Viking DMOC205SS, VMOC205SS User Manual

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SERVICE MANUAL

MICROWAVE OVEN

DMOC205SS VMOC205SS

S14M227DMO205

MODELS

DMOC205SS VMOC205SS

(VMOC205SS model shown)

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 (Canada) ...................................................................................... 3

MICROWAVE MEASUREMENT PROCEDURE (USA) .......................................................................................... 4

FOREWORD AND WARNING ................................................................................................................................5

PRODUCT SPECIFICATIONS ............................................................................................................................... 6

GENERAL INFORMATION ...................................................................................................................................6

OPERATION .........................................................................................................................................................8

TROUBLESHOOTING GUIDE ............................................................................................................................. 14

TEST PROCEDURE ............................................................................................................................................16

TOUCH CONTROL PANEL ASSEMBLY .............................................................................................................23

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 29

PICTORIAL DIAGRAM ........................................................................................................................................ 36

POWER UNIT CIRCUIT ....................................................................................................................................... 37

PRINTED WIRING BOARD ................................................................................................................................. 38

PARTS LIST ........................................................................................................................................................39

PACKING AND ACCESSORIES ......................................................................................................................... 44

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.

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DMOC205SS VMOC205SS

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.

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.

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Notes

DMOC205SS VMOC205SS

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DMOC205SS VMOC205SS

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts 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.

may result in a severe, possibly

Don't Touch ! Danger High Voltage

Before Servicing

1. Disconnect the power supply cord , and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.

The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the high-voltage capacitor (that is the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

Whenever troubleshooting is performed the power supply 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.

When the testing is completed,

1. Disconnect the power supply cord, and then remove

outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect the leads to the primary of the power transformer.

5. Reinstall the outer case (cabinet).

6. Reconnect the power supply cord after the outer case is installed.

7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components during testing.

2. Reinstall the outer case (cabinet).

3. Reconnect the power supply cord after the outer case is installed.

4. Run the oven and check all functions.

Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power to HIGH and set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) 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.

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DMOC205SS VMOC205SS

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/cm

3) 5.0mW/cm

when the outer enclosure is removed with a test load of 275 ± 15 ml of water at an initial temperature 20±5oC.

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.

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DMOC205SS VMOC205SS

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/cm 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±5

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.

at any point 5cm or more from the external

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.

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SERVICE MANUAL

VIKING RANGE CORPORATION

MICROWAVE OVENS

DMOC205SS VMOC205SS

FOREWORD

PRODUCT DESCRIPTION

GENERAL INFORMATION

DMOC205SS VMOC205SS

This Manual has been prepared to provide Viking Service Personnel with Operation and Service Information for the Viking Microwave Ovens, DMOC205SS, VMOC205SS.

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.

WARNING

Never operate the oven until the following points are ensured: (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is no other visible damage with the oven.

Servicing and repair work must be carried out only by trained service personnel.

DANGER

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.

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST

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

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DMOC205SS VMOC205SS

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts

13.0 Amperes (Microwave) / 13.0 Amperes (Convection)

60 Hertz / Single phase, 3 wire grounded

Power Output 900 watts (IEC 705 Test Procedure)

Operating frequency of 2450MHz

Convection Power Output 1450 Watts

Case Dimensions Width 24-5/8" Height 14-7/8" Depth 19-1/8"

Cooking Cavity Dimensions (1.5 Cubic Feet ) Width 16-1/8" Height 9-5/8" Depth 16-1/8"

Control Complement Touch Control System

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

Convection Temperature for Variable Cooking

CONVECTION .............................................. 100 - 450οF Temp. control

LOW MIX. BAKE .............................. 350οF with 10% microwave power

HIGH MIX. ROAST ........................... 300οF with 30% microwave power

SLOW COOK ........................................ 300οF for 4 hours (no preheat)

BROIL............................................................................ 450οF (preheat)

Help pad, Reheat pad, Add-A-Minute pad, Popcorn pad Defrost pad, Sensor Cook pad, Convec Broil pad Convec Roast pad, Convec Bake pad, Convec pad Broil pad, Slow Cook pad, Preheat pad. Number and temperature selection pads, Timer pad, Clock pad Stop/Clear pad, Power Level pad, Start / Touch On pad

Oven Cavity Light Yes

Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J Canadian Standards Association. Health CANADA, Industry 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 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.

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DMOC205SS VMOC205SS

Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, 15 or more amp. fused electrical supply. It is recommended that a

3-Pronged Plug

Grounded Receptacle Box

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

Grounding Pin

electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If an extension cord must be used, it should be a 3-wire, 15

3-Pronged Receptacle

amp. or more 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.

OVEN DIAGRAM

11 6

TOUCH CONTROL PANEL

1. Ventilation openings. (Rear side)

2. Oven door with see-through window.

3. Oven lamp.

4. Turntable support.

5. Removable turntable. The turntable will rotate clockwise or counterclockwise.

6. Safety door latches. The oven will not operate unless the door is securely closed.

7. Wave guide cover.

8. Door open button.

9. Auto-Touch control panel.

10. Lighted digital display.

11. Convection air openings.

12. Removable low rack. (Broiling trivet)

13. Removable low rack. (Baking rack)

14. Turntable motor shaft.

15. Power supply cord.

VMOC205SS

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DMOC205SS VMOC205SS

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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, 117 volts A.C. is supplied to the control unit. (Figure O-1).

1. The display will show "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.

NOTE: When the door is opened, the oven lamp comes on.

2. A signal is input to the control unit, energizing the coil of shut-off relay (RY-4). RY4 contacts close, completing a circuit to the damper motor. The damper motor now operates moving the damper to the open position, thereby closing the contacts of the damper switch inputs a signal to the control unit. The coil of relay RY4 is de-energized, opening its contacts, thereby turning off the damper motor.

COOKING CONDITION

Program desired cooking time Variable Cooking Control by touching the NUMBER pads and the power level pad. When the START pad is touched, the following operations occur:

1. The contacts of relays are closed and components connected to the relays are turned on as follows. (For details, refer to Figure O-2)

RELAY CONNECTED COMPONENTS

RY-1 Oven lamp/Turntable motor

RY-2 Power transformer

RY-3 Heating element

RY-4 Damper motor

RY-5 Convevtion motor

RY-6 Fan motor

2. 117 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3 volts A.C. output on the filament winding, and approximately 2360 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, third door switch, monitor switch, door sensing switch, the secondary interlock relay and the primary interlock

switch 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 is electrically monitoring the operation of the relay (RY1) and the primary interlock switch and is mechanically associated with the door so that it will function in the following sequence.

(1) When the door opens from a closed position, the door

sensing switch and the primary interlock switch open their contacts, and then the monitor switch contacts close and then the third door switch contacts open.

(2) When the door is closed from the open position, the

monitor switch contacts open and the third door switch contacts close first, and then the contacts of the primary interlock switch and the door sensing switch close.

If the relay (RY1) and the primary interlock switch fail with their contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, the relay (RY1) and the primary interlock switch, causing the monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 117 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2). RY-2 is operated by the control unit within an varying time base. Microwave power operation is as follows:

VARI-MODE ON TIME OFF TIME Power 10(P-HI) 32 sec. 0 sec.

(100% power) Power 9(P-90) 30 sec. 2 sec.

(approx. 90% power) Power 8(P-80) 26 sec. 6 sec.

(approx. 80% power) Power 7(P-70) 24 sec. 8 sec. (approx. 70% power)

Power 6(P-60) 22 sec. 10 sec. (approx. 60% power)

Power 5(P-50) 18 sec. 14 sec. (approx. 50% power)

Power 4(P-40) 16 sec. 16 sec. (approx. 40% power)

Power 3(P-30) 12 sec. 20 sec. (approx. 30% power)

Power 2(P-20) 8 sec. 24 sec. (approx. 20% power)

Power 1(P-10) 6 sec. 26 sec. (approx. 10% power)

Power 0(P-0) 0 sec. 32 sec. (0% power)

Note: The ON/OFF time ratio does not correspond with

the percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament.

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DMOC205SS

12 SEC. 20 SEC.

32 SEC.

LOW MIX

BAKE

HIGH MIX

ROAST

MICROWAVE POWER

= APPROX. 30%

CONVECTION

TEMPERATUE

= 300°F

MICROWAVE POWER

= APPROX. 10%

CONVECTION

TEMPERATUE

= 350°F (180°C)

26 SEC.6 SEC.

OFF

(MICRO.)

(CONVEC.)

(MICRO.)

(CONVEC.)

VMOC205SS

CONVECTION COOKING CONDITION

PREHEATING CONDITION

Program desired convection temperature by touching the CONVECTION pad and the Temperature pad. When the START pad is touched, the following operations occur:

1. The coil of shut-off relays (RY1, RY3,RY5 and RY6) are energized, the oven lamp, cooling fan motor, turntable motor and convection motor are turned on.

2. The coil of relay (RY4) is energized by the control unit. The damper is moved to the closed position, opening the damper switch contacts. The opening of the damper switch contacts sends a signal to the LSI on the control unit de-energizing the relay (RY4) and opening the circuit to the damper motor.

3. The coil of heater relay (RY3) is energized by the control unit and the main supply voltage is applied to the heating element.

4. When the oven temperature reaches the selected preheat temperature, the following operations occur: 4-1 The heater relay is de-energized by the control unit

temperature circuit and thermistor, opening the circuit to the heating element.

4-2. The oven will continue to function for 30 minutes,

turning the heater on and off, as needed to maintain the selected preheat temperature. The oven will shut-down completely after 30 minutes

CONVECTION COOKING CONDITION

When the preheat temperature is reached, a beep signal will sound indicating that the holding temperature has been reached in the oven cavity. Open the door and place the food to be cooked in the oven. Touch the CONVEC pad first and then touch the Temperature pad. And program desired cooking time by touching the Number pads. When the START pad is touched, the following operations occur:

1. The numbers on the digital read-out start to count down to zero.

2. The oven lamp, turntable motor, cooling fan motor and convection motor are energized.

3. Heater relay (RY3) is energized (if the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the heating element to return to the selected cooking temperature.

4. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 275οF, the circuit to RY6 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 245οF, at which time the relay will be de-energized, turning off the fan motor. Relay RY5 will however, open as soon as the convection cycle has ended, turning off the convection fan motor.

5. At the end of the convection cook cycle, shut-off relay (RY4) is energized turning on the damper motor. The damper is returned to the open position, closing the damper switch contacts which send a signal to the control unit, de-energizing shut-off relay (RY4).

AUTOMATIC MIX COOKING CONDITION

Touch the HIGH MIX/ROAST or the LOW MIX/BAKE pad

first. And then program desired cooking time by touching the Number pads. The LOW MIX/BAKE pad is preprogrammed for 350

F with 10% microwave power, while the HIGH MIX/ROAST pad is preprogrammed for 300οF with 30% microwave power. When the START pad is touched, the following operations occur:

1. The numbers on the digital read-out start to count down

to zero.

2. The shut-off relays (RY1,RY2,RY3,RY5 and RY6) are

energized, turning on the oven lamp, turntable motor, cooling fan motor and convection fan motor.

3. The shut-off relay (RY4) is energized.

The damper door is closed from the open position.

