Sharp R-9H55 Service Manual

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SHARI= SERVICE MANUAL

CONVECTION

MICROWAVE OVEN

-------------_.

MODEL

R-9H55

In interests of user-safety the oven should be restored to its original condi-

TABLE OF CONTENTS

page

GENERAL IMPORTANT INFORMATION

......................................................................................................

WARNING

......................................................................................................................................................

RODUCT SPECIFICATIONS

.........................................................................................................................

APPEARANCE VIEW

.................................................................................................................................... 3

OPERATING SEQUENCE

............................................................................................................................. 4

FUNCTION OF IMPORTANT COMPONENTS’

............................................................................................. 8

TRABLESHOOTING CHART

....................................................................................................................... 11

TEST PROCEDURE

.................................................................................................................................... 14

TOUCH CONTROL PANEL

......................................................................................................................... 24

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

....................................................... .31

MICROWAVE MEASUREMENT .................................................................................................................. 38

WIRING DIAGRAM

......................................................................................................................................

PICTORIAL DIAGRAM

................................................................................................................................

CONTROL PANEL CIRCUIT .......................................................................................................................

PRINTED WIRING BOAD

............................................................................................................................

PARTS LIST ................................................................................................................................................

SHARP CORPORATION

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SERVICE MANUAL

SHARP

MICROWAVE OVEN

R-9H55

GENERAL IMPORTANT INFORMATION

This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.

It is recommended that service engineers- carefully study the entire text of this manual, so that they will be qualified to render satisfactory customer service.

CAUTION

MICROWAVE RADIATION

Service engineers should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges andgaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide.

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 not any other visible damage with the oven.

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

All the parts marked

“*” on parts list are used at voltages more

than 25OV.

Removal of the outer wrap gives access to potentials above

25ov.

SHARP CORPORATION

OSAKA, JAPAN

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PRODUCT SPECIFICATIONS

ITEM

Power Requirements

240 Volts 50 Hertz

DESCRIPTION

Power Consumption

Power Output

Convection heater Case Dimensions

Single phase, 3 wire earthed 1500 W (Microwave) 1600 W (Convection) 750 watts nominal of RF microwave energy (AS 2895 1986) 850 watts (IEC-705-I 988 ) Operating frequency of 2450MHz

1500 w Width 627mm Height 378mm Depth 481 mm

Cooking Cavity Dimensions

Control Complement

Width 41 Omm Height 245mm Depth 41 Omm Touch Control System Clock ( 1:OO - 12:59) Timer (0 - 99 min. 99 sec.) Microwave Power for Variable Cooking

Repetition Rate;

HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Full power throughout the cooking time

MED HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...* approx. 70% of Full Power

MED . . . . . ..*...........................................*................ approx. 50% of Full Power

MED LOW (DEFROST)

. . . . . . . ..*.*..........................

approx. 30% of Full Power

LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx.

10% of Full Power

Convection Temperature for Variable Cooking

CONVECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*............... 40 to 250°C Temp. control

LOW M IX(BAKE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180°C with

10% of microwave power

HIGH MIX(ROAST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200°C with

GRILL

30% of microwave power

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250°C

(Preheat)

SENSOR INSTANT ACTION pads MULTI COOK pad REHEAT SENSOR pad CONVECTION COOKING FUNCTION pads EASY DEFROST pad NUMBER and TEMPERATURE pads

POWER LEVEL pad MORE. LESS pads STOP/CLEAR pad

AUTO START/CLOCK pad

-s

INSTANT COOK/START pad

Set Weight

Approx. 30 kg

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APPEARANCE VIEW

1. Ventilation opening

2. Oven lamp

3. Door hinges

4. Door safety latches

5. See through door

6. Door open button

7. Touch control panel

8. Digital readout

9. Wave guide cover

‘10. Coupling

11. Access cover for oven lamp replacement

12. Menu label

13. Rating label

14. low rack

15. High rack

-0

DISPLAY

Convection

Fan Symbol’

Micro/Defrost _

Symbol

Indicator

TOUCH CONTROL PANEL

MULTI

MULTI COOK PAD

COOK

PN2SStO!X?ktMl&iCC&mode.

REHEATSENSOR PAD

REHEART

SENSOR

Pestosf?ka3pcpdafRehf?at menuswiul~sensrr.

POWER LEVEL PAD

,;]Fzzfp-

Pfesstoseled

-m

I- FUNcrnPADS

settitq. lfnotpressed, HIGH is

NUvlBERANDTEMPERATURE

‘1

2 3 4

5’

4O'C

70-c

130-c 15O'C

160'C

line(33nwam &&M;Cab

7 8

9 0

< 180-c

200-c 22O'C

230-C

STOP/CLEAR PAD

B&g

. MOW4 ES(v) PADS

Prt2sstoincr~ease!hetim klonel?klldeiduitlg a3ckkgortDalIerthedonenessfor tt-K?tsmS0rInsiantPdiorl,~ sersa;Mclticod<urEasy~ rtKxA?.

AUTOSTARTCLOCKPAD

-PK?SStOSfAdodt~AUtOStatt~.

-INSTANTCOOt%T/Wl-PAD PlI?SSOXI?tOCZY&Rx1iflUkat HIGHor’ nxessebyinin~

rflqrkseadltiulis~is pressedM-,Convection,

c3cxMii~.

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OPERATION SEQUENCE

The following is a description of component functions during oven operation.

Relay and Components Connection

SRELAY

CONNECTED COMPONENT

RYl

Oven lamp/ Turntable motor

RY2

Power transformer RY3 Convection heater RY4 Damper motor RY5 Convection motor RY6

Fan motor

OFF CONDITION

Closing the door activates all door interlock switches: upper latch switch, lower latch switch and stop switch. (in this condition, the monitor switch contacts are closed.) When oven is plugged in a wall outlet (240V 50Hz), 240volts A.C. is supplied to the control unit.(Figure O-l):

1. The display flashes “88:88”. To set any programmes or set the clock, you must first touch the STOP/CLEAR pad.

II . II

. appears in the display and the time counts up

every minute.

NOTE:When the oven door is opened, the oven lamp

comes on at this time.

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

tacts, thereby turning off the damper motor.

MICROWAVE COOKING CONDITION

HIGH COOKING

Program desired cooking time and Variable Cooking Control with the touching NUMBER pads and the HIGH pad of the Variable Cooking Control. When the START pad is touched, the following operations occur:

1. The contacts of relays are closed and components con-

nected to relays are turned on (RYI, RY2, RY6). (Figure O-2)

2. 240 volts A.C. is supplied to the primary winding of the power transformer. The voltage is converted to about

3.35 volts AC. output on the filament winding and high

voltage of approximately 2120 volts A.C. on the high voltage winding.

3. The filament winding voltage (3.35 volts) heats the magnetron filament and the high voltage (2120 volts) is sent to the voltage doubling circuit.

4 The 2450 MHz microwave energy produced in the

magnetron generates a wave length of 12.24 cm. This

energy is channeled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.

5. Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off and the generation of microwave energy is stopped. The oven will revert to the OFF condition..

6 When the door is opened during a cook cycle, the

monitor switch, upper latch switch, lower latch switch and stop switch are activared with the following results. The circuits to the turntable motor, cooling fan motor and high voltage components are deenergized, the oven lamp remains on and the digital readout displays the time still remaoning in the cook cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation of the upper latch switch and is mechanically asso-

ciated with the door so that it will function in the following sequence.

1) When the door opens from a closed potion, the upper latch switch and lower latch switch open their contacs, and then the monitor switch contacts close.

2) When the door is closed, from the open position, the monitor switch contacts first open, and then the contacts of the upper latch switch and lower latch switch must be closed.

If the common and normal open contacts of upper latch 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 fuse and upper latch switch,causing the monitor fuse to blow.

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

When variable cooking power is programmed, the 240 volts AC. is supplied to the power transformer intermittently through the contacs of the relay (RY2) which is operated by the control unit within a 32-second time base. Microwave power operation is follows:

VARI MODE

ON TIME OFF TIME HIGH (100% power) MED HIGH (approx. 70% power)

MED (approx. 50% power) MED LOW (approx. 30% power)

32 sec. 24 sec.

18 sec.

12 sec.

0 sec. 8 sec.

4sec.

20 sec.

LOW (approx. 10% power)

6 sec.26 sec.

NOTE:The ON/OFF time ratio does not exactly corre-

spond to the percentage of microwave power, because approx. 2 seconds are needed for heating up

the magnetron filament.

CONVECTION COOKING CONDITION

PREHEATING CONDITION

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

1. The coil of shut-off relays RYI +RY5+RY6 are

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

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R-SHSS

2. The coil of relay (RY4) is energized by the CPU 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 CPU 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 CPU unit and the main supply voltage is added to the con-

vection heater.

4. When the oven temperature reaches the selected preheat temperature, the following operations occur:

4-1. The heater relay (RY3) is de-energized by the CPU

unit temperature circuit and thermistor, opening the circuit to the convection heater.

4-2. The oven will continue to function for 15 minutes,

turning the convection heater on and off, as needed to maintain the selected preheat temperature. The oven will shut-down completely after 15 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. Program desired cooking time and convection temperature by touching the number pad, CONVECTION pad and Temperature pad. When the START pad is touched, the following operations occur:

The numbers of the digital readout start the count down to zero. The oven lamp, turntable motor, cooling fan motor and convection motor are energized. Heater relay (RY3) is energized (if the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the convection heater to return to the selected cooking temperature. 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 112”C, the circuit to (RY6) will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 112”C, 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. This will now cool and allow the damper door to open. 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

Program desired cooking time and temperature by touch-

ing the number pads and the LOW Ml or HIGH MIX pad. When the START pad is touched, the following operations occur:

The numbers of the digital readout start the count down to zero.

2. The shut-off relay (RYl+RYS+RYG) energized, turning on the oven lamp, turntable motor, cooling fan motor and convection 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, adding the mains supply voltage to the convection heater.

