DMOS200
CDMOS200
VMOS200
CVMOS200
SERVICE MANUAL
S72M194DMOS2E
MICROWAVE OVEN
COOK
MODELS
(DMOS200 model shown)
DMOS200
CDMOS200
VMOS200
CVMOS200
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 ................... INSIDE FRONT COVER
BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................2
MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................3
FOREWORD AND WARNING ................................................................................................................................5
PRODUCT SPECIFICATIONS ...............................................................................................................................6
GENERAL INFORMATION ...................................................................................................................................6
OPERATION .........................................................................................................................................................8
TROUBLESHOOTING GUIDE ............................................................................................................................. 12
TEST PROCEDURE ............................................................................................................................................ 14
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................. 24
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 31
PICTORIAL DIAGRAM ........................................................................................................................................ 37
POWER UNIT CIRCUIT ....................................................................................................................................... 38
LSI UNIT CIRCUIT ............................................................................................................................................... 39
PRINTED WIRING BOARD ................................................................................................................................. 40
PARTS LIST ........................................................................................................................................................ 41
PACKING AND ACCESSORIES ......................................................................................................................... 45
Range Corporation
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
DMOS200
CDMOS200
VMOS200
CVMOS200
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other 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, check the magnetron, wave guide or transmission line, and cavity for proper alignment, 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 Measurement 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.
DANGER CAUTION
HIGH VOLTAGE
Do not energize a microwave oven with the outer case cabinet removed, because a microwave oven
generates High Voltage in the circuit.
If you intend to operate the oven employing the high frequency switching power converter circuit, you should
take special precautions to avoid an electrical shock hazard.
The high voltage transformer, high voltage capacitor and high voltage diode have energized high voltage
potential approx. 8 KV.
The aluminium heat sink is connected to the switching power transistor Collector pole, and has an energized
high voltage potential approx. 650V peak.
DO NOT ACCESS THE HIGH VOLTAGE TRANSFORMER, HIGH VOLTAGE CAPACITOR, HIGH
VOLTAGE DIODE AND HEAT SINK WHEN THE POWER SUPPLY IS CONNECTED TO AN ELECTRICAL
OUTLET.
CDMOS200
DMOS200
VMOS200
CVMOS200
Notes
1
CDMOS200
DMOS200
VMOS200
CVMOS200
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing 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.
Don't Touch !
Danger High Voltage
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.
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
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
After repairing
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 highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an
insulated screwdriver.
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.
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.
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)
carefully check that the water is now hot. If the water remains
cold carry out Before Servicing procedure and re-examine
the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.
2
CDMOS200
DMOS200
VMOS200
CVMOS200
MICROWAVE MEASUREMENT PROCEDURE (CANADA)
After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must
be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard
for microwave ovens as undermentioned.
A. Requirements:
Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with its service
controls and user controls adjusted to yield the maximum output, the leakage radiation, at all points at least 5 cm. from the
external surface of the oven, does not exceed:
1) 1.0mW/cm2 with the test load of 275 ± 15 ml of water at an initial temperature 20 ±5oC.
2) 5.0mW/cm2 when the outer enclosure is removed with a test load of 275 ± 15 ml of water at an initial temperature 20±5oC.
3) 5.0mW/cm2 without a test load.
B. 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:
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 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) Set the cooking control on Full Power Cooking Mode, Close the door 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 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) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and
that the secondary interlock switch does turn the oven OFF before any door movement.
C. Leakage test without enclosure:
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: Special attention should be given to avoid electrical shock because HIGH VOLTAGE is generated during this test
No Load test
1) Operate the oven without a load and measure the leakage by the same method as the above test procedure " Leakage
test with enclosure installed"
2. Make sure that the highest leakage should not exceed 5mW/cm2.
NOTE: After servicing, record data on service invoice and microwave leakage report.
3
CDMOS200
DMOS200
VMOS200
CVMOS200
MICROWAVE MEASUREMENT PROCEDURE (USA)
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at 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/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. 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:
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) Close the door 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-door leakage test (microwave measurement):
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) 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.
4
CDMOS200
DMOS200
VMOS200
CVMOS200
SERVICE MANUAL
VIKING RANGE CORPORATION
PRODUCT DESCRIPTION
MICROWAVE OVENS
DMOS200
CDMOS200
VMOS200
CVMOS200
GENERAL INFORMATION
FOREWORD
This Manual has been prepared to provide Viking Service Personnel with
Operation and Service Information for the Viking Microwave Ovens, DMOS200,
CDMOS200, VMOS200, CVMOS200 .
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.
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
WARNING
COMPONENT REPLACEMENT
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.
WIRING DIAGRAM
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
PARTS LIST
Certain initial parts are intentionally not grounded and present a risk of
electrical shock only during servicing. Service personnel - 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
111 Front St., Greenwood, MS 38930
Tel: (888) 845-4641
5
CDMOS200
DMOS200
VMOS200
CVMOS200
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 13.0 Amperes/1500Watts
60 Hertz
Single phase, 3 wire grounded
Power Output
1100 watts (IEC-705 TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions
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
Safety Standard
Yes
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.
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.
Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. 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.
Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact
a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding
6
CDMOS200
DMOS200
VMOS200
CVMOS200
adapter properly grounded and polarized. If the extension cord must be
used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape
over a countertop or table where it can be pulled on by children or tripped
over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
1. One touch door open button.
Push to open door.
2. Door latches.
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.
5. Oven lamp.
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.
9. Time display: Digital display, 99
minutes 99 seconds.
OVEN DIAGRAM
5
6
7
9
10
2
11
12
8
1
4
3
10. Turn table motor shaft
11. Wave guide cover.
12. Power supply cord
TOUCH CONTROL PANEL
COOK
NOTE:
The directed features are disabled
after one minute when the oven is
not in use. These features are
automatically enabled when the
door is opened and closed or the
STOP/ CLEAR pad is pressed.
(VMOS200 model shown)
7
CDMOS200
DMOS200
VMOS200
CVMOS200
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
the primary switch and primary and is mechanically
associated with the door so that it will function in the
following sequence.
1) When the door opens from the closed position, the primary
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.
The following is a description of component functions during
oven operation.
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"
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
If the primary switch and the secondary switch primary
contacts are closed when the door is opened, the monitor
switch contacts form a short circuit through the monitor fuse,
primary switch and secondary switch causing the monitor
fuse to blow.