4. The heater relay (RY3) is energized, applying the main

supply voltage to the heating element.

5. Now, the oven is in the convection cooking condition.

6. When the oven temperature reaches the selected

temperature, the following operations occur: 6-1. The power supply voltage is alternated to the

heating element and power transformer.

6-2. The heating element operates through the heater

relay (RY3) contacts and the power transformer operates through the primary interlock relay (RY2) contacts.

6-3. These are operated by the control unit to supply

alternately within a 32 second time base, convection heat and microwave energy.

The relationship between the convection and microwave power operations are as follows.

Note: The ON and OFF time ratio does not correspond

with the percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament.

Note: During alternate Microwave/Convection operation,

the convection heater is energized only if the cavity temperature drops below the set temperature.

SENSOR COOKING CONDITION

Using the SENSOR COOK function, the foods are 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.

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DMOC205SS VMOC205SS

The sensor “senses” the vapor and its resistance increases 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:

1. Potatoes at room temperature.

Vapor is emitted very slowly.

ICROW

AVE

2. Heat potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.

3. Sensor detects moisture and

AH SENSOR

ICROW

AVE

humidity and calculates cooking time and variable power.

Cooking Sequence.

1. Touch SENSOR COOK pad.

NOTE: The oven should not be operated on SENSOR

COOK immediately after plugging in the unit. Wait two minutes before cooking on SENSOR COOK.

2. Select desired Sensor setting.

3. Touch START pad. The coil of shut-off relay (RY1, RY6) is energized, the oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

4. 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.

NOTE: During this first stage, do not open the door or

touch STOP/CLEAR pad.

5. 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 food, turn it or season, etc.

6. 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.

7. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

COMPU BROIL/ COMPU ROAST/ COMPU BAKE

COMPU BROIL/ ROAST/ BAKE will automatically compute the oven temperature, microwave power and cooking time for baking, roasting and broiling. Set the desired program by touching the COMPU BROIL/ ROAST/ BAKE pad, and number pad. Enter the weight by touching the Number pads. When the START pad is touched, the following operations occur:

1. The COOK indicator will light and the Convection Fan Symbol will rotate.

2. The cooking time will appear on the display and start counting down to zero. The cooking time is adjusted automatically according to the weight of the food.

3. The shut-off relays (RY1, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The power supply voltage is applied to the heating element.

4. Now, the oven is in the convection cooking mode.

5. When the oven temperature has reached the programmed convection temperature, the oven goes into the programmed cooking mode.

6. At the end of the COMPU BROIL/ ROAST/ BAKE cycle, the damper is returned to the open position and the oven will go to the off condition. The cooling fan will remain on until the oven has cooled.

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to defrost meats and poultry faster and better. COMPU DEFROST automatically defrosts roast beef, etc.. When the COMPU DEFROST is selected and the food weight is entered by using the COMPU DEFROST pad, the oven will cook according to the special cooking sequence.

FIRE SENSING FEATURE (MICROWAVE MODE)

This model incorporates a sensing feature which will stop the oven's operation if there is a fire in the oven cavity during microwave cooking. This is accomplished by the LSI repeatedly measuring the voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base comparing the obtained voltage measurements. If the most recent voltage measured is 300mV greater than the previous voltage measured, the LSI judges it as a fire in the oven cavity and switches off the relays to the power transformer, fan motor and convection motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity. Please refer to the following section for a more detailed description.

Operation

Please refer to the timing diagrams below.

1. The thermistor operates within a 32-seconds time base and it is energized for three (3) seconds and off for 29 seconds. Two (2) seconds after the thermistor is energized, the voltage across the temperature measurement circuit is sampled by the LSI and twenty one (21) seconds after the thermistor is cut off the LSI turns on the cooling fan for six (6) seconds.

2. The above procedure is repeated. If the difference between the first voltage measured (in step 1) and the voltage measured when the procedure is repeated (step

2) is greater than 300mV the LSI makes the judgment that there is a fire in the oven cavity and will switch off the relays to the power transformer, fan motor and convection motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity.

3. Once the fire sensor feature has shut the unit down, the programmed cooking cycle may be resumed by pressing the "START" pad or the unit may be reset by pressing the "CLEAR" pad.

CONVECTION

MOTOR

THERMISTOR

Sensing

Voltage

0 2 3 24 30 32 (sec.) 64 (sec.)

OFF

3 sec.

OFF

Sensing the voltage across temperature measurement circuit.

6 sec.

Page 13

DMOC205SS VMOC205SS

IMPORTANT: During sensor cooking operation, the fire sensing operation sequence will not begin until the AH sensor has

SCHEMATIC DIAGRAM

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CLOCK APPEARS ON DISPLAY.

FUSE

117V 60Hz

SCHEMATIC

NOISE FILTER

0.0033µ/AC125V

NOISE SUPPRESSION COIL

0.022µ/AC250V

0.0033µ/AC125V

OVEN LAMP

THIRD DOOR SWITCH

CONV. THERMAL CUT-OUT

TTM

TURNTABLE MOTOR

CONVECTION MOTOR

FAN MOTOR

DAMPER MOTOR

MAGNETRON THERMAL CUT-OUT

A-7

A-9

DOOR SENSING SWITCH

OVEN THERMAL CUT-OUT

RY4

CONTROL UNIT

THERMISTOR

detected vapors and initiated a sensor cooking cycle. This is because the operation of the convection fan would interfere with the AH sensor's vapor detection.

COM.

RY6

RY2

F-3 F-2

(RY1)

RY1

SECONDARY INTERLOCK RERAY

AH SENSOR

F-1

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

POWER TRANSFORMER

PRIMARY INTERLOCK SWITCH

CAPACITOR

0.94µ

MONITOR SWITCH

HEATIMG ELEMENT

RY5

RY3

E-5E-4E-3E-2E-1

E-6

DAMPER SWITCH

MAGNETRON

H.V. RECTIFIER

NOTE: CONDITION OF OVEN

SCHEMATIC

1. DOOR CLOSED.

2. COOKING TIME PROGRAMMED.

3. “START” PAD TOUCHED.

CONV. THERMAL CUT-OUT

TTM

TURNTABLE MOTOR

OVEN LAMP

117V 60Hz

NOISE FILTER

FUSE

NOISE SUPPRESSION COIL

0.0033µ/AC125V0.0033µ/AC125V

0.022µ/AC250V

THIRD DOOR SWITCH

Figure O-1. Oven Schematic-OFF Condition

CONVECTION MOTOR

FAN MOTOR

DAMPER MOTOR

MAGNETRON THERMAL CUT-OUT

A-7

A-9

DOOR SENSING SWITCH

OVEN THERMAL CUT-OUT

RY4

CONTROL UNIT

THERMISTOR

RY5

RY3

E-6

E-5E-4E-3E-2E-1

DAMPER SWITCH

RY6

RY2

F-3 F-2

COM. (RY1)

RY1

SECONDARY INTERLOCK RERAY

AH SENSOR

F-1

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

POWER TRANSFORMER

PRIMARY INTERLOCK SWITCH

CAPACITOR

0.94µ

MONITOR SWITCH

HEATIMG ELEMENT

MAGNETRON

H.V. RECTIFIER

Figure O-2. Oven Schematic-Microwave Cooking Condition

Page 14

DMOC205SS VMOC205SS

NOTE: CONDITION OF OVEN

SCHEMATIC

1. DOOR CLOSED.

2. MIX COOKING PAD TOUCHED.

3. COOKING TIME PROGRAMMED.

4. “START” PAD TOUCHED.

5. RY2 AND RY3 WILL ALTERNATELY CLOSE. DURING COOK CYCLE.

117V 60Hz

NOISE FILTER

FUSE

NOISE SUPPRESSION COIL

0.0033µ/AC125V0.0033µ/AC125V

0.022µ/AC250V

THIRD DOOR SWITCH

CONV. THERMAL CUT-OUT

TTM

TURNTABLE MOTOR

OVEN LAMP

FAN MOTOR

MAGNETRON THERMAL CUT-OUT

CONVECTION MOTOR

DAMPER MOTOR

A-7

A-9

DOOR SENSING SWITCH

OVEN THERMAL CUT-OUT

RY4

CONTROL UNIT

THERMISTOR

RY5

RY3

E-5E-4E-3E-2E-1

E-6

DAMPER SWITCH

RY6

RY2

F-3 F-2

COM. (RY1)

RY1

SECONDARY INTERLOCK RERAY

AH SENSOR

F-1

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

POWER TRANSFORMER

PRIMARY INTERLOCK SWITCH

CAPACITOR

0.94µ

MONITOR SWITCH

HEATIMG ELEMENT

MAGNETRON

H.V. RECTIFIER

Figure O-3. Oven Schematic-Automatic Mix Cooking Condition

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CONVECTION PAD TOUCHED.

3. DESIRED TEMP. TOUCHED.

4. COOKING TIME PROGRAMMED.

5. “START” PAD TOUCHED.

FUSE

117V 60Hz

SCHEMATIC

NOISE FILTER

0.0033µ/AC125V0.0033µ/AC125V

NOISE SUPPRESSION COIL

0.022µ/AC250V

OVEN LAMP

THIRD DOOR SWITCH

TTM

TURNTABLE MOTOR

CONV. THERMAL CUT-OUT

CONVECTION MOTOR

FAN MOTOR

MAGNETRON THERMAL CUT-OUT

DAMPER MOTOR

A-7

A-9

DOOR SENSING SWITCH

OVEN THERMAL CUT-OUT

RY4

CONTROL UNIT

THERMISTOR

RY5

RY3

E-5E-4E-3E-2E-1

E-6

DAMPER SWITCH

RY6

RY2

F-3 F-2

COM. (RY1)

RY1

SECONDARY INTERLOCK RERAY

AH SENSOR

F-1

N.O. (RY1)

COM. (RY3)

COM. (RY2)

N.O. (RY2)

N.O. (RY3)

POWER TRANSFORMER

PRIMARY INTERLOCK SWITCH

CAPACITOR

0.94µ

MONITOR SWITCH

HEATIMG ELEMENT

MAGNETRON

H.V. RECTIFIER

Figure O-4. Oven Schematic-Convection Cooking Condition

Page 15

DESCRIPTION AND FUNCTION OF COMPONENTS

DMOC205SS VMOC205SS

DOOR SENSING AND PRIMARY INTERLOCK SWITCHES

The door sensing switch in the secondary interlock system is mounted in the upper position on the latch hook, the primary interlock switch is mounted in the lower position on the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to all components. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches. The secondary interlock system consists of the door sensing switch and secondary interlock relay located on the control circuit board.

LATCH HOOK

THIRD DOOR SWITCH

DOOR SENSING SWITCH

LATCH HEADS

DOOR OPEN BUTTON

MONITOR SWITCH

PRIMARY INTERLOCK SWITCH

SWITCH LEVER

OPEN LEVER

Figure D-1. Door sensing switch, monitor switch, third

door switch and primary interlock switch

MONITOR SWITCH

The monitor switch is mounted on the middle position of latch hook. It is activated (the contacts opened) by the lower latch head 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 relay RY1 and primary interlock 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 door sensing and primary interlock and third door switches 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, third door switch and the primary interlock switch contacts close. (On opening the door, each of these switches operate inversely.)

