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.
20
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N
AH SENSOR TEST
Checking the initial sensor cooking condition
Warning: The oven should be fully assembled before following procedure.
1) The oven should be plugged in at least two minutes before sensor cooking.
2) Room temperature should not exceed 95oF(35oC).
3) The unit should not be installed in any area where heat and steam are generated. The unit should not
be installed for example, next to conventional surface unit. Refer to the "INSTALLATION
INSTRUCTIONS" of the operational manual.
(4) Exhaustventsareprovidedonthebackoftheunitforproper coolingandairflowinthecavity.Topermit
adequate ventilation, be sure to install so as not to block these vents. There should be some space
for air circulation.
(5) Besuretheexteriorofthecookingcontainerandtheinterioroftheovenaredry. Wipeoffanymoisture
with dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapor given of by the spray and turn off before food is properly cooked.
(8) If the sensor has not detected the vapor of the food, ERROR will apear and the oven will shut off.
Water load cooking test
Warning: The oven should be fully assembled before following procedure.
Make sure the oven the oven has been plugged in at least two minutes before checking sensor cook
operation . the cabinet should be installed and screws tightened.
(1) The oven should be plugged in at least two minutes before sensor cooking
(2) Fill approximately 200 milliliters (7.2 oz) of tap water in 1000 milliliters measuring cup.
(3) Place the container on the center of tray in the oven cavity.
(4) Close the door.
(5) Touch the Timer/Clock pad once, the Power Level pad twice, the Start pad once and the number pad
once. Now, theovenisinthesensorcookingconditionand"TEST", "SENSOR"and"COOK" willappear
in the display.
(6) The oven will operate for the first 16 seconds, without generating microwave energy.
NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during the first stage
of sensor cooking.
(7) After approximately 16 seconds, microwave energy is produced.
If ERROR is displayed, replace the AH sensor or check the control unit, refer to explaination below. If the
oven stops after 5 minutes and ERROR is displayed, check the parts except for the AH sensor.
TESTING METHOD FOR AH SENSOR AND /OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.
(1) Disconnect the power supply cord, and then remove outer case.
(2) Open the door and block it open.
(3) Discharge high voltage capacitor.
(4)Remove the AH sensor.
(5)Install the new AH sensor.
(6)Reconnect all leads removed from components during testing.
(7)Re-install the outer case (cabinet)
(8) Reconnect the power supply cord after the outer case is installed.
(9)Reconnect the oven to the power supply and check the sensor cook operation as follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Touch the Timer/Clock pad once, the Power Level pad once and the number pad once.
9-5. The control panel is in automatic sensor operation.
9-6.Thedisplaywillstarttocountdowntheremainingcookingtime,andtheovenwillturnoffautomatically
after the water is boiling (bubbling).
If new sensor does not operate properly, the problem is with the control unit, and refer to explanation below.
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CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
CHECKING CONTROL UNIT
(1) Disconnect the power supply cord, and then remove outer case.
(2) Open the door and block it open.
(3) Discharge high voltage capacitor.
(4) Disconnect the sensor connector that is mounted to control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Disconnect the leads to the primary of power transformer.
(7) Ensurethattheseleadsremainisolatedfromothercomponentsandovenchassisbyusinginsulation
tape.
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1 Touch Timer/Clock pad once, the Power Level pad twice, the Start pad once and the number pad
once.
9-2 The control panel is in the sensor cooking operation.
9-3 After approximately 25 seconds, push plunger of select switch for more than 3 seconds.
This condition is same as judgement by AH sensor.
9-4 After approximately 3 seconds, the display shows "xx.xx" which is remaining cooking time, and
the display count down.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10)Disconnect the power supply cord, and then remove outer case.
(11)Open the door and block it open.
(12)Discharge high voltage capacitor.
(13)Reconnect the sensor connector that is mounted to control panel.
(14)Carry out the necessary repair.
(15)Reconnect all leads removed from components during testing and repairing.
(16)Re-install the outer case (cabinet)
(17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all
functions
(18)Carry out the "water load cooking test" again and ensure that the oven work properly.
22
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENTTEST
N
NOISE FILTER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Using an ohm-meter, check between the terminals as described in the following table:
NOISEFILTERUNIT
MONITOR
FUSE
NOISESUPPRESSIONCOIL
LINECROSSCAPACITOR
0.22uF/AC250V
LINEBYPASSCAPACITOR
0.0033uF/AC125V
LINEBYPASSCAPACITOR
0.0033uF/AC125V
GRY
RED
MEASURINGPOINT INDICATION OF OHM-METER
Between N and H Open Circuit
Between terminal N and GRY Short Circuit
Between terminal H and RED
Short Circuit
If incorrect readings are obtained, replace the noise filter.
6. Reconnect all leads removed from components during testing.
7. Re-install the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
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CDMOS200
DMOS200
VMOS200
CVMOS200
TOUCH CONTROL PANEL ASSEMBLY
OUTLINEOFTOUCHCONTROLPANEL
4) RelayCircuit
The touch control section consists of the following units.
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit
and LSI Unit).
5) BuzzerCircuit
The buzzer is responsive to signals from the LSI to emit
audiblesounds(keytouchsoundandcompletionsound).
