Viking Designer DMOR200SS User manual

1
DMOR200SS
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICINGTO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY.....................INSIDE FRONT COVER
BEFORE SERVICING.......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL.................................................................................................................3
MICROWAVE MEASUREMENT PROCEDURE.....................................................................................................4
FOREWORD AND WARNING ...............................................................................................................................5
PRODUCT SPECIFICATIONS...............................................................................................................................6
GENERAL INFORMATION....................................................................................................................................6
OPERATION...........................................................................................................................................................9
TROUBLESHOOTING GUIDE.............................................................................................................................13
TEST PROCEDURE ............................................................................................................................................15
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE.................................................................27
PICTORIAL DIAGRAM.........................................................................................................................................35
DMOR200SS
MODEL
S39M307DMOR20
SERVICE MANUAL
for Microwave Oven
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

2
DMOR200SS
PRECAUTIONSTO BE OBSERVED BEFORE
AND DURING SERVICINGTO AVOID POSSIBLE
EXPOSURETO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Makethefollowingsafetychecksonallovenstobeservicedbeforeactivatingthemagnetron orother microwave
source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing
surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments,checkthemagnetron,waveguideortransmission line,andcavity for properalignment,integrity,
and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before
the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed
on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measure-
ment Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact Viking Service immediately @ 1-
888-845-4641.
If the unit operates with the door open, service person should (1) tell the user not to operate the oven and
(2) contact VIKING, plus the Department Of Health, Canada and/or the Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform VIKING of any certified unit found with emissions in excess of 4mW/
cm2.The owner of the unit should be instructed not to use the unit until the oven has been brought into
compliance.
NOTICE
In the interest of user-safety the oven should be restored to its original condition and only parts identical
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.
(HighVoltage Capacitor, HighVoltage PowerTransformer, Magnetron, HighVoltage Rectifier Assembly, High
Voltage Harness etc..)

3
DMOR200SS
WARNINGTO 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)
High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Before Servicing
1. Disconnect the power supply cord , and then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGETHE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for
60 seconds and then short-circuit the connection of the
high-voltage capacitor (that is the connecting lead of the
high-voltage rectifier) against the chassis with the use of
an insulated screwdriver.
Whenever troubleshooting is performed the power supply
mustbedisconnected.Itmay,insomecases,benecessary
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.
5. Ensure that these 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.
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.
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
coldcarryoutBeforeServicingprocedureandre-examine
the connections to the component being tested.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and microwave leakage test should be carried out.
Don'tTouch !
Danger High Voltage

4
DMOR200SS
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2at any point 5cm or more from the external surface of the oven, measured prior to
acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2at 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. Preparation for testing:
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:
USA Survey instruments that comply with the requirement for instrumentation as prescribed by the Federal Performance
Standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
Canadian Survey instruments that comply with the requirement for instrumentation as prescribed by CSA and NHW
performance standard for microwave ovens must be used for testing recommended instruments are , NARDA 8100 and
NARDA 8200.
2) 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 non conductive 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.
3) Set the cooking control on Full Power Cooking Mode.
4) Close the drawer and select a cook cycle of several minutes.If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-drawer leakage test (microwave measurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the drawer 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 drawer 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 drawer, pull the drawer away from the front of the oven as far as is permitted by
the closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/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.

5
DMOR200SS
PRODUCT DESCRIPTION
GENERAL INFORMATION
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
SERVICE MANUAL
MICROWAVE OVEN
DMOR200SS
FOREWORD
This Manual has been prepared to provide VIKING Products. Service
Personnel with Operation and Service Information for the VIKING MI-
CROWAVE OVENS.
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 atten-
tion should be given to avoid electrical shock and microwave radiation
hazard.
WARNING
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.
Servicing and repair work must be carried out only by trained service
personnel. DANGER
Certaininitialpartsareintentionallynotgroundedandpresent
ariskofelectricalshockonlyduringservicing.Serviceperson-
nel - Do not contact the following parts while the appliance
is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided,Vent Hood, Fan assembly, Cooling Fan Motor.
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
PREFERRED SERVICE
111 Front Street
Greenwood, Mississippi (MS) 38930 USA