3. If the door is opened, and the relay RY1 and the primary

interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH, RELAY(RY1) AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

THIRD DOOR SWITCH

The switch is activated by the latch heads, while the door is closed. When the door is opened, the switch interrupt the circuit to the power transformer. This switch prevents power transformer engaging and microwave when the door opened.

THERMISTOR

The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the heater relay to operate, thus the current to the heating element is turned ON/OFF.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located on the waveguide is designed to prevent damage to the magnetron if an over heated condition develops in the magnetron due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the magnetron, the thermal cut-out will open at 257οF (125οC) causing the oven to shut down. magnetron thermal cut-out is not reset at room temperature.

OVEN THERMAL CUT-OUT

The thermal cut-out located on the side of the steam duct is designed to prevent damage to the unit if the foods in the oven catch fire due to over heating produced by improper setting of cooking time or failure of control unit. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the thermal cut-out will open at 302οF (150οC) causing the oven to shut down. When the thermal cut-out has cooled, the thermal cut-out closes at 266οF (130οC)

CONV. THERMAL CUT-OUT

The thermal cut-out located on the left side of the thermal protection plate (left) is designed to prevent damage to the heater unit if an over heated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the heater unit, the thermal cut-out will open at 302οF (150οC) causing the oven to shut down. When the thermal cut-out has cooled, the thermal cut-out closes at 266οF (130οC)

HEATING ELEMENT

The heating element is located at the left side of the oven cavity. It is intended to heat air driven by the convection fan. The heated air is kept in the oven and force-circulated and reheated by the heating element.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the heating element, but is heated by forced circulation of the hot air produced by the heating element. The air heated by the heating element is circulated through the convection passage provided on the outer casing of the

Page 16

DMOC205SS VMOC205SS

oven cavity by means of the convection fan which is driven by the convection motor. It then enters the inside of the oven through the vent holes provided on the left side of the oven. Next, the hot air heats the food on the turntable and leaves the oven cavity through the vent in the center of the oven cavity left side wall. Without leaving the oven, this hot air is reheated by the heating element, passes through the convection passage and enters the inside of the oven cavity again, in a continuing cycle. In this way, the hot air circulates inside the oven cavity to raise its temperature and, at the same time, comes into contact with the food being cooked. When the temperature inside the oven cavity reaches the selected temperature, the heating element is de-energized. When the temperature inside the oven cavity drops below the selected temperature, the heating element is energized again. In this way, the inside of the oven cavity is maintained at approximately the selected temperature. When the convection time reaches 0, the heating element is de-energized and the convection fan stops operating and the oven shuts off.

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during convection cooking. Damper position is set automatically by damper motor, damper switch, motor cam and damper shaft. These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the control unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooling air is channelled through the cavity to remove steam and vapors given off from the heating foods. It is then exhausted at the top of the oven cavity into a condensation compartment. Convection Cooking: Damper is in the closed position, so that no hot air will be allowed to leak out the oven cavity.

Damper Operation

1. When power supply cord is plugged in: 1-1. When power supply cord is plugged in, a signal is

sensed in the control unit, and operates shut-off relay (RY4).

1-2. Contacts of shut-off relay (RY4) close, the damper

motor is energized, opening the damper door.

1-3. When the damper is moved to the open position by

the damper cam the damper switch is closed (ON position).

1-4. The signal from damper switch is re-sensed in the

control unit and shut-off relay (RY4) is turned off.

1-5. The 120 volts A.C. to the damper motor is removed

and the motor turns off.

2. When oven is microwave cooking: Damper is in the open position.

3. When oven is convection cooking: 3-1. Damper motor is energized by touching the

convection, temperature and START pads.

3-2. When damper is in the closed position (damper

switch is OFF), its signal is sensed by the control unit, and shut-off relay (RY4) is de-energized.

3-3. The damper is held in the closed position during the

convection cooking operation.

3-4. At the end of the convection cooking, shut-off relay

(RY4) is energized, and the damper is returned to the open position.

NOTE: If the damper door is not in the proper position,

closed during convection or open during microwave, the control unit will stop oven operation after 1 minute.

Figure D-2. Damper Mechanism

DAMPER SHAFT

DAMPER DUCT

DAMPER

DAMPER CAM

DAMPER SWITCH

DAMPER MOTOR

TROUBLESHOOTING GUIDE

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 monitor switch, relay (RY1),

door sensing switch and primary interlock switch before replacing the monitor fuse. If monitor fuse is replaced, the mintor switch must also be replaced at the same time. Use part FFS-BA012WRK0 as an assembly.

Page 17

DMOC205SS VMOC205SS

CONDITION

PROBLEM

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

A MAGNETRON

B POWER TRANSFORMER

C H.V. RECTIFIER ASSEMBLY

D HIGH VOLTAGE CAPACITOR

E PRIMARY INTERLOCK SWITCH

F SECONDARY INTERLOCK SYSTEM

G MONITOR SWITCH

H MONITOR FUSE

E THIRD DOOR SWITCH

I THERMAL CUT-OUT

J CONVECTION HEATER

K THERMISTOR

L DAMPER MOTOR

M DAMPER SWITCH

P TOUCH CONTROL PANEL

Q KEY UNIT

R RELAY RY-1

R RELAY RY-2

R RELAY RY-3

R RELAY RY-4

R RELAY RY-5

R RELAY RY-6

T FOIL PATERN ON PWB.

U AH SENSOR

Replace OVEN LAMP OR SOCKET

Replace FAN MOTOR

Replace TURNTABLE MOTOR

Replace CONVECTION MOTOR

Check LOOSE WIRING

Check SHORTED IN POWER CORD

Check NO POWER AT OUTLET

Check LOW VOLTAGE

O NOISE FILTER

OFF CONDITION

Home fuse blows when power cord is plugged into wall receptacle.

Monitor fuse blows when power cord is plugged into wall receptacle

88:88 does not appear in display when power cord is first plugged into

wall receptacle.

Display does not operate properly when STOP/CLEAR pad is touched.

COOKING CONDITION

(The time of day should appear on the display with beep sound.)

Oven lamp does not light with door opened.

Oven lamp does not light in cook cycle. (It light when door is opened).

Cooking cycle runs 1 minute then shuts down.

Oven lamp light, but turntable motor does not operate.

Turntable motor operates normally but cooling fan motor does not

operate.

(MICROWAVE)

Oven does not go into a cook cycle, when START pad is touched.

Low or no power is produced during microwave cooking (The food is

heated incompletely or not heated at all)

Extremely uneven heating is produced in oven load (food).

Function of variable cooking does not operate properly except HIGH

power.

(CONVECTION)

Function of COMPU DEFROST does not operate properly.

CONV indicator lights, but oven does not go into cook cycle when

START pad is touched.

CONV indicator lights, but heating element does not heat.

Temperature in the oven cavity is lower or higher than preset.

(SENSOR

COOKING)

Cooling fan motor runs intermittently or all the time.

Convection cycle runs 4 minutes and 15 seconds then shuts down.

Oven in the sensor cooking condition but AH sensor does not end or

AH sensor turns off about max. 30 min. after start.

Page 18

DMOC205SS VMOC205SS

PROCEDURE

LETTER

TEST PROCEDURES

COMPONENT TEST

A MAGNETRON ASSEMBLY TEST

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED.

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

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.

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.

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 HI(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 22 to 43οF(12.2 to 23.8οC) 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 117 volts and the oven cavity is clean.

B POWER TRANSFORMER TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

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 84.4 ohms; the resistance of the filament coil should be less than 1 ohm.

(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

C HIGH VOLTAGE RECTIFIER TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

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.

D HIGH VOLTAGE CAPACITOR TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

Page 19

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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 approximately 10 MΩ 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.

E PRIMARY INTERLOCK SWITCH AND THIRD DOOR SWITCH TEST

Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the switch.

F SECONDARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicated 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.

SECONDARY INTERLOCK RELAY Disconnect two (2) wire leads from the tab terminal of the secondary interlock relay (RY2). 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.

DMOC205SS VMOC205SS

G MONITOR SWITCH

Disconnect the oven from power supply. Before performing this test, make sure that the primary interlock switch and the secondary interlock relay are operating properly, according to the above Test Procedures. Disconnect the wire lead from the monitor switch (NC) 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, re-connect the wire lead to the monitor switch (NC) terminal and check for continuity of monitor circuit.

H BLOWN MONITOR FUSE

If the monitor fuse is blown when the door is opened, check the primary interlock switch, door sensing switch relay (RY1) and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.

CAUTION: IF THE MONITOR FUSE IS BLOWN BY IMPROPER SWITCH OPERATION, THE

MONITOR FUSE AND SWITCH MUST BE REPLACED WITH "MONITOR FUSE AND SWITCH ASSEMBLY" PART NUMBER FFS-BA012WRK0, EVEN IF THE MONITOR SWITCH OPERATES NORMALLY. THE MONITOR FUSE AND SWITCH ASSEMBLY IS PACKED WITH 20 AMPERE FUSE AND SWITCH.

SCREW DRIVER

N.C.

MONITOR SWITCH

COM.

PRIMARY INTERLOCK SWITCH

OHMMETER

I OVEN THERMAL CUT-OUT (on the side of steam duct)

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the oven thermal cut-out reaches approximately 302οF (150οC). The thermal cut-out reset automatically at approximately 266οF (130οC). If the thermal cut-out has operated under the normal condition, replace the thermal cut-out. An open thermal cut-out indicates overheating of the oven cavity.

Page 20

DMOC205SS VMOC205SS

PROCEDURE

LETTER

MAGNETRON THERMAL CUT-OUT (on the waveguide)

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 257 An open thermal cut-out indicates overheating of the magnetron. Check for restricted air flow to the magnetron through the vent holes of the oven cavity, especially the cooling duct and cooling fan.

CAUTION: IF THE THERMAL CUT-OUT INDICATES OPEN CIRCUIT AT ROOM TEMPERATURE,

REPLACE THE THERMAL CUT-OUT.

CONVECTION CUT-OUT (on side of the heater duct)

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of thermal cut-out reaches 302οF (150οC). The thermal cut-out resets automatically at approximately 266οF (130οC). If the thermal cut-out has operated under the normal condition, replace the thermal cut-out. An open thermal cut-out indicates overheating of heater unit, check for restricted air flow to the heater unit through the vent hole of the oven cavity, especially the heater duct and convection fan.

J HEATING ELEMENT TEST

Make sure the heating element is fully cooled and test as follows; a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the

resistance between the heating element terminals should be approximately 10.2Ω.

b. Disconnect wire leads and measure the insulation resistance with 500V - 100MΩ insulation

resistance meter. The insulation resistance between heating element terminal and cavity should be more than 0.5MΩ.

TEST PROCEDURES

COMPONENT TEST

F (125οC).

K THERMISTOR TEST

Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.

Room Temperature Resistance 68οF(20οC) - 86οF(30οC) Approx. 350kΩ - 155KΩ

If the meter does not indicate above resistance, replace the thermistor

L DAMPER MOTOR TEST

When the power cord is plugged into the wall receptacle and 117 volts A.C. is supplied to the damper motor, the motor operates until the damper is opened and the damper switch closes. Then the damper motor stops operation. If the damper motor does not operate, check for A.C. voltage with a voltmeter at the motor.