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

6. When the oven temperature reaches the selected temperature, the following operations occur:

6-l. The power supply voltages is added to the convection

heater and power transformer alternately.

6-2. The convection heater operates through the heater

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

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

nately 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.

16 SEC: 26 SEC

MICROWAVE POWER

I APPROX 10%

(CONVEC )

CONVECTION TEMPERATLIE

-1BOC

LOW MIX

BAKE

, 1PSEC a 20 SEC

MICROWAVE POWER

.APPROX 30%

(CONVEC )

i ON

CONVECTION TEMPERATUE

-200C

HIGH MIX

Note: During alternate Microwmonvection operation,

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

ABSOLUTE HUMIDITY SENSOR (AH SENSOR) COOKING CONDITION

In case where the AH sensor is used (REHEAT SENSOR or SENSOR INSTANT ACTION), the foods are cooked in microwave cooking mode without figuring time, power level or quantity. When the oven senses enough steam

from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its. resistance 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.

I ]

I /

I I

5 i

/ t

j I

i i

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An example of how sensor works:

1. Potatoes at room temperature. Vapor is emitted very slowly.

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

3. Sensor detects moisture and humidity and calculates cooking time and variable power.

AH SENSOR COOKING SEQUENCE

1. In case the AH sensor cooking condition is started, the coil of shut-off relays (RYl+RY6) are energized, the oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

NOTE:The oven should not be operated on AH SENSOR

COOKING immediately after plugging in the unit. Wait five minutes before cooking on AH SENSOR COOKING CONDITION.

2. After about 16 seconds, the cook relay (RY2) 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.

Figure O-2

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

STOP/CLEAR pad.

3. The oven will go to the Mix Cooking Condition at the 2nd. or 3rd. stage when Reheat pie, Casseroles or Desserts has been chosen. (Figure O-4)

4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time,

the door may be opened to stir food, turn it or season, etc.

NOTE:In case where a small quantity of food is cooked,

the oven will stop without displaying the remaining cooking time.

5. When the timer reaches zero, an audible signal sounds. The shut-off relay (RYl+RY6) and cook relay

(RY2) are de-energized and the power transformer,

oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad,

, the time of day will reappear on the display and the oven will revert to an OFF condition.

MULTI COOK

MULTI COOK will automatically compute the oven temperature, microwave power and cooking time for baking and roasting. Set the desired program by touching the

MULTI COOK 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 Microwave Symbol and/or 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 (RYl , RY3, RY5 and RY6) are ener-

gized, turning on the oven lamp, turntable motor, cool-

ing fan motor and convection motor. The power supply

voltage is added to the convection heater.

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 MULTI COOK 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.

EASY DEFROST COOKING

The EASY DEFROST key is a special function key to de-

frost meats and poultry faster and better.

EASY DEFROST key has 4 defrost stages.

EASY DEFROST automatically defrosts roast beef, etc. When EASY DEFROST is selected and the food weight is entered by using the number pads, the oven will cook according to the special cooking sequence. (Figure O-2)

SENSING FIRE OPERATION

The oven will stop its operation when there is a fire in the oven cavity in microwave cooking condition.

LSI measures the voltage across the temperature meas-

urement circuit intermittently within a 32-second time base after since the oven is started in microwave cooking condition. The oven will-stop its operation when the difference of the voltages is more than 0.3 volts in microwave cooking condition.

1. Within a 32-second base, first the thermistor is energized for 3 seconds. After 2 seconds since the thermistor is energized, the voltage across the temperature measurement circuit is measured. And after 21 seconds since the thermistor is cut off, the convection motor operates for IO seconds.

2. The oven carries out the procedure above again. If the second voltage is 0.3V higher than the first voltage, LSI

judges it is a fire in the oven cavity and stops the oven.

3. When sensor cooking, the sensing fire operation is not carried out until the oven senses the steam from food.

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R-SHSS’

Because food cannot be cooked well by rotating the convection fan at that time. After sensing the steam, the sensing fire operation is started.

4. When LSI judges it is fire in the oven cavity, LSI will switch off the relays to the power transformer, fan mo-

tor and convection motor and LSI stops counting down. And then the damper is closed so that the fresh air does

not come into the oven cavity.

0 2 20

30 32

I I

64 (Set )

I I ! I

k--l,

I I

CONVECTION

I I

MOTOR ON ; ;

I I

I I I

OFF / ;

I I 3sec

-7 I-

I I’

Sensing the voltage across temperature measurement circuit.

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R-9H55

FUNCTION OF IMPORTANT COMPONENTS

UPPER AND LOWER LATCH SWITCHES

Those latch switches are mounted in the latch hooks as

shown in figure. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to all components except CPU unit and relay unit and oven

lamp. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches.

LATCH HOOK UPPER LATCH

SWITCH

STOP SWITCH

LATCH HEADS

MONITOR SWITCH

LOWER LATCH

SWITCH SWITCH LEVER OPEN LEVER

Figure D-l. Switches

MONITOR SWITCH

The monitor switch is mounted on the latch hook. It is activated (the contacts opened) by the lower latch head when the door is closed. The switch is intended to render the oven inoperative by means of blowning the fuse when the contacts of the common and normal open contacts of upper latch switch and lower latch switch fail to open when the door is opened.

Functions:

When the door is opened, the monitor switch contacts

close (to the ON condition) due to their being normally closed. At this time the the common and normal open contacts of upper latch switch and lower latch switch are in the OFF condition (contacts open) due to their being normally open contacts switch.

As the door goes to a closed position, the monitor switch contacts are first opened and then the common and normal open contacts of upper latch switch close. (On opening the door, each of these switches operate inversely.) If the door is opened during cooking, and the common and normal open contacts of upper latch switch and lower latch switch fail to open, the fuse blows simultaneously with closing of the monitor switch contacts.

STOP SWITCH

The stop switch is activated by the latch head. When the door is opened while the oven is in cook cycle,

the stop switch contacts open to de-energize the relay(RY-

1 ,RY-2,RY-3,RY-5,RY-6). Then the cook cycle is stopped.

THERMAL CUT-OUT 150°C (OVEN)

The oven thermal cut-out located on the left side of the

thermal protection plate is designed to prevent damage to the convection heater unit if an overheated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the heater unit, the oven thermal cut-out will open, causing the oven to shut down. When the oven has cooled temperature, the oven thermal cut-out closes.

THERMAL CUT-OUT 90°C (FAN MOTOR)

The thermal cut-out protect the fan motor against overheating. If its temperature goes up higher than 90°C because the fan motor is locked or the ventilation operating are blocked, the contacts of the thermal cut-out will open and switch off the oven. The defective thermal cut-out must be replaced with new one.

TEMPERATURE FUSE 150°C (MG)

This fuse protects the magnetron against overheating. If

the temperature goes up higher than 150°C because the fan motor is interrupted, the air inlet duct is blocked or the ventilation operatings are obstructed, the fuse blows and cuts off the power supplying to the power transformer. The defective fuse must be replaced with new rated one.

FUSE M8A 250V

If the wire harness or electrical components are shortcircuited, this fuse blows to prevent an electric shock or fire hazard. The fuse also blows when upper latch switch and lower

latch switch remain closed with the oven door open and when the monitor switch closes. The fuse M8A-also blows when asymmetric rectifier,

H.V. rectifier, H.V. wire harness, H.V.capacitor, magnetron or secondary winding of power transformer is shorted.

ASYMMETRIC RECTIFIER

The asymmetric rectifier is a solid state device that prevents current flow ins both directions. And it prevents the temperature rise of the power transformer by blowing the fuse M8A when the high voltage rectifier is shorted.

CAUTION: BEFORE REPLACING A BLOWN FUSE

TEST THE UPPER LATCH SWITCH,

LOWER LATCH SWITCHAND MONITOR

SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

HiGH VOLTAGE RECTIFIER

Page 11

The rated peak reverse voltage of Dl of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1.7 KV. Dl and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage. (The process of blowing the fuse M8A.) .

1. The high voltage rectifier is shorted by any causes when microwave cooking.

2. The peak reverse voltage of 02 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the volt-

agedoubler circuit.

3. D2 of the rectifier is shorted.

4. The large electric currents flow through the high volt-

agewinding of the power transformer.

5. The large electric currents beyond 8A flow through the

primary winding of the power transformer.

6. The fuse M8A blows by the large electric currents.

7. The power supply to the power transformer is cut off.

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 heating element relay to operate, thus the current to the heating element is turned ON/OFF.

MONITOR RESISTOR

The monitor resistor prevents the fuse M8A 250V bursting when the fuse M8A 250V blows due to the operation of the monitor switch.

TURNTABLE MOTOR

The turntable motor drives the turntable supporting plate to rotate the turntable.

CONVECTION MOTOR

The convection motor drives the convection fan and provides the heated air.

FAN MOTOR

The fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channeled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted through the exhausing air vents at the oven cavity.

CONVECTION HEATER

The convection heater is located at the rear 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 convection heater.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the convection heater, but is heated by forced circulation of the hot air produced by the convection heater. The air heated by the convection heater is circulated through the convection passage provided on the outer casing of the 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 oven cavity left side wall. Without leaving the oven, this hot air is reheated by the convection heater, 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 convection heater is de-energized. When the temperature inside the oven cavity drops below the selected temperature, the convection heater 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 convection heater is deenergzed and the convection fan stops operating and the oven shutts off. 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 112X, the circuit to RY6 will be maintained (by the

thermistor circuit) to continue operation of the cooling fan

motor until the temperature drops below 112”C, 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. This will now cool and allow the damper door to open.

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 CPU unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooling air is channeled 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-l. 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.

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

the damper cam, damper switch is closed (ON posi-

tion).

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, 1

Page 12

l-4. The signal of damper switch is m-sensed in the con-

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

l-5. The 240 volts A.C. to the damper motor is stopped

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

3-2.

3-3.

3-4.