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DMOR200SS
ITEM DESCRIPTION
Power Requirements 120 Volts / 13 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output 950 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions Width 29-15/16"
Height 16- 1/4"
Depth 15- 9/16"
Cooking Cavity Dimensions Width 17-1/2"
Height 9-7/8"
1.5 Cubic Feet Depth 14-15/16"
Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs
Hood fan Approx. 300 C.F.M.
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
KEEP WARM PLUS pad, POPCORN pad, HOT WATER pad
REHEAT pad, DEFROST pads, Number selection pads, REHEAT pads,
POWER LEVEL pad, TIMER / CLOCK pad, FRESH VEGETABLES pad,
LIGHT HI / LO button, FAN HI / LO button, SENSOR COOK pads,
STOP/CLEAR button, START/ ADD-A-MINUTE button, HELP pad.
Oven Cavity Light 20W x 1 Incandescent light bulb
Safety Standard CUL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Sub chapter J and Canadian Standards
Association. Health CANADA.
Weight Approx. 55 lbs.
PRODUCT SPECIFICATION
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.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.

7
DMOR200SS
Electrical Requirements
The oven is equipped with a 3-prong grounding plug.DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDING PIN FROM THE PLUG.
The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line,
usingagroundedreceptacle.The receptacle shouldbelocated insidethecabinet directlyabovethe Microwave Oven/Hood
system mounting location.
OVEN DIAGRAM
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
Product Controls
Oven door with see-through1
window
Door hinges2
Waveguide cover3
DO NOT REMOVE.
Turntable motor shaft4
Oven light - on during operation5
and when the door is open.
Safety door latches - door must6
be securely closed for the oven
to operate.
Cook and time display7
LIGHT Hi/Lo pad - controls8
interior light
Press the LIGHT Hi/Lo pad once
for Hi. Press again for Lo. Press a
third time to turn the light o.
FAN Hi/Lo pad - controls fan9
Press the FAN Hi/Lo pad once
for Hi. Press again for Lo. Press a
third time to turn the fan o.
Control panel10
One touch DOOR OPEN11
Push to open door
Louver12
Nameplate13
Louver screws - remove14
screws to replace
charcoal lter.
Removable turntable15
- rotates clockwise or
counterclockwise
Only remove for cleaning
Removable turntable16
support
1. Carefully place the
turntable support in
the motor shaft in the
center of the oven
oor.
2. Place the turntable on
the turntable support
securely.
Heat deector17
16
2
34 5
7
8
9
10
12
15
16
6
11
13 17
1414
(Front of Microwave)
(Rear of Microwave)
18
19
Light cover18
Grease lters19
Bottom of Unit

8
DMOR200SS
NOTE: Some one-touch cooking features such as "ADD-A-MINUTE" are disabled after three minutes when the oven is
not used.These features are automatically enabled when the door is opened and closed or STOP/CLEAR button
is pressed.