Theprincipalfunctionsoftheseunitsandthesignalscommu-
nicated among them are explained below.
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercialfrequency.
KeyUnit
Thekeyunitiscomposedofamatrix,signalsgeneratedinthe
LSI are sent to the key unit through P00-P07.
Whenakeypadistouched,asignaliscompletedthroughthe
key unit and passed back to the LSI through P14, P15, P16,
P17, AIN6 and AIN7 to perform the function that was
requested.
7) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
ControlUnit
8) BackLightCircuit
Control unit consists of LSI, ACL circuit, indicator circuit,
powersourcecircuit,relaycircuit,buzzercircuit,synchroniz-
ing signal circuit, absolute humidity sensor circuit and back
light circuit.
A circuit to drive the back light (Light emitting diodes
LD10-LD15).
9) AbsoluteHumiditySensorCircuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
1) ACL
ThiscircuitgeneratesasignalwhichresetstheLSItothe
initial state when power is supplied.
2) IndicatorCircuit
This circuit consists of 40 segments and 16 common
electrodes using a Liquid Crystal Display.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
Symbol
VC
Voltage
-5V
Application
LSI(IC1)
24
CDMOS200
DMOS200
VMOS200
CVMOS200
LSI(IXA098DR)
The I/O signal of the LSI(IXA098DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
1
COM5
OUT
Common data signal : COM11.
Connected to LCD signal COM11.
2
3
COM4
COM3
COM2
COM1
COM0
VL1-VL4
VL5
OUT
OUT
OUT
OUT
OUT
IN
Common data signal : COM12.
Connected to LCD signal COM12.
Common data signal : COM13.
Connected to LCD signal COM13.
4
Common data signal : COM14.
Connected to LCD signal COM14.
5
Common data signal : COM15.
Connected to LCD signal COM15.
6
Common data signal : COM16.
Connected to LCD signal COM16.
7-10
11
Power source voltage input terminal.
Standard voltage for LCD.
IN
Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
12-14
15
C3-C1
VLIN
VREG
NC
IN
IN
Terminal not used.
Terminal not used.
Terminal not used.
Terminal not used.
16
OUT
_
17
18
VSS
IN
Power source voltage : -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
19-21
22-26
27
P27-P25
P24-P20
P47
OUT
IN
Terminal not used.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
28
29
P46
P45
OUT
OUT
Terminal not used.
Oven lamp, fan motor and turntable motor driving signal.
16.7 msec.
To turn on and off shut off relay (RY1). The
H : GND
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
L : -5V
During cooking
30
P44
OUT
Magnetron high-voltage circuit driving signal.
OFF
H : GND
To turn on and off the cook relay (RY2). The
signalsholds"L"levelduringmicrowavecook-
ing and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
100 %
70 %
ON
L : -5V
OFF
OFF
H : GND
24 sec.
ON
8 sec.
L : -5V
(ON and OFF times for other power level.)
31
32
P43
OUT
OUT
Terminal not used.
0.1 sec.
CNTR0
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
H : GND
A
L : -5V
2.0 sec.
B: Completion sound.
H : GND
B
L : -5V
33
P41
OUT
Terminal not used.
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DMOS200
VMOS200
CVMOS200
Pin No.
Signal
I/O
Description
34
INT0
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
H : GND
L : -5V
16.7 msec.
35
36
37
38
39
40
41
42
43
44
45
46
47
48
P07
P06
P05
P04
P03
P02
P01
P00
P17
P16
P15
P14
AIN7
AIN6
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G1 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G2 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G3 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G4 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G5 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN6, AIN7, P14, P15, P16
and P17 terminal while one of G6 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G7 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and
P17 terminal while one of G8 line keys on key matrix is touched.
Signal coming from touch key.
When either G9 line on key matrix is touched, a corresponding signal out of P00-P07 will
be input into P17. When no key is touched, the signal is held at "H" level.
Signal similar to P17.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P16.
IN
Signal similar to P17.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P15.
IN
Signal similar to P17.
When either G12 line on key matrix is touched, a corresponding signal will be input into
P14.
IN
Signal similar to P17.
When either G13 line on key matrix is touched, a corresponding signal will be input into
AIN7.
IN
Input terminal to judge the model.
The signal out of P02 will be input into AIN6 through G6 line on key matrix. The LSI will
judge the model by this signal.
26
CDMOS200
DMOS200
VMOS200
CVMOS200
Pin No.
Signal
I/O
Description
49
AIN5
IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/
D converter built into the LSI.
50
51
AIN4
IN
IN
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analoginputterminalfromtheAHsensorcircuit,andconnectedtotheA/Dconverterbuilt
into the LSI.
RESET
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
"L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"
level
_
52
53
54
55
56
NC
XCOUT
XCIN
NC
Terminal not used.
Terminal not used.
Connected to VC.
Terminal not used.
OUT
IN
_
VCC
IN
Powersourcevoltage:GND(0V).
The power source voltage to drive LSI is input to VCC terminal.
57
58
OSCSEL
XOUT
IN
ConnectedtoVC(-5V).
OUT
Internal clock oscillation output.
Output to control oscillation input of XIN.
59
VSS
IN
IN
Powersourcevoltage:-5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
60
61
NC
Terminal not used.
XIN
Internal clock oscillation frequency control input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
_
62
NC
Terminal not used.