Damper motor is energized by touching the convec-

tion, temperature and START pads. 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. The damper is held in the closed position during the convection cooking operation 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 durining convection or open durning micro-

wave, the control unit will stop oven operation after

1 minute.

Cooking Mode

Operation of Damper Microwave cooking OPEN Convection cooking

CLOSE Sensor cooking OPEN Automatic mix cooking CLOSE

Grill cooking

CLOSE Slow cooking CLOSE

DAMPER SHAF

MPER DUCT

DAMPER CAM

MPER SWITCH

DAMPER MOTOR

Figure D-2. Damper Mechanism

Page 13

TROUBLESHOOTING CHART

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution.

REMEMBER TO CHECK 3D

REMEMBER TO CHECKa

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

WARNING AGAINST THE CHARGE OF THE

HIGH-VOLTAGE CAPACITOR

The high-voltage capacitor remains charged

about 60 seconds after the oven has been

switched off. Wait for 60 seconds and then shortcircuit the connection of the high-voltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. 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 microwave timer for two (2) minutes. Set the power level to HIGH and push the START button. When

the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D checks and re-examine the connections to the component being tested.

Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to connect the

supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer.

Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.

When all service work is completed, and the oven is fully assembled, the microwave power output should be checked and microwave reakage test carried out

TROUBLESHOOTING GUIDE

When troubleshooting the microwave oven,it is helpful

IMPORTANT:lf the oven becomes inoperative because of a

to follow the Sequence of Operation in performing the

blown fuse M8A in the upper latch switch -

checks. Many of the possible causes of trouble will re-

lower latch switch - monitor switch - monitor

quire that aspecific test be performed. These tests are

resisitor circuit check the upper latch switch,

given a procedure letter which will be found in the “Test

lower latch switch, monitor switch and moni-

Procedure”section.

tor resistor before replacing the fuse M8A..

Page 14

TEST PROCEDURE

ABCDEEEFGGHIJJ J JKL

POSSIBLE CASE

DEFECTIVE PARTS

:ONDITION

PROBLEM

Home fuse blows when power cord is plugged into

wall outlet. Fuse M8A blows when power cord is plugged into

wall outlet.

IFF

88:88 does not appear in display when power cord is

:ONDlTION .

first plugged into wall outlet. Display does not operate properly when STOP/

CLEAR pad is touched. (The time of day should appear on the display with beep sound during normal condition.)

---

Oven tamp does not light with door opened. Oven lamp does not light at all

000

I -- --

:OOKING

Oven lamp light, but turntable motor does not

‘ONDITION

operate. Cooling fan motor does not operate.

The oven stops after1 minute

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

Low or no power is produced during microwave

IfCROWAVE)

;o,;Q;ga/I$e food is heated incompletely or not 0 0 () 0

Extremely uneven heating is produced in oven load

(food). Function of variable cooking does not operate prop-

erly except HIGH power. CONV indicator lights, but heating-element does not

heat. Temperature in the oven cavity is lower or higher

than preset. Convection cycle runs 1 minute then the oven shuts

3NVECTfON) down.

Convection cycle runs 3 minutes then the oven shuts down.

Oven is in the sensor cooking condition but AH sen-

,H SENSOR) sor does not end 1 St. stage or does not stop cooking

cycle or the oven stops soon.

00 0

0 0

Page 15

RE = REPLACE / CK = CHECK

z 4

T 2

Y >

4 w lx

I-

W x c>

co LL:

a, 2

-I z

? 0

2 3

m C)I

a z

E 3 121

P cc

0 I: cl3

a: 0

Iii

3 3

C C

c C

Q 0

3 3

-T-

SK CH

Page 16

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

A MAGNETRON TEST

NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.

CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament

terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron

filament terminals, the meter should show a reading of less than 1 ohm. To test for a short circuit filament to anode condition, connect ohmmeter between one of the filament

terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER (1 Liter water load)

The following test procedure should be carried out with the microwaveoven in a fully assembled condition (outer case fitted).Microwave output power from the magnetron can be measured by way oflEC 705, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used.When P(W) heating works for t(second), approximately P x tI4.187calorie is generated. On the other hand, if the temperature of the water with V(ml) rises AT (“C) during this microwave heating period, the calorie of thewater is V x AT

The formula is as follows; f’xt/4.187=VxAT

P(W)=4.187xVxAT/t

Our condition for the water load is as follows:

Room temperature . . . . . . . . . . . . . . . . . . . . . . . . . . around 20°C Power supply Voltage . . . . . . . . . . . . . . . Rated voltage

Water load . . . . . 1000 g

Initial temperature

. . . . . . . . . . . 1 O-t-2°C

Heating time

. . . . . . . . . . . . . . . . . . . . . 49 sec.

P=85xAT

Measuring condition:

1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start of the test.

3. Temperature of the water The initial temperature of the water is (10 + 2)“C.

4. Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5°C.

5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat.

6. The graduation of the thermometer must be scaled by 0.1 “C at minimum and an accurate thermometer.

7. The water load must be (1000 sf: 5) g.

8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heat-

up time is not included.

NOTE: The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament heat-up

time.

Measuring method:

1. Measure the initial temperature of the water before the water is added to the vessel.

(Example: The initial temperature Tl = 11 “C)

2. Add the 1 litre water to the vessel. 3 Place the load on the centre of the shelf.

Page 17

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of (10 *2)X.

5. Stir the water to equalize temperature throughout the vessel.

6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C)

7. Calculate the microwave power output P in watts from above formula.

Initial temperature

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tl = 11°C

Temperature after (49+2)= 51 sec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T2 = 21 “C

Temperature difference Cold-Warm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AT1 = 10°C

Measured output power

The equation is “P= 85 x AT” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 85 x 10°C = 850 Watts

JUDGMENT: The measured output power should be at least + 15 % of the rated output

power.

CAUTION: 1 C CORRESPONDS TO 85 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

1 ooog

- -

TlOC

-- -

Hea

1 ooog

-I-

‘f

-3,; . c

T2%

MICROWAVE OUTPUT POWER (2 Liter water load)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (with outer case fitted).

Microwave output power from the magnetron can be measured by way of substitution, i.e. it can be measured by using a water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. On the other hand, if the temperature of the water with V(ml) rises AT (“C) during this microwave heating period, the calorie of the water is V x AT.

The formulae is as follows;

P =8330xVxAT/t

Our condition for the water load is as follows:

Room temperature

. . . . . . . . . . . . . . . . . 23+ 2°C

Power supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 240 volts.

Water load

. . . . . . . 2000 ml Initial temperature

. . . . . . . 23 + 1 “C

Heating time . . . . 1 min. 51 sec.

P = 75 x AT

Measuring method:

A) The two water containers must be prepared.

The water container must be one (1 j litre beaker made of Pyrex glass and its diameter approximately 12cm.

B) Put the one (1) litre water into each beaker (Each beaker has one litre water). The initial tempera-

ture of the water should be 23+2”C.

C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the

temperature of water the thermometer and note them. The graduation of the thermometer must be

scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended. D) Place the two (2) beakers as touching each other in the-centre of the oven cavity. E) Set the timer to 1 minute and 51 seconds start the oven at HIGH.

Page 18

A-9H55

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring

the water with thermometer and note them.

Example

Initial temperature . . . . . . . . . . . . . . . . . . . . . . . . . . ..*...................*.................................. Tl = 23°C T2 = 24°C

Temperature after 1 min. 51 set

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tl = 33°C T2 = 34°C

Temperature difference Cold-Warm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..ATl =

10°C AT2 =

10°C

Mean temperature rise AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Measured output power

AT = (AT1 + AT2) / 2 = (1 O’C+lO”C) / 2 = 10°C

The equation is P= 75 x AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 75 x 10°C =

750 Watts

NOTE: The measured output power should be at least + 15 % of the rated output power.

CAUTION: 1 “C CORRESPONDS TO 75 WATTS.

REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

(Tl ‘C) (T2OC)

(Tl OC) (T2OC)

Heat up for min. 5 set

POWER TRANSFORMER TEST

WARNING: High voltages and large currents are present at the secondary winding and fila-

ment winding of the power transformer. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements at the highvoltage circuits, including the magnetron filament.

CARRY OUT 3D CHECKS.

Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be

obtained :

-4

a. Primary winding

..................................

less than 1 .3 ohms.

b. Secondary winding

....................... approximately 72

ohms.

Filament winding..

....................................

less than

ohm.

If the reading obtained are not as stated above, then the power transformer is probably faulty and

should be replaced.

CARRY OUT 4R CHECKS

HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

HIGH VOLTAGE RECTIFIER TEST

CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested

using an ohmmeter set to its highest range.

Page 19

R-9H55

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and mor than 100 kR in the other direction.

A D2 Dl B

CARRY OUT 4R CHECKS

ASYMMETRIC

ASYMMETRIC RECTIFIER TEST

-T@

RECTIFIER

CARRY OUT 3D CHECKS.

C HIGH VOLTAGE RECTIFIER

Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested using an ohmmeter-set to its highest range. Connect the ohmmeter across the terminals A+B of the asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both directions then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either direction, then the the asymmetric rectifier is probably faultly

and must be replaced with the high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is shorted.

CARRY OUT fi CHECKS

NOTE: For measurement of the resistance of the rectifier, the batteries of the measuring instrument

must have a volyage at least 6 volts, because otherwise an infinite resistance might be shown in both directions.

D HIGH VOLTAGE CAPACITOR TEST

CARRY OUT 3D CHECKS.

A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resis-

tance range.

C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10 MQ

after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance of about 10 MQ because of its internal 10 MR

resistance. F. When the internal wire is opened in the high voltage capacitor, the capacitor shows an infinite

resistance.

G. The resistance across all the terminals and the chassis must be inifinte when the capacitor is nor-

mal.

If incorrect readings are obtained, the high voltage capacitor must be replaced.

CARRY OUT 4R CHECKS

SWITCH TEST

CARRY OUT 3D CHECKS.

Isolate the switch to be tested and using an ohmmeter check

following table.