9
DMOR200SS
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closingthedooractivatesthedoorsensingswitchandprimary
interlockswitch.(Inthiscondition, themonitorswitch 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 and
Press Clock".
To set any program or set the clock, you must first touch
the STOP/CLEAR button.The display will clear, and " : "
will appear .
COOKING CONDITION
Program desired cooking time touching the NUMBER pads.
When the START button is touched, the following operations
occur:
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)
RELAY CONNECTED COMPONENTS
RY1 Oven lamp / Fan motor / Turntable motor
RY2 Power transformer
RY3, RY4 Hood fan motor
RY5, RY6 Hood lamp
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 2000
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 wave guide into the cavity feed-
box, and then into the cavity where the food is placed to
be cooked.
5. Uponcompletionofthecookingtime,thepowertransformer,
oven lamp, etc. are turned off, and the generation of
microwave energy is stopped. The oven will revert to the
OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, secondary interlock
switch,third door switch and primary interlock relay are
activated with the following results.The circuits to the
stirrer motor, the cooling fan motor, the turntable
motor, and the high voltage components are de-
energized, and the digital read-out displays the time
still remaining in the cook cycle when the door was
opened.
7.The monitor switch is electrically monitoring the operation
of the secondary interlock switch, third door switch and
door sensing switch is mechanically associated with the
door so that it will function in the following sequence.
(1) When the door opens from a closed position, the
primary interlock relay, door sensing switch, third
door switch and secondary interlock switch open
their contacts, and then the monitor switch
contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the
contacts of the secondary interlock switch, third
door switch close.
If the secondary interlock switch and third door switch fail
with their contacts closed when the door is opened, the
closing of the monitor switch contacts will form a short
circuit through the monitor fuse, secondary interlock switch
and third door switch, causing the monitor fuse to blow.
POWER LEVEL P-0TO P-90 COOKING
When Variable Cooking Power is programmed, the 120 volts
A.C.issuppliedtothepowertransformerintermittentlythrough
the contacts of relay (RY2) which is operated by the control
unit within an interval second time base. Microwave power
operation is as follows:
VARI-MODE ON TIME OFF TIME
Power 10(P-HI) 32 sec. 0 sec.
(100% power)
Power 9(P-90) 30 sec. 2 sec.
(approx. 90% power)
Power 8(P-80) 26 sec. 6 sec.
(approx. 80% power)
Power 7(P-70) 24 sec. 8 sec.
(approx. 70% power)
Power 6(P-60) 22 sec. 10 sec.
(approx. 60% power)
Power 5(P-50) 18 sec. 14 sec.
(approx. 50% power)
Power 4(P-40) 16 sec. 16 sec.
(approx. 40% power)
Power 3(P-30) 12 sec. 20 sec.
(approx. 30% power)
Power 2(P-20) 8 sec. 24 sec.
(approx. 20% power)
Power 1(P-10) 6 sec. 26 sec.
(approx. 10% power)
Power 0(P-0) 0 sec. 32 sec.
(0% power)
Note: The ON/OFF time ratio does not correspond with the
percentage of microwave power, because approx. 3
seconds are needed for heating of the magnetron
filament.

10
DMOR200SS
To Duct
To Duct
Grease
Filter
Hood
Intake
Duct R
Hood Fan
Motor
Grease
Filter
To Duct
Hood
Intake
Duct R
Hood Fan
Motor
Hood
Intake
Duct R
Hood Exhaust
Louver
Hood Fan
Motor Charcoal
Filter
VENTILATION METHODS HOT AIR EXHAUST
1. VERTICAL VENTING
For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the
grease filters at the right and left sides of the base cover, up through the right and left sides of the oven cavity, then
discharged vertically at rear center top of the oven, into the customer's vent system.
2. HORIZONTAL VENTING
The air handing is the same asVERTICALVENTING except that the final air discharge is directed horizontally out from
the top rear of the oven into the customer's vent system.
3. RE-CIRCULATION (INSIDE VENTING)
The air handing is the same asVERTICALVENTING except that the final air discharge is directed horizontally through
the upper front of the oven into the kitchen.IN this case, the accessory charcoal filter RK-240 must be provided to filter
the air before it leaves the oven.