1. Disconnect the power cord from the wall receptacle.

2. Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.

3. Re-connect the power cord into the wall receptacle. If 117 volts A.C. is indicated at the wire leads, replace the motor and if 117 volts A.C. is not indicated, check the wire harness and control unit.

M DAMPER SWITCH TEST

Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM.) and normally open (N.O.) terminals of the switch.

1. When switch actuator is pushed by the damper motor cam, the meter should be indicated a closed circuit.

2. When power cord is plugged into the wall receptacle, the damper motor operates and damper cam will start to rotate. When the switch actuator is released, the meter should be indicated an open circuit. If improper operation is indicated, replace the damper switch.

N CHECKING TEMPERATURE IN THE CONVECTION MODE

It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type

Page 21

PROCEDURE

LETTER

DMOC205SS VMOC205SS

TEST PROCEDURES

COMPONENT TEST

temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate. The temperature should be checked with outer case cabinet installed, approx. 5 minutes after preheat temperature is reached (audible signal sounds four times). The temperature experienced may be approx. 30οF more or less than indicated on the display, however, in most cases the food cooking results will be satisfactory. Difference in power supply voltage will also affect the oven temperature. The Household power supply voltage may sometimes become lower than the rated voltage (117 V) and cause under-cooking. If the power supply voltage is 10% lower than the rated voltage, longer cooking time is required by 10% to 20%.

O NOISE FILTER TEST

Disconnect the oven from power supply. Disconnect the lead wires from the terminal the noise filter. Using an ohmmeter, check between the terminals as described in the following table.

MEASURING POINT INDICATION OF OHMMETER

Between N and H Open circuit.

Between terminal N and GRAY Short circuit.

Between terminal H and RED Short circuit.

If incorrect reading are obtained, replace the noise filter.

P 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 troubleshooting by unit replacement is described according to the symptoms indicated.

1. Key Unit. Note : Check key unit ribbon connection before replacement. The following symptoms indicate a defective key unit. Replace the 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.

2. Control Unit The following symptoms indicate a defective control unit. Replace the control unit.

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) All digits in the figure flicker.

2-3 Other possible troubles 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. d) Proper temperature measurement is not obtained.

Note: When defective components, the Control Unit or Key Unit are replaced, the defective part or parts

must be properly packed for return in the shipping carton, with its cushion material, in which the new replacement part was shipped to you.

0.0033µF / AC 125V

NOISE FILTER

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR

0.22µF / AC 250V

LINE BYPASS

CAPACITOR

FUSE 20A

LINE BYPASS

CAPACITOR

0.0033µF / AC 125V

REDGRY

Page 22

DMOC205SS VMOC205SS

PROCEDURE

LETTER

Q KEY UNIT TEST

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 a 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.

TEST PROCEDURES

COMPONENT TEST

G 5 G 6 G 7 G 8 G 9 G10 G11 G12

G 4

G 3

G 2

G 1

ADD-A-

MINUTE

POPCORN

REHEAT

HELP

KEY UNIT

DEFROST

PREHEAT

SLOW COOK

SENSOR

COOK

CONVEC

LOW MIX

BAKE

CONVEC

ROAST

LEVEL

CONVEC

BAKE

CLOCK

BROIL

12345

100°F 150°F 275°F 300°F 325°F

67890

350°F 375°F 400°F 425°F 450°F

TIMER POWER

BROIL

START

TOUCH ON

HIGH MIX

ROAST

STOP

CLEAR

R RELAY TEST

Remove the outer case and check voltage between Pin Nos. 7 and 9 of the 9- pin connector (A) on the control unit an A.C. voltmeter. The meter should indicate 120 volts, if not check the oven circuitry.

Shut-off, Cook and Heater 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 or convection 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

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 19.0V D.C. Oven lamp / Turntable motor

RY2(COOK) Approx. 18.0V D.C. Power transformer

RY3(HEATER) Approx. 18.0V D.C. Heating element

RY4 Approx. 19.0V D.C. Damper motor

RY5 Approx. 19.0V D.C. Convection motor

RY6 Approx. 19.0V D.C. Cooling fan motor

S COMPU DEFROST TEST

(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 twice and touch the Number pad "5". And then touch the

"START" pad. (3) After 2 sec. Now the oven is in DEFROST cooking condition. (4) The oven will operate as follows.

WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE

LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME

0.5lbs 70% 47sec. 0% 52sec. 50% 32sec. 30% 40sec.

unit is defective.

(5) If improper operation is indicated, the control unit is probably defective and should be checked.

Page 23

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

T PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD

(PWB) IS OPEN.

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. If the foil pattern is open, follow the troubleshooting guide given below for repair. Problem: POWER ON, indicator does not light up.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 The rated voltage is not applied to POWER Check supply voltage and oven power cord.

terminal of CPU connector (CN-A).

2 The rated voltage is applied to primary side Power transformer or secondary circuit defective.

of power transformer. Check and repair.

3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.

4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

CONV M FAN M POWER

NOTE: *At the time of making these repairs, make a

visual inspection of the varistor. Check for

357 9

VRS1

burned damage and examine the transformer with an ohmmeter for the presence of layer short-circuit (check the primary coil resistance which is approximately 175

Ω ± 10%). If

any abnormal condition is detected, replace the defective parts.

CN - A

(J1)

DMOC205SS VMOC205SS

U AH SENSOR TEST

Checking the initial sensor cooking condition

(1) The oven should be plugged in at least two minutes before sensor cooking. (2) Room temperature should not exceed 95οF (35οC). (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 a conventional surface unit. Refer to the "INSTALLATION Instructions".

(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 a 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 vapour given of by the spray and turn off before food is properly cooked.

(8) After 30 minutes if the sensor has not detected the vapour of the food, ERROR will appear and the

oven will shut off.

Water load cooking test

Make sure the oven has been plugged in at least five minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) Touch SENSOR COOK pad and number pad 1. Now, the oven is in the sensor cooking condition

and "BAKED POTATO" will appear in the display.

(5) Touch Start pad. The oven will operate for the first 16 seconds, without generating microwave energy.

Page 24

DMOC205SS VMOC205SS

PROCEDURE

LETTER

TEST PROCEDURES

COMPONENT TEST

When the AH sensor is defective (open or short), Error will appear in the display after 16 seconds cleaning time. If ERROR appears check sensor wire connections and/or AH sensor. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of

sensor cooking.

(6) After approximately 16 seconds, microwave energy is produced, and the display should start to count

down the remaining cooking time and oven should turn off after water is boiling (bubbling). If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.

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 oven from power supply and remove outer case. (2) Discharge the high voltage capacitor. (3) Remove the AH sensor. (4) Install the new AH sensor. (5) Re-install the outer case. (6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:

6-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. 6-2. Place the container on the center of tray in the oven cavity. 6-3. Close the door. 6-4. Touch SENSOR COOK pad and number 1 pad. 6-5. Touch Start pad. The control panel is in automatic Sensor operation. 6-6. 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 dose not operate properly, the problem is with the control unit.

CHECKING CONTROL UNIT

(1) Disconnect oven from power supply and remove outer case. (2) Discharge the high voltage capacitor. (3) Disconnect the wire leads from the cook relay. (4) Disconnect the sensor connector that is mounted to lower portion of control panel. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel. (6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:

6-1. Touch SENSOR COOK pad and number 1 pad.

6-2. Touch Start pad. The control panel is in the sensor cooking operation.

6-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This

condition is same as judgement by AH sensor.

6-4. After approximately 3 seconds, the display shows " X X . X X " which is the 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.

R1,R2 : 22Ω ± 1% 1/2W

Plunger

COM

F-1 F-2

F-3

To connector (F) on Control Unit.

CONNECTOR

R3 : 4.3kΩ ± 5% 1/4W

R4 : 1MΩ ± 5% 1/4W

R3 R4

COM

Sensor Dummy Resistor Circuit

Page 25

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

DMOC205SS VMOC205SS

The touch control section consists of the following units as shown in the touch control panel circuit.

(1) Key Unit (2) Control Unit

The principal functions of these units and the signals communicated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals P10 - P17 generated in the LSI are sent to the key unit. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R24 - R27 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit, temperature measurement circuit, absolute humidity sensor circuit and indicator circuit.

1) LSI

This LSI controls the temperature measurement signal, AH sensor signal, key strobe signal, relay driving signal for oven function and indicator signal.

2) Power Source Circuit

This circuit generates the voltages necessary for the control unit from the AC line voltage.

3) Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on commercial frequency.

4) ACL Circuit

A circuit to generate a signals which resetting the LSI to the initial state when power is applied.

5) Buzzer Circuit

The buzzer is responds to signals from the LSI to emit noticing sounds (key touch sound and completion sound).

6) Temperature Measurement Circuit : (OVEN THERMISTOR)

The temperature in the oven cavity is sensed by the thermistor. The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI. The LSI uses this information to control the relay and display units.

7) Absolute Humidity Sensor Circuit

This circuit detects the humidity of a food which is being cooked, to control its automatic cooking.

8) Door Sensing Switch

A switch to inform the LSI if the door is open or closed.

9) Relay Circuit

To drive the magnetron, heating element, fan motor, convection motor, damper motor, turntable motor and light the oven lamp.

10) Indicator Circuit

Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display has 8-digits, 16-segments are used for displaying figures.

DESCRIPTION OF LSI

LSI(IXA103DR):

The I/O signals of the LSI(IXA103DR) are detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Connected to GND. 2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -30V.

Vp voltage of power source circuit input.

3 AVSS IN Power source voltage: -5V.

VC voltage of power source circuit input.

4 VREF IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)

Page 26

DMOC205SS

OFF

During

cooking

GND

(Convection)

VMOC205SS

Pin No. Signal I/O Description

5 AN7 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.

6 AN6 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. 7-9 AN5-AN3 IN Heating constant compensation terminal. 10 AN2 IN Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal(0V).

Door opened; "L" level signal(-5V). 11 AN1 IN Input signal which communicates the damper open/close information to LSI.

Damper opened; "H" level signal(0V:GND).

Damper closed; "L" level signal(-5V). 12 AN0 IN Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor,

this input is converted into temperature by the A/D converter built into the LSI. 13 P55 OUT Digit selection signal.

The relationship between digit signal and digit are as follows;

Digit signal Digit

ß(60Hz)

P03 .......................... 1st.

P02 ......................... 2nd.

P01 .......................... 3rd.

P00 .......................... 4th.

P37 .......................... 5th.

P36 ......................... 6th.

P35 ......................... 7th.

P55 ......................... 8th.

Normally, one pulse is output in every ß period, and input to the grid of the Fluores-

P03

P02

P01

P00

P37

P36

P35

P55

cent Display.

14 P54 OUT Oven lamp and turntable motor driving signal. (Square Waveform : 60Hz)

To turn on and off the shut-off relay(RY1).

16.7 msec.

The square waveform voltage is delivered to the relay(RY1) driving circuit.

During cooking

GND

15 P53 OUT Convection motor driving signal.

To turn on and off shut-off relay(RY5). "L" level during CONVECTION; "H" level otherwise.

16 P52 OUT Cooling fan motor driving signal.

To turn on and off shut-off relay(RY6). "L" level during both microwave and convection cooking; "H" level otherwise.