Table: Terminal Connection of Switch

Plunger Operation

1 COMtoNO 1 COM to NC

Released I O.C. I

S.C.

Deoressed I S.C. I

O.C. I

between the terminals as described in the

COM; Common terminal NO; Normally open terminal NC; Normally closed terminal S.C.; Short circuit O.C.; Open circuit

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT fi CHECKS.

Page 20

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

F BLOWN FUSE F M8A

CARRY OUT 3D CHECKS

1. If the fuse M8A is blown, there could be shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

If the fuse M8A is blown when the door is opened, check the upper latch switch, lower latch switch,

monitor switch and monitor resistor. If the fuse M8A is blown by incorrect door switching, replace the defective switch(s) and the fuse

M8A.

If the fuse M8A is blown, there could be short in the asymmetric rectifier or there is a ground in wire harness. A short in the asymmetric rectifier may have occured due to short or ground in H.V. recti-

fier, magnetron, power transformer or H.V. wire. Check them and replace the defective parts or repair the wire harness.

CARRY OUT 4R CHECKS

CAUTION: Only replace fuse with the correct value replacement.

G TEMPERATURE FUSE AND THERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an ohmme-

ter, make a continuity test across the two terminals as described in the table below.

CARRY OUT $FJ CHECKS

Table: Temperature Fuse and Thermal cut-out Test

Parts Name

Temp. fuse 15O’C Thermal cut-out 150X Thermal cut-out 9O’C

Temperature of “ON” condition Temperature of “OFF” condition

Indication ofohmmeter

(closed circuit) (‘C)

(open circuit) (‘C)

(When room temperature

is approx. 20-C)

Below -20-C

Above 150 ‘C Closed circuit

Below 130%

Above 15O’C

Closed circuit.

Below -20-C

Above 90X

Closed circuit.

If incorrect readings are obtained, replace the temp. fuse or thermal cut-out.;

An open circuit temperature fuse 150°C (MG) indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out 150°C (OVEN) indicates that--the convection motor has over heated, this may be due to convection motor locked.

An open circuit thermal cut-out 90°C (FM) indicates that the fan motor winding has overheated, this

may be due to blocked ventilation or locked cooling fan.

CONVECTION HEATER TEST

CARRY OUT 3D CHECKS

Before carring out the following tests make sure the heater is fully cool.

1. Resistance of heater Disconnect the wire leads to the heater to be tested. Using ohmmeter with low resistance range. Check the resistance across the terminals of the heater. The resistance of heater is approximately 37.5 ohms.

Page 21

R-9HS!f

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

2. Insulation resistance Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the

element and cavity using a 500V - 1 OOMohms insulation tester. The insulation resistance should be

more than IOMohms in the cold start.

If the results of above test 1 and/or 2 are out of above specifications, the heater is probably faulty and

should be replaced. CARRY OUT fi CHECKS

THERMISTOR TEST

CARRY OUT 3D CHECKS

Disconnect connector-E from the CPU unit. Measure the resistance of the thermistor with an ohmme-

ter. Connect the ohmmeter leads to Pin No’s E-3 and E-4 of the thermistor harness.

Room Temp. Resistance

68”F(2O”C) - 86”F(3O”C)

Approx. 350kR - 155kR

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

CARRY OUT #J CHECKS

H MOTOR WINDING TEST

CARRY OUT aCHECKS

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.

Table: Resistance of Motor

Motors

Resistance

Fan motor

Approximately 173 Q

Turntable motor

Approximately 10.5 kR Convectron fan motor Approxrmately 190 Q Damper motor

Approximately 11.3 kR

If incorrect readings are obtained, replace the motor.

CARRY OUT fi CHECKS

MONITOR RESISTOR TEST

CARRY OUT =CHECKS.

Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check

between the terminals of the monitor resistor.

The resistance of monitor resistor is approx. 0.8 ohms.

If incorrect readings are obtained, replace the monitor resistor.

CARRY OUT 4R CHECKS.

Page 22

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

L 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.ln 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. 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) The figure of all digits 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.

M KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed. first verify the ribbon is making good contact and verify that the door sensing switch operates properly(contacts are closed when the

door is closed and open when the door is open). If the stop switch is good, disconnect the flat ribbon that connects the key unit to the control unit and make sure the stop switch is closed(either close the door or short the stop 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 abeep the key unit is faulty and must

be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used ( after clearing the control unit) to determine if the control

unit or key pad is at fault.

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Frash

HIGH MIX A

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Page 23

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

N RELAY TEST

Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 3-pin connector (A) on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit. 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 or convection

cooking operatio

DC. voltage indicated . . . . . . . . . . . . . .Defective

relay.

DC. voltage not indicated . . ..Check diode which is connected to the relay coil. If diode is goodcontrol

unit is defective.

RELAY SYMBOL

OPERATIONAL

VOLTAGE

CONNECTED COMPONENTS

IRYl 1 Approx. 18V.D.C.

1 Ovenlamp and Turntable motor

RY2(COOK)

Approx. 18V.D.C. Power transformer

-1

RYS(HEATER) Approx. 18V.D.C. Heating element

RY4 1 Approx. 18V.D.C.

1 Damper motor

RY5

1 Approx. 18V.D.C. Convection motor

RY6 1 Approx. 18V.D.C. Cooling fan motor

--1

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 OCCURANCE

CAUSE OR CORRECTION

The rated voltage is not applied to POWER Check supply voltage and oven power cord. terminal of CPU connector (CN-A)

The rated voltage is applied to primary side of Power transformer or secondary circuit defective. Check power transformer.

and repair.

Only pattern at “a” is broken.

‘Insert jumper wire 1 and solder.

Pattern at “a” and “b” are broken.

‘Insert the coil RCILF2003YAZZ between “c” and “d”.

NOTE: At the time of these repairs, make a visual in-

spection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any abnormal condi-

tion is detected, replace the defective parts.

Page 24

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

AH SENSOR TEST

Checking the initial sensor cooking condition (1) The oven should be plugged in at least five minutes before sensor cooking. (2) Room temperature should not exceed 95”F(35”C). (3) The unit should not be installed in any area where heat and steam are generated. The unit should

not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION In-

structions” in the operation manual.

(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To

permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any

moisture with 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 vapor given of by the spray and turn off before food is properly cooked.

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 INTELLIGENT SENSOR pad and number pads 1 and 0. Now, the oven is in the intelligent

sensor cooking condition and IS-l 0 will appear in the display.

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

ergY-

NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of

sensor cooking.

(6) After approximately 16 seconds, microwave energy is produced, oven should turn off when water

is boiling (bubling).

If the oven does not turn off, replace the AH sensor or check the control unit, refer to TESTING

METHOD FOR AH SENSOR AND/OR CONTROL UNIT.

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-l. 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 INTELLIGENT SENSOR pad and number 1 and 10 pads. 6-5. Touch Start pad. The control panel is in intelligent sensor operation. 6-6. The oven will turn off automatically when the water is boiling (bubling).

lf 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.

Page 25

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

(4) Disconnect the sensor connector. (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-l. Touch INTELLIGENT SENSOR pad and number 1 and 0 pads. 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.This condition is same as

judgement by AH sensor.

6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will sound, and

the display will then revert to the time of day. If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.

RI, R2: 22 R+ 1% 1/2W

R3: 1 Ok Q + 5% 1/4W

F-l F-2

F-3

To connector (F)

on Control Unit.

R4: IM R&5% 1/4W

COM

n- 1

---

CONNECTOR

Figure A. Sensor Dummy Resistor Circuit

R-9H55]

Page 26

TOUCH CONTROL PANEL ASSEMBLY

OUTRINE OF TOUCH CONTROL PANEL

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

Buzzer Circuit

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

(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 generated in the LSI are sent to the key unit through POO,PO5,PlO,

PI 3,P14,P22,P23 and P25. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through RO-R3 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 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 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 signals resetting the LSI to the

initial state when power is applied.

1 Absolute Humidity Sensor Circuit

This circuit detects the humidity of the food which is

being cooked, to control its automatic cooking.

Stop Switch

A switch to “tell” the LSI if the door is open or closed.

Relay Circuit

To drive the magnetron, heating element, fan motor, convection motor, damper 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 6-digits, 15-segments are used for displaying figures.

Temperature Measurement Circuit(l): Oven

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.

Page 27

DESCRIPTION OF LSI

LSI( IZA501 DR)

The I/O signals of the LSI(IZA501 DR) are detailed in the following table.

Pin No.

Signal l/O Description

1 VREF IN

Reference voltaae innut terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(OV) 2 IN7 IN Terminal to chanae cookina constant. 3-4 IN6-IN5 IN Signal similar to IN7. 5 IN4 IN

Innut sianal which communicates the damner onen/close information to LSI.

Damper opened; “H” level signal(OV:GND). Damper closed; “L” level signal(-5V:VC).

IN3

IN In&t sianal which communicates the door oDen/close information to LSI.

Door closed; “H” level signal(

Door opened; “L” level signal(-5V).

7 IN2 IN Temnerrature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermis-

tor, this input is converted into temperature by the A/D converter built into the LSI.

IN1 IN

AH sensor innut.

This input is an analog input terminal from the AH sensor circuit, and connected to

the A/D converter built into the LSI.

IN0

Used for intial 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

coverter built into the LSI.

IO-14 P47-P43

OUT Used for intial balancing of the bridge circuit (absolute humidity sensor).

P42

OUT Timina sianal outnut terminal for temnerature measurement(OVEN).

“H” level (GND) : Temperature measuring timing. (convection cooking) “L” level (-5V) : Thermistor OPEN timing.

P41

OUT Terminal not used.

P40 OUT Maanetron hiah-voltaae circuit drivina sianal.

-ON

To turn on and off the cook relay(RY2). In

HIGH

high operation, the signals holds “L” level during microwave cooking and “H” level

while not cooking. In other cooking

modes (MED HIGH, MED,MED

LOW,LOW) the signal turns to “H” level and “L” level in repetition according to the power level.