11
DMOR200SS
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. VARIABLE COOKING CONTROL
"HIGH".
Figure O-2. Oven Schematic-Cooking Condition
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
NOTE: " " indicates components with potential above 250V.
CAVITY THERMAL
CUTOUT
120VAC
60Hz
BLK
WHT BLK
WHT
GRN
MAGNETRON
TEMP
FUSE
PRIMARY
INTERLOCK
SWITCH
POWER
TRANSFORMER
MAGNETRON
HIGH
VOLTAGE
CAPACITOR
GRY
GND
GRY
COM. N.O.
N.C.
HIGH
VOLTAGE
RECTIFIER
NOISE
FILTER
RED RED
H
N
C1
C2
C3
L
GND
BLK
MONITOR
FUSE
COM.
WHT
GRY
BRN
BRN
WHT
B2
B1
CONTROL UNIT
N.O.
(RY2)
COM.
DOOR
SENSING
SWITCH
TTM FM
TURN
TABLE
MOTOR FAN
MOTOR
OVEN
LAMP
ORG
SECONDARY
INTERLOCK
RELAY
RED
F3
F2
F1
SENSOR
(RY1)
OVEN
LAMP
RELAY
HUMIDITY
BRN
THIRD
DOOR
SWITCHN.O.
COM.
COM.
MONITOR
SWITCH
OL
GRY
HOOD
HOOD
MOTOR
BLU
N.O.
HL
BLK
RED
ORG
BLK
BLK
GRY
B5
A5
RY4 RY6
RY5
RY3
NC
LOW
BLK
WHT
HIGH B7
B9
CAPACITOR
A1 A3 B1 B3
RED
YLW
GRY
WHT
GRY
BLU
BLU
BRN
RED
WHT
BRN
WHT
HL
BLU or
PNK
CUTOUT
THERMAL
HOOD FAN
RED or
WHT
WHT
WHT
GRY
GRY
CAVITY THERMAL
CUTOUT
120VAC
60Hz
BLK
WHT BLK
WHT
GRN
MAGNETRON
TEMP
FUSE
PRIMARY
INTERLOCK
SWITCH
POWER
TRANSFORMER
MAGNETRON
HIGH
VOLTAGE
CAPACITOR
GRY
GND
GRY
COM. N.O.
N.C.
HIGH
VOLTAGE
RECTIFIER
NOISE
FILTER
RED RED
H
N
C1
C2
C3
L
GND
BLK
MONITOR
FUSE
COM.
WHT
GRY
BRN
BRN
WHT
B2
B1
CONTROL UNIT
N.O.
(RY2)
COM.
DOOR
SENSING
SWITCH
TTM FM
TURN
TABLE
MOTOR FAN
MOTOR
OVEN
LAMP
ORG
SECONDARY
INTERLOCK
RELAY
RED
F3
F2
F1
SENSOR
(RY1)
OVEN
LAMP
RELAY
HUMIDITY
BRN
THIRD
DOOR
SWITCHN.O.
COM.
COM.
MONITOR
SWITCH
OL
GRY
HOOD
HOOD
MOTOR
BLU
N.O.
HL
BLK
RED
ORG
BLK
BLK
GRY
B5
A5
RY4 RY6
RY5
RY3
NC
LOW
BLK
WHT
HIGH B7
B9
CAPACITOR
A1 A3 B1 B3
RED
YLW
GRY
WHT
GRY
BLU
BLU
BRN
RED
WHT
BRN
WHT
HL
BLU or
PNK
CUTOUT
THERMAL
HOOD FAN
RED or
WHT
WHT
WHT
GRY
GRY