17 P51 OUT Magnetron high-voltage circuit driving

signal.

To turn on and off the cook relay(RY2). In P-HI operation, the signals holds "L" level during microwave cooking and "H" level while not cooking. In other cooking modes (P-90, P-80, P-70, P-60, P-50, P-40, P30, P-20, P-10, P-0) the signal turns to "H" level and "L" level in repetition according to the power level.

During

VARI MODE ON TIME OFF TIME

P-HI (100% power) 32 sec. 0 sec.

P-90 (approx. 90% power) 30 sec. 2 sec.

P-80 (approx. 80% power) 26 sec. 6 sec.

P-70 (approx. 70% power) 24 sec. 8 sec.

P-60 (approx. 60% power) 22 sec. 10 sec.

P-50 (approx. 50% power) 18 sec. 14 sec.

P-40 (approx. 40% power) 16 sec. 16 sec.

P-30 (approx. 30% power) 12 sec. 20 sec.

P-20 (approx. 20% power) 8 sec. 24 sec.

P-10 (approx. 10% power) 6 sec. 26 sec.

P-0 (0% power) 0 sec. 32 sec.

cooking

OFF

GND

Page 27

DMOC205SS

VMOC205SS

Pin No. Signal I/O Description

18 P50 OUT Damper motor relay driving signal.

To turn on and off shut-off relay(RY4).

OFF

H : GND

19 P47 OUT Heating element driving signal.

To turn on and off shut-off relay(RY3). "L" level during convection cooking; "H" level otherwise. During convection cooking, the signal becomes "H" level when the temperature of the oven cavity

During

cooking

(Convection)

OFF

GND

exceeds the predetermined temperature. 20-21 P46-P45 OUT Terminal not used. 22 P44 OUT Timing signal output terminal for temperature measurement(OVEN THERMIS-

TOR).

"H" level (GND) : Thermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing.(Convection cooking) 23 P43 OUT Signal to sound buzzer.

A: key touch sound.

B: Completion sound.

C: When the temperature of the oven

cavity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is

ß(60Hz)

P03

P02

P01

P00

P37

P36

P35

P55

GND

elapsed.

24 P42 OUT Timing signal output terminal for temperature measurement(OVEN).

"H" level (GND) : Thermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing.(Convection cooking) 25 INT1 IN Signal to synchronize LSI with commercial power source frequency.

This is the basic timing for all real time

H : GN

processing of LSI.

26 P40 IN Connected to GND. 27 RST IN Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Temporarily

set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter

set at "H" level. 28/29 XCIN/XCOUT OUT Terminal not used. 30 XIN IN Internal clock oscillation frequency setting input.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with

respect to XOUT terminal. 31 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XIN. 32 VSS IN Power source voltage: -5V.

VC voltage of power source circuit input. 33 P27 IN Signal coming from touch key.

When any one of G-1 line keys on key matrix is touched, a corresponding signal from

P10 - P17 will be input into P27. When no key is touched, the signal is held at "L" level. 34 P26 IN Signal similar to P27.

When any one of G-2 line key on key matrix is touched, a corresponding signal will

be input into P26. 35 P25 IN Signal similar to P27.

When any one of G-3 line key on key matrix is touched, a corresponding signal will

be input into P25. 36 P24 IN Signal similar to P27.

When any one of G-4 line key on key matrix is touched, a corresponding signal will

be input into P24.

L (-5V)

16.7 msec.

Page 28

DMOC205SS VMOC205SS

Pin No. Signal I/O Description

37 P23 OUT Segment data signals.

The relation between signals and indicators are as follows:

Signal Segment Signal Segment Signal Segment Signal Segment

P23 ............. P1 P17 ............. P5 P13 ............. P9 P07 ........... P13

P22 ............. P2 P16 ............. P6 P12 ........... P10 P06 ........... P14

P21 ............. P3 P15 ............. P7 P11 ........... P11 P05 ........... P15

P20 ............. P4 P14 ............. P8 P10 ...........P12 P04 ........... P16

38-40 P22-P20 OUT Segment data signal.

Signal similar to P23.

41 P17 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-12 line keys on key matrix is touched.

42 P16 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-11 line keys on key matrix is touched.

43 P15 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-10 line keys on key matrix is touched.

44 P14 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-9 line keys on key matrix is touched.

45 P13 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-8 line keys on key matrix is touched.

46 P12 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-7 line keys on key matrix is touched.

47 P11 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-6 line keys on key matrix is touched.

48 P10 OUT Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while one of G-5 line keys on key matrix is touched.

49-53 P07-P03 OUT Segment data signal.

Signal similar to P23.

54-56 P02-P00 OUT Digit selection signal.

Signal similar to P55.

57-59 P37-P35 OUT Digit selection signal.

Signal similar to P55.

60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

Page 29

ABSOLUTE HUMIDITY SENSOR CIRCUIT

SW2

SW1

SW3

SW4

SW5

P30

P31

P32

P33

P34

LSI (IC1)

AN7

AN6

620k

300k

150k

75k

37.4k

47k

10k

0.01µF

0.015µF

0.01µF

360k

VA : -15V

R51

F-2

1.8k

F-1

F-3

3.57k

3.32k

VC : -5V

0.1

µF

C. Thermistor in closed vesssl S. Thermistor in open vessel

IC2(IZA495DR)

DMOC205SS VMOC205SS

(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.

Sensing part (Closed vessel)

Cross section view

Thermistor element

Sensor case

Ventilation openings

View of sensor case removed

Sensing part (Open vessel)

Sensing part (Closed vessel)

Sensing part (Open vessel)

Thermistor element

(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 150οC (302οF), the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show 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 increases. Since the output is very minute, it is amplified by the operational amplifier.

Absolute humidity vs,

Operational amplifier

S : Thermistor open vessel

C : Thermistor closed vessel

Output voltage

output voltage characterist

Absolute humidity (g/m )

than the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal. 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 R50-1. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN7 terminal of the LSI. The voltage of AN6 terminal will indicate about -2.5V. 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 AN6 terminal of the LSI. Then the LSI observes that voltage at AN6 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 AN6 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) Absolute humidity sensor circuit

(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

Page 30

DMOC205SS VMOC205SS

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.

approx. 1M ohm

2. Shapes of Electronic Components

Transistor

DTA123ES KRA101M KRA223M KRC243M

Transistor 2SB910M

3. 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 PRESENTS A HAZARD.

Therefore, when checking the performance of the touch control panel, put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be insulated with an insulating tape. After servicing, be sure to replace the leads to their original locations.

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, therefore, 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 brings about 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 brings about 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).

4. 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

5. Other Precautions

1) Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity.

2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

3) After aluminum 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.

Page 31

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE.

DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING AFTER REMOVING OUTER CASE.

WARNING FOR WIRING

DMOC205SS VMOC205SS

To prevent an electric shock, take the following manners.

1. Before wiring,

1) Disconnect the power supply.

2) Open the door and wedge the door open.

3) Discharge the high voltage capacitor and wait for 60 seconds.

2. Don’t let the wire leads touch to the followiong parts;

1) High voltage parts: Magnetron, High voltage transformer, High voltage capacitor and High voltage rectifier assembly.

2) Hot parts: Convection heater, Oven lamp, Magnetron, High voltage transformer and Oven cavity.

OUTER CASE REMOVAL

To remove the components, procedure as follows.

1. Disconnect oven from power supply.

2. Remove screws from rear and along the side edge of case.

3. Slide the entire case back out about 1 inch (3 cm) to free

POWER TRANSFORMER REMOVAL

3) Sharp edge: Bottom plate, Oven cavity, Weveguide 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 certainly until its pin is locked. And make sure that the wire leads should not come off even if the wire leads is pulled.

5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.

it from retaining clips on the cavity face plate.

4. Lift entire case from the unit. CAUTION: DISCONNECT OVEN FROM POWER SUPPLY

BEFORE REMOVING OUTER CASE.

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Disconnect filament leads of transformer from the magnetron and capacitor.

4. Disconnect high voltage lead of capacitor from the transformer.

5. Disconnect wire leads from the transformer.

6. Remove two (2) screws holding the transformer to the base cabinet.

Re-install

1. Rest the transformer on the base cabinet with its primary terminals toward rear cabinet.

2. Insert the two edges of the transformer into two metal tabs of the base cabinet.

MAGNETRON REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge the high voltage capacitor. Disconnect filament lead of transformer from magnetron. Disconnect high voltage wire lead from magnetron.

3. Carefully remove four (4) mounting screws hold the magnetron to waveguide, when removing the screws holding the magnetron to prevent it from falling.

3. Make sure the transformer is mounted correctly to the corners underneath those tabs.

4. After re-installing the transformer, secure the transformer with two screws to the base cabinet, one is with outer tooth washer and the other is without outer-tooth washer.

5. Re-connect the wire leads (primary and high voltage) and high voltage lead to the transformer and filament leads of transformer to the magnetron and capacitor, referring to the “Pictorial Diagram”.

6. Re-install the outer case and check that the oven is operating properly.

NOTE HOT (ORANGE) WIRE MUST BE CONNECTED

TO THE POWER TRANSFORMER TERMINAL NEAREST TO THE TRANSFORMER MOUNTING SCREW.

4. Remove the magnetron from the unit with care so the magnetron tube should not hit by any metal object around the tube.

CAUTION: WHEN REPLACING THE MAGNETRON, BE

SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

Page 32

DMOC205SS VMOC205SS

HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge the high voltage capacitor.

3. Remove one (1) screw holding the rectifier assembly to the capacitor holder.

4. Disconnect the rectifier assembly from the capacitor

HIGH VOLTAGE CAPACITOR REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge the high voltage capacitor.

3. Disconnect the high voltage wire leads and rectifier assembly from high voltage capacitor and magnetron.

4. Disconnect filament lead of transformer from high voltage capacitor.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

Push the lever of positive lock® connector. Pull down on the positive lock® connector.

CAUTION: WHEN YOU CONNECTING THE POSITIVE

LOCK® CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU.

and magnetron.

CAUTION: WHEN REPLACING THE SILICON RECTIFIER

ASSEMBLY, THE GROUND SIDE TERMINAL MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

5. Disconnect high voltage wire lead of capacitor from transformer.

6. Remove one (1) screw and washer holding the rectifier from the capacitor holder.

7. Remove one (1) screw holding the capacitor holder to the rear cabinet.

8. Remove the capacitor from the holder.

Terminal

Positive lock® connector

Lever

Push

Pull down

CONVECTION MOTOR REMOVAL

Disconnect oven from power supply and remove outer case.

2. Discharge the high voltage capacitor.

3. Disconnect wire leads from the convection motor. Remove the convection fan belt.

4. Remove two (2) screws holding the convection motor mounting angle to the heater duct and base cabinet.

TURNTABLE MOTOR REMOVAL

1. Disconnect the oven from power supply. Remove the turntable tray, and the turntable support out of the oven cavity.

2. Turn the oven upside down and remove one (1) screw holding the turntable motor cover to the base plate and take off the turntable motor cover.

DAMPER ASSEMBLY REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge the high voltage capacitor.