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
When Variable Cooking Power is programmed, the 120 volts
A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2) which is operated by the
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)
RELAY
RY-1
RY-2
VARI-MODE
Power 10(P-HI)
(100% power)
Power 9(P-90)
(approx. 90% power)
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)
Power 1(P-10)
(approx. 10% power)
Power 0(P-0)
(0% power)
CONNECTED COMPONENTS
oven lamp/turntable motor/fan motor
power transformer
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. The filament winding voltage heats the magnetron filament
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 feedbox, 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. When the door is opened during a cook cycle, the monitor
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.
7. The monitor switch electrically monitors the operation of
Note:
8
ON TIME
32 sec.
OFF TIME
0 sec.
30 sec.
2 sec.
26 sec.
6 sec.
24 sec.
8 sec.
22 sec.
10 sec.
18 sec.
14 sec.
16 sec.
16 sec.
12 sec.
20 sec.
8 sec.
24 sec.
6 sec.
26 sec.
0 sec.
32 sec.
The ON/OFF time ratio does not correspond with the
percentage of microwave power, because approx. 2
seconds are needed for heating of the magnetron
filament.
CDMOS200
DMOS200
VMOS200
CVMOS200
2. The coil of shut-off relay (RY-1) is energized, the
turntable motor are turned on, but the power transformer
is not turned on.
3. After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwave energy is produced and first stage is started.
The 16 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.
SENSOR COOKING CONDITION
Using the SENSOR function, food is cooked without figuring
time, power level or quantity. When the oven senses enough
steam from the food, it relays the information to its
microprocessor which will calculate the remaining cooking
time and power level needed for best results. When the food
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.
The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI. An
example of how sensor works: (Potatoes)
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, the display switches over to the remaining cooking
time and the timer counts down to zero.
At this time, the door may be opened to stir, turn or
season food.
5. When the timer reaches zero, an audible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR pad,
the time of the day will reappear on the display and the
oven will revert to an OFF condition. When the timer
reaches zero, an audible signal sounds.
1. Potatoes at room temperature. Vapor is emitted very
slowly.
2.Heat Potatoes. Moisture and humidity is emitted very
rapidly. You can smell the aroma as it cooks.
3.Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Touch one of the SENSOR pads.
NOTE: The oven should not be operated on sensor
immediately after plugging in the unit. Wait two
minutes before cooking on SENSOR.
9
CDMOS200
DMOS200
VMOS200
CVMOS200
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
S E C ONDAR Y
S WIT C H
N
GR N
MAG NE T R ON
T E MP .
F US E
N.O.
FM
C AP AC IT OR 1.0µF
AC 2300V
DOOR
S E NS ING
S WIT C H
N.O.
C OM.
C AV IT Y
T E MP .
F US E
0.0033uF /AC 125V
LINE B Y P AS S C AP AC IT OR
C OM.
TTM
OL
C OM.
A1
B1
B2
A2
P OWE R
T R ANS F OR ME R
(R Y -2)
0.0033uF /AC 125V
120V AC
60 Hz
LINE B Y P AS S C AP AC IT OR
H
LINE C R OS S C AP AC IT OR
0.22uF /AC 250V
NOIS E S UP P R E S S ION C OIL
MONIT OR
F US E
P R IMAR Y
S WIT C H
N.O.
C OM.
(R Y -1)
N.C .
MONIT OR
S WIT C H
S E C ONDAR Y
INT E R LOC K
R E LAY
C OM.
H.V . R E C T IF IE R
N.O.
C ONT R OL UNIT
MAG NE T R ON
C OM.
NOIS E F ILT E 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 WIT C H
MAG NE T R ON
T E MP .
F US E
FM
C OM.
A1
B1
(R Y -2)
B2
(R Y -1)
P OWE R
T R ANS F OR ME R
N.C .
S E C ONDAR Y
INT E R LOC K
R E LAY
MONIT OR
S WIT C H
C OM.
N.O.
C ONT R OL UNIT
C OM.
NOIS E F ILT E R UNIT
N.O.
C AP AC IT OR 1.0µF
AC 2300V
DOOR
S E NS ING
S WIT C H
N.O.
C OM.
C AV IT Y
T E MP .
F US E
0.0033uF /AC 125V
LINE B Y P AS S C AP AC IT OR
TTM
OL
AH S E NS OR
GR N
C OM.
A2
0.0033uF /AC 125V
N
LINE B Y P AS S C AP AC IT OR
120V AC
60 Hz
LINE C R OS S C AP AC IT OR
0.22uF /AC 250V
H
NOIS E S UP P R E S S ION C OIL
MONIT OR
F US E
P R IMAR Y
S WIT C H
N.O.
C OM.
Figure O-2 Oven Schematic - Cooking Condition
10
H.V . R E C T IF IE R
MAG NE T R ON
CDMOS200
DMOS200
VMOS200
CVMOS200
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
The door is opened by pushing the open button on the control
panel, refer to the Figure D-1. When the open button is
pushed, the open button pushes up the switch lever, and then
the switch lever pushes up the latch head. The latch heads
are moved upward and released from latch hook. Now the
door will open.
open, the monitor fuse blows simultaneously with closing
of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE, TEST MONITOR SWITCH AND PRIMARY SWITCH FOR PROPER OPERATION.
(REFER TO CHAPTER "TEST PROCEDURE").
NOTE: MONITOR FUSE, AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
Latch Heads
TURNTABLE MOTOR
Door
Door Sensing
Switch
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.
Monitor Switch
COOLING FAN MOTOR
Secondary
Switch
Switch Lever
Primary
Switch
Figure D-1. Door Open Mechanism
PRIMARY SWITCH, SECONDARY SWITCH &
DOOR SENSING SWITCH
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
latch head on the door. When the door is opened, the switches
interrupt the power to all high voltage components, except the
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.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the
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 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 secondary interlock relay, primary switch and
secondary switch are in the OFF condition (contacts open)
due to their being normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch,
primary switch and secondary switch contacts close. (On
opening the door, each of these switches operate inversely.)
3. If the door is opened, primary switch and contacts fail to
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.
MONITOR FUSE
1. The monitor fuse blows when the contacts (COM-NO) of
the primary switch remain closed with the oven door open
and when the monitor switch closes.
2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric
shock or fire hazard.
CAVITY TEMPERATURE FUSE
The cavity temperature fuse located on the top of the oven
cavity, is designed to prevent damage to the oven by fire. If the
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
reached within the oven cavity, the cavity temperature fuse will
open at 302oF(150oC) causing the oven to shut down.
NOTE: This is fuse. It does not reset.