12
DMOR200SS
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOROPENMECHANISM
The door is opened by pulling the door handle, refer to the
Figure D-1.
simultaneouslywithclosingofthemonitorswitchcontacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY (RY2), SEC-
ONDARYINTERLOCKSWITCH,THIRDDOOR
SWITCH AND MONITOR SWITCH FOR
PROPER OPERATION. (REFER TO CHAP-
TER "TEST PROCEDURE").
NOTE: MONITOR FUSE, MONITOR SWITCH AND
SECONDARY INTERLOCK SWITCH ARE
REPLACED AS AN ASSEMBLY
TEMPERATUREFUSE(MG)
The temperature fuse located near the waveguide is
designed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the temperature fuse remains
closed. However, the temperature fuse will open at 302OF
(150OC) causing the oven to shut down.
THERMALCUT-OUT(HOOD)
This thermal cut-out located on the right base plate. It is
designed to automatically turn on the hood fan motor
whenever the hot air rising from the conventional range
belowcausesthetemperature at thethermalcut-out to rise
to 140OF (60OC) or higher, thus removing this hot air from
aroundmicrowaveoven.Whenthetemperaturearoundthe
thermalcut-outdrops to113OF(45OC) orlower, thethermal
cut-out shuts off the hood fan motor.
THERMAL CUT-OUT (CAVITY)
Thisthermal cut-outislocatedonthetopoftheoven cavity.
Itisdesignedto prevent damage to theovenunitif the food
in the oven catches fire due to overheating produced by
improper setting of cooking time or failure of control unit.
Under normal operation, the thermal cut-out remains
closed. However, the thermal cut-out will open at 293OF
(145OC) causing the oven to shut down.
TURNTABLEMOTOR
The turntable motor rotates the turntable located on the
bottomofthe oven cavity,sothat the foodsonthe turntable
cook evenly during cooking. Turntable will turn in either
direction.The turntablemotorcanbeturnedoffbytouching
TURNTABLE ON/OFF pad.
COOLINGFANMOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes
surrounding the magnetron and cools the magnetron. This
air is channelled 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.
HOODFANMOTOR
The hood fan motor is a two-speed, single-phase, double
Figure D-1. Door Open Mechanism
DOOR SENSING SWITCH, SECONDARY INTER-
LOCK SWITCHE AND THIRD DOOR SWITCH
The secondary interlock switch is mounted in the lower
position of the latch hook, the door sensing switch in the
primary interlock system is mounted in the upper position
of the latch hook and the third door switch is mounted on
upper position of the latch hook. They are activated by the
latch heads on the door. When the door is opened, the
switches interrupt the circuit to all components. A cook
cycle cannot take place until the door is firmly closed
thereby activating both interlock switches. The primary
interlock system consists of the door sensing switch and
primary interlock relay located on the control circuit board.
MONITORSWITCH
Themonitorswitchisactivated(thecontactsopened)bythe
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative by means of
blowing the monitor fuse when the contacts of the primary
interlock relay (RY2) and secondary interlock switch and
third door switch fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay (RY2),
secondary interlock switch and third door switch are in
the OFF condition (contacts open) due to their being
normally open contact switches. And the contacts of
relay (RY1) are in the ON condition (contacts close).
2. Asthedoorgoestoaclosedposition,themonitorswitch
contacts are first opened and then the door sensing
switchandthesecondaryinterlockswitchand thirddoor
switch contacts close. (On opening the door, each of
these switches operate inversely.)
3. If the door is opened, and the primary interlock relay
(RY2) and secondary interlock switch and third door
contacts fail to open, the monitor fuse blows
Door Sensing
Switch
Monitor Switch
Switch Lever
Secondary
Switch
Latch Heads
Door
Third door
Switch

13
DMOR200SS
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is
to remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.
HOOD LAMP
The hood lamps are mounted at the hood lamp angle on
the base cover. The hood lamps can be turned off and on
by touching the LIGHT HI/ LO button. And also the bright-
ness can be varied to high or low by touching the LIGHT
HI/ LO button.
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is con-
nected.
Whentroubleshooting the microwaveoven, it is helpfultofollow theSequenceofOperation in performingthe 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 monitor switch, relay (RY1)
primary interlock relay (RY2), door sensing switch , secondary interlock switch and third door switch
before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch and secondary interlock
switch must also be replaced. Use part FFS-BA018/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.