3. Disconnect wire leads from damper motor and damper switch.

4. Remove two (2) oven side screws holding damper motor

Figure C-1. Positive lock®connector

5. Take out the convection motor assembly from the unit. The convection motor assembly is now free.

6. Remove two (2) screws and nuts holding the motor to mounting angle.

7. Remove pulley (M) from the motor shaft. Convection motor is now free.

3. Disconnect wire lead from the turntable motor.

4. Remove the two (2) screws holding the turntable motor and coupling mounting plate to the oven cavity bottom.

5. Turntable motor, Coupling mounting plate and Thermal protection plate bottom will be free.

angle to thermal protection plate (right).

5. Damper assembly is free.

6. Remove one (1) screw holding damper motor to damper motor angle and one (1) screw holding damper switch to damper motor angle.

7. Damper motor and switch are free.

Page 33

HEATER UNIT ASSEMBLY REMOVAL

Long nose plier

Heating element holder

Heating element

(HEATING ELEMENT/CONVECTION FAN/CONVECTION MOTOR/THERMISTOR)

DMOC205SS VMOC205SS

THERMISTOR REMOVAL

1. Disconnect oven from power supply and remove outer case cabinet.

2. Discharge the high voltage capacitor. Disconnect wire leads from H.V. capacitor and remove four (4) screws holding rear cabinet to bottom plate and three (3) screws holding to heater unit assembly and two (2) screws holding steam duct to top of oven cavity. Disconnect wire leads from power supply cord terminals.

3. Disconnect wire leads from thermistor. Remove two (2) screws from thremistor.

4. Disconnect wire leads from convection motor, thermal cut-out and heater element.

5. Remove nine (9) screws holding heater duct to the oven cavity.

6. Remove two (2) screws holding heater duct to base cabinet. Release two (2) snap bands holding wire harness to the thermal cover (convection).

7. The heater unit is now free.

OVEN LAMP AND LAMP SOCKET REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Bend the tab of the air guide holding the lamp socket.

4. Lift up the oven lamp socket.

5. 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. Now, the oven lamp socket is free.

HEATING ELEMENT REMOVAL

1. Remove two (2) screws holding heating element to heater duct.

2. Loosen two (2) screws holding holders to heater duct and take heating element out of heating element holders.

3. Heating element is free.

NOTE: After installed the heating element completely,

bent top of the heating element holder to inside using by long nose pliers as shown following illustration.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Figure C-2. Oven lamp socket

FAN MOTOR REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Disconnect the wire leads from the fan motor.

4. Remove one (1) screw holding the fan motor grounding wire to the air guide (Right).

5. Remove three (3) screws holding the chassis support to the rear cabinet, waveguide and control panel back plate.

6. Remove the chassis support from the oven.

7. Remove one (1) screw holding the magnetron air guide to the waveguide.

8. Remove the magnetron air guide from the waveguide.

9. Disconnect wire leads from the fan motor.

10. Release the main harness from the hole of the fan duct.

11. Release the thermistor harness from the hole of the fan duct.

12. Release one (1) tab holding the fan duct to the rear cabinet.

13. Release one (1) tab holding the fan duct to the air guide (Right).

14.Remove the fan duct assembly from the oven.

15.Remove the fan blade from the fan motor shaft according the following procedure.

1) Hold the edge of the rotor of the fan motor by using a pair of grove joint pliers.

CAUTION: * Make sure that any pieces do not 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.

2) Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand.

3) Now, the fan blade will be free.

CAUTION: * Do not use this removed fan blade again because the

hole (for shaft) of it may become bigger than a standard one.

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DMOC205SS VMOC205SS

16.Remove the two (2) screws and nuts holding the fan motor to the fan duct.

17.Now, the fan motor is free.

INSTALLATION

1. Install the fan motor to the fan duct with the two (2) screws and nuts.

2. Install the fan blade to the fan motor shaft according the following procedure.

1) Hold the center of the bracket which supports the shaft of the fan motor on the flat table.

2) Apply the screw lock tight into the hole (for shaft) of the fan blade.

3) 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

Coil

Groove joint pliers

Stator

Gap

Bracket

Rear View

Rotor

Axis

Shaft

Stator

Rotor

Side View

These are the positions that should be pinched with pliers.

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.

3. Reset the fan duct assembly to its place.

4. Install the tabs of fan duct to the rear cabinet and air guide.

5. Install the magnetron air guide with the one (1) screw.

6. Reinstall the main harness and thermistor harness to each hole of the fan duct.

7. Reinstall the chassis support to the control panel back plate, waveguide and rear cabinet with the three (3) screws.

8. Re-connect the wire leads to the fan motor, referring to the pictorial diagram.

9. Re-install the fan motor grounding wire to the air guide (Right) with one (1) screw.

Shaft

Table

Center of bracket

POWER SUPPLY CORD REPLACEMENT

Removal

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Disconnect the white and black wires of the power supply cord from the noise filter.

4. Remove the one (1) screw holding the earth wire of the power supply cord to the base cabinet.

5. Remove the power supply cord from the rear cabinet.

Re-install

1. Insert the power supply cord into the rear cabinet.

2. Connect the white and black wires of the power supply cord into the terminal of noise filter, referring to the Pictorial Diagram.

3. Re-install the earth wire of the power supply cord to the base cabinet with the one (1) screw.

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

To remove the control panel, procedure as follows:

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Disconnect connector CN-A, CN-E and CN-F from the control unit.

4. Disconnect the wire leads from the relays RY1, RY2 and RY3.

5. Remove one (1) screw holding the control panel back plate to the chassis support.

6. Remove two (2) screws holding the bottom edge of the back plate to the cabinet base.

7. Remove one (1) screw holding the back plate to the oven

GRY

White wire

Black wire

Green wire

Power supply cord

Rear Cabinet

Base Cabinet

Noise filter

RED

Figure C-3. Power supply cord replacement

cavity flange.

8. Lift up and pull the control panel assembly forward. Replacement of individual component is as follows;

CONTROL UNIT AND KEY UNIT

1. Disconnect the wire connector from the control unit.

2. Remove the four (4) screws holding the panel frame to the back plate.

3. Separate the panel frame and back plate.

4. Remove the three (3) screws holding the control unit to the panel frame.

5. Lift up the control unit and disconnect the key connector from the control unit.

Page 35

DMOC205SS

LATCH HOOK

LATCH HEADS

DOOR SENSING SWITCH

MONITOR SWITCH

PRIMARY INTERLOCK SWITCH

SWITCH LEVER

OPEN LEVER

DOOR OPEN BUTTON

THIRD DOOR SWITCH

VMOC205SS

6. Now, the control unit and frame assembly are separated. NOTE; 1. Before attaching a new key unit, remove

remaining adhesive on the control panel frame surfaces completely with alcohol and so on.

2. When a attaching the key unit to the control

panel frame, adjust the lower edge and right edge of the key unit to the correct position of the control panel frame.

3. Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch.

THIRD DOOR SWITCH, DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH

REMOVAL

1. Disconnect oven from power supply and remove outer case.

2. Discharge high voltage capacitor.

3. Remove the control panel assembly, refer to "Control Panel Removal".

4. Disconnect wire leads from each of the switches and fuse holder.

5. Remove two (2) screws holding latch hook to oven flange.

6. Remove latch hook assembly from oven flange.

7. Push outward on the one (1) stopper tabs holding each

and check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure.

of switches place.

8. Switch is now free. At this time switch lever will be free, do not lose it.

Re-install

1. Re-install switch lever and each interlock switch in its place. The primary interlock switch is in the lower position and the door sensing switch and thir door switch are in the upper position and the monitor switch is in the middle position.

2. Re-connect wire leads to each switches and fuse holder. Refer to pictorial diagram.

3. Secure latch hook (with two (2) mounting screws) to oven flange.

4. Make sure that the monitor switch is operating properly

THIRD DOOR SWITCH, DOOR SENSING SWITCH, PRIMARY

INTERLOCK SWITCH AND MONITOR SWITCH

ADJUSTMENT

If the door sensing switch, third door switch, primary interlock switch and monitor switch do not operate properly

latched position.

2. The door sensing switch and primary interlock switch interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. The third door switch contacts open when the door is opened.

due to a misadjustment, the following adjustment should be made.

1. Loosen the two (2) screws holding latch hook to the oven cavity front flange.

2. 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 latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and primary interlock switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plungers of the monitor switch and the third door switch are pressed with the door closed.

3. Secure the screws with washers firmly.

4. Check the all switches operation. If each switch has not activated with the door closed, loosen the screw and adjust it.

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm at the

5. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

DOOR REPLACEMENT AND ADJUSTMENT

REMOVAL

1. Disconnect oven from power supply and remove the outer case. Remove turntable tray and turntable support from oven cavity.

2. Remove three (3) screws holding lower oven hinge.

3. Remove the lower oven hinge from oven cavity bottom flange.

4. Remove door assembly from upper oven hinge on the oven.

5. Door assembly is now free.

Note: When the individual parts are replaced, refer to

6. On re-installing door, insert the upper oven hinge into the door hinge pin. Then while holding door in place.

Figure C-4. Latch Switch Adjustments

"Door Disassembly".

Page 36

DMOC205SS VMOC205SS

7. Make sure the door is parallel with oven face lines (left and upper side lines) and door latch heads pass through latch holes correctly.

8. Insert the lower oven hinge into oven cavity bottom flange and then engaged the door hinge pin. Then secure the lower oven hinge firmly with tree (3) mounting screws.

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.

DOOR ADJUSTMENT

The door can be adjusted by keeping screws of each hinge loose.

After adjustment, 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. Re-install outer case and 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. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

UPPER OVEN HINGE

RE-INSTALL

DOOR ASSEMBLY

LATCH HEADS

LOWER OVEN HINGE

RE-INSTALL

Figure C-5. Door Replacement and adjustment

DOOR DISASSEMBLY

Remove door assembly, refer to "Door Replacement". Replacement of door components are as follows:

1. Place door assembly on a soft cloth with latches facing up.

Note: As the engaging part of choke cover and door panel

are provided at several places, do not force any particular part.

2. Insert an putty knife (thickness of about 0.5mm) into the gap between the choke cover and corner portion of door panel as shown Figure C-6 to free engaging parts.

3. Lift up choke cover.

4. Now choke cover is free from door panel.

1 BENT

CHOKE COVER

2 LIFT UP

PUTTY KNIFE

Bent

Door Panel

Upper

Figure C-6. Door Disassembly

INSIDE

FRONT

Choke cover

Lower

Page 37

MICROWAVE MEASUREMENT PROCEDURE

DMOC205SS VMOC205SS

After adjustment of the door, interlock and monitor switches are completed individual or collectively, interlock switch test and microwave leakage test must be performed with survey instrument and test results must be confirmed to meet the requirement of the performance standard for microwave ovens as undermentioned.

Requirement

Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with it’s 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, 275±15ml of water at an initial temperature of 20±5οC.

2. 5.0mW/cm2 when the outer enclosure is removed with a test load of 275±15ml water at an initial temperature of 20±5οC.

3. 5.0mW/cm2 without a test load.

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.

Note: 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.

Leakage test:

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 2.5cm/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).

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 does turn the oven OFF before any door movement.

Leakage Test without Enclosure.

1. Remove the enclosure (cabinet).

2. Grasp the probe of the survey meter and hold it perpendicular to all mechanical and eleeectronic parts of the oven that is accessible to the user of the oven including, but not limited to, the waveguide, cavity, cavity seams, magnetron and magnetron to waveguide connection.