63-66
AIN3-AIN0
IN
Terminal to change cooking input according to the Model.
ByusingtheA/DconvertercontainedintheLSI,DCvoltageinaccordancewiththeModel
in operation is applied to set up its cooking constant.
67
68
COM8
COM9
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
Common data signal : COM8. Connected to LCD signal COM8.
Common data signal : COM7. Connected to LCD signal COM7.
Common data signal : COM6. Connected to LCD signal COM6.
Common data signal : COM5. Connected to LCD signal COM5.
Common data signal : COM4. Connected to LCD signal COM4.
Common data signal : COM3. Connected to LCD signal COM3.
Common data signal : COM2. Connected to LCD signal COM2.
Common data signal : COM1. Connected to LCD signal COM1.
Terminal not used.
69
COM10
COM11
COM12
COM13
COM14
COM15
70
71
72
73
74
75-102
SEG67-SEG40 OUT
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DMOS200
VMOS200
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103-142
SEG39-SEG0 OUT
Segment data signal.
ConnectedtoLCD.
The relation between signals and LCD are as follows:
LSI signal (Pin No.)
LCDsegment
LSI signal (Pin No.)
LCDsegment
SEG 39 (103) .......................... SEG 1
SEG 38 (104) .......................... SEG 2
SEG 37 (105) .......................... SEG 3
SEG 36 (106) .......................... SEG 4
SEG 35 (107) .......................... SEG 5
SEG 34 (108) .......................... SEG 6
SEG 33 (109) .......................... SEG 7
SEG 19 (123) ......................... SEG 21
SEG 18 (124) ......................... SEG 22
SEG 17 (125) ......................... SEG 23
SEG 16 (126) ......................... SEG 24
SEG 15 (127) ......................... SEG 25
SEG 14 (128) ......................... SEG 26
SEG 13 (129) ......................... SEG 27
SEG 32 (110) .......................... SEG 8
SEG 31 (111) .......................... SEG 9
SEG 30 (112) .......................... SEG 10
SEG 29 (113) .......................... SEG 11
SEG 28 (114) .......................... SEG 12
SEG 27 (115) .......................... SEG 13
SEG 26 (116) .......................... SEG 14
SEG 25 (117) .......................... SEG 15
SEG 24 (118) .......................... SEG 16
SEG 23 (119) .......................... SEG 17
SEG 22 (120) .......................... SEG 18
SEG 21 (121) .......................... SEG 19
SEG 20 (122) .......................... SEG 20
SEG 12 (130) ......................... SEG 28
SEG 11 (131) ......................... SEG 29
SEG 10 (132) ......................... SEG 30
SEG 9 (133) ......................... SEG 31
SEG 8 (134) ......................... SEG 32
SEG 7 (135) ......................... SEG 33
SEG 6 (136) ......................... SEG 34
SEG 5 (137) ......................... SEG 35
SEG 4 (138) ......................... SEG 36
SEG 3 (139) ......................... SEG 37
SEG 2 (140) ......................... SEG 38
SEG 1 (141) ......................... SEG 39
SEG 0 (142) ......................... SEG 40
143
144
COM7
COM6
OUT
OUT
Common data signal : COM9. Connected to LCD signal COM9.
Common data signal : COM10. Connected to LCD signal COM10.
28
CDMOS200
DMOS200
VMOS200
CVMOS200
ABSOLUTE HUMIDITY SENSOR CIRCUIT
With this voltage given, the switches SW1 to SW5 in the
(1) Structure of Absolute Humidity Sensor
Theabsolutehumiditysensorincludestwothermistorsas
shown in the illustration. One thermistor is housed in the
closed vessel filled with dry air while another in the open
vessel. Eachsensorisprovidedwiththeprotectivecover
made of metal mesh to be protected from the external
airflow.
LSI are turned on in such a way as to change the
resistance values in parallel with R107 ~ R111 of IC2 .
Changing the resistance value results in that there is the
same potential at both F-3 terminal of the absolute
humiditysensorandAN0terminaloftheLSI. Thevoltage
of AN1terminalwillindicatabout16secondsabout -2.50
V. This initial balancing is set up about 16 seconds after
theunitisputintheSensorCookingmode. Asthesensor
cookingproceeds,thefoodisheatedtogeneratemoisture
by which the resistance balance of the bridge circuit is
deviatedtoincreasethevoltageavailableatAN1terminal
of the LSI.
Thermistors
ventilation opening for sensing
Sensing part
Sensing part
(Open vessel)
(Closed vessel)
Then the LSI observes that the voltage at AN1 terminal
and compares it with its initial value, and when the
comparisonratereachesthepresetvalue(fixedforeach
menu to be cooked), the LSI causes the unit to stop
sensor cooking; thereafter, the unit goes in the next
operation automatically. When the LSI starts to detect
the initial voltage at AN1 terminal 16 seconds after the
unithasbeenputinthe SensorCookingmode, ifitisnot
possible to balance of the bridge circuit due to
disconnection of the absolute humidity sensor, ERROR
will appear on the display and the cooking is stopped.