14
DMOR200SS
CK = Check / RE = Replace
POSSIBLE CASE AND
DEFECTIVE PARTS
PROBLEM
TEST PROCEDURE
CONDITION
OFF
CONDITION
IDLE
CONDITION
MICROWAVE
COOKING
CONDITION
Home fuse blows when power cord is plugged into wall receptacle. Monitor fuse blows when power cord is plugged into wall receptacle. Display does not illuminate when power cord is first plugged into wall receptacle. Display does not operate properly when STOP/CLEAR key is touched. (The time of day should appear on the display with beep sound during normal condition.) Oven lamp does not light with door is opened. Hood fan motor operates when power cord is first plugged into wall receptacle. Temperature of oven base seems more than 140
û
F (60
û
C) because of
operation of the range below. But hood fan motor does not turn on automatically. (Normally, food fan motor should be operating at low speed.) Hood lights do not turn on when WORK LIGHT pad or NIGHT LIGHT pad is pressed. Hood fan motor does not rotate at all with touched FAN HI/LO pad. Speed of the hood fan motor does not change when the FAN HI/LO pad is touched for this function. Oven lamp does not light in cook cycle. (But it does light when door is opened.) Fan motor does not operate. (Oven lamp and turntable motor operate.) Turntable motor does not operate (Oven lamp lights and fan motor 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.) Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food). Variable cooking does not operate properly except Cooking Power 10 (P- HI) mode. Function of COMPU DEFROST does not operate properly. Oven goes into COMPU DEFROST but food is not defrosted well.
CK LOW VOLTAGE
CK NO POWER AT OUTLET
RE SHORTED IN POWER CORD
CK OPENED OR SHORTED WIRING
CK HOOD MOTOR CAPACITOR
RE HOOD LAMP OR SOCKET
CK TURNTABLE OFF CONDITION
RE TURNTABLE MOTOR
RE FAN MOTOR
RE OVEN LAMP OR SOCKET
P FOIL PATERN ON P.W.B.
O DEFROST CENTER
N RELAY (RY-5)
N RELAY (RY-4)
N RELAY (RY-3)
N RELAY (RY-2)
N RELAY (RY-1)
M KEY UNIT
L CONTROL UNIT
K HOOD FAN MOTOR
J HOOD HERMAL CUT-OUT
I MONITOR FUSE
H MONITOR SWITCH
G PRIMARY INTERLOCK SYSTEM
F SECONDARY INTERLOCK SWITCH
E TEMPERATURE FUSE OR THERMAL CUT-OUT
D HIGH VOLTAGE CAPACITOR
C H.V. RECTIFIER
B POWER TRANSFORMER
A MAGNETRON
Q NOISE FILTER
& Door sens.

15
DMOR200SS
B POWERTRANSFORMERTEST
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
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. 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. Totest forashortedmagnetron,connecttheohmmeter leadsbetweenthe magnetronfilamentleads
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
The following test procedure should be carried out with the microwave oven in a fully assembled condi-
tion (outer case fitted).
HIGHVOLTAGES ARE PRESENT DURINGTHE 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 should only be used if above tests do not indicate a faulty magnetron and there is no defect in the
following components or wiring:silicon rectifier, high voltage capacitor and power transformer.This test
will require 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 a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple
through the 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
seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second
hand 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
29.2to54.2˚F(16.2to30.1˚C)riseintemperature.Ifthewatertemperaturesareaccuratelymeasured
and tested for the required time period the test results will indicate if the magnetron tube has low
power output (low rise in water temperature) which would extend cooking time or high power output
(high rise 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.
A MAGNETRON ASSEMBLYTEST
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 160 ohms (+ or - 5%); 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.

16
DMOR200SS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
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 capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads
and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity 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.
D HIGH VOLTAGE CAPACITORTEST
E CAVITYTHERMAL CUT-OUTTEST
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 thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293˚F(145˚C).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and
check 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.
MAGNETRONTEMPERATURE FUSETEST
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 temperature fuse terminals should indicate a closed circuit. If the
temperature of the magnetron reaches approximately 302˚F(150˚C), the temperature fuse opens.
An open temperature fuse indicates overheating of the magnetron. Check for restricted air flow to
the magnetron, especially the cooling fan air guide.
C HIGH VOLTAGE RECTIFIERTEST
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.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)

17
DMOR200SS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
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.
CAUTION: IFTHETHERMAL CUT-OUT ORTEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT
ROOMTEMPERATURE, REPLACETHERMAL CUT-OUT OR TEMPERATURE FUSE.
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 secondary interlock switch and the primary interlock
relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire
lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the
ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the
monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate
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 and third
door 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.
F SECONDARY INTERLOCK SWITCH AND THIRD DOOR SWITCH TEST
H MONITOR SWITCH TEST
G PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
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 door sensing switch contacts fail in the open position and the door is closed, the cooling
fan motor, stirrer motor and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY (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. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check
the 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.