MAGNETRON TEMPERATURE FUSE
The magnetron temperature fuse located near the magnetron 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 magnetron temperature fuse
remains closed. However, when abnormally high temperatures
are reached within the magnetron, the magnetron temperature
fuse will open at 302oF(150oC) causing the oven to shut down.
NOTE: This is fuse. It does not reset.
11
CDMOS200
DMOS200
VMOS200
CVMOS200
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the primary switch, and monitor
switch, before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be
replaced. Use part FFS-BA016/KIT as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be
necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
12
CDMOS200
DMOS200
VMOS200
CVMOS200
CK = Check / RE = Replace
Home fuse or circuit breaker blows
when power cord is plugged into
wall receptacle
OFF
CONDITION
Monitor fuse blows when power
cord is plugged into wall receptacle.
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.
SENSOR
COOKING
CONDITION
AH sensor does not end during
sensor cooking condition. (Oven
does not shut off after a cup of water
is boiling by sensor cooking)
Oven stops at 16 sec. after starting
TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
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.
13
NOISE FILTER
M N
FOIL PATTERN ON PWB.
COMPU DEFROST
RELAY (RY1)
KEY UNIT
DIRTY OVEN CAVITY
LOW VOLTAGE
WRONG OPERATION
TOUCH CONTROL PANEL
TURNTABLE MOTOR
COOLING FAN MOTOR
OVEN LAMP OR SOCKET
MONITOR FUSE
MONITOR SWITCH
SECONDARY INTERLOCK SYSTEM
PRIMARY OR DOOR SENSING SWITCH
MAGNETRON TEMPERATURE FUSE
CAVITY TEMPERATURE FUSE
HIGH VOLTAGE CAPACITOR
H.V. RECTIFIER ASSEMBLY
POWER TRANSFORMER
PROBLEM
MAGNETRON
CONDITION
SHORT OR OPENED WIRING
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
RE RE A B C D E E F F G H RE RE CK I CK CKCK J K L
SHORT IN POWER CORD
TEST PROCEDURE
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check
across the magnetron filament leads should indicate less than 1 ohm.
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance
the magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition
(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
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 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 (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.
B
POWER TRANSFORMER TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
14
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
C
COMPONENT TEST
HIGH VOLTAGE RECTIFIER TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
2.
3.
4.
5.
6.
7.
8.
E
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAVITY TEMPERATURE FUSE TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless
the temperature of the cavity temperature fuse reaches approximately 302oF(150oC). An open cavity
temperature fuse indicates overheating of the oven, exchange the cavity temperature fuse 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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
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 the temperature of the magnetron temperature fuse reaches approximately 302oF(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.
15
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE.
F
PRIMARY AND SECONDARY SWITCH TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
SECONDARY 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. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (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,
turntable and oven light will be activated by RY1.
SECONDARY 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 Secondary 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.
G
MONITOR SWITCH TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Before performing this test, make sure that the primary switch is 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 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.
16
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all
Screw Driver
functions.
RED
WHT/WHT
Monitor
Switch
Ohmmeter
Primary Interlock Switch
H
Secondary Interlock Switch
BLOWN MONITOR FUSE TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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
MONITOR SWITCH FOR PROPER OPERATION.
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. 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
TOUCH CONTROL PANEL ASSEMBLY TEST
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)
2)
3)
4)
5)
6)
7)
8)
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Check Key unit ribbon connection before replacement.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
17
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE LETTER
COMPONENT TEST
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
The following symptoms indicate a defective control unit. Before replacing the control unit, perform the
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.
J
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..
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
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.
5. Reconnect all leads removed from components during testing.
18
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G1
Fresh
Vegetables
Ground
Meat
Entrees
G2
Rice
G3
G4
G5
G6
G7
G8
Beverages
1
2
3
4
5
G9
Preset
Recipes
Poultry
Vegetables
6
7
8
9
0
G10
START
Timer
Clock
Warm/
Hold
Snacks
Add-AMinute
G11
Power
Level
Lunch
Stop
Clear
15 Minute
Dinners
G12
Help
Baked
Potatoes
Popcorn
G13
TOUCH START
Fish
Seafood
BREAKFAST
Defrost
Reheat
G14
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
RY1
RY2
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
Approx. 24.0V D.C.
Approx. 23.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
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.
L
COMPU DEFROST TEST
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
LEVEL
TIME
LEVEL
TIME
0.5lb
70%
30sec.
40%
15sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
19
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
M
COMPONENT TEST
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
1
2
OCCURRENCE
CAUSE OR CORRECTION
Only pattern at "a" is broken.
Pattern at "a" and "b" are broken.
VRS1
T1
AC
1
VH
2
CN - A
d
a
b
XA
(J1)
c
OMIF
D U
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
(check the primary coil resistance which
is approximately 210 ohm ± 15%). If any
abnormal condition is detected, replace
the defective parts.
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
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. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs
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
8)
9)
10)
11)
12)
13)
14)
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between
Pin No. 1 of the 2-pin connector (A) and the Check supply voltage and oven power cord.
common terminal of the relay RY1.
2
The rated AC voltage is present at primary
side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
20
TEST PROCEDURES
PROCEDURE
LETTER
N
CDMOS200
DMOS200
VMOS200
CVMOS200
COMPONENT TEST
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.
o
o
2) Room temperature should not exceed 95 F(35 C).
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) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit
adequate ventilation, be sure to install so as not to block these vents. There should be some space
for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
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, the oven is in the sensor cooking condition and "TEST", "SENSOR" and "COOK" will appear
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. The display will start to count down the remaining cooking time, and the oven will turn off automatically
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.
21
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) Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1 Touch Timer/Clock pad once, the Power Level pad twice, the Start pad once and the number pad
once.
9-2 The control panel is in the sensor cooking operation.
9-3 After approximately 25 seconds, push plunger of select switch for more than 3 seconds.
This condition is same as judgement by AH sensor.
9-4 After approximately 3 seconds, the display shows "xx.xx" which is remaining cooking time, and
the display count down.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10)Disconnect the power supply cord, and then remove outer case.
(11)Open the door and block it open.
(12)Discharge high voltage capacitor.
(13)Reconnect the sensor connector that is mounted to control panel.
(14)Carry out the necessary repair.
(15)Reconnect all leads removed from components during testing and repairing.
(16)Re-install the outer case (cabinet)
(17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all
functions
(18)Carry out the "water load cooking test" again and ensure that the oven work properly.