3. Move the probe slowly (not faster than 2.5cm/sec.), watching for the maximum indication on the meter.

4. Measure carefully at the point of highest leakage and make sure that the highest reading is under the required limit as mentioned above.

Recommended instruments are:

NARDA 8100 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±5οC 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 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. Close the door and set the time cooking for several minutes. And start the oven. If the water load is depleted replace it.

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 mesure the leakage by the same method as the above test procedure “A. Test Enclosure Installed”.

2. Make sure that the highest leakage should not exceed 5mW/cm2.

Note: Do not perform this test for extended periods.

Page 38

DMOC205SS VMOC205SS

RED

BLK

HIGH VOLTAGE COMPONENTS

MAGNETRON

PNKBLK

GRY

MAGNETRON

THERMAL

CUT-OUT

HIGH VOLTAGE

CAPACITOR

POWER TRANSFORMER

GRY

ORG

CONV.

THERMAL

CUT-OUT

COOLING

FAN

MOTOR

NOTE:

Hot (ORG) wire must be connected to the

power transformer terminal nearest to the

transformer mounting screw.

ORG

PNK

PPL

RED

POWER SUPPLY CORD

BLK

WHT

GRN

RED

GRY

WHT

BLK

NOISE FILTER

AND FUSE

BRN

GRY

DAMPER

OVEN

THERMAL

CUT-OUT

BLK BLK

OVEN LAMP

& SOCKET

WHT

PNK

BLUE MARK

NOTE:

Hot (YLW & PNK) wire

must be connected to the

terminal with blue mark

on the oven light socket.

DAMPER

SWITCH

N.O.

PNK

COM

PNK

WHT

MOTOR

CONVECTION MOTOR

HEATING

ELEMENT

GRY

RED

GRY

PNK

TURNTABLE

MOTOR

RED

THERMISTOR

Figure S-1. Pictorial Diagram

GRN

BRN

ORG

MONITOR

GRY

WHT

GRY

THIRD

DOOR

GRY

SWITCH

COM

N.O.

AH SENSOR

N.O.

DOOR

SENSING

GRN

ORG

COM

SWITCH

CN-E

PNK

WHT

PNK

N.C.

RED

CN-E

SWITCH

COM

ORG

GRN

12345

RED

BRN

RY3 (N.O.)

RY3 (COM.)

362

ORG

BRN

RY2 (N.O.)

RY2 (COM.)

BLK

RED

RY1 (COM.)

RY1 (N.O.)

PNK

ORG

BRN

CN-A

123456789

IC-1

BLK

CN-F

RED

123

WHT

CONTROL PANEL

CN-G

CN-F

COM.

N.O.

RY5

RY4

13579

RY1

RY2

RY3

N.O.

CN-A

PPL

RY6

RED

COM

PRIMARY

INTERLOCK

SWITCH

WHT

Page 39

DMOC205SS VMOC205SS

CLEAR

TOUCH ON

LEVEL

KEY UNIT

1 G

C70 330pF x 4

D30

AH SENSOR

E 1 E 2 E 5 E 6 E 3 E 4 F 1 F 2 F 3

OVEN

THERMISTOR

DAMPER

SWITCH

Figure S-2. Control Panel Circuit

DOOR

SWITCH

: IF NOT SPECIFIED. 0.01µ/16v

: IF NOT SPECIFIED. 1SS270A

NOTE : IF NOT SPECIFIED. 1/4w ± 5%

R11 18 1w

R10 18 1w

CONTROL UNIT

/25v 22µ

–

C11

D1-4 : 11ES1

10G471K

VRS1

DTA123ES

HZ5C2

ZD3

HZ16-1

ZD2

C10 0.1µ/50v

C6 10µ/35v

–

C5 0.1µ/50v

C4 10µ/35v

–

C3 0.1µ/50v

C2 1000µ/35v

–

C1 0.1µ/50v

(J1)

R7 4.7k

HZ4A2

ZD4

470 1/2w

A 9

FLUORESCENT DISPLAY TUBE

MIX CONV

31, 32

FF8G

(VP)

R90 100k

R8 4.7k

R4 750 1/2w

2SB1238

R3 330 1/2w

Q20

KRA101M

RY4

A 7

A 1

P2 P3

P6 9

P7 10

P8 11

P9 12

P10

P11

P12

P13

COOK LBS OZ KG HELP

P14

P15

P16

1G 22

2G 23

3G 24

4G 25

5G 26

6G 27

(VP)

IC2 IZA495DR

C9 0.01µ/50v

Q40

Q22

RY5

A 3

7G 28

KRA101M

RY6

A 5

100k

R100 330 1w

P30

P31

P32

VEE

VCC 1

AVSS

(J7)

(J3)

(J6)

(J2)

D23

R93

R92

R91

P33

P34

AN7

VREF

(J5) 6.8k

(J4) 15k

P35

P36

AN6

AN5

RY2

DEFROST

SENSOR

1, 2

Q90

KRA101M

R40 3.3k

SP40

Q21

KRA101M

D20D21D22D24

P37

P00

P01

P02

P03

P04

P55

AN4

AN3

AN2

AN1

AN0

Q24

KRA223M

N O

COM

3.3k D77

R81

ROAST

D76

D75

D74

D73

D72

D71

D70

R64 3.3kF

KRA101M

Q26

KRC243M

G10 G11 G

8G 9

G 7 G

6 G

5 G

R73 3.3k

R72 3.3k

R71 3.3k

R70 3.3k

C30 C50 C60

HIGH MIX

BROIL

BAKE

CONVEC

ROAST

CONVEC

BROIL

CONVEC

COOK

SENSOR

DEFROST

ADD-A-

MINUTE

4 G

CF1 4.19MHz

12345

R62 27kF

R63 220F

R51 4.7k

R50 15k

R30 15k

P05

P06

P07

P10

P54

P53

P52

P51

Q25

RY3

N O

P11

P12

P13

P14

P15

P16

P17

P50

P47

P46

P45

P44

P43

P42

–

KRA223M

D25D26

RY1

N O

COM

P20

P21

P22

P23

P24

P25

P26

P27

IC1 IXA103DR

32 33

XIN

P40

RST

XCIN

XCOUT

C21 0.1µ/50v

–

VSS

XOUT

Q23

C20 10µ/35v

C22 0.1µ/50v

INT1

COM

3.3k

R80

3.3k

R79

3.3k

R78

3.3k

R77

3.3k

R76

3.3k

R75

3.3k

R74

67890

100°F 150°F 275°F 300°F 325°F

MIX

CONVEC

LOW

SLOW

PREHEAT

REHEAT

POPCORN

(A) (B) (C)

R31 4.7k

350°F 375°F 400°F 425°F 450°F

BAKE

COOK

D31

STOP

START

CLOCK

TIMER POWER

HELP

DAMPER

AC120V

60Hz

MOTOR

CONV.

MOTOR

FAN

MOTOR

POWER

TRANSFORMER

HEATING

ELEMENT

OVEN LAMP

TURNTABLE

MOTOR

Page 40

DMOC205SS VMOC205SS

DIP

Q90

R80

COM

R81

R73

R72

33 64

R71 R70

D70 D71 D72 D73 D74 D75 D76

IC1

D77

R79

R78

R77 R76

R75

R74

R100

IC2

CN - F

D25

D24

C70

(ONLY 9X58PJ)

(CN - G)

CN - G

CONV HEATER

RED BRN

POWER TRANS

RY3

ORG

RY2

PINK RED (BRN

RED)

OL TTM

RY1

POWER

BLK

RY5

DAMP M CONV M FAN M POWER

1357 9

D20

RY4

VRS1

R91

R92

R93

10 11 12

(J7)

C30

(J5)

C50

(J3)

C60

(J2) (J4)

(J6)

R30

R31

R51

C21

Q25

Q24

D23

Q23

D26

D21

C22 C1

Q26

Q21

Q22

Q20

R50

(R85)

R64

R63

S1 S2

R90

CF1

(R46)

Q40

C20

C10

(C81)

R86(J8)

(C80)

(R45)

ZD4

(R47)

R40

R62

D31 D30

45 78

(CF1)

(CN - D)

(R48)

ZD2

PHR)

(C46)

IC3

CN - E

(C45)

(R49)

(C47)

654321

(ONLY

ZD3

TEMP

DAMP

OVEN

DOOR

(J1)

CN - A

D22

RY6

C11

R10

R11

Figure S-3. Printed Wiring Board

Page 41

PARTS LIST

•Refer to "IMPORTANT" described at end of parts list.

REF. NO. PART NO. DESCRIPTION Q'TY

ELECTRICAL PARTS

1- 1 FACCDA074WRE0 Power supply cord 1 1- 2 FFS-BA012WRK0 1- 3 FPWBFA293WRK0 Noise filter 1 1- 4 QSW-MA110WRE0 1- 5 FH-HZA041WRE0 Thermistor 1 1- 6 QSW-MA110WRE0 Damper switch 1 1- 7 RTHM-A116WRE0 Magnetron thermal cut-out 125 1- 8 RTHM-A085WRE0 Oven & Convection thermal cut-out 150 1- 9 RMOTDA192WRE0 Damper motor 1 1-10 RLMPTA077WRE0 Oven lamp 1 1-10 RLMPTA027WRE0 Oven lamp (Interchangeable) 1 1-11 QSOCLA021WRE0 Oven lamp socket 1 1-13 RMOTEA283WRE0 Convection fan motor 1 1-14 RMOTEA300WRE0 Fan motor 1 1-15 RHET-A136WRE0 Heating element 1 1-16 RTRN-A527WRE0 Power transformer 1 1-17 RC-QZA173WRE0 H.V.capacitor 1 1-17 RC-QZA211WRE0 H.V.capacitor (Interchangeable) 1 1-18 FH-DZA053WRK0 H.V.rectifier assembly 1 1-19 RV-MZA222WRE0 Magnetron 1 1-19 RV-MZA114WRE0 Magnetron (Interchangeable) 1 1-20 RMOTDA222WRE0 Turntable motor 1 1-21 FDTCTA183WRK0 AH sensor assembly 1

2- 1 GCABUA721WRP0 Outer case cabinet 1 2- 2 TMAPCA733WRR0 Schematic diagram 1 2- 3 FDAI-A180WRY0 Base cabinet (Not Replaceable) 1 2- 4 GLEGPA019WRE0 Foot 4 2- 5 GCABDA088WRW0 Rear cabinet (Not Replaceable) 1 2- 6 LHLDKA009WRF0 Cord holder 1 2- 7 LBNDKA036WRP0 Capacitor holder 1 2- 8 FHNG-A320WRMZ Oven hinge (Lower) 1 2- 9 PHOK-A112WRF0 Latch hook 1 2-10 MLEVPA131WRF0 Switch lever 1 2-11 GCOVHA347WRP0 Turntable motor cover 1 2-12 PCOVPA171WRP0 CSA barrier 1