P37

P36

OUT Terminal not used.

OUT

Coolina fan motor drivina sianal.

To turn on and off the shut-off relay(RY6). “L” level during both microwave and convection cooking; “H” level dtherwise.

P35

OUT

Heatina element drivina sianal.

To turn on and off the heater relay(RY3). “L” level during convection cooking; “H” level otherwise. During convection cooking. the signal becomes “H” level when the temperrature of the oven cavity exceeds the predetermined temperature.

Page 28

Pin No.

Signal

I/O

Description

P34

OUT Convection motor drivina sianal.

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

P33

OUT

Oven lamn and Turntable motor drivina sianal. (Square Waveform : 50Hz)

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

20 msec

The square waveform voltage is delivered

to the RYl driving circuit and relays

(RY2,RY3,RY5) control circuit.

Drvnp CmkmJ

P32

OUT

Sianal 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 (15 minutes) is elapsed.

H GND

P31

Sianal to svnchronize LSI with commercial bower source freaencv.

This is basic timing for all real time processing of LSI.

P30 OUT Damber motor relav drivina sianal.

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

CNVSS

Connected to VC.

RESET

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to “L” level the moment power is supplied, at this time the LSI is reset. Thereafter set at “H” level.

Internal clock oscillation freauencv settina input.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with resoect to XOUT terminal.

XIN IN

29 XOUT

OUT Internal clock OSCiltatiOn freouencv control outuut.

Output to control oscillation input of XIN. Terminal not used.

30/3 1 IN/OUl KCIN/XCOUT

vss

Power source voltaae: -5V

VC voltage of power source circuit input.

OUT Terminal not used.

Sianal comina from touch kev.

When any one of G-l line keys on key matrix is touched, a corresponding signal from POO,PO5,P1O,P13,P14,P22,P23 or P25 will be input into R3. When no key is 1 touched, the signal is held at “L” level.

Sianal similar to R3:’

When any one of G-2 line keys on key matiix is touched, a corresponding signal will be input into R2. _

Sianal.similar to R3.

When any one of G-3 line keys on key m&ix is tbbched, a corresponding signal will be input into RI.

Sianal similar to R3.

When any one of G;4 line keys on key matiix is touched, a corresponding signal will be input into RO.

34 R3 IN

R2 IN

37 RO ’

Page 29

Description

sin No.

Signal I/O

IN Anode (seament) of Fluorescent Disolav liaht-uD voltage: -3lV

Vp voltage of power source circuit input.

PI7

OUT Terminal not used

PI6

OUT Seament data sianals.

The relation between signals and indicators are as follows: Signal Segment Signal

Segment

PA 6 _______________ LB2 PO2 _________-_--_- g P14 _______________ UB2 PO1 _____________-- f pt 3 ---------------

LB1 PO0 -- _____________ e

(50Hz)

p1 1 _______________ UBj p26 ____________--_ d

pl() _______________ k

p25 _______________ c

PO7 e ______________ j

p23 _- _____________ b

PO5 _______________ i

p22 _______________ a

PO4 _______________ h

P15

OUT

Diait selection sianal.

The relationship between signal and digit are as follows:

___--.

Digit signal

digit

R (50l-k)

pj5 --------------- 1st

p12 _______________ 2nd

-.____-_-__----_ (-gqD

PO6 _______________ 3rd PO3 _______________ 4th p27 _______________ 5th

PO6 n

p24 --------------- 6th

PO3 n

Normally, one pulse is output in every 0 period, and input to the grid of the Fluo-

P27 4

rescent Display.

P24 d

OUT

P14

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-5 line keys on key matrix is touched.

PI3

OUT

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-6 line keys on key matrix is touched.

PI2 OUT

Diqit selection sianal.

Signal similar to P15.

OUT

Pll

Seament data sianal.

Signal similar to P16.

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-7 line keys on key matrix is touched.

Seament data sianal.

Sianal similar to P16.

PI0

OUT

PO7 OUT 47

48 PO6 OUT

Diait selection sianal.

Signal similar to PK.

Page 30

Signal

I/O

Pin No.

Seament data sianal.

Description

-4

PO5

OUT

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-8 line keys on key matrix is touched.

PO4 OUT

Seqment data sianal.

Signal similar to P16.

PO3 OUT Diqit selection sianal.

Signal similar to P15.

Seament data sianal.

Signal similar to P16.

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while

one of G-9 line keys on key matrix is touched.

Diait selection sianal.

Signal similar to P15.

Seament data sianal.

Signal similar to P16

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-10 line keys on key matrix is touched.

Diait selection sianal.

Signal similar to P15.

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-l 1 line keys on key matrix is touched.

Seament data sianal.

Signal similar to P16.

Kev strobe sianal.

Signal applied to touch-key sectjon. A pulse signal is input to RO-R3 terminal while one of G-12 line keys on key matrix is touched.

Terminal not used. Connected to GND.

52-53

PO2-PO’ OUT

OUT

PO0

P27

P26 OUT

57 P25 OUT

58 P24

OUT

P23 OUT 59

P22

OUT

61-62

P21 -P2C

OUT

63/64

4vcc/vcc IN

Page 31

ABSOLUTE HUMIDITY SENSOR CIRCUIT

(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 par-t (Open vessel)

Sensing part (Closed vessel)

(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 (RI 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 150°C (302”F), 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 ampli-

fier.

Absolute humidity (g/m 2)

(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 than the detector circuit starts to function and the LSI observes the initial voltage available at its IN1

terminal.

With this voltage given, the switches SW1 to SW5 in the

LSI are turned on in such a way as to change the resis-

When the LSI starts to detect the initial voltage at IN1

tance values in parallel with R50-1. Changing the re-

terminal16 seconds after the unit has been put in the

sistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor

Sensor Cooking mode, if it is not possible to balance, of

and IN0 terminal of the LSI. The voltage of IN1 terminal

will indicate about -2.5V. This initial balancing is set up

the bridge circuit due to disconnection of the absolute

about 16 seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the

humidity sensor, ERROR will appear on the display and

food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to in-

the cooking is stopped.

crease the voltage available at IN1 terminal of the LSI. Then the LSI observes that voltage at IN1 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.

1 )Absolute humidity sensor circuit

IC2(IZA495DR)

1 I

C. Thermistor In

closed vesssl

S. Thermistor In

----_-_-_

SW1

P47 --o(

-1

P46 5

-1

P45 =s-

P44 -2% P43 =

‘rl

3 9

7 IN0

LSI

2 8

* IN1

VA -15V

VC : -5v

Page 32

SERVICING

1. Precautions for Handling Electronic Components

This unit uses PMOS LSI in the integral part of the circuits. When handling these, parts, the following precautions should be strictly followed.

PMOS 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 PMOS LSI.

1) When storing and transporting, thoroughly wrap

them in aluminum 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.

/n\

approx. 1 M ohm

JPl-5

2. Shapes’ of Electronic Components

ECB

Transistor 2SB793

Transistor

DTDi 43EA

Transistor

DTA143ES DTBl43ES KRA102M KRC102M

2SA933S

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 pri-

mary 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.

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 stop 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 sensor-related controls of the touch control panel by using the dummy resistor(s).

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: DC1 OMHz type or more advanced model.

3) Others: Hand tools

5. Other Precautions

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 stop 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.

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 ab-

normal voltage due to static electricity etc. is not applied to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to

PWB, making sure that all connections are tight.

5) Be sure to use specified components where high

precision is required.

30 ._

Page 33

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC-

TIONS BELOW .BRBEFORE OPERATING THE OVEN.

1. CARRY OUT 3D CHECKS.

Make sure that a definite “click“ can be heard when the door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch heads to rise, it is then possible to hear a “click” as the door switches operate.)

3. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).

2. Door hinge, support or latch hook is damaged.

3. The door gasket or seal is damaged.

4. The door is bent or warped.

5. There are defective parts in the door interlock system.

6. There are defective parts in the microwave generating and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:

1. Without the RF gasket (Magnetron).

2. If the wave guide or oven cavity are not intact.

3. If the door is not closed.

4. If the outer case (cabinet) is not fitted.

Carry out any remedial work that is necessary before operating the oven.

Do not operate the oven if any of the following conditions

exist

1. Door does not close firmly. Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal proce-

dures:

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

3. Remove the screws from rear-and along the side edge

of case.

1. Disconnect oven from power supply.

2. Open the oven door and wedge it open.

N.B.; Stepl, 2 and 6 from the basis of the 3D checks.

Discharge the H.V. capacitor before carring out any fur-

ther work.

7. Do not operate the oven with the outer case removed.

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

CAUTION: DISCHARGE HIGH VOLTAGE CAPACI-

from retaining clips on the cavity face plate.

TOR BEFORE TOUCHING ANY OVEN

5. Lift the entire case from the oven.

COMPONENTS OR WIRING.

POWER TRANSFORMER REREPLACEMENT

REMOVAL

corners underneath those tabs.

1. CARRY OUT 3D CHECKS

2. Disconnect the wire leads from power transformer

Disconnect the filament leads of the power transformer

from the megnetron and high voltage capacitor.

Disconnect the high voltage leads of capacitor from the

transformer.

Remove the two (2) screws and one (1) washer holding

the transformer to the base cabinet.

6. Remove the transformer.

RE-INSTALL

1. Rest the transformer on the base cabinet with its pri-

mary terminals toward rear cabinet.

2. Insert the two edges of the transformer into two metal

tabs of the base cabinet.

3. Make sure the transformer is mounted correctly to the

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

5. Re-connect the wire leads (primary and high voltage) i and high voltage lead to the transformer and filament

j 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.

NOTF. t IVF(ORANCfi) WIRF MlJSTLBfXQNNFCTED-

TO THE CABINET-SIDE OF THE POWER TRANSFORMER.

Page 34

MAGNETRON REMOVAL

i j

t i

I t I

I I

i I

1. CARRY OUT 30 CHECKS

2. Disconnect filament lead of transfomer and high voltage wire lead from magnetron.

3. Take off three (3) screws secured the chassis support

to oven cavity and waveguide.