22
CDMOS200
DMOS200
VMOS200
CVMOS200
TEST PROCEDURES
PROCEDURE
LETTER
N
COMPONENT TEST
NOISE FILTER TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the leads to the primary of the power transformer.
Using an ohm-meter, check between the terminals as described in the following table:
NOISE FILTER UNIT
MONITOR
FUSE
NOISE SUPPRESSION COIL
LINE CROSS CAPACITOR
0.22uF/ AC 250V
LINE BYPASS CAPACITOR
LINE BYPASS CAPACITOR
0.0033uF/ AC 125V
0.0033uF/ AC 125V
GRY
MEASURING POINT
RED
INDICATION OF OHM-METER
Between N and H
Between terminal N and GRY
Open Circuit
Short Circuit
Between terminal H and RED
Short Circuit
If incorrect readings are obtained, replace the noise filter.
6.
7.
8.
9.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
23
CDMOS200
DMOS200
VMOS200
CVMOS200
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit
and LSI Unit).
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
The principal functions of these units and the signals communicated 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
commercial frequency.
Key Unit
The key unit is composed of a matrix, signals generated in the
LSI are sent to the key unit through P00-P07.
When a key pad is touched, a signal is completed through the
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.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and back
light circuit.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD10- LD15).
9) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
1) ACL
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
2) Indicator Circuit
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
Voltage
VC
-5V
Application
LSI(IC1)
24
CDMOS200
DMOS200
VMOS200
CVMOS200
LSI(IXA098DR)
The I/O signal of the LSI(IXA098DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
1
COM5
OUT
Common data signal : COM11.
Connected to LCD signal COM11.
2
COM4
OUT
Common data signal : COM12.
Connected to LCD signal COM12.
3
COM3
OUT
Common data signal : COM13.
Connected to LCD signal COM13.
4
COM2
OUT
Common data signal : COM14.
Connected to LCD signal COM14.
5
COM1
OUT
Common data signal : COM15.
Connected to LCD signal COM15.
6
COM0
OUT
Common data signal : COM16.
Connected to LCD signal COM16.
7-10
VL1-VL4
IN
Power source voltage input terminal.
Standard voltage for LCD.
11
VL5
IN
Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
12-14
C3-C1
IN
Terminal not used.
15
VLIN
IN
Terminal not used.
16
VREG
Terminal not used.
17
NC
OUT
_
18
VSS
IN
19-21
P27-P25
OUT
22-26
P24-P20
IN
Used for initial balancing of the bridge circuit (absolute humidity sensor).
27
P47
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
P46
OUT
Terminal not used.
29
P45
OUT
Oven lamp, fan motor and turntable motor driving signal.
16.7 msec.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Terminal not used.
Power source voltage : -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
Terminal not used.
H : GND
L : -5V
During cooking
30
P44
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cooking 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.
OFF
100 %
ON
OFF
70 %
H : GND
24 sec.
ON
L : -5V
OFF
8 sec.
H : GND
L : -5V
(ON and OFF times for other power level.)
31
P43
OUT
Terminal not used.
32
CNTR0
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
0.1 sec.
H : GND
A
2.0 sec.
L : -5V
H : GND
B
L : -5V
33
P41
OUT
Terminal not used.
25
CDMOS200
DMOS200
VMOS200
CVMOS200
Pin No.
Signal
I/O
34
INT0
IN
Description
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
P07
OUT
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.
36
P06
OUT
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.
37
P05
OUT
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.
38
P04
OUT
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.
39
P03
OUT
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.
40
P02
OUT
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.
41
P01
OUT
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.
42
P00
OUT
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.
43
P17
OUT
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.
44
P16
IN
Signal similar to P17.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P16.
45
P15
IN
Signal similar to P17.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P15.
46
P14
IN
Signal similar to P17.
When either G12 line on key matrix is touched, a corresponding signal will be input into
P14.
47
AIN7
IN
Signal similar to P17.
When either G13 line on key matrix is touched, a corresponding signal will be input into
AIN7.
48
AIN6
IN
Input terminal to judge the model.
The signal out of P02 will be input into AIN6 through G6 line on key matrix. The LSI will
judge the model by this signal.
26
CDMOS200
DMOS200
VMOS200
CVMOS200
Pin No.
Signal
I/O
Description
49
AIN5
IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/
D converter built into the LSI.
50
AIN4
IN
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built
into the LSI.
51
RESET
IN
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
NC
_
Terminal not used.
53
XCOUT
OUT
Terminal not used.
54
XCIN
Connected to VC.
55
NC
IN
_
56
VCC
IN
Power source voltage: GND(0V).
The power source voltage to drive LSI is input to VCC terminal.
57
OSCSEL
IN
Connected to VC(-5V).
58
XOUT
OUT
59
VSS
IN
60
NC
61
XIN
IN
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.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
67
COM8
OUT
Common data signal : COM8. Connected to LCD signal COM8.
68
COM9
OUT
Common data signal : COM7. Connected to LCD signal COM7.
69
COM10
OUT
Common data signal : COM6. Connected to LCD signal COM6.
70
COM11
OUT
Common data signal : COM5. Connected to LCD signal COM5.
71
COM12
OUT
Common data signal : COM4. Connected to LCD signal COM4.
72
COM13
OUT
Common data signal : COM3. Connected to LCD signal COM3.
73
COM14
OUT
Common data signal : COM2. Connected to LCD signal COM2.
74
COM15
OUT
Common data signal : COM1. Connected to LCD signal COM1.
75-102
SEG67-SEG40
OUT
Terminal not used.
Terminal not used.
Internal clock oscillation output.
Output to control oscillation input of XIN.
Power source voltage: -5.0V.
The power source voltage to the LSI is input to VSS terminal. Connected to VC.
Terminal not used.
27
CDMOS200
DMOS200
VMOS200
CVMOS200
103-142
SEG39-SEG0
OUT
Segment data signal.
Connected to LCD.
The relation between signals and LCD are as follows:
LSI signal (Pin No.)
LCD segment
LSI signal (Pin No.)