(2) Operational Principle of Absolute Humidity Sensor
Thefigurebelowshowsthebasicstructureofan absolute
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors(R1 and R2). The output of
the bridge circuit is to be amplified by the operational
amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150oC (302oF), the resultant heat is
dissipated in the air and if the two thermistors are placed
in different degrees of heat conductivity leading to a
potential difference between them causing an output
voltage from the bridge circuit, the intensity of which is
increased as the absolute humidity of the air inceases.
Since the output is very minute, it is amplified by the
operationalamplifier.
1) Absolute humidity sensor circuit
SW1
620k
300k
150k
26
25
24
23
22
R98
P20
P21
P22
P23
P24
SW2
SW3
SW4
SW5
R99
R100
R101
R102
75k
37.4k
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
Absolute humidity vs,
output voltage characteristic
Operational
R97
47k
50
C
S
R1
R2
amplifier
AIN4
Output
voltage
+
C93
LSI
(IC1)
F-1
C
F-3
R96
R91
S : Thermistor
open vessel
C91
C92
3.57k
R94
R95
49
8
7
2
6
3
5
4
R3
C : Thermistor
90
AIN5
C
1
closed vessel
10k
47k
S
R92
1.8k
3.32k
Absolute humidity (g/m2)
R93
F-2
IC2
D91
360k
(3) Detector circuit of Absolute Humidity Sensor circuit
This detector circuit is used to detect the output voltage
of the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
then the detector circuit starts to function and the LSI
observes the initial voltage available at its AN1 terminal.
D90
VC : -5V
VA : -15V
VA : -15V
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CDMOS200
DMOS200
VMOS200
CVMOS200
TOUCH CONTROL PANEL SERVICING
1. Precautions for Handling Electronic Components
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremelyhighimpedanceatitsinputandoutputterminals.
For this reason, it is easily influenced by the surrounding
high voltage power source, static electricity charge in
clothes,etc.andsometimesitisnotfullyprotectedbythe
built-in protection circuit.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to the
oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, it is possible to check and repair the controls of
the touch control panel while keeping it apart from the
oven proper; in this case you must short both ends of the
door sensing switch (on PWB) of the touch control panel
withajumper,whichactivatesanoperationalstatethatis
equivalent to the oven door being closed. As for the
sensor-related controls of the touch control panel,
checking them is possible if dummy resistor(s) with
resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table
approx. 1M ohm
2. Shapes of Electronic Components
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch(onPWB)ofthetouchcontrolpanel,whichactivates
an operational state that is equivalent to the oven door
being closed. Connect an external power source to the
power input terminal of the touch control panel, then it is
possible to check and repair the controls of the touch
control panel it is also possible to check the sensor-
related controls of the touch control panel by using the
dummy resistor(s).
2. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautionsyoumusttakewhendoingso.Toperformthe
servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1) Servicing the touch control panel with power supply
of the oven:
3. Servicing Tools
Toolsrequiredtoservicethetouchcontrolpanelassembly.
1) Soldering iron: 30W
(Itisrecommendedtouseasolderingironwithagrounding
terminal.)
2) Oscilloscope:Singlebeam,frequencyrange:DC-10MHz
type or more advanced model.
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore,beforecheckingtheperformanceofthetouch
control panel,
1) Disconnect the power supply cord, and then remove
outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.
3) Others: Hand tools
4. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control unit
being sure that the lead wires are not twisted.
3) Afteraluminiumfoilisremoved, becarefulthatabnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Besuretousespecifiedcomponentswherehighprecision
is required.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
transformer.
4) Re-install the outer case (cabinet).
30
CDMOS200
DMOS200
VMOS200
CVMOS200
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE:
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Avoidpossibleexposuretomicrowaveenergy.Pleasefollowtheinstructionsbelowbeforeoperating
WARNING:
the oven.
1. Disconnect the power supply cord.
1. Door does not close firmly.
2. Make sure that a definite” click” can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise,
it is then possible to hear a “click’ as the door switches
operate.)
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
3. Visuallycheckthedoorandcavityfaceplatefordamage
(dents, cracks, signs of arcing etc.).
7. There is visible damage to the oven.
Do not operate the oven:
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
WARNING FOR WIRING
To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the following parts;
1) High voltage parts:
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
andmakesurethatthewireleadsdonot comeoffeven
if the wire leads are pulled.
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Ovenlamp,Magnetron,Highvoltagetransformerand
Oven cavity.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect the power supply cord.
4. Remove the remaining two (2) screws from rear and four
(4) screws along the right side of outer case.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the
rear cabinet using a T20H Torx type or GTXH20-100
screw driver.
5. Slide the entire outer case back out about 1 inch (3 cm)
to free it from retaining clips on the cavity face plate.
6. Lift entire outer case from the unit.
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CDMOS200
DMOS200
VMOS200
CVMOS200
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CA-
PACITORBEFORETOUCHINGANYOVEN
COMPONENTS OR WIRING.
Special screw
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
POWER TRANSFORMER REMOVAL
Re-install
1. Disconnectthepowersupplycordandthenremoveouter
case.
1. Rest transformer on the bottom plate with its primary
terminals toward the oven face plate.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads (primary and high voltage) from
power transformer and the filament leads from the
magnetron and capacitor terminals.
5. Remove four (4) screws holding transformer to bottom
plate.