Remove the cooling fan assembly refer to “Cooling Fan Removal”

When removing the screws hold the magnetron and magnetron air guide to prevent it from falling.

6. Remove the magnetron from the waveguide with care so the magnetron antenna should not hit by any metal object around the antenna

5. Carefully remove four (4) mounting screws holding the magnetron and magnetron air guide to waveguide.

CAUTION: WHEN REPLACING THE MAGNETRON, BE

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

ASYMMETRIC RECTIFIER AND HIGH VOLTAGE RECTIFIER REMOVAL

1, CARRY OUT 30 CHECKS

2. Remove one (1) screw holding the high voltage rectifier terminal to the capacitor holder.

TIFIER ASSEMBLY, ENSURE THAT TH

3. Disconnect the high voltage rectifier assembly from the capacitor.

SECURED FIRMLY WITH AN EARTHIN

HIGH VOLTAGE CAPACITOR REMOVAL

1. CARRY OUT 3D CHECKS

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

3. Disconnect filament lead of transfomer from high voltage capacitor.

transformer.

5. Remove one (1) screw and washer holding the high voltage rectifier from the capacitor holder.

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

4. Disconnect high voltage wire leads of capacitor from

7. Remove the high voltage capacitor from the holder.

OVEN LAMP SOC

1. CARRY OUT 3D CHECKS

2. Pull the wire leads from the oven lamp socketby pushing the terminal hole of the oven lamp socket withthe

flat type small screw driver.

3. Lift up the tab of oven lamp mounting plate holding the

oven lamp socket.

4. Slide the oven lamp socket left-ward.

5. Now, the oven lamp socket is free. CAUTION: WHEN REPLACING THE OVEN LAMP

SOCKET, REPLACE IT SO THAT THE SIDE WHERE THE BLACK DOT IS PUT

‘KET

REMOVAL

screw driver

Terminal hole

Oven lamp socket

HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/THERMISTOR)

1. CARRY OUT 3D CHECKS

2. Disconnect wireleads from oven thermal cut-out, convection motor, thermistor and heater element. Remove convection motor ass’y refer to “Convection Motor Removal No.3 to No.5”.

3. Remove eleven (11) screws holding heater duct to the oven cavity.

Release two (2) snap bands holding wire harness to the thermal protection plate (left).

5. The heater unit is now free.

HEATING ELEMENT AND THERMISTOR

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.

4. Remove two (2) screws holding thermistor to heater duct.

5. Thermistor is free.

Page 35

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

To remove the control panel, proceed as follows:

1. CARRY OUT 3D CHECKS

2. Disconnect connector CN-A, CN-E, CN-B, CN-F, TABI, TAB2 and TAB3 from the control unit.

3 Remove one (1) screw holding the control panel back

plate to the chassis support.

4. Remove the one (1) screwt holding the bottom edge of

the back plate to the cabinet base.

5. Remove wo (2) screws holding the back plate to the

oven cavity flange.

6. Lift up and pull the control panel 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.

6. Now, the control unit and frame assembly are separated.

TURNTABLE MOTOR AND/OR COUPLING REMOVAL

1. Disconnect the oven from power supply.

2. Remove one (1) screw holding the turntable motor cover to the base cabinet and take off the turntable

3. Disconnect wire lead from the turntable motor.

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

5. Pull the turntable coupling out of the oven cavity.

motor cover.

6. Turntable coupling and motor will be free.

CONVECTION MOTOR REMOVAL

1. CARRY OUT aCHECKS

2. Disconnect wire leads from the convection motor. Remove the convection fan belt and pulley(M).

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

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

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

6. Convection motor is now free.

DAMPER ASSEMBLY REMOVAL

1. CARRY OUT aCHECKS

4. Remove two(2) ovenside screws holding damper motor

2. Remove cooling fan motor and magnetron refer to

angle to thermal protection plate (right).

5. Damper assemblv is free.

“Cooling Fan Motor Removal” and “Magnetrom Re-

6. Remove one (I\ screw holding damper motor to

moval”.

damper motor angle and one (1) screw holding damper

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

_ twitch to damper motor angle.,

/. uamper motor ana swrtcn are Tree.

FAN MOTOR REPLACEMENT

3 i

REMOVAL

1. CARRY OUT =CHECKS

2. Disconnect the wire leads from the fan motor and thermal cut-out.

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

waveguide.

4 Remove one (1) tab holding the fan duct to air guide .

5. Remove the fan motor assembly from the oven cavity.

6. Remove the fan blade assembly 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 be-

tween the rotor and the stator of the fan motor. Because the rotor is easy to be 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 transform the bracket by touching with the

pliers.

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

3) Now, the fan blade will be free.

Page 36

CAUTION: * Do not use this removed fan blade again.Because

the hole(for shaft) of it may become bigger than a

standard one.

7. Remove the two (2) screws and nuts holding the fan motor and thermal cut-out mounting angle from the fun

duct.

8. Now, the fan motor is free.

INSTALLATION

1. install the fan motor and thermal cut-out angle to the

fan duct with the two (2) screws and nuts.

2. Install the fan blade assembly 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 assemby 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 be-

cause the bracket may be transformed.

* Make sure that the fan blade rotates smooth after

installed.

l Make sure that the axis of the shaft is not slanted.

3. Install the fan duct to the air guide.

4. Install the chassis support to the oven cavity with three (3) screws.

5. Connect the wire leads to the fan motor and the thermal cut-out, referring to the pictorial diagram.

hese are the position here should be

nched with pliers

Rear view

Side view

STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH REMOVAL

1. CARRY OUT aCHECKS.

2. Remove control panel assembly, refer to “Control Panel Removal”.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from each of the switches.

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

flange.

6. Remove latch hook assembly from oven flange.

7. Push downward on the one (1) stopper tabs holding each of the switches place.

8. Switches are free.

At this time latch lever will be free, do not lose it.

Re-install

1. Re-install latch lever and each switch in its place, refer to Figure C-l.

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

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

the oven flange.

4. Make sure that monitor switch is operating properly. Refer to chapter “Test Procedure” and Adjustment pro-

cedure.

Page 37

ing it back and forth. In and out play of the door allowed by the latch hook should be less than 0.5 mm.

3. Secure the screws with washers firmly.

4. Now, make sure of the upper and lower latch switches operations. If these latch switches are not activated with the door closed, loose the screws holding the latch hook to the oven cavity front flange and adjust the latch hook position.

After the adjustment, make sure of the following:

1. The in and out play of the door remains less than 0.5 mm at latched position.

2. The upper and lower latch switches interrupt the circuit before the door can be opened.

3. The monitor switch contacts close when the door is

opened.

4. Re-install the outer case and check for microwave leakage around the door with an approved microwave sur-

vey meter. (Refer to Microwave Measurement Proce-

dure.)

Figure C-l. Latch Switches Adjustment

STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH ADJUSTMENT

If those switches do not operate properly due to a misad-

justment, the following adjustment should be made.

. .

1. Loosen the two (2) screws holding the latch hook to the

flange on the oven front face.

‘I

2. With the door closed, adjust the latch hook by moving it

LATCH HOOK

back and forth and then adjust the latch hook by mov-

STOP SWITCH

MONITOR SWITCH

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-3 to free engaging parts.

3. Lift up choke cover.

4. Now choke cover is free from door panel.

@ LIFTUP

PUTTY KNIFE

:;I;, Bent /lNsloEl Choke

cover

Upper

Lower

[FRONT]

Figure C-2. Door Disassembly

Page 38

DOOR REPLACEMENT AND ADJUSTMENT

I I

i’

I i

E I

;

, I

t !

! I

DOOR REPLACEMENT

1. Disconnect oven from power supply and remove outer case. Remove turntable tray and roller stay from oven cavity.

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

3. Remove 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 individual parts are replaced, refer to “Door

Disassembly”.

6. On re-installing door, insert the upper oven hinge into

the door hinge pin. Then while holding door in place.

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

the latch holes correctly.

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

Note: After any service to the door;

(A) Make sure that the upper and lower latch

switches 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 stan-

dards.

DOOR ADJUSTMENT

The door is adjusted by keeping the screws of each hinge loose. The lower oven hinge can be loosened.

After adjustment, make sure of the following :

1. Door latch heads smoothly catch the latch hook through the latch holes, and the latch head goes

through the center of the latch hole.

2. Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 .Omm.

3. The door is positioned with its face depressed toward

the cavity face plate.

4. Re-install outer case and check for microwave leakage around the 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 the oven cavity during the cook cycle. This function does not require that the door be air-tight, moisture (condensation)-tight or light-tight. Therefore, the occasional apperance of moisture, light or the sensing of gentle warm air

movement around the oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from the 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

LOWER OVEN HINGE

Page 39

MICROWAVE MEASUREMENT

After adjustment of door latch switches, monitor switch and doorare completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven.

REQUIREMENT

The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from external surface ofthe oven.

PREPARATION FOR TESTING:

Before beginning the actual test for leakage, proceed as follows;

Make sure that the test instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing.

Recommended instruments are:

NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275 +I 5ml of water initially at 20 +5”C in the center of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non-conductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.

4. Close the door and turn the oven ON with the timer set for several minutes. If the water begins to boil before the survey is completed, replace it with 275ml of cool water.

5. Move the probe slowly (not faster that 2.5cm/sec.) along the gap.

6. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven.

SHARP

Microwave leakage measurement at 5 cm distance

Page 40

-7

-I

E i? 51

F-

u1?

z”

w iz

2% 5

502

E is

xu. Fb 2%

Figure O-l. Oven Schematic-OFF Condition

SCHEMATIC

NOTE: CCNDITICN OFOVEN

1. DOOR UOSED.

2. COCKING TIME PRCGFIAMMED.

3,VARIABLE COKING 03NTROL”HIGW

4. START PAD TOUCHED.

SCHEM4TIC

NOTE: CONDITION OFOVEN

1. DOOR CLOSED.

2. “SENSOR 03oK” PAD TOUCHED

3. START PAD TOUCHED.

I w

3 E

1 1

Ii5

E i!

,LL .fj

0 z E

8 5

iTi

da"

I5 f5s 6 5d

-2

r-1

I - I

2 x0

;;

22” o-4

---

I-_

0 E

l-u gg

3 2%

+0 zs3 $2

- Figure O-2. Oven

Schematic-High

or Easy Defrost or Reheat Sensor Cooking Condition

Page 41

SCHEMATIC

NOTE: CONDITION WOVEN

1. DOOR CLOSED.

2. CONVECTION PADTOUCHED.

3. DES1 RED TEMO. PAD TOUCHED.

4. START PADTOUCHED.

0 9 us 2s

3 k 2 F 4: : 4

Figure O-3. Oven Schematic-Concection Cooking Condition

SCHEMATIC

NOTE: CONDITION WOVEN

1. DOORCLOSED.

2. MIXCOOKING PADTOUCHED.

3. DES1 RED TEMP. PAD TOUCHED.

4. START PAD TOUCHED.

Figure O-4. Oven Schematic-Automatic Mix Cooking Condition

Page 42

wr;;r--;prw..T

-=-tlIIIIl I

I I HIGH VOLTAGE COMPONENTS

ASYMMETRIC

7 III II

I III II

III

TFMP n-l--l

I I

1 MAGNETRON

POWER SUPPLY COED

Figure S-l Pictrial Diagram

I n I -n

I m I IFI I

t-4 I m I k

Page 43

HOUMS

tHdwva k&$g&a

-ITIEI R t

I I

I I I

I I I I I I

I I I I I I I I

r-------

! c----e-

4 I---.-.-.

sxwla a3lm3dS ION dl

VOLZSSC a3kll33dS ION 31

---#---

A9L/r110 0 a3lKGdS ION Al

--j +-

%STMP/L a314133dS ION dl +

3km

Ho1w

tl3dwa

tK)lWi

KlKElANO3

tiO.lOW

Nv’j

I /lllllllll~~

ZXsapLElCl

r-------

Eaoi J-v-l i

la-l =(f s1

i HgiH H3lHMI i Cl3W

: 6~1 S3d i

/ MO1 !A ! MO1 ’ _ <:=\- ’

L:~ (~ I(;.~;)'

-:a,- '

I if

680

Ci” I I I

#.I3tAn-‘T

.LIU.lzl I3

9NlLv3H

dkWl NW0

I I

)llwl \ANO$ ivno ,

LzlA

1” *

0,w

-“’ d @

Page 44

1 I

2 I

Figure S-3. Printed Wiring Boad

Page 45

R-9H!Xi

PARTS LIST

Note: The voltage supllied to the part “*” are greater than 250V.

REF. NO.

PART NO.

DESCRIPTION

ELECTRICAL PARTS

l- 1

RH-DZAOOSTWREO High voltage rectifier assambly

l- 2 FH-HZAOlOWREO

Thermistor assambly 1 AL

l- 3

QACCAA035WREO Power supply cord

l- 4 QFS-CAOlOWREO Fuse (M8A)

1 AE

l- 5

-- ..-.

Temperature fuse_l50'C QFS-TAO13WREO

_. _ _ _ .-- .-__-

l- 6 QFSHDA002WREO Fuse holder

1 AE

l- 7

QSOCLAOllWREO

Oven lamp socket

2 AH

l- 8 QSWMA009WREO Monitor switch

1 AF

l- 9

QSWMA051WREO

Stop switch and Damper switch (V5230D-600)

2 AF

l-10

QSW-MA051WREO Upper and lower latch switches(V-5230D-600)

2 AF

1-11 RC-QZA097WREO

High voltage capacitor

1 AW

l-12

RHET-A139WREO Convection heater

l-13

RLMPTA029WREO Oven lamp

2 AK

1-14 RMOTDA043WREO Damper motor

1 AQ

1-15 RMOTDA097WREO Turntable motor

1 AV

l-16

RMOTEA162WREO Cooling fan motor

1-17 PMOTEAl24WREO

Convection motor

1 AV

l-18

RR-WZA003WREO Monitor resistor

0.8R 2ow

l-19

RTHM-A024WREO Thermal cut-out 15O'C (OVEN)

l-20

RTHM-A035WREO Thermal cut-out 90-C (FM)

l-21

RTRN-A318WREO Power transformer

l-22

RV-MZA074WREO Magnetron

1BG

1-23 FDTCTA126WRKO

AH sensor assembly 1 Ax

2- 1 FDAI-A095WRYO

Base plate assembly

1AW

2- 2 FHNG-A092WRMO Oven hinge (Lower)

1AF

2- 3 GCABDA037WRWO

Rear cabinet

1 AU

2- 4 GCABUA404WRPO

Outer case cabinet 1 BB

2- 5 GCOVHA1565WRPC

Turntable motor cover

1AB

2- 6 GFTARAOOlWRWO

Oven lamp access cover

1 AC

2- 7 GLEGPA013WREO Foot

4 AB

2- 8 LANGKO243WRPO

Capacitor holder

1 AC

2- 9 LBSHC0032WREO

Cord bushing 1 AB

2-10 LSTPP0008YBEO

Cord anchorage (Upper)

1 AC

2-11 LSTPP0009YBEO

Cord anchorage (Lower) 1 AC

2-12 MLEVPAl22WRFO

Latch lever 1 AD

2-13

PCUSGAO23WRPO Cabinet cushion

1AA

2-14

PHOK-A043WRFO Latch hook

1AM

3- 1 DPWBFB097WRUO

Control unit (Not Replaceable

Item) 1 BR

3- lA

QCNCMA311DREO 2-pin connector (A)

1AB

3- 1B QCNCMA314DREO 3-pin connector (B)

3- 1c

QCNCMA319DREO 6-pin connector (E)

3- 1D QCNCMA145DREO 3-pin connector (F)

1AB

3- 1E QCNCWA030DREO

la-pin connector (G)

1AE

3- 1F

RV-KXA012DREO Fluorescent display tube

1AX

VCKYDllHF104Z Capacitor

O.luF 5ov

1 AB

RC-EZA192DREO Capacitor

1OOOuF 35v

1AD

VCEAB3lHW335M Capacitor

3.3uF

5ov

1 AA

c4 VCKYBllEX153N Capacitor 0.015uF

25V

1AA

VCEAB31CW476M Capacitor

47uF 16V

1AA

C6-7

VCKYDllCY103N Capacitor O.OluF

16V

2 AA

RC-KZA031DREO Capacitor

O.luF

25v

1 AA

Cl0

VCEAB31EW226M Capacitor

22uF 25V

1AA

Cl1

VCKYDllHF104Z Capacitor

O.luF 5ov

1AB

Cl3

VCKYDllHF104Z Capacitor

O.luF

5ov

1 AB

c20

VCKYDllCY103N Capacitor

O.OluF 16V

1AA

c21 VCKYF31HF103Z Capacitor O.OluF

5ov

1AA

C60-61

VCKYDllCY103N Capacitor O.OluF

16V

21 AA

c70

VCKYDllCY103N Capacitor O.OluF

16V

1AA

C80

VCEAB31HW104M Capacitor

O.luF 5ov

1AM

C81

VCEAB31VW475M Capacitor

4.7uF 35v

1AA

Cl04

RMPTEAOO9DREO Capacitor array 330pF x 4

1AE

CFl

RCRS-AOlODREO Ceramic filter (4.OOMHz)

1AD

Dl-4

RH-DZAOO6CBEO Diode (MPGOGG)

4 AA

Page 46

Note: The voltage supllied to the part “*” are greater than 25OV.

REF. NO.

PART NO.

DESCRIPTION Q’TY

D7 D70-71 D81-86 D89 D91-98

ICl

IC2

Q20 Q

Q60 Q80 Q81

082-83 Q84-86 Rl R2 R3 R4 R5

RlO R20 R40 R51 R60 R61 R62 R63 R64 R68 R70 R71 R80

R91-98 RlOO-103 R200 RYl RY2 RY3 RY4-6 SP40 Tl VRSl ZDl ZD3 3- 2 3- 3 3- 4 3- 5 3- 6 3- 7 3- 8 3- 9

4- 1

4- 2 4- 3 4- 4 4- 5 4- 6 4- 7

4- 8 4- 9 4-10 4-11 4-12

VHDlSS270A/-1 VHDlSS27OA/-1 VHDlSS270A/-1 VHDlSS27OA/-1 VHDlSS270A/-1 RH-IZA5OlDREO

RH-IZA495DREO VS2SB793///-4 VSDTAl43ES/lB VS2SA933S//-3 VSDTA143ES/lB VSKRC102M//-3 VSKRA102M//-3 VSDTD143EA/-4

RH-TZA097DREO VSDTA143ES/lB VRD-B12HF471J VRD-B12HF331J VRD-B12EF102J

VRD-B12HF561J VRD-B12EF153J VRS-B13AA360J VRD-B12EF153J VRD-B12EF332J VRS-B13AA331J VRD-B12EF102J VRD-B12EF472J VRN-B12EK753F VRD-B12EFlOlJ

V-RN-B12EK222F VRD-B12EFlOlJ VRD-B12EFlOlJ VRD-B12EF512J VRD-B12EF471J VRD-B12EF332J VRD-B12EF332J

VRD-B12EFlOSJ

RRLY-A084DREO RRLY-A083DREO RRLY-A088DREO

RRLY-A078DREO RALM-A007DREO RTRNPA023DREO RH-VZAOlODREO VHEMTZJl6C/-1 RH-EZA105DREO FPNLCB018WRKO JBTN-A606WRFO MSPRDA009WREO LANGTAl97WRWO ?ILEVFA042WRWO YLSFTTA030WREO XEPSD30PlOXSO YCPSD40P12000

FBRGMA002WREO FDUC-A124WRWO

FFANJ0034WRKO FFTA-A022WRKO FOVN-A144WRYO FROLPA045WRKO LANGFAO89WRWO LANGQA136WRWO LANGQA2 13wRwo LANGQA369WRPO LANGTAl96WRWO LBNDK0054WREO

Diode (lSS270A) Diode (lSS270A)

Diode (lSS270A) Diode (lSS270A) Diode (lSS270A) LSI Hybrid IC Transistor (2SB793) Transistor (DTA143ES) Transistor (2SA933S) Transistor (DTA143ES) Transistor (KRC102M) Transistor (KRA102M) Transistor (DTD143EA) Transistor (DTB143ES) Transistor (DTA143ES) Resistor 470 ohm 1/2w Resistor 330 ohm 1/2w Resistor

lk ohm 1/4w Resistor 560 ohm 1/2w Resistor 15k ohm

1/4w

Resistor

36 ohm 1w

Resistor 15k ohm

1/4w

Resistor 3.3k ohm

1/4w

Resistor 330 ohm

Resistor

lk ohm 1/4w

Resistor 4.7k ohm 1/4w

Resistor 75k ohm(F) 1/4W Resistor 100 ohm

1/4w Resistor 2.2k ohm(F) 1/4W Resistor 100 ohm 1/4w Resistor 100 ohm 1/4w Resistor 5.lk ohm

1/4w Resistor 470 ohm

1/4w Resistor 3.3k ohm 1/4w Resistor 3.3k ohm 1/4w Resistor

1M ohm

1/4w Relay (AJX3236 COl) Relay (OMIF-S-118LM) Relay (OMIF-S-118LMC) Relay (OJ-SH-118LM) Buzzer (PKM22EPT) Transformer Jaristor (15G471K) Zener diode (MTZJ16C) zener diode (RD4.3ESB2) zontrol panel frame with key unit 3pen button @en button spring zontrol panel back plate &en lever &en shaft ;crew;control unit mtg. ?rew;control panel back plate mtg.

1 2 6 1 8 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1

A-.

1 1 1 1 1

1 1 1 1 8 4 1 1 1

A-.

1 1 1 1 1 1 1 1 1 1

ZODt AA

AA AA AA AA

AW AL AC AB AB AB AA AA AC

-ACAB

AA AA

AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA

AA AA AA AA AK AK

AG AF AR AE AA AA BA AC AA AK

AC Ab AB AA

OVEN PARTS

Bearing assembly Steam duct assembly Cooling fan ass'y Damper ass'y &en cavity Roller stay Chassis support

Convection motor mounting plate Lamp socket mounting angle Thermal cut-out mounting angle Bearing mounting plate

Heater element holder

1AN 1A.F 1AE 1BQ

1AP 1AE 1AE 1AE 1AB 1AD

2 AB

Page 47

Note: The voltaae suDllied to the

Dart “*‘I are areater than 25OV.

REF. NO.

PART NO. DESCRIPTION

1 cm (CODE

Bearing holder plate Cord holder Damper cam Oven hinge (upper) Convection fan belt Turntable coupling Convection fan Pulley (M) Damper shaft

Turntable tray Waveguide cover AH sensor cover Transformer cushion D Magnetron duct cushion . Cushion Cushion

Steam cushion C Heater duct assembly Damper duct Cooling fan duct Thermal protection sheet (left) Thermal protection plate (left) Thermal protection sheet (right) Oven lamp screen Thermal protection plate (right) Cushion Thermal protection sheet Air guide (Bottom) Magnetron air guide Air guide (Right)

LFIX-A013WRWO

LHLDK0005YBFO MCAMPAO3OWRFO MHNG-A165WRMO NBLTKAOO5WREO NCPL-A021WRFO NFANMAo19WRwo NPLYBA025WRFO NSFTTA043WREO NTNT-AO19WRHO

PCOVPA157WREO

PCOVPA167WRFO

PCUSGA211WRPO

PCUSUA146WRPO

PCUSUO263WRPO

Pcusuo329WRPo

PCUSUO38OWRPO

FDUC-A140WRWO

PDUC-A269WRWO

PDUC-A270WRFO

PFPF-A138WREO

PREFHA028WRPO

PFPF-A139WREO

PGLSPA181WREO

PREFHA027WRPO

PCUSUA335WRPO

PFPF-A064WREO

PSKR-A153WRPO

PSKR-A171WRPO

PSKR-A161WRWO

PCUSGA221WRPO

4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-21 4-22 4-23 4-24 4-25

4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 4-43

2 AA

1AR 1AK 1AL 1 AK 1AM 1AF 1

AG 1AL 1AB 1AE 1AF 1AD 1AF 1AB

4-44

DOOR PARTS

1 BR

CDORFA584WRKO

Door assembly,complete.

5- 1

DDORFA262WRYO Door panel

5- 2

GCOVHAl55WRFO Choke cover

5- 3

GWAKPA142WRFO Door frame

5- 4

HDECQA123WRFO Door sash (right)

5- 5

HDECQA124WRFO Door sash (left) 5- 6 LSTPPA045WRFO Upper latch head 5- 7

LSTPPA046WRFO

Lower latch head

5- 8

MSPRTA007WREO Latch spring

MISCELLANEOUS

High rack

Low rack

A??

Cook book

Operation manual

1 AK

Wire holder (WH-1 84mm )

1 AA

Main wire harness

1 BA

High voltage wire A

1 AD

High voltage wire B

1 AD

Thermistor harness

1 AM

Fuse label

1 AB

Wire holder (Purse lock "L")

1 AA

Connector CE-230

1 AA

Caution label

2 AC

Name plate

1 AD

Menu label

1 AD

6- 1 FAMI-AO59WRMO 6- 2 FAMI-AO58WRMO 6- 3

TCAlXA480WRRO 6- 4

TINSEA602WRRO 6- 5

LBNDKOO12YBEO 6- 6 FW-VZB232WREO 6- 7 QW-QZA099WREO 6- 8

QW-QZAlOOWREO 6- 9 FW-VZA59lWREO 6-10

TLABSA018WRRO 6-11

LHLDWQ004YBEO 6-12

QTANP0020YBEO 6-13 TCAUH0114WRRO 6-14

TSPCNB863WRRO 6-15

TLABNA178WRRO

SCREWS, NUTS AND WASHERS

XHTSD40P08RVO Screw; 4mm x 8mm

LX-BZ0202WREO

Special screw

LX-CZA020WREO

Special screw

LX-CZ0017WREO

Special screw

LX-CZ0043WREO

Special screw

1 AA 2 AB 6

7- 1

7- 2 7- 3 7- 4 7- 5

Page 48

Note: The voltage supllied to the part “*” are greater than 25OV.

REF. NO. PART NO.

DESCRIPTION

Q’TY CODI

7- 6

LX-CZ0052WREO

Special

screw

2 AA

7- 7 LX-CZ003OWREO

Special

screw

2 AA

7- 8 LX-NZ0029YBEO

Nut

1AA

7- 9

XBPSD3OP14KOO Screw; 31m-1 x 14mm

1AA

7-10

XBPSD40P06KOO Screw; 4mm x 6mm

2 AA

7-11 XBPSD4OP25000 Screw; 4mr1 x 25mm

2 AA

7-12 XFPSD40P25000 Screw; 4mm x 25mm

2 AA

7-13 XBTUW40P06000 Screw; 4mm x 6mn

3 AA

7-14 XBTWW4OPO6000 Screw; 4mm x 6mm

4 AA

7-15 XCPSD30P06000 Screw; 3n-m x 6mm

5 AA

7-16 XOTSD40P08000 Screw; 4rm-1 x 8mm

4 AA

7-17

XCPSD30P08XOO Screw; 3mm x 8mm

6 AA

7-18 XCPSD30P08000 Screw; 3mm x 8mm

3 AA

7-19 XCPSD40P08000 Screw; 4mm x 8mm 8 AA 7-20 XCTSD40P08000 Screw; 4rmn x 81mn 3 AA 7-21

XFPSD3OP08000 Screw; 3mm x 8mm

2 AA

7-22

XFPSD40P08KOO Screw; 4mm x 8mm

4 AA

7-23

XFPSD40P08000 Screw; 4m x 8mm 5 AA 7-24 XFPSD60P14JSO Screw; 6mm x 14mm 2 AA 7-25

XNESD40-32000 Nut; 4rnm x 3.2mm

4 AA

7-26

XNEUW40-32000 Nut; 4mm x 3.2mm 1AA 7-27

XOTSE40P12000 Screw; 4mm x 12mm

4 AA

7-28

LX-CZO047WREO

Special screw 11 AA

7-29

* XOTSD40P12000 Screw; 4mm x 12mm 7 AA

7-30 t-

XWSUW40-10000 Washer; 4mn x in-an 1AA

7-31

XWWSD60-08000 Washer; 6mm x 0.8mm

1AA

7-32 '

XFPSD3OPlOOOO Screw; 31tm x 1Omm 1AA

7-33

LX-WZA022WREO Washer 1AA

7-35

XHTSD40P08RVO Screw; 4mn x 8m-1 4 AA

7-36

LX-WZAOO4WREO Washer

1AA

HOW TO ORDER REPLACEMENT PARTS

To have your order filled promptly and correctly, please furnish the following information.

1. MODEL NUMBER

3. PART NO.

2. REF. NO.

4. DESCRIPTION

Page 49

0 m

Page 50

R-9H55

CONTROL PANEL PARTS

DOOR PARTS

3-5

-cl

3-9

Page 51

1 2

I 3

MISCELLANEOUS

6-l

6-2

(H.V.C)

(MG-)

B--e

may be

different than illustration.

(H.V.C)

(H.V.T.)

PACKING AND ACCESSORIES

TRAY HOLDER

TURNTABLE TRAY

INSTRUCTION BOOK

AND COOK BOOK

MICROWAVE OV

l Not replaceable items.

5 I

Page 52

SHARI=

'93 SI+MJ CORP (07KO 75E) Prtnted in Austraha