LCD segment
SEG 39 (103) .......................... SEG 1
SEG 19 (123) ......................... SEG 21
SEG 38 (104) .......................... SEG 2
SEG 18 (124) ......................... SEG 22
SEG 37 (105) .......................... SEG 3
SEG 17 (125) ......................... SEG 23
SEG 36 (106) .......................... SEG 4
SEG 16 (126) ......................... SEG 24
SEG 35 (107) .......................... SEG 5
SEG 15 (127) ......................... SEG 25
SEG 34 (108) .......................... SEG 6
SEG 14 (128) ......................... SEG 26
SEG 33 (109) .......................... SEG 7
SEG 13 (129) ......................... SEG 27
SEG 32 (110)
SEG 31 (111)
SEG 30 (112)
SEG 29 (113)
SEG 28 (114)
SEG 27 (115)
SEG 26 (116)
SEG 25 (117)
SEG 24 (118)
SEG 23 (119)
SEG 22 (120)
SEG 21 (121)
SEG 20 (122)
.......................... SEG 8
.......................... SEG 9
.......................... SEG 10
.......................... SEG 11
.......................... SEG 12
.......................... SEG 13
.......................... SEG 14
.......................... SEG 15
.......................... SEG 16
.......................... SEG 17
.......................... SEG 18
.......................... SEG 19
.......................... SEG 20
SEG 12 (130)
SEG 11 (131)
SEG 10 (132)
SEG 9 (133)
SEG 8 (134)
SEG 7 (135)
SEG 6 (136)
SEG 5 (137)
SEG 4 (138)
SEG 3 (139)
SEG 2 (140)
SEG 1 (141)
SEG 0 (142)
......................... SEG 28
......................... SEG 29
......................... SEG 30
......................... SEG 31
......................... SEG 32
......................... SEG 33
......................... SEG 34
......................... SEG 35
......................... SEG 36
......................... SEG 37
......................... SEG 38
......................... SEG 39
......................... SEG 40
143
COM7
OUT
Common data signal : COM9. Connected to LCD signal COM9.
144
COM6
OUT
Common data signal : COM10.
28
Connected to LCD signal COM10.
CDMOS200
DMOS200
VMOS200
CVMOS200
ABSOLUTE HUMIDITY SENSOR CIRCUIT
With this voltage given, the switches SW1 to SW5 in the
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
humidity sensor and AN0 terminal of the LSI. The voltage
of AN1 terminal will indicat about 16 seconds about -2.50
V. This initial balancing is set up about 16 seconds after
the unit is put in the Sensor Cooking mode. As the sensor
cooking proceeds, the food is heated to generate moisture
by which the resistance balance of the bridge circuit is
deviated to increase the voltage available at AN1 terminal
of the LSI.
Then the LSI observes that the voltage at AN1 terminal
and compares it with its initial value, and when the
comparison rate reaches the preset value (fixed for each
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
unit has been put in the Sensor Cooking mode, if it is not
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.
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors as
shown in the illustration. One thermistor is housed in the
closed vessel filled with dry air while another in the open
vessel. Each sensor is provided with the protective cover
made of metal mesh to be protected from the external
airflow.
ventilation opening for sensing
R3
S : Thermistor
open vessel
C : Thermistor
closed vessel
620k
26
R99
300k
25
R100
150k
24
R101
75k
23
R102
37.4k
22
R97
S
Absolute humidity
(g/m 2 )
F-2
R90
(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.
R91
3.32k R92
1.8k
VA : -15V
29
8 7 6 5
1 2 3 4
R94
R95
10k
47k
R93
360k
D91
VA : -15V
VC : -5V
IC2
P21
P22
P23
P24
D90
SW2
SW3
SW4
SW5
AIN4
0.01uF
F-1
C
R96
F-3
3.57k
0.01uF
50
0.015uF
47k
SW1
P20
LSI
(IC1)
C92
R2
Operational
amplifier
Output
voltage
+
Absolute humidity vs,
output voltage characteristic
R98
C91
S
R1
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
Output voltage
C
1) Absolute humidity sensor circuit
C93
(2) Operational Principle of Absolute Humidity Sensor
The figure below shows the basic structure of an 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
operational amplifier.
0.1
uF
Sensing part
(Closed vessel)
C90
Thermistors
Sensing part
(Open vessel)
49
AIN5
CDMOS200
DMOS200
VMOS200
CVMOS200
TOUCH CONTROL PANEL SERVICING
1. Precautions for Handling Electronic Components
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
extremely high impedance at its input and output terminals.
For this reason, it is easily influenced by the surrounding
high voltage power source, static electricity charge in
clothes, etc. and sometimes it is not fully protected by the
built-in protection circuit.
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
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
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
with a jumper, which activates an operational state that is
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:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which activates
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 sensorrelated controls of the touch control panel by using the
dummy resistor(s).
approx. 1M ohm
2. Shapes of Electronic Components
2. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform the
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:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
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.
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).
3. Servicing Tools
Tools required to service the touch control panel assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a grounding
terminal.)
2) Oscilloscope: Single beam, frequency range: DC-10MHz
type or more advanced model.
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) After aluminium foil is removed, be careful that abnormal
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) Be sure to use specified components where high precision
is required.
30
CDMOS200
DMOS200
VMOS200
CVMOS200
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE:
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:
Avoid possible exposure to microwave energy. Please follow the instructions below before operating
the oven.
1. Disconnect the power supply cord.
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.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
1.
2.
3.
4.
5.
6.
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal is damaged.
The door is bent or warped.
There are defective parts in the door interlock system.
There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
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.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
WARNING FOR WIRING
To prevent an electric shock, take the following precautions.
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:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer and
Oven cavity.
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
and make sure that the wire leads do not come off even
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
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.
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.
4. Remove the remaining two (2) screws from rear and four
(4) screws along the right side of outer case.
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.
31
CDMOS200
DMOS200
VMOS200
CVMOS200
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
POWER TRANSFORMER REMOVAL
Re-install
1. Rest transformer on the bottom plate with its primary
terminals toward the oven face 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.
1. Disconnect the power supply cord and then remove outer
case.
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.
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.
9. Remove capacitor holder. Capacitor is now free.
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 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.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
MAGNETRON REMOVAL
Removal
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 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
antenna is not hit by any metal object around the antenna.
9. Now, the magnetron is free.
Re-install
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. Hold the chassis support to the oven cavity front plate and
the magnetron with the two (2) screws.
4. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM" on page 33.
5. Re-install outer case and check that the oven is operating
properly.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY
32
CDMOS200
DMOS200
VMOS200
CVMOS200
OVEN LAMP AND LAMP SOCKET REMOVAL
1.
2.
3.
4.
5.
Disconnect the power supply cord and remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Remove the oven lamp from the oven lamp socket.
Pull the wire leads from the oven lamp socket by 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.
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.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
Figure C-1. Oven lamp socket
Terminal
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
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. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
Positive lock¨
connector
1
Push
Lever
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS, CONNECT 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. 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 wire leads from panel components.