6. Remove transformer from bottom plate.
2. Secure transformer with four screws to bottom plate.
3. Re-connect wire leads (primary and high voltage) to
power transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM" on page 33.
4. Re-install outer case and check that oven is operating
properly.
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
7. Remove one (1) screw holding capacitor holder with the
high voltage rectifier to the base plate.
8. Disconnect rectifier terminal from capacitor.
High voltage rectifier assembly is now free.
1. Disconnectthepowersupplycordandthenremoveouter
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire A from the high voltage
capacitor.
5. Disconnect the high voltage wire of high voltage rectifier
assembly from the magnetron.
6. Disconnect the filament lead (short one) of the power
transformer from the high voltage capacitor.
9. Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
MAGNETRON REMOVAL
Removal
Re-install
1. Disconnectthepowersupplycordandthenremoveouter
case.
1. Re-install the magnetron to waveguide flange with care
to prevent damage to the magnetron antenna.
2. Secure the magnetron with the four (4) screws.
3. Holdthechassissupporttotheovencavityfrontplateand
the magnetron with the two (2) screws.
4. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM" on page 33.
5. Re-installoutercaseandcheckthattheovenisoperating
properly.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from magnetron.
5. Remove the two (2) screws holding the chassis support
to the magnetron and the oven cavity front flange.
6. Slide the magnetron duct slightly so that the two (2)
screws at left hand side of the magnetron appear.
7. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
8. Remove the magnetron with care so that the magnetron
antennaisnothitbyanymetalobjectaroundtheantenna.
9. Now, the magnetron is free.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THER.F. GASKETISINPLACEANDMOUNT-
ING SCREWS ARE TIGHTENED SECURELY
32
CDMOS200
DMOS200
VMOS200
CVMOS200
OVEN LAMP AND LAMP SOCKET REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
Oven lamp
socket
3. Discharge high voltage capacitor.
4. Remove the oven lamp from the oven lamp socket.
5. Pullthewireleadsfromtheovenlampsocketby pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
6. Remove the oven lamp socket from the magnetron duct
by turning the socket counterclockwise.
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
7. Remove the oven lamp from the socket by turning the
oven lamp.
8. Now, the oven lamp and the oven lamp socket are free.
Figure C-1. Oven lamp socket
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Terminal
1. Disconnect the power supply cord, and then remove
Positive lock¨
connector
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
1
Push
Lever
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS, CON-
NECT THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.
2
Pull down
Figure C-2. Positive lock® connector
CONTROL PANEL ASSEMBLY REMOVAL
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
1. Disconnectthepowersupplycordandthenremoveouter
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from panel components.
5. Remove the one (1) screw holding the control panel
assembly to the oven cavity front plate.
LSI UNIT
NOTE: Handle the LSI unit carefully so that there is no
excessive force applied to the ribbon connection.
Ribbon cable
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
NOTE: 1. Beforeattachinganewkeyunit,wipeoff remaining
adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel
frame,adjusttheupperedgeandrightedgeofthe
key unit to the correct position of control panel
frame.
LSI unit
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")
6. Remove one (1) screw holding turntable motor to oven
cavity.
7. Now the turntable motor is free.
8. Afterreplacementusetheone(1)screwtofittheturntable
motor cover.
2. Removeturntableandturntablesupportfromovencavity.
3. Lay the oven on it's backside. Remove the turntable
motor cover by snipping off the material in four corners.
4. Where the corners have been snipped off bend corner
areasflat. Nosharpedgesmustbeevidentafterremoval
of the turntable motor cover.
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CDMOS200
DMOS200
VMOS200
CVMOS200
COOLING FAN MOTOR REMOVAL
REMOVAL
CAUTION:
1. Disconnectthepowersupplycordandthenremoveouter
case.
*
Donotreusetheremovedfanbladebecausethehole
(for shaft) may be larger than normal.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor.
5. Remove the two (2) screws holding the fan motor to the
oven cavity back plate.
6. Removethefanbladefromthefanmotorshaftaccording
to the following procedure.
7. Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
INSTALLATION
1. Installthefanbladetothefanmotorshaftaccordingtothe
following procedure.
2. Holdthecenterofthebracketwhichsupportstheshaftof
the fan motor on the flat table.
3. Apply the screw lock tight into the hole (for shaft) of the
fan blade.
4. Install the fan blade to the shaft of fan motor by pushing
thefanbladewithasmall,lightweight,ballpeenhammer
or rubber mallet.
CAUTION:
*
Makesurethatnometalpiecesenterthegapbetween
the rotor and the stator of the fan motor because the
rotoriseasilyshavenbypliersandmetalpiecesmay
be produced.
CAUTION:
*
*
*
Do not hit the fan blade strongly when installed
because the bracket may be disfigured.
Make sure that the fan blade rotates smooth after
installation.
*
*
Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
Do not disfigure the bracket by touching with the
pliers.
Make sure that the axis of the shaft is not slanted.
5. Installthefanmotortothetheovencavitybackplatewith
the two (2) screws.
6. Connect the wire leads to the fan motor, referring to the
pictorial diagram.
8. Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
9. Now, the fan blade and the fan motor will be free.
Coil
Groove joint pliers
Shaft
Stator
Shaft
Axis
These are the positions
that should be pinched
with pliers
Gap
Table
Center of
bracket
Bracket
Rotor
Stator
Rotor
Rear View
Rear View
Side View
Side View
AH SENSOR REPLACEMENT
REMOVAL
RE-INSTALL
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the two (2) screws holding the AH sensor to the
sensor duct.
5. Disconnect the AH sensor harness from the connector
CN-F on control unit.
6. AH sensor is now free
1. Insert the new AH sensor into the sensor duct.
2. Install two (2) screws to secure the AH sensor.
3. Route the AH sensor harness across the oven cavity top
plate and through the large opening.
4. Connect the AH sensor harness to CN-F on control unit.
5. Re-install the outer case cabinet and check for proper
operation.
DOORSENSINGSWITCH/PRIMARYSWITCH/SECONDARYSWITCHANDMONITORSWITCHREMOVAL
8. Switch is now free.
At this time switch lever will be free, do not lose it.
Re-install
1. Re-installeachswitchinitsplace.Thesecondaryinterlock/
monitor switches are in the lower position and the door
sensing switch is in the upper position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
1. Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from the switches.
5. Remove two (2) screws holding latch hook to oven flange.
6. Remove latch hook assembly from oven flange.
7. Pushoutwardonthetwo(2)retainingtabsholdingswitch
in place.
34
CDMOS200
DMOS200
VMOS200
CVMOS200
3. Securelatchhook(withtwo(2)mountingscrews)tooven
flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to chapter
"Test Procedure" and Adjustment procedure.
DOORSENSINGSWITCH/PRIMARYSWITCH/SECONDARYSWITCHANDMONITORSWITCHADJUSTMENT
1. Disconnectthepowersupplycord,andthenremoveouter
hook,pushingandpullingupperportionofdoortowardthe
case.
oven face. Both results (play in the door) should be less
than 0.5mm.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
2. The door sensing switch, primary switch and secondary
Ifthedoorsensingswitch, primaryswitch, secondaryswitch
switchinterruptthecircuitbeforethedoorcanbeopened.
and monitor switch do not operate properly due to a
3. Monitor switch contacts close when door is opened.
misadjustment, the following adjustment should be made.
4. Re-install outer case and check for microwave leakage
4. Loosenthetwo(2)screwsholdinglatchhooktotheoven
around door with an approved microwave survey meter.
cavity front flange.
(RefertoMicrowaveMeasurementProcedure.)
5. Withdoorclosed,adjustlatchhookbymovingitbackand
forth,andupanddown.Inandoutplayofthedoorallowed
by the upper and lower position of the latch hook should
belessthan0.5mm.Theverticalpositionofthelatchhook
Latch Heads
should be adjusted so that the door sensing switch,
primary switch and secondary switch are activated with
the door closed. The horizontal position of the latch hook
Door Sensing
Switch
should be adjusted so that the plunger of the monitor
switch is pressed with the door closed.
Door
6. Secure the screws with washers firmly.
7. Checktheoperationofallswitches.Ifeachswitchhasnot
activated with the door closed, loosen screw and adjust
the latch hook position.
Monitor Switch
Secondary
Switch
Switch Lever
Afteradjustment, checkthefollowing.
Primary
Switch
1. In and out play of door remains less than 0.5mm when in
the latched position. First check upper position of latch
hook,pushingandpullingupperportionofdoortowardthe
oven face. Then check lower portion of the latch
Figure C-3. Latch Switch Adjustments
DOOR REPLACEMENT
REMOVAL
1. Disconnect the power supply cord.
9. Release the door panel from twelve (12) tabs of door
frame.
2. Push the open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-4 to free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown
Figure C-4.
10.Remove the door panel from the door frame.
11.Now, door panel with sealer film is free.
12.Tear sealer film from door panel.
13.Now, door panel is free.
14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
5. Release choke cover from door panel.
6. Now choke cover is free.
15.Now, latch head and latch spring are free.
16.Remove door screen from door frame
17.Now, door frame is free.
7. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
8. Now, doorpanelwithdoorframeisfreefromovencavity.
RE-INSTALL
Choke Cover
1. Re-install door screen to door frame.
2. Re-installthelatchspringtothelatchhead.Re-installthe
latch spring to the door frame. Re-install latch head to
door frame.
3. Re-install door panel to door frame by fitting twelve (12)
tabs of door frame to twelve (12) holes of door panel.
4. Putsealerfilmondoorpanel.Referto“SealerFilm”about
how to handle new one.
Door Frame
Putty Knife
5. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
Figure C-4. Door Disassembly
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CDMOS200
DMOS200
VMOS200
CVMOS200
SEALER FILM
6. Re-install choke cover to door panel by pushing.
Installation
Note: After any service to the door;
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-6.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel
(A) Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
chapter “Test Procedures”.).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Check for microwave leakage around door with an
approvedmicrowavesurveymeter. (RefertoMicrowave
Measurement Procedure.)
Note: The door on a microwave oven is designed to act as
an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle.Thisfunctiondoesnotrequirethatdoorbeair-
tight, moisture (condensation)-tight or light-tight.
Therefore,occasionalappearanceofmoisture,light
or sensing of gentle warm air movement around
oven door is not abnormal and do not of themselves
indicate a leakage of microwave energy from oven
cavity.
Figure C-6. Sealer film
Figure C-5. Door Replacement
36
CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
H C T I S W
R O T I M O
N
G
G
G - N C
R Y G
H
H
6
4
5
2
1
3
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CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
C N-C
12P IN LE AD
WIR E HAR NE S S
Q2 2S B1238
R 4 27
C 10
LE D
D5
D6
R 5 4.7k
D1-D4
11E S 1
T1
1
3
4
6
A 1
D1
D2
C N-A
AC
1S S 270A 1S S 270A
D3
C
2
G ND
A 2
+
–
+
–
d
D4
a
b
VC
C
3
R 3 510 1/2w
Q1 2S B1238
R 2 680 1/2w
C
C
C
1
4
9
VA
INT
VR
c
S P 1 P KM22E P T
OVE N LAMP
TUR NTABLE
MOTOR
R Y1
NO
FAN MOTOR
Q3 KR C 243M
C
C
5
6
BUZZE R
R 6 3.3k
AC
C OM
OVE N LAMP
TUR NTABLE
MOTOR
+
–
FAN MOTOR
R Y2
MIC R O
NC
C
C
7
8
NO
MIC R O
C OM
DOOR
S E NS ING
S WITC H
B
B
2
2
C 11
C 12
NC
DOOR
S E NS ING
S WITC H
G
G
H
H
Figure S-2 Power Unit Circuit
6
4
5
2
1
3
38
CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
C10 47µ/16v
C11 0.1µ/50v
LD15 LD14
R60 15k
R61 15k
R62 15k
R63 15k
R64 15k
R65 15k
R66 15k
R67 15k
C12
0.1µ/50v
C90 0.1µ/50v
R98
620k
R96
3.57kD
R99
300k
R12 15k
R100
150kF
C13 0.01µ/25v
1
2
3
4
8
7
6
5
R101
75kF
R102
37.4kF
R10 1k
ZD10
UDZ4.3B
Q10
2SA1037AK
C91 0.1µ/50v
R11 15k
R40
4.7k
C14 0.01µ/25v
AIN0
(J11) 4.7k
(J13) 4.7k
(J15) 4.7k
(J17)
(J10)
(J12)
AIN4
AIN5
AIN1
AIN2
AIN3
R95
15k
C60 330p/50v
C40 0.01µ/25v
(J14)
C61 330p/50v
C62 330p/50v
C63 330p/50v
C64 330p/50v
C65 330p/50v
(J16) 4.7K
R74 270k
R75 270k
R76 270k
R77 270k
R78 270k
R79 270k
7
R16 R15
4.7k 4.7k 4.7k 4.7k 4.7k
R19 R18 R1
COM0
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
COM5
COM6
P05
P04
P03
P02
P01
P00
P17
P16
P15
P14
AIN7
AIN6
AIN5
AIN4
CO
SE
SE
SE
SE
SE
M7
G0
G1
G2
G3
G4
SEG
5
SE
SE
G6
G7
SEG
8
SE
G9
SEG10
SE
G11
SEG
12
RESET
NC
XCOUT
XCIN
NC
SE
G13
SEG
SEG
SEG
SEG
14
15
16
17
VCC
SE
G18
OSCSEL
XOUT
VSS
NC
XIN
NC
AIN3
AIN2
AIN1
SEG
SEG
SEG
19
20
21
SE
G22
SEG
SEG
SEG
SEG
SEG
23
24
25
26
27
G
G
AIN0
SE
SE
G28
G29
COM8
COM9
COM10
COM11
COM12
COM13
SEG
SEG
SEG
30
31
32
SEG8
SEG7
SE
G33
SEG6
SEG5
SEG34
SEG4
SEG3
SEG2
SEG1
SEG39
COM15
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM8
H
H
6
4
5
2
1
3
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CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
1
9
1
(CN - C)
CN - C
C3
C4
12
1
3
R5
R3
1
2
C5
R2
4
E
ZD1
B
Q3
R1
R6
D8
2
1
SP1
D
U
CN - B
VRB
C2
C1
10
D4
D2
D1
D3
CN - A
(J1)
D9
(CN - D)
(D10)
G
RY1 OL FM
TTM
G
RY3
H
H
Figure S-5 Printed Wiring Board of Power Unit
6
4
5
2
1
3
40
CDMOS200
DMOS200
VMOS200
CVMOS200
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q'TY
ELECTRICPARTS
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-11
1-12
1-13
1-14
1-15
PM100021
High voltage capacitor
High voltage rectifier assembly
Oven lamp socket
Oven lamp
Fan motor
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
PM100005
PM100018
PM100022
PM100024
PM100004
PM100019
PM100016
PM100017
PM100026
PM100023
PM100025
PM100002
PM100003
PM100008
Monitorswitch(V-16G-2C25)andfuseassembly(20A250VAC)
Secondary interlock switch and door sensing switch (V-5230Q)
Magnetron temperature fuse 150½C
Cavity temperature fuse 150½C
Magnetron
∆
∆
Turntablemotor
Powertransformer
Power supply cord
AH sensor
Noise filter
CABINETPARTS
2- 1
2- 2
2- 3
PM110009
PM110010
PM110007
Base plate
Foot
Outer case cabinet
1
4
1
CONTROLPANELPARTS
3- 1
3- 2
3- 2
3- 3
3- 3
3- 4
3- 5
3- 6
3- 7
PM100001
PM100007
PM100006
PM110014
PM110013
PM120008
PM100015
PM100014
PM120026
Control unit
1
1
1
1
1
1
1
1
3
Control panel frame with key unit (DMOS200/CDMOS200)
Control panel frame with key unit (VMOS200/CVMOS200)
Openbutton(DMOS200/CDMOS200)
Openbutton(VMOS200/CVMOS200)
Open button spring
LED sheet
LCD holder
Screw; 3mm x 10mm
OVENPARTS
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
4-12
4-13
4-14
PM100013
PM110017
PM120014
PM120006
PM120013
PM110018
PM120011
-------------
PM110020
PM120015
PM120012
PM120010
PM120009
PM110016
H.V. Capacitor band
Chassissupport
Latch hook
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Switch lever
Magnetron duct
Fan blade
Fan duct
Oven cavity (Not a replaceable part)
Waveguidecover
Turntable motor packing
Sensor duct
Cushion
Cushion
Noise filter angle
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CDMOS200
DMOS200
VMOS200
CVMOS200
REF. NO.