18
DMOR200SS
I BLOWN MONITOR FUSETEST
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
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 secondary interlock relay, primary
interlockswitchandmonitorswitchaccordingtothe"TESTPROCEDURE"forthoseswitchesbefore
replacing the blown monitor fuse.
CAUTION:
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA016/KiT, even if
the monitor switch operates normally.The monitor fuse and monitor switch assembly is comprised
of a 20 ampere fuse and switch.
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.
plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is
pushed in), the meter should indicate an open circuit. If improper operation is indicated, 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.
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.
J HOODTHERMAL CUT-OUTTEST
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 thermal cut-out terminals should indicate an open circuit unless the
temperatureofthethermalcut-outreachesapproximately140½F(60½C)ormore.At thattemperature,
the contacts will close.The thermal cut-out opens automatically at approximately 113½F(45½C).
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.
K HOOD FAN MOTORTEST
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 motor does not turn, touch the FAN HI / LO button once (set hood fan motor power "HIGH")
and check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120
Volts appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not
appear, check the motor circuit.The resistance values of motor terminals are as follows:
Secondary
Interlock
Switch
Monitor
Switch
Screw Driver
Ohmmeter
Red/Brown Grey/White
BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
RELAY, SECONDARY INTERLOCK SWITCH, THIRD DOOR SWITCH, DOOR SENSING
SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.

19
DMOR200SS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
J HOODTHERMAL CUT-OUTTEST
6-PIN CONNECTOR
OF HOOD FAN MOTOR
L TOUCH CONTROL PANEL ASSEMBLYTEST
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, Con-
trol 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. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE
REMOVAL ".
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove two (2) screws holding the hood intake duct R to the oven cavity top plate and the base
plate R. And remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
1. Key Unit.
NOTE ;
1) Check key unit ribbon connection before replacement.
2) Reconnect all leads removed from components during testing.
3) Re-install the hood intake duct R with two (2) screws.
4) Re-install the outer case (cabinet).
5) Reconnect the power supply cord after the outer case is installed.
6) Run the oven and check all functions.
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) To discharge high voltage capacitor, wait for 60 seconds.
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.
33 W
11 W22 W
HOOD FAN
CAPACITOR
YLW
RED
BLU
BLK
1
2
3
WHT
4
5
BLU BLK
YLW RED
WHT
1 2
4 5
3

20
DMOR200SS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENTTEST
2. Control Unit.
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure M) 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.
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.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Reconnect all leads removed from components during testing.
5) Re-install the hood intake duct R.
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.
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the control panel assembly.
5. 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 contacts are closed when the door is closed and open when the door is open.If the door sensing
switch (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 unit responds by clearing with a beep the key unit is faulty and must be replaced.If the
control unit does 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.
6. Reconnect all leads removed from components during testing.
7. Re-install the control panel assembly.
8. Reconnect the power supply cord.
9. Run the oven and check all functions.
M KEY UNITTEST
KEY UNIT
G12 G11 G10 G9
G8 G7 G6 G5 G4 G3 G2 G1
HOT
WATER
KEEP
WARM
FRESH
ROOLS/
MUFFINS
REHEAT
BAKED
POTATOES
1POWER
LEVEL
2
4
7
DEFROST
SENSOR
COOK
BEVERAGE
HELP
POPCORN
FRESH
VEGETABLES
5
8
0
3
6
9
TIMER
CLOCK
LIGHT
HI / LO
FAN
STOP
CLEAR
START
MINUTE
ADD-A-
FROZEN
ROOLS/
MUFFINS
HI / LO