5. Remove the one (1) screw holding the control panel
assembly to the oven cavity front plate.
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
NOTE: 1. Before attaching a new key unit, wipe off 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, adjust the upper edge and right edge of the
key unit to the correct position of control panel
frame.
LSI UNIT
NOTE: Handle the LSI unit carefully so that there is no
excessive force applied to the ribbon connection.
Liquid Crystal
Display (LCD)
Printed wiring board
of LSI unit
Ribbon cable
LSI unit
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Remove turntable and turntable support from oven cavity.
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
areas flat. No sharp edges must be evident after removal
of the turntable motor cover.
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. After replacement use the one (1) screw to fit the turntable
motor cover.
33
CDMOS200
DMOS200
VMOS200
CVMOS200
COOLING FAN MOTOR REMOVAL
REMOVAL
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 wire leads from the fan motor.
5. Remove the two (2) screws holding the fan motor to the
oven cavity back plate.
6. Remove the fan blade from the fan motor shaft according
to the following procedure.
7. Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that no metal pieces enter the gap between
the rotor and the stator of the fan motor because the
rotor is easily shaven by pliers and metal pieces may
be produced.
* 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.
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.
CAUTION:
* Do not reuse the removed fan blade because the hole
(for shaft) may be larger than normal.
INSTALLATION
1. Install the fan blade to the fan motor shaft according to the
following procedure.
2. Hold the center of the bracket which supports the shaft of
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
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
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.
* Make sure that the axis of the shaft is not slanted.
5. Install the fan motor to the the oven cavity back plate with
the two (2) screws.
6. Connect the wire leads to the fan motor, referring to the
pictorial diagram.
Coil
Groove joint pliers
Shaft
Stator
Gap
Bracket
Shaft
Axis
Rotor
Stator
These are the positions
that should be pinched
with pliers
Table
Center of
bracket
Rotor
Rear View
Rear View
Side View
Side View
AH SENSOR REPLACEMENT
REMOVAL
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
RE-INSTALL
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.
DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH REMOVAL
1.
2.
3.
4.
5.
6.
7.
8. Switch is now free.
At this time switch lever will be free, do not lose it.
Re-install
1. Re-install each switch in its place. The secondary interlock/
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.
Disconnect the power supply cord and remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect wire leads from the switches.
Remove two (2) screws holding latch hook to oven flange.
Remove latch hook assembly from oven flange.
Push outward on the two (2) retaining tabs holding switch
in place.
34
CDMOS200
DMOS200
VMOS200
CVMOS200
3. Secure latch hook (with two (2) mounting screws) to oven
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.
DOOR SENSING SWITCH/PRIMARY SWITCH/SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT
1. Disconnect the power supply cord, and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
If the door sensing switch, primary switch, secondary switch
and monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
4. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
5. With door closed, adjust latch hook by moving it back and
forth, and up and down. In and out play of the door allowed
by the upper and lower position of the latch hook should
be less than 0.5mm. The vertical position of the latch hook
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
should be adjusted so that the plunger of the monitor
switch is pressed with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
hook, pushing and pulling upper portion of door toward the
oven face. Both results (play in the door) should be less
than 0.5mm.
2. The door sensing switch, primary switch and secondary
switch interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Latch Heads
Door
Door Sensing
Switch
Monitor Switch
Secondary
Switch
Switch Lever
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in
the latched position. First check upper position of latch
hook, pushing and pulling upper portion of door toward the
oven face. Then check lower portion of the latch
Primary
Switch
Figure C-3. Latch Switch Adjustments
DOOR REPLACEMENT
REMOVAL
1. Disconnect the power supply cord.
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.
5. Release choke cover from door panel.
6. Now choke cover 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, door panel with door frame is free from oven cavity.
9. Release the door panel from twelve (12) tabs of door
frame.
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.
15.Now, latch head and latch spring are free.
16.Remove door screen from door frame
17.Now, door frame is free.
RE-INSTALL
1. Re-install door screen to door frame.
2. Re-install the latch spring to the latch head. Re-install the
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. Put sealer film on door panel. Refer to “Sealer Film” about
how to handle new one.
5. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
Choke Cover
Door Frame
Putty Knife
Figure C-4. Door Disassembly
35
CDMOS200
DMOS200
VMOS200
CVMOS200
SEALER FILM
6. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(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
approved microwave survey meter. (Refer to Microwave
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. This function does not require that door be airtight, moisture (condensation)-tight or light-tight.
Therefore, occasional appearance of moisture, 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.
Installation
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
Figure C-6. Sealer film
Figure C-5. Door Replacement
36
1
2
3
37
4
B LK
C N-A
C OM.
C OM
N.O.
R Y2
T1
GR Y
C N-B
3
2
1
C N-F
1
BLUE MAR K
OR G
OV E N LAMP
AND S OC K E T
NOT E :
Hot (OR G ) wire mus t be
connected to the terminal
with blue mark on the oven
light s ocket.
WHT
5
RED
OR G
P R IMAR Y
S WIT C H
C OM.
NO
Y LW
OR G
B LK
B LK
C OM.
NO
BR N
S E C ONDAR Y
S WIT C H
C OM.
GR Y
B LK
J S T V HR -2N
Figure S-1. Pictorial Diagram
N.C .
RED
B LK
GR Y
BR N
RED
Y LW
WHT
B LK
T UR NT AB LE
MOT OR
WHT
C N-B
1 P NK
2 GR N
GR N
GR N
OR G
C OM.
DOOR
S E NS ING
S WIT C H
MAG NE T R ON
P OWE R
T R ANS F OR ME R
H.V . R E C T IF IE R
HIG H VOLT AG E
WIR E A
N.O.
HIG H
V OLT AG E
C AP AC IT OR
HIG H V OLT AG E C OMP ONE NT S
F AN MOT OR
WHT
NOT E :
T he neutral (WHT /G R Y ) wire mus t
be connected to the terminal with
"N" mark on the power s upply
cord.
P OWE R S UP P LY
C OR D 120V 60Hz
NOT E :
T he grounding conductor of
the power s upply cord has
been grounded by power
s upply cord fixing s crew.
T he s crew mus t always be
kept tight.
to Oven cavity
P NK
GR N
4
(P OWE R UNIT )
N.O.
R Y1
B LU
C N-C
C N-C
B LK
C AV IT Y T E MP . F US E
N
3
PR I
INT E R LOC K
R E LAY
(C P U UNI
11
IC 1
RED
MAG NE T R ON T E MP . F US E
E
1
15
RED
GR Y
H
C
B LK
WHT
B
B LK
WHT
AH S E NS OR
A
C ONT R OL UNIT
RED
G
2
C N-G
1
MONIT OR
S WIT C H
D
1 B LK
F
C N-F
1 B LK
2 RED
3 WHT
CDMOS200
DMOS200
VMOS200
CVMOS200
5
6
A
B
C
H
6
D
E
F
G
H
GR Y
CDMOS200
DMOS200
VMOS200
CVMOS200
2
1
4
3
6
5
A
A
B
B
C
C
C N-C
12P IN LE AD
WIR E HAR NE S S
Q2 2S B 1238
R 4 27
C 10
LE D
C 2
G ND
C 3
VC
C 1
VA
C 4
INT
C 9
VR
C 5
B UZZE R
C 6
OV E N LAMP
T UR NT AB LE
MOT OR
F AN MOT OR
C 7
MIC R O
C 8
NC
B 2
C 11
NC
B 2
C 12
DOOR
S E NS ING
S WIT C H
1S S 270A
+
–
+
–
R 3 510 1/2w
(J 1)
Q1 2S B 1238
R 2 680 1/2w
c
E
D
C 4 10µ/35v
D4
D2
1S S 270A
C 3 0.1µ/50v
6
b
D1
ZD1
HZ16-1
3
d
a
D3
R 5 4.7k
R 1 2.4k
D
4
C 2 1000µ/35v
AC
A2
1
10G 471K
A1
VR S 1
C N-A
D6
C 1 0.1µ/50v
D1-D4
11E S 1
T1
D5
E
S P 1 P K M22E P T
Q3 K R C 243M
R 6 3.3k
+
–
F
NO
D8
MIC R O
C OM
DOOR
S E NS ING
S WIT C H
1S S 270A
R Y2
C 5 10µ/35v
C OM
1S S 270A
AC
R Y1
NO
D7
OV E N LAMP
T UR NT AB LE
MOT OR
F AN MOT OR
F
G
G
H
H
Figure S-2 Power Unit Circuit
1
2
4
3
38
5
6
GND
INT
C-2
C-4
C-3
C-10
CN-C
+
–
LD10 LD11 LD12 LD13
C11 0.1µ/50v
D20 MA152WA
Q20
DTA143EAK
P45
CNTRO
C20
0.1µ/50v
Q30
DTA143EAK
P44
R91
3.32kD
P05
R90
330 1w
P06
Q21
DTA123JKA
P07
Q11
DTA143EAK
P21
P03
IC-2
BA4558
R93 360kF
P23
P02
P24
P01
G7
P22
R92 1.8kF
P20
P04
G6
P00
G8
R94
4.7k
R97
15k
R41 15k
G9
G10
G12
G11
G13
D90
MA152WA
C92
0.01µ/25v
C93
0.01µ/25v
C16
0.1µ/50v
C17
0.1µ/50v
C15
0.1µ/50v
C18
0.1µ/50v
VL4
VL3
VL2
VL1
1
G
SENSOR DEFROST TURNTABLE OFF COOK HELP
144
37
COM5
COM4
COM3
COM2
COM1
COM0
VL1
VL2
VL3
VL4
VL5
C3
C2
C1
VLIN
VREG
NC
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P47
P46
P45
P44
P43
CNTR0
P41
INT0
P07
P06
36
R69 15k P16
R68 15k P17
R71 15k P14
R70 15k P15
R73 15k AIN6
R72 15k AIN7
IC-1
IXA098DR
109
108
72
73
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
SEG61
SEG62
SEG63
SEG64
SEG65
SEG66
SEG67
COM15
COM14
CF1
CST4.00MGW
SEG39
VC
LED
C-9
C-1
VR
VA
C-6
C-7
C-5
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
BUZZERR
MICRO
C-8
C-11
C-12
F-2
F-1
F-3
CN-F
G5
Add-AMinute
0
5
15 Minute
Dinners
9
4
Snacks
8
3
Warm/
Hold
Popcorn
Stop
Clear
Reheat
Lunch
Baked
Potatoes
COM15
C10 47µ/16v
: IF NOT SPECIFIED 1/10W ± 5%
G4
7
2
Timer
Clock
Power
Level
Help
39
SEG34
6
5
4
COM5
AIN3 (J16) 4.7K
F
COM6
COM7
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
P05
P04
P03
P02
P01
P00
P17
P16
P15
P14
AIN7
AIN6
AIN5
AIN4
RESET
NC
XCOUT
XCIN
NC
VCC
OSCSEL
XOUT
VSS
NC
XIN
NC
AIN3
AIN2
AIN1
AIN0
COM8
COM9
COM10
COM11
COM12
COM13
G
NC
DOOR
SENSING
SWITCH
NC
AH SENSOR
NOTE
G3
BREAKFAST
TOUCH START
START
6
G2
G1
Fish
Seafood
Preset
Recipes
1
Rice
Beverages
Fresh
Vegetables
Poultry
Vegetables
Ground
Meat
Entrees
Defrost
R79 270k
(J14)
(J17)
CN-G
COM0
R78 270k
AIN2
C61 330p/50v
R15
4.7k
R75 270k
(J12)
(J15) 4.7k
C40 0.01µ/25v
C60 330p/50v
R18 R17 R16
4.7k 4.7k 4.7k
R74 270k
(J10)
AIN1
R95
15k
C14 0.01µ/25v
R40
4.7k
R19
4.7k
C65 330p/50v
AIN0
(J13) 4.7k
C62 330p/50v
(J11) 4.7k
AIN5
AIN4
G14
R76 270k
H
H
E
C64 330p/50v
D
D
Q10
2SA1037AK
R11 15k
R67 15k
R102
37.4kF
R66 15k
C91 0.1µ/50v
R10 1k
ZD10
UDZ4.3B
8
7
6
5
1
2
3
4
R101
75kF
R65 15k
R96
3.57kD
R98
620k
C13 0.01µ/25v
R100
150kF
R12 15k
R99
300k
R64 15k
3
2
1
R62 15k
C
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
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
F
C63 330p/50v
E
R63 15k
C
C12
0.1µ/50v
C90 0.1µ/50v
R61 15k
R60 15k
B
LD15 LD14
B
A
A
6
5
4
3
2
1
Figure S-3 CPU Unit Circuit
CDMOS200
DMOS200
VMOS200
CVMOS200
R77 270k
COM8
CDMOS200
DMOS200
VMOS200
CVMOS200
2
1
4
3
6
5
A
A
B
B
(CN - C)
1
R1
B
Q3
SP1
D7
VRB
C
2
7
8
9
U
1
SH - A
4
E
1 2
D5
D6
SH - B
B
Q2
C5
5
6
ZD1
R4
R5
R2
D8 R6
D
3
2
E Q1 B
C
CN - C
1
R3
12
WH - 1
C4
1
9
E
C3
CN - B
D
D
RY2
C2
S
D4
D2
D1
VRS1
T1
AC
1
VH
D3
E
F
E
P
11
C1
10
2
XA
CN - A
(J1)
F
F
D9
RY1
OMIF
D U
AC
G
(CN - D)
(D10)
OL FM
TTM
RY3
G
H
H
Figure S-5 Printed Wiring Board of Power Unit
1
2
4
3
40
5
6
CDMOS200
DMOS200
VMOS200
CVMOS200
PARTS LIST
∆” may cause undue microwave exposure.