3- 1 DPWBFC189WRUZ Control unit 1 3- 2 FPNLCB458MRK0 Control panel frame with key unit (DMOC205SS) 1 3- 2 FPNLCB459MRK0 Control panel frame with key unit (VMOC205SS) 1 3- 2-1 FUNTKA393WRE0 Key unit (DMOC205SS) 1 3- 2-1 FUNTKA394WRE0 Key unit (VMOC205SS) 1 3- 2-2 JBTN-B164WRF0 Open button (DMOC205SS) 1 3- 2-2 JBTN-B165WRF0 Open button (VMOC205SS) 1 3- 2-3 MSPRCA045WRE0 Open button spring 1 3- 3 LANGTA340WRW0 Control panel back plate 1 3- 4 FANGTA093WRK0 Open lever 1 3- 5 NSFTTA042WRE0 Open shaft 1 3- 6 XEPSD30P10XS0 Screw ; control unit mtg. 3 3- 7 XCPSD40P12000 Screw ; control panel back plate mtg. 3 3- 8 LX-CZB019MRE0 Screw ; control panel mtg. 2 3- 9 XOTSD40P12RV0 Screw ; power unit assy 2

4- 1 FOVN-A314WRY0 Oven cavity assembly (Not Replaceable) 1 4- 2 FROLPA072WRK0 Turntable support 1 4- 3 NTNT-A019WRH0 Turntable tray 1 4- 4 FBRGMA002WRE0 Bearing ass’y 1 4- 5 PREFHA028WRW0 Thermal protection plate (left) 1 4- 6 LANGTA196WRW0 Bearing mounting plate 1 4- 7 LBNDK0054WRE0 Heater element holder 2 4- 8 LFIX-A013WRW0 Bearing holder plate 1 4- 9 NFANMA019WRW0 Convection fan 4-10 NPLYBA020WRF0 Pulley (F) 1 4-11 FDUC-A279WRK0 Heater duct assembly 1 4-12 PFPF-A138WRE0 Thermal protection sheet (left) 1 4-13 LANGKA723WRP0 Glass mounting plate 1 4-14 PCUSUA167WRP0 Cushion 2 4-15 PCUSUA424WRP0 Cushion 1

Monitor fuse 20A and monitor switch (V-5220D-070) assembly

Primary interlock switch/Thirdoor switch/Door sensing switch

CABINET PARTS

CONTROL PANEL PARTS

OVEN PARTS

DMOC205SS VMOC205SS

Page 42

DMOC205SS VMOC205SS

REF. NO. PART NO. DESCRIPTION Q'TY CODE

4-16 FDUC-A323WRW0 Steam duct assembly 1 AY 4-17 MCAMPA030WRF0 Damper cam 1 AC 4-18 NSFTTA114WRE0 Damper shaft 1 AB 4-19 FFTA-A034WRK0 Damper door ass’y 1 AM 4-20 PDUC-A269WRW0 Damper duct 1 AK 4-21 PCUSGA398WRP0 Cushion 1 AC 4-22 NCPL-A021WRF0 Turntable coupling 1 AE 4-23 PCOVPA301WRE0 Waveguide cover 1 AE 4-24 PCUSUA197WRP0 Cushion 2 AD 4-25 PGLSPA455WRE0 Light glass 1 AD 4-26 PFPF-A139WRE0 Thermal protection sheet (Right) 1 AF 4-27 PREFHA053WRW0 Thermal protection plate (Right) 1 AP 4-28 PSKR-A153WRW0 Air guide (Bottom) 1 AK 4-29 PSKR-A323WRW0 Air guide (Right) 1 AF 4-30 LANGQA407WRW0 Convection motor mounting plate 1 AG 4-31 NPLYBA021WRF0 Pulley (M) 1 AC 4-32 NFANJA020WRE0 Fan blade 1 AE 4-33 PDUC-A270WRF0 Cooling fan duct 1 AL 4-34 LANGFA089WRW0 Chassis support 1 AE 4-35 MHNG-A520WRMZ Oven hinge (Upper) 1 AE 4-36 NBLTKA005WRE0 Convection fan belt 1 AF 4-37 LANGQA474WRP0 Noise unit angle 1 AG 4-38 PCUSUA196WRP0 Cushion 2 AD 4-39 PCUSUA425WRP0 Damper duct cushion 1 AG 4-40 PCUSGA353WRP0 Cushion 1 AH 4-41 PSKR-A171WRW0 Magnetron air guide 1 AE 4-42 PFPF-A064WRE0 Thermal protection sheet 1 AF 4-43 PCOVPA304WRP0 Thermo cover 1 AF

DOOR PARTS

5 FCOV-B255MRK0 Door panel assembly complete (DMOC205SS) 1 BT 5 FCOV-B254MRK0 Door panel assembly complete (VMOC205SS) 1 BT 5- 1 DDORFA820WRY0 Door panel 1 BD 5- 2 GCOVHA155WRF0 Choke cover 1 AP 5- 3 LANGKA851WRT0 Latch angle 1 AF 5- 4 LSTPPA169WRF0 Latch head 1 AH 5- 5 MSPRTA081WRE0 Latch head spring 1 AA 5- 6 LANGKA918WRW0 Thermal plate U 1 AA 5- 7 LANGKA919WRW0 Thermal plate R 1 AA 5- 8 XCPSD40P08000 Screw; 4mm x 8mm 6 AA 5- 9 XEPSD30P08000 Screw; 3mm x 8mm 12 AA 5-10 PCUSGA537WRPZ Cushion 1 AD

MISCELLANEOUS

6- 1 FAMI-A088WRM0 Low rack (Broiling trivet) 1 AW 6- 2 FAMI-A087WRM0 High rack (Baking rack) 1 AW 6- 3 FW-VZB342WRE0 Thermistor harness 1 AN 6- 4 FW-VZB604WRE0 Main wire harness 1 BB 6- 5 QW-QZA198WRE0 High voltage wire B 1 AN 6 -6 QW-VZA108WRE0 Grounding wire (Cooling fan motor) 1 AF 6- 7 TCAUAA196WRR0 Monitor caution label 1 AB 6- 8 TCAUAB034MRR0 NHW caution label 1 AD 6- 9 TINSEB363MRR0 Operation manual (DMOC205SS) 1 AQ 6- 9 TINSEB364MRR0 Operation manual (VMOC205SS) 1 AQ 6-10 LHLDWA013WRE0 Purse lock LL 1 AC 6-11 TCAUHB008MRR0 User caution 1 AH 6-12 TCAUSB012MRR0 BIK label 1 AH 6-13 TCAUAB048MRR0 GND caution label 1 AH 6-14 TINSEB322MRR0 S/S cleaning instructions 1 6-15 TCADCB016MRR0 Cook book 1 6-16 TCAUAB033MRR0 UL screw label 1

SCREWS NUTS AND WASHERS

7- 1 XOTWW40P10000 Screw; 4mm x 10mm 14 AA 7- 2 XOTSE40P12000 Screw; 4mm x 12mm 4 AA 7- 3 XCTWW40P08000 Screw; 4mm x 8mm 2 AA 7- 4 XHTSD40P08RV0 Screw; 4mm x 8mm 4 AA 7- 5 LX-CZ0052WRE0 Special screw 2 AA 7- 6 XWVSD60-07000 Washer; 6mm x 0.7 mm 1 AA 7- 7 LX-WZA004WRE0 Washer 1 AA 7- 8 LX-CZA020WRE0 Special screw 6 AA 7- 9 XBPSD30P14K00 Screw; 3mm x 14mm 1 AA 7-10 XBPSD40P25000 Screw; 4mm x 25mm 2 AA

Page 43

DMOC205SS VMOC205SS

REF. NO. PART NO. DESCRIPTION Q'TY CODE

7-11 XBTWW40P06000 Screw; 4mm x 6mm 7 AA 7-12 XCTSD40P08000 Screw; 4mm x 8mm 7 AA 7-13 LX-NZ0029YBE0 Special nut 1 AA 7-14 XBPSD40P06KS0 Screw; 4mm x 6mm 2 AA 7-15 LX-WZA022WRE0 Washer 1 AB 7-16 LX-BZ0531FCZZ Screw; 4mm x 8mm 6 AA 7-17 XCPSD30P06000 Screw; 3mm x 6mm 3 AA 7-18 LX-CZA038WRE0 Special screw 1 AA 7-19 XFPSD40P08K00 Screw; 4mm x 8mm 3 AA 7-20 XBPSD40P06000 Screw; 4mm x 6mm 1 AB 7-21 XCBWW30P06000 Screw; 3mm x 6mm 4 AA 7-22 XFPSD40P08000 Screw; 4mm x 8mm 6 AA 7-23 XFPSD60P14JS0 Screw; 6mm x 14mm 2 AB 7-24 XOTSD40P12000 Screw; 4mm x 12mm 21 AA 7-25 XFPSD30P08000 Screw; 3mm x 8mm 2 AA 7-26 XNESD40-32000 Nut; 4mm x 3.2mm 2 AA 7-27 XNEUW40-32000 Nut; 4mm x 3.2mm 1 AA 7-28 XWSUW40-10000 Washer; 4mm x 1 mm 1 AA 7-29 LX-CZA070WRE0 Screw; UL 2 AA

Page 44

DMOC205SS VMOC205SS

OVEN AND CABINET PARTS

7-24

7-29

2-1

7-24

4-43

7-29

4-34

1-11

1-10

7-25

1-8

4-5

4-13

4-25

4-24

7-1

7-2

7-24

7-13

7-18

4-42

4-12

7-12

7-16

1-21

2-2

7-22

4-11

6-7

2-6

6-13

4-16

1-18

7-21

4-7

7-2

6-4

4-24

7-16

1-15

7-24

7-8

7-21

7-2

6-8

7-19

4-35

1-7

4-29

1-1

7-24

4-32

6-12

7-4

2-7

7-28

7-21

7-26

1-17

7-16

7-22

6-16

4-9

7-27

7-11

1-5

7-19

6-7

4-33

ASE PLATE B

TO OVEN

4 x

3 x

4-14

4-4

4-8

7-3

7-15

4-6

4-10

1-8

7-17

7-1

4-36

7-14

Page 45

DMOC205SS VMOC205SS

CONTROL PANEL PARTS

3-9

6-11

3-2

3-2-1

3-2-3

3-2-2

3-1

3-3

3-6

3-7

3-4

7-24

3-7

7-24

3-5

5-9

5-2

DOOR PARTS

MISCELLANEOUS

6-1

3-8

VMOC205SS

DMOC205SS

5-11

5-6

5-8

5-10

6-4

5-7

5-1

5-8

5-5

5-3

5-4

6-2

6-3

6-10

Actual wire harness may be different than illustration.

6-5

6-6

Page 46

DMOC205SS VMOC205SS

TOP PAD ASSEMBLY

PLASTIC BAG

BOTTOM PAD ASSEMBLY

MANUAL

DOOR PROTECTION SHEET

MICROWAVE OVEN

PACKING AND ACCESSORIES

6-14 S/S CLEANING INSTRUCTIONS

TRAY HOLDER

4-3 TURNTABLE TRAY

6-9 OPERATION

6-15 COOK BOOK

4-2 TURNTABLE SUPPORT

TRAY PACKING FOAM

PACKING CASE

Not replaceable items.

Page 47

NOTES:

DMOC205SS VMOC205SS

Page 48

DMOC205SS VMOC205SS

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

Viking DMOC205SS, VMOC205SS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual