Sharp R-9A53 Service Manual

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Page 1

R-9A53

SHARP SERVICE MANUAL -

S811 OR9A53J//

CONVECTION

MICROWAVE OVEN

MODEL

R-9A53 -

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

condition and only manufacturer original spare parts must be used.

(RD16101 U)

TABLE OF CONTENTS

Page

GENERAL IMPORTANT INFORMATION

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

CAUTION, MICROWAVE

RADIATION,WARNING

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

PRODUCT SPECIFICATIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..I...................................... 2

APPEARANCE VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*.....*.................

OPERATION SEQUENCE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*......... 4

FUNCTION OF IMPORTANT COMPONENTS

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

SERVICING ,,..........,.............,...............................................................,.....*.....................................................*

TEST PROCEDURE

. . . . . . . . . . . . . . . . ..‘........................................~........................................................................‘...

TOUCH CONTROL ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*.........*..................................

COMPONENT REPLACEMENT AND

ADJUSTMENT

PROCEDURE

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

MICROWAVE MEASUREMENT

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

WIRING DIAGRAM

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

PICTORIAL DIAGRAM

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

CONTROL PANEL CIRCUIT

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

PRINTED WIRING DIAGRAM

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

PARTS LIST

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

PACKING AND ACCESSORIES

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

‘12

20 27 I

33 34 36

37 38 39 44

SHARP CORPORATION

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R-9A53

Page 3

SERVICE MANUAL

SHARF’

COUNTER TOP

CONVECTION MICROWAVE OVEN

R -9A53

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 and Base Model manual, so 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 and gaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveouide or antenna while the device is energized.

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 250V.

SHARP CORPORATK)N

OSAKA, JAPAN

PRODUCT DESCRIPTION

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R -9A53

Page 4

I-9A53

ITEM

Power Requirements

Power Consumption

Power Output

Convection Heating element

Power Output Case Dimensions Cooking Cavity Dimensions Control Complement

Set Weight

PRODUCT DESCRIPTION

SPECIFICATIONS

DESCRIPTION

240 Volts 50 Hertz Single phase, 3 wire earthed

1500W (Microwave) 1600W (Convection)

750 watts nominal of RF microwave energy (2 litre water load) 850 watts (IEC-705 1988) Operating frequency of 2450MHz

1500w

Width 627mm Height 378mm Depth 481 mm Width 41 Omm Height 245mm Depth 41 Omm

Touch Control System Clock( I:00 - 12:59 ) Timer (0 - 99 min. 99sec. )

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 MIX, BAKE . . . . . . . . . . . . . . . . . . . . 180°C with 10% microwave power

HIGH MIX, ROAST . . . . . . . . . . . . . . . .

200°C with 30% microwave power

SLOW COOK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130°C for 4 hours (no preheat)

GRILL

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

250°C (preheat)

INSTANT ACTION, MULTI COOK ,VARIABLE COOKING CONTROL pads

AUTO START/CLOCK pad, EASY DEFROST pad, STOP/CLEAR pad

MEMORY pad, INSTANT COOK/START pad

Approx. 30.0 kg

GENERAL INFORMATION

WARNING-THIS APPLIANCE MUST BE EARTHED

IMPORTANT .

1 The wires in this mains lead are coloured in accordance with the following code:

Green-and-yellow

: Earth

Blue

: Neutral

Brown

: Live As the colours of the wires in the main lead of this appliance may not correspond with the coloured marking identifying the terminals in your plug, proceed as follows: The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol & or coloured green or green-and-yellow.

The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red.

Page 5

R-9A53

APPEARANCE VIEW

1. Ventilation openings

6. Oven lamps

2. Access cover for oven lamp

7. Coupling

*Place the roller stay on the

coupling in the oven and seat the turntable on the roller stay.

11. Waveguide cover

12. Roller Stay

replacement

3. Hinges

4. Safety door

latches

5. See through door

8. Door open button

13.

Turntable

Touch Control

Panel 14.

Low rack

10.

Lighted digital

display

15.

High rack

Touch Control Panel

MULTI COOK PAD

Touch to select Multi Cook mode

MULTI COOK MENUS CONVECTION COOKING

FUNCTION PADS

INSTANf ACTION -

iTii&q~

tion.

NUMBER AND TEMPERATURE PADSI

1 1 9 Frozen veoetables

Touch to enter cooking times, clock time, convection temperature or to select the Multi Cook menus.

10 Jacket potato -~

LOW’ MIX HIGH’ MIX

BAKE

ROAST

MEMORY PAD

Touch to enter one frequently used cooking programme. Touch to recall the memorized programme.

VARIABLE COOKING CON-

power setting. if not touched, HIGH is automatically selected.

STOP/CLEAR PAD-----,

INSTANT ACTION PADS

Touch once to cook or reheat 4 popular menu.

,-2 SERVE QUANTITY PAD

To cook two serves, touch this pad prior to touching the INSTANT ACTION pad.

-3 SERVE QUANTITY PAD

To cook three serves, touch this pad prior to touching the INSTANT ACTION pad.

7 200%

8 220-c

9 230%

4 SERVE QUANTITY PAD

To cook four serves, touch this pad prior to touching the INSTANT ACTION pad.

-EASY DEFROST PAD

Touch to defrost meat by en-

tering weight only.

-MORE(n), LESS(v) PADS

Touch to increase/decrease the time in one minute increments during cooking or to alter the doneness for the Instant Action, Multi Cook or Easy Defrost modes.

Touch to erase during programming. Touch once to stop operation of oven during cooking; touch twice to cancel cooking programme.

AUTO START/CLOCK PAD-

Touch to set clock or auto

start time.

INSTANT COOK/START PAD

Touch once to cook for 1 minute at HIGH or increase by

. .

1 minute multiples each time this pad is touched during microwave, convection, grill or mix cooking.

Page 6

[R-9A53

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions

feed-box, and then into the cavity where the food

during oven operation.

is placed to be cooked.

Relay and Components Connection

RELAY CONNECTED COMPONENTS

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

fly-1 RY-2 RY-3

oven lamp/turntable motor power transformer

convection heater RY-4 damoer motor RY-5

convection motor

RY-6 fan motor

OFF CONDITION

Closing the door activates both door -interlock switches: upper latch switch, lower latch switch and stop switch.

(In this condition, the monitor switch contacts are opened.) When oven is plugged in, 240 volts A.C. is supptied to the control unit. (Figure O-l).

1. The display will show flashing “88:88”. To set any program or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and

: will appear and count up every min-

ute.

Note: When the door is opened, the oven lamp comes

on.

2. A signal is input to the control unit, energizing the coil of shut-off relay (RY4). RY4 contacts close, completing a circuit to the

damper motor. The damper motor now operates moving the damper to the open position, thereby closing the contacts of the damper switch inputs a signal to

the control unit. The coil of relay RY4 is de-energized, opening its contacts, thereby turning off the damper motor.

COOKING CONDITION HIGH COOKING

Program desired cooking time and Variable Cooking Control by touching the 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 connected to the relays are turned on (RYI, RY2,

RY6). (For details, refer to Figure O-2)

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

3.35 volts A.C. output on the filament winding, and approximately 2120 volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.

4. The microwave energy produced by the magnetron

is channeled through the waveguide into the cavity

7. The monitor switch is electrically monitoring the operation of the upper latch switch and is mechanicaliy associated with the door so that it will func-

tion in the following sequence.

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

the upper latch switch and lower latch switch open their contacts,

and then the monitor

switch contacts close.

(2) When the door is closed from the open posi-

tion, the monitor switch contacts first open, and then the contacts of the upper latch switch

and lower latch switch close. 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.

MED HIGH, MED, MED LOW (DEFROST), LOW COOKING

When Variable Cooking Power is programmed, the 240

volts A.C. is supplied to the power transformer

intermittently through the contacts of relay( RY-2) which is operated by the control unit within a 32 second time base. Microwave power operation is as fol-

lows:

VARI-MODE - ON TIME OFF TIME

HIGH 32 sec. 0, sec. (100% power)

MED HIGH 24 sec. 8 sec. (approx. 70% power)

MED 18 sec. 14 sec. (approx. 50% power)

MED LOW (DEFROST) 12 sec.

20 sec.

(approx. 30% power) LOW

6 sec.

26 sec.

(approx. 10% power)

Note: The ON/OFF time ratio does not correspond

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

Page 7

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: I. The coil of shut-off relays (RYI, RY5 and RY6) are

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

2. ?Ek 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 convection heater.

4. When the oven temperature reaches the selected

preheat temperature, the following operations occur: 4-l. 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: I, The numbers of the digital readout start the count

down to zero.

2. The oven lamp, turntable motor, cooling fan motor

and convection motor are energized.

3. Heater relay (RY3) is energized (if the cavity tem-

perature is lower than the selected temperature) and the main supply voltage is applied to the convection heater to return to the selected cooking temperature.

4. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 9O”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 90°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.

5. At the end of the convection cook cycle, shut-off relay (RY4) is energized turning on the damper motor. The damper is returned to the open position,

closing the damper switch contacts which send a signal to the control unit, de-energizing shut-off relay (RY4).

AUTOMATIC MIX COOKING CONDITION

Program desired cooking time and temperature by touching the number pads and the LOW MIX/BAKE or HIGH MIX/ROAST pad When the START pad is touched, the following operations occur:

1. The numbers of the digital readout start the count

down to zero.

2. The shut-off relay (RYI, RY5 and RY6) are ener-

gized, 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 sup-

ply alternately within a 32 second time base,

convection heat and microwave energy.

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

Note: The ON and OFF time ratio does not correspond

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

WCR0.l

‘ON

CONVECTION TEMPERATURE

- lao°C

Low MIX’

BAKE

- Appror. 30%

I I I

CONVECTION TEMPERATURE

tCONVEC.1

OFF

-ZOO?

32 Y.

HIGH MIX

-ROAST

1 i

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Page 8

-9A53

/ Note: During alternate Microwave/Convection operaI

tion, the convection heater is energized only if

the cavity temperature drops below the set tem-

perature.

MULTI COOK

MULTI COOK will automatically compute the oven

temperature, microwave power and cooking time for

j baking, roasting and broiling.

Set the desired program by touching the MULTI COOK ; pad, and number pad. j 1 Enter the weight by touching the Number pads

When the START pad is touched, the following operations occur:

1 I 4.

The COOK indicator will light and the Convection

Fan Symbol will rotate. 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. The shut-off relays (RYI, RY3, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The power supply voltage is added to the convection heater. Now, the oven is in the convection cooking mode.

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

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 defrost 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.

Page 9

R -9A53

DESCRIPTION AND FUNCTION OF COMPONENTS

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 CPU unit causes the heater relay to operate, thus the current to the convection heater is turned ON/OFF.

OVEN THERMAL CUT-OUT

The oven thermal cut-out located on the right 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 tem-

peratures 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.

MONITOR SWITCH

The monitor switch is mounted on the latch hook. It

is activated (the contacts opened) by the upper 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 fail to open when the door is opened.

Functions:

1. When the door is opened, the monitor switch con-

tacts 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 are in

the OFF condition (contacts open) due to their

being normally open contacts switch.

2. 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.)

3. If the door is opened during cooking, and the common and normal open contacts of upper latch switch fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION:BEFORE REPLACING A BLOWN FUSE

TEST THE UPPER LATCH SWITCH AND

MONITOR

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

AFTER REPLACING FUSE ALSO REPLACE

MONITOR SWITCH.

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.

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

LATCH HEAD

DOOR OPEN BUTTON

Figure D-l. Upper Latch Switch, Lower Latch

Switch, Monitor Switch and Stop Switch

CONVECTION HEATER

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

1 1

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Page 10

iR-9A53 I

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 tem-

perature is above 9O”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 90X., 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

I. When power supply cord is plugged in:

I-l. When power supply cord is plugged in, a sig-

nal is sensed in the control unit, and operates

shut-off relay (RY4).

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

damper motor is energized, opening the damper door.

1-3. When the damper is moved to the open posi-

tion by the damper cam, damper switch is closed (ON position).

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

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

1-5. 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-l. Damper motor is energized by touching the

convection, temperature and START pads.

3-2. When damper is

in the closed position

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

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

during the convection cooking operation.

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

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

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

closed durin convection or open durning

microwave, the control unit will stop oven op-

eration after 1 minute.

Cooking Mode Microwave cooking Convection cooking Sensor cooking

Operation of Damper OPEN CLOSE

OPEN Automatic mix cooking Grill cooking

CLOSE Slow cooking

(RD72002U)

DAMPER SHAFT

DAMPER DUCT

DAMPER CAM

DAMPER SWITCH

HAMPER MOTOR

Figure D-l. Damper Mechanism

Page 11

R-9A53

]

SERVICING

TROUBLESHOOTING GUIDE

forming the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be

found in the “Test Procedure”section.

When troubleshooting the microwave oven, it is IMPORTANT: If the oven becomes inoperative be-

helpfull to follow the Sequence of Operation in per-

cause of a blown fuse in the monitor

1 I

I 1 :

switch and upper latch switch circuit, check the monitor switch and upper latch switch before replacing the fuse.

If the fuse is replaced, the monitor

switch should be replaced at same

time.

Page 12

Problem

IFF :ONDTION

Home fuse blows when power cord is plugged into wall receptacle. Fuse blows when power cord is plugged into wall receptacle. 88:88 do not appear in display when power cord is

first plugged into wall outlet.

Display does not operate properly when STOP/CLE AR Key is touched. (Beep should sound and trme of day should appear in display.)

Oven lamp light and turntable rotate when door

closed.

Oven lamp does not tight with door opened.

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

IOKING ONDTION

Oven lamp does not light at all.

Oven lamp lights, but turntable motor does not ooerate.

Cooling fan motor does not operate

Oven does not go into a cook cycle when START i

MICRO-

WAVE

Oven seems to be operating but little or no heat is

~ pad is touched. .

produced in oven load (Food incompletely cooked

or not cooked at all at end of cook c cle.

y ,

Oven goes ,to a cook cycle but extremely uneven heating is produced in open load(food).

Oven does not cook properly when programed for

MEDIUM etc. cooking powers.(Operates properly

on HIGH) Oven does not cook properly when programed in

EASY DEFROST cooking mode. CONV indicator light but oven does not go into a cook cycle when START pad is touched. CONV indicator lights, but heating element does not heat.

ONVEC-

ION

I I

I 4

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

Convention cycle runs 1 minute then shuts down.

Convection cycle runs 3 minutes then shuts down.

;ENSOR)

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Page 13

R-9A53

/ I

1 1

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Page 14

b-9A53

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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 re laced.

(R g 82AOl U)

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. When P(W) heating works for t(second), approximately P x t/4.2 calorie 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 the water is V x AT.

The formular is as follows;

Pxt/4.2=VxAT

P (W) = 4.2 x V x AT / t

Our condition for the water load is as follows:

Room temperature . . . . . . . . . . . . . . . . . . . . . around 20°C

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

Water load

. . . ...2000 ml Initial temperature

. . . . . . . IO+1 “C Heating time . . . . 1 min. 52 sec.

P=75xAT

Measuring method:

A) Use two 1 litre Pyrex beakers with a diameter of approximately of 12cms.

B) Place 1 litre of 10°C water in each beaker.

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 beakers as touching each other in the centre of the cavity. E) Set the timer to 1 minute 52 seconds at 100% power (the time required to raise the water

temperature 10 degrees C.)

F) The time must be measured with stopwatch or wristwatch.

G) After 1 minute and 52 seconds, stop the oven by opening the door.

H) Remove the two beakers from the oven and measure the temperature of the water by stiring the

water with the thermometer and noting the readings.

Example

Initial temperature

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

10°C T2 = 11 “C

Temperature after 1 min. 52 sec.

Tl = 20°C T2 =

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

21 “C

Temperature difference Cold-Warm

........................................... AT1 = 10°C AT2 = 10°C

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

AT = (AT1 +AT2) / 2 = (10°C + IO’C) / 2 = 10°C

Measured output power

The equation is “P= 75 x AT”

P= 75 x 10°C = ................................................... 750 Watts

NOTE: The measured output power should be at least +I5 % of the rated output

power.

CAUTION: 1°C CORRESPONDS TO 75 WATTS.

REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

Page 15

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

(Tl OC)

(T2 OC)

Heat up for 1 min. 52 sec.

MICROWAVE OUTPUT POWER (IEC-705-1988)

(RD82A02U)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted). Microwave output power from the magnetron can be measured by way of IEC 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 t/4.1 87 calorie , 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 the water is V x AT.

/ / The formular is as follows;

Pxt/4.187=VxAT

l-.----

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+ 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 fest.

3. Temperature of the water The initial temperature of the water is (I 0 f 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 f 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.

Page 16

R-9A53

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

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.

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of (1'0 & 2) “C.

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

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

7. Caluculate 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 f15 % of the rated

output power.

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

INSUFFICIENT.

T2”C

Heat up for 51 sec.

(RD8:

903U)

POWER TRANSFORMER TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-

NENTS OR WIRING.

Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be approx. 1.3 ohm and the resistance of the high voltage coil should be approximately 72 ohms; the resistance of the filament coil should be less than 1 ohm.

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

(RD82401 U’)

Page 17

R-9A53

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

HIGH VOLTAGE RECTIFIER AND RECTIFIER TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-

NENTS OR WIRING.

HIGH VOLTAGE RECTIFIER TEST

Isolate the high voltage rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the high voltage rectifier terminals and observe meter reading. If a short is indicated in both directions, or if an infinite resistance is read in both directions, the high voltage rectifier is probably defective and should

be replaced.

ASYMMETRIC RECTiFlER TEST

Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals, reverse the leads to the rectifier terminals and observe meter reading. If an infinite resistance is read in both directions, the rectifier is good. If a short is indicated in either direction, the one is probably defective and should be replaced.

D HIGH VOLTAGE CAPACITOR TEST

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

If the capacitor is open, no high voltage will be available to the magnetron. Disconnect the input

leads and check for short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate approximately lOMf2 once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case. If it is shorted, replace the capacitor.

(RD82603U)

E SWITCH TEST

Isolate the switch and check the contacts by using an ohmmeter using the following table. If improper operation is indicated, make the necessary switch adjustment or replacement.

Table: Switch Connection

Connection

Common Terminal-Normally Open Terminal Common Terminal-Normally Close Terminal

(COM) (NO)

(COM)

(NC)

Operation

Plunger released Open circuit

Close circuit

Plunger pushed Closed circuit

Open circuit

CRD82701 U)

Page 18

-9A53

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

F MONITOR SWITCH TEST

Before performing this test, disconnect oven from power supply and make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows.

When the door is open, the meter should indicate a closed circuit. When the monitor switch actuater is pushed by a screw driver through the latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch

is pushed in), the meter should indicate an open circuit. If improper operation is indicated, replace the defective switch.

After testing the monitor switch, re-connect the wire lead to the monitor switch (NC) terminal.

LOWER LATCH HOLE \

SCREW DRIVER

- ‘LOWER LATCH SWITCH

G BLOWN FUSE

If the fuse in the upper latch-monitor switch circuit is blown when the door is opened, check the upper latch switch and monitor switch accord(ing to the Test Procedure for those switches, before replacing the blown fuse.

If the fuse is replaced, the monitor switch should be replaced at the same time.

If the fuse is blown by improper switch operation, adjust or replace the defective switch, fuse at

the same time.

Replace the fuse and monitor switch, even if the switches operate normally CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.

(RD82C03U’)

MAGNETRON TEMP. FUSE TEST

A continuity check across the temp. fuse terminals should indicate a closed circuit unless the temperature of the temp. fuse reaches approximately 145°C. An open magnetron temp. fuse indicates overheating of the oven cavity. If the temp. fuse indicates an open circuit, replace the temp. fuse and check for restricted air flow to the magnetron

through the vent holes of the oven cavity, especially the air duct and cooling fan ass’y.

Or an open oven temp. fuse indicate overheating of oven cavity.

Replace the oven temp. fuse and check inside of the oven cavity and unproper setting of cooking

time or accident of the timer.

IRD82G05U’)

Page 19

R-9A53

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER COMPONENT TEST

I OVEN THERMAL CUT-OUT

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 150°C. The termal cut-out resets automatically at approximately 130°C.

If the thermal cut-out has opened under the normal condition, replace the same one is parts list.

An open thermal cut-out indicates overheating of the heater unit. Check for restricted air flow to the heater unit through the vent holes of the oven cavity, especially the heater duct and convection fan.

FAN THERMAL CUT-OUT TEST

A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 90°C. The termal cut-out resets automatically at approximately 70°C. An open thermal cut-out indicates locking the fan motor running and brocking the vent hole on the unit. Check for restricted air flow to the magnetron through the opening in the chassis, especially the cooling duct and cooling fan motor.

CONVECTION HEATER TEST

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

resistance between the convection heater terminals should be approximately 37.5 ohms.

b. Disconnect wire leads and measure the insulation resistance with 500V - 1 OOMQ insulation

resistance meter. The insulation resistance between convection heater terminal and cavity should be more than 1 OOMR.( However when convection heater is hot more than 0.5MR)

THERMISTOR TEST

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

ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.

Room Temp.

Resistance

20°C - 30°C Approx. 300R - 192Q

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

L DAMPER MOTOR TEST

When the power cord is plugged into the wall receptacle, and 240 volts A.C. is supplied to the damper motor the motor operates until the damper is opened and the damper switch closes. Then the damper motor stops operation.

If the damper motor does not operate, check for AC voltage with a voltmeter at the motor.

1. Disconnect the power cord from the wall receptacle.

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

3. Reconnect the power cord into the wall receptacle.

If 240 volts A.C. is indicated at the wire leads, replace the motor. Not indicated, check the wire harness and the control unit.

DAMPER SWITCH TEST

Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM) and normally open (NO) terminals of the switch.

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

2. When the power cord is plugged into the wall receptacle, the damper motor operates and damper cam starts to rotate. The switch actuator is released the meter should indicate an open circuit.

If improper operation is indicated, replace the damper switch.

Page 20

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with

only a voltmeter and ohmmeter.

In this service manual, the touch control panel assembly is di-

vided into three units, Control Unit, Key Unit and Relay Unit , troubleshooting by unit replace-

ment 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. Repair the control unit. 2-l 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 up. 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.

0 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 operation.

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

DC. voltage not indicated

. . . . . . ..Check diode which is connected to the relay coil. If diode is

good, control unit is defective.

RELAY SYMBOL OPERATIONAL

CONNECTED COMPONENTS

VOLTAGE

RYl

Approx. 13 V. D. C. RY2(COOK) Approx. 13 V. D. C. RY3(HEATER)

Approx. 13 V. D. C.

Oven lamp and Turntable motor Power transformer Heating element

1 RY4 1 Approx. 14V.D.C. 1

Damper motor

1 Aoorox. 14 V. D.C. 1

Convection motor

RY6

. .

1 Approx. 13 V. D.C. 1

Cooling fan motor

Page 21

R-9A53

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

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 serves as a substitute coil. If the foil pattern is open, follow

the troubleshooting guide given below for repair.

Problem: POWER ON, indicator does not linht UP. Problem: POWER ON, indicator does not light up.

STEPS STEPS

OCCURANCE OCCURANCE CAUSE OR CORRECTION CAUSE OR CORRECTION

1 1

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

of CPU connector (CN-A) of CPU connector (CN-A)

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

transformer. transformer.

Check and repair. Check and repair.

3 3

Only pattern at “a” is broken. Only pattern at “a” is broken.

*Insert jumper wire 1 and solder. *Insert jumper wire 1 and solder.

4 4 Pattern at “a” and “b” are broken. Pattern at “a” and “b” are broken.

“Insert the coil RCILF2003YAZZ between “c” and “Insert the coil RCILF2003YAZZ between “c” and

“d”. “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 condition is detected, replace the defective parts.

I I I

I /

I 1 I

I /

/ I

Page 22

p-9A53

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following

units as shown in the touch control panel circuit. (I ) 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

P01,P02,P05,P07,P10, Pll,P13 and P14. 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 and indicator circuit.

1) LSI

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

(RD916Al IJ)

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 a signal resetting the LSI to the initial state when power is applied.

5) Buzzer Circuit

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

6) 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 meas-

urement circuit and the result applied to LSI. The LSI uses this information to control the relay and display units.

7) Stop Switch

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

8) Relay Circuit

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

9) Indicator Circuit

Indicator element is a Fluorescent Display.

Basically, a Fluorescent Display is a 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.

Page 23

R-9A53 :

DESCRIPTION OF LSI

LSI(IZA388DR)

The I/O signals of the LSl(lZA388DR) are detailed in the following table.

PIN NO. 1 1

1 SIGNAL 1 VREF

I/O

Reference voltace input terminal.

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

(RD93GA6U)

PIN NO. 1 2

1 SIGNAL 1 IN7

Terminal to change cooking constant.

Connected to GN D. PIN NO. / 3

1 SIGNAL 1 IN6

Terminal not used. Connected to VC.

I/O

1 IN

I/O

1 IN

PIN NO. 1 4

1 SIGNAL 1 IN5

Terminal to change cooking constant.

Connected to GND. PIN NO. 1 5

1 SIGNAL / IN4

I/O

/ IN

I/O

j IN

Input signal which communicates the damper open/close information to LSI.

Damper opened ;

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

PIN NO. ) 6

1 SIGNAL 1 IN3

l/O

/ IN

Terminal not used.

PIN NO. 1 7

SIGNAL 1 IN2

I/O

Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into

temperature by the A/D converter built into the LSI.

(RD935Al U)

PIN NO.

1 8-9

1 SIGNAL 1 IN1 -INO

Terminal not used. Connected to GND.

PIN NO. 1 IO-14

SIGNAL j P47-P43

Terminal not used.

l/O

/ IN

I/O

1 OUT

PIN NO. / 15

1 SIGNAL 1 P42

I/O

j OUT

Timing signal output terminal for temperature measurement(OVEN).

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

PINNO. I16

Terminal not used.

1 SIGNAL / P41

(RD935A6U)

I/O

1 OUT

PIN NO. 17 1 SIGNAL j P40

I/O

j OUT

Cooling fan motor driving signal.

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

PIN NO. j 18 1 SIGNAL

P37

I/O

/ OUT

Convection motor driving signal.

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

! I

i i

]

Page 24

PIN NO. 1 19

1 SIGNAL / P36

I/O

/ OUT Terminal not used. PIN NO. 20

1 SIGNAL 1 P35

l/O

/ OUT

Heating element driving signal.

To turn on and off heater relay( RY3).

“L”level during convection cooking;

“H”level otherwise. During convection

cooking, the signal becomes

“H”level when the temperature of the oven cavity exceeds the predetermined tem-

perature.

PIN NO. / 21

1 SIGNAL 1 P34

I/O

1 OUT

Oven lamp and Turntable motor driving signal (Square waveform: 50Hz).

To turn on and off shut-off relay{ RYI ). The square waveform voltage is delivered to the relay RYI driving circuit and relays (RY2,RY3,RY5) control circuit.

20 muc.

il-

AL-L-

During cookmg

PIN NO. j 22

I=-

-9A53

1 SIGNAL / P33

I/O

1 OUT

Magnetron hiah-voltage circuit driving signal.

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

In high operation, the signals holds “L” level during

HIGH I

microwave cooking and “H” level while not cooking.

In other cooking modes (MED HIGH, MED, MED

-z,ON

MED HIGH -

24 YC

6 sec.

LOW, LOW) the signal turns to “H” level and “L”

level in repetition according to the power level.

OFF

MED

MED Low.12sdr-

-ON

H CND

LOW

26 sec.

-r-

6s~.

- OFF

-L

PIN NO. 23

1 SIGNAL 1 P32

I/O

; OUT

Signal to sound buzzer.

A: Key touch sound. B: Completion sound.

C: When the temperature of the oven cavity reaches the

preset temperature in the preheating mode, or when

the preheating hold time (15 minutes) is elapsed.

0.12 UC.

. .

1.2 H CND

PIN NO. j 24

1 SIGNAL 1 P31

I I/O

1 IN

Signal to svnchronize LSI with commercial power source frequency.

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

I-l-J- H.GND

I- 20mrrc. J---- L(-5vI

Page 25

R-9A53

PIN NO. 1 25

1 SIGNAL 1 P30

I/O

1 OUT

Damper motor relay driving signal.

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

‘OFF

H GNO

ON,

---m--L

PIN NO. / 26

1 SIGNAL 1 CNVSS

l/O

Connected to VC

PIN NO. 1 27

1 SIGNAL / RESET

I/O

1 IN

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.

PIN NO. 1 28

1 SIGNAL 1 XIN

I/O

1 IN

Internal clock oscillation frequency setting input.

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

PIN NO. / 29

1 SIGNAL 1 XOUT

I l/O

) OUT

Internal clock oscillation frequencv control output.

Output to control oscillation input of XIN. PIN NO. / 30/31

1 SIGNAL 1 XCINIXCOUT

Terminal not used.

I/O

1 IN/OUT

PIN NO. 32

1 SIGNAL

vss

Power source voltage: -5V.

VC voltage of power source circuit input.

PIN NO. j 33

1 SIGNAL j 0

Terminal not used.

I/O

1 OUT

PIN NO. / 34

1 SIGNAL j R3

l/O

1 IN

Signal coming from touch kev.

When any one of G-l

line keys on key matrix is touched, a corresponding signal from PO1 ,PO2,PO5,PO7,P1O,P11 ,P13 or PI 4 will be input into R3. When no key is touched, the signal is held at “L” level.

1 SIGNAL j R2

PIN NO. 35

I/O

I /

Sianal similar to R3

When any one G-2 line keys on key matrix is touched, a corresponding signal will be input R2

PIN NO. / 36

1 SIGNAL 1 RI

I/O

/ IN

Signal similar to R3

When any one G-3 line keys on key matrix is touched, a corresponding signal will be input RI

PIN NO. 1 37 1 SIGNAL j RO

I/O

1 IN

Signal similar to R3

When any one G-4 line keys on key matrix is touched, a corresponding signal will be input RO

PIN NO. 1 38

1 SIGNAL / VP

l/O

j IN

Anode (segment) of Fluorescent Displav light-up voltage: -28V.

VP voltage of power source circuit input.

PIN NO. / 39 1 SIGNAL 1 PI7

I/O

1 OUT

Terminal not used.

Page 26

(-9A53

PIN NO. 1 40

Segment data signals.

1 SIGNAL / PI6

I/O

/ OUT

The relation between signals and indicators are as follows:

Signal

Segment

Signal

Segment

PI6

. ..*..........,.,......................

LB2 PO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . g

PI4

..,.,.,,.,,,,I........................

UB2 PO1

,,,,.,..,,....,................I.,,,.......

PI 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..a.. LB1

PO0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . e

PI 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UBI

P26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . d

PI0

*..,,.*..*.......~.............*..*...‘..*

k P25

.,......*.....................*.*.*.......

J---L

PO7

..,,.........,*............................

P23 . . . . . ..I.... . . . . . . . . . 1.. . . . . . . . . . . . . . . . . . .

; a150”*lJ

PO5

. . . . . . . . . . . . . . . . . . . . . ..a...................

P22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a

PO4 . . . . . . . . . . . . . . . . . . . . . . . . . . ..a............. h

A-U-L-::Irl:“,”

PIN NO. / 41

Digit selection siqnal.

1 SIGNAL 1 PI5

I/O

1 OUT

The relationship between digit signal and digit are as follows:

Digit signal

Digit

PI 5 ..,.................................................... * . . . .

1 st.

PI2

2nd. . . . . . . ..*..........................................*.......

PO6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3rd.

PO3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4th.

*--e-H

p 1SOHz)

-* L

------ ---_______ GND

P27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5th.

P24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6th.

Normally, one pulse is output in every 13 period, and input to the grid of the Fluorescent Display.

PO6 n

PO3 n

P27 -

PIN NO. j 42

1 SIGNAL j PI4

I/O

/ OUT

Senment data signal. Kev strobe signal.

Signal similar to PI 6.

Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-l 2 line keys on key matrix is touched.

(RD939A3U)

PIN NO. / 43

1 SIGNAL /

PI3

I/O

1 OUT

Segment data signal.

Kev strobe signal.

Signal similar to PI 6.

_ 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.

(RD939A3U)

PIN NO. 44

SIGNAL 1 PI2

I/O

Dinit selection signal. Signal similar to P15.

1 OUT

(RD938A2U)

PIN NO. / 45

1 SIGNAL / PI1

I/O

j OUT

Swment data signal.

Kev strobe signal.

Signal similar to PI 6.

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.

(RD939A3U)

Page 27

PIN NO. 46

Segment data signal.

Signal similar to P16.

1 SIGNAL 1 PI0

I/O

j OUT

Kev strobe sional.

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.

(RD939A3U)

PIN NO. 47

Segment data signal.

Signal similar to P16.

1 SIGNAL / PO7

l/O

j OUT

Key strobe signal.

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.

(RD939A3U)

PIN NO. / 48

1 SIGNAL / PO6

Digit selection signal. Signal similar to PI 5.

I/O

/ OUT

(RD938A2U)

PIN NO. 1 49

1 SIGNAL 1 PO5

I/O

1 OUT

Segment data signal.

Key strobe signal.

Signal similar to PI 6.

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.

(RD939A3U)

PIN NO. / 50

1 SIGNAL / PO4

I/O

/ OUT

Segment data signal. Signal similar to P16.

(RD939A2U)

PIN NO. 1 51

1 SIGNAL j PO3

I/O

/ OUT

Digit selection signal. Signal