Note: The parts marked “∆
The parts marked “*” are used in voltage more than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q'TY CODE
ELECTRIC PARTS
∆
∆
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
PM100005
PM100018
PM100022
PM100024
PM100004
PM100019
PM100016
PM100017
PM100026
PM100023
PM100025
PM100002
PM100003
PM100008
High voltage capacitor
High voltage rectifier assembly
Oven lamp socket
Oven lamp
Fan motor
Monitor switch (V-16G-2C25) and fuse assembly (20A 250V AC)
Secondary interlock switch and door sensing switch (V-5230Q)
Magnetron temperature fuse 150½C
Cavity temperature fuse 150½C
Magnetron
Turntable motor
Power transformer
Power supply cord
AH sensor
Noise filter
2- 1
2- 2
2- 3
PM110009
PM110010
PM110007
Base plate
Foot
Outer case cabinet
333333333-
PM100001
PM100007
PM100006
PM110014
PM110013
PM120008
PM100015
PM100014
PM120026
Control unit
Control panel frame with key unit (DMOS200/CDMOS200)
Control panel frame with key unit (VMOS200/CVMOS200)
Open button (DMOS200/CDMOS200)
Open button (VMOS200/CVMOS200)
Open button spring
LED sheet
LCD holder
Screw; 3mm x 10mm
PM100013
PM110017
PM120014
PM120006
PM120013
PM110018
PM120011
------------PM110020
PM120015
PM120012
PM120010
PM120009
PM110016
H.V. Capacitor band
Chassis support
Latch hook
Switch lever
Magnetron duct
Fan blade
Fan duct
Oven cavity
(Not a replaceable part)
Waveguide cover
Turntable motor packing
Sensor duct
Cushion
Cushion
Noise filter angle
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
AQ
AM
AE
AE
AR
AF
AE
AE
AF
BE
AK
BA
AM
AW
AW
1
4
1
BC
AB
BC
1
1
1
1
1
1
1
1
3
AX
AX
AE
AE
AA
AA
AA
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AB
AE
AF
AD
AG
AC
AC
-AV
AA
AG
AC
AA
AE
CABINET PARTS
CONTROL PANEL PARTS
1
2
2
3
3
4
5
6
7
OVEN PARTS
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
41
CDMOS200
DMOS200
VMOS200
CVMOS200
REF. NO.
PART NO.
DESCRIPTION
Q'TY
DOOR PARTS
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
PM110004
PM110001
PM110002
PM120001
PM120007
PM110005
PM120016
PM110008
PM120032
PM120033
PM120026
Door frame assembly
Door frame assembly
Door frame assembly
Door frame assembly
Latch head
Latch spring
Door panel
Sealer film
Choke cover
Door cushion
Door screws
Door screws
(DMOS200)
(CDMOS200)
(VMOS200)
(CVMOS200)
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
Turntable support
Turntable tray
Monitor caution label
DHHS/Screw caution label
Operation manual
High voltage wire A
Recipe card
Menu label
DHHS/GRD/BIK caution
Health Canada label
User caution label
BIK height caution label
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
Special
Screw :
Screw
Screw :
Screw :
Special
Screw :
Screw :
Special
1
1
1
1
1
1
1
1
1
2
3
6
AK
AK
AK
AK
AE
AB
AX
AD
AG
AC
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AF
AU
AN
AT
AA
AB
AF
AD
AC
MISCELLANEOUS
AB
AB
AB
AB
SCREWS,NUTS AND WASHERS
screw
screw
4mm x 12mm
4mm x
3mm x
screw
4mm x
4mm x
screw
12mm
8mm
8mm
12mm
(Torx tamper proof screw)
42
5
3
1
1
12
2
2
3
4
2
AA
AA
AA
AA
AA
AA
AA
AA
AA
CDMOS200
DMOS200
VMOS200
CVMOS200
2
1
4
3
6
5
OVEN AND CABINET PARTS
7-10
A
A
7-10
7-7
2-3
B
B
7-9
4-7
7-7
6-12
7-6
7-2
C
1-14
6-11
1-9
6-6
C
1-5
7-6
7-5
6-14
4-6
7-3
4-11
7-9
7-6
1-13
7-8
4-8
D
1-6
1-15
4-14
1-8
7-8
D
4-2
4-9
7-4
1-10
6-10
6-5
E
1-3
7-2
7-2
6-4
7-5
4-10
1-11
7-6
F
4-3
1-7
4-5
7-1
1-7
1-12
1-6
4-13
F
1-7
2-1
6-3
E
1-4
7-1
4-4
4-1
1-1
1-2
G
G
7-5
2-2
2-2
2-2
7-5
2-2
7-5
4-12
H
H
1
2
4
3
43
5
6
CDMOS200
DMOS200
VMOS200
CVMOS200
2
1
4
3
CONTROL PANEL PARTS
5
6
3-1
A
A
3-2
3-7
3-7
6-13
3-6
B
B
3-5
3-3
C
C
3-4
5-4
D
D
5-7
5-2
DOOR PARTS
5-5
5-3
E
E
5-7
5-5
F
F
5-1-1
MISCELLANEOUS
5-1-2
5-6
G
G
6-1
5-1
6-2
H
H
6-8
1
2
4
3
44
Actual wire harness may be different from illustration.
5
6
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
TO
IN
E
TH
6-3 TURNTABLE SUPPORT
PACKING CASE
Non-replaceable items.
45
ITY
AV
C
EN
OV
BOTTOM PAD ASSEMBLY
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
46