PART NO.
DESCRIPTION
Q'TY
DOORPARTS
5 -1
5 -1
5 -1
5 -1
5-1-1
5-1-2
5 -2
5- 3
5- 4
5- 5
5- 6
5- 7
PM110003
Door frame assembly (DMOS200)
Door frame assembly (CDMOS200)
Door frame assembly (VMOS200)
Door frame assembly (CVMOS200)
Latch head
1
1
1
1
1
1
1
1
1
2
3
6
PM110004
PM110001
PM110002
PM120001
PM120007
PM110005
PM120016
PM110008
PM120032
PM120033
PM120026
Latch spring
Door panel
Sealer film
Choke cover
Door cushion
Door screws
Door screws
MISCELLANEOUS
6- 1
6- 2
6- 3
6- 4
6- 5
6- 6
6- 7
6- 8
6- 9
6-10
6-11
6-12
6-13
6-14
PM100011
PM100012
PM110006
PM110019
PM120034
PM120018
PM120024
PM100020
PM120035
PM120036
PM120017
PM120019
PM120021
PM120022
Stop switch harness
Main wire harness
Turntablesupport
Turntable tray
Monitor caution label
DHHS/Screw caution label
Operationmanual
High voltage wire A
Recipe card
Menu label
DHHS/GRD/BIKcaution
Health Canada label
User caution label
BIK height caution label
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SCREWS,NUTSANDWASHERS
7- 1
7- 2
7- 3
7- 4
7- 5
7- 6
7- 7
7- 8
7- 9
7-10
PM120002
PM120003
PM120028
PM120029
PM120030
PM120025
PM120004
PM120027
PM120037
PM120005
Special screw
5
3
Special screw
Screw : 4mm x 12mm
Screw
Screw : 4mm x 12mm
Screw : 3mm x 8mm
Special screw
Screw : 4mm x 8mm
Screw : 4mm x 12mm
Special screw (Torx tamper proof screw)
1
1
12
2
2
3
4
2
42
CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
OVEN AND CABINET PARTS
7-10
A
B
C
D
E
F
A
B
C
D
E
F
7-10
7-7
2-3
7-9
4-7
7-7
6-12
6-11
7-6
7-2
1-9
6-6
1-5
1-14
7-5
1-6
6-14
7-6
1-15
4-14
4-6
7-3
7-9
7-6
4-11
4-8
1-13
7-8
1-8
7-8
4-2
4-9
7-4
1-10
6-10
6-5
1-3
1-4
7-2
7-2
6-4
7-5
4-5
7-1
4-3
1-7
1-7
4-10
1-12
1-7
1-11
7-6
1-6
4-13
2-1
6-3
7-1
4-4
4-1
1-1
1-2
G
G
7-5
2-2
2-2
4-12
7-5
2-2
7-5
2-2
H
H
6
4
5
2
1
3
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CDMOS200
DMOS200
VMOS200
CVMOS200
6
4
5
2
1
3
CONTROL PANEL PARTS
3-1
A
B
C
D
E
F
A
B
C
D
E
F
3-2
3-7
3-7
6-13
3-6
3-5
3-3
3-4
5-4
5-7
5-2
DOOR PARTS
5-5
5-3
5-7
5-5
5-1-1
MISCELLANEOUS
5-1-2
5-6
G
G
6-1
5-1
6-2
H
H
6-8
Actual wire harness may be different from illustration.
6
4
5
2
1
3
44
CDMOS200
DMOS200
VMOS200
CVMOS200
PACKING AND ACCESSORIES
TOP PAD ASSEMBLY
DOOR PROTECTION SHEET
PLASTIC BAG
TRAY HOLDER
6-4 TURNTABLE TRAY
6-7 OPERATION MANUAL
6-9 RECIPE CARD
BOTTOM PAD ASSEMBLY
6-3 TURNTABLE SUPPORT
PACKING CASE
Non-replaceable items.
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CDMOS200
DMOS200
VMOS200
CVMOS200
COPYRIGHT © 2002 BY VIKING
ALL RIGHTS RESERVED
No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in
any form or by any means, electronic,
mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.
VIKING RANGE CORPORATION
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
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