Viking Microwave Oven CDMOS200 User Manual

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  
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CDMOS200  
DMOS200  
VMOS200  
CVMOS200  
Notes  
1
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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
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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
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CDMOS200  
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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
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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
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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
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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
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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
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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
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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  
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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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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  
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CDMOS200  
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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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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  
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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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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  
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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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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  
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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  
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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  
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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  
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CDMOS200  
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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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CDMOS200  
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  
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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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CDMOS200  
DMOS200  
VMOS200  
CVMOS200  
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  
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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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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  
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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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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  
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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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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  
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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.RefertoSealerFilmabout  
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  
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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
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  
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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
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  
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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  
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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  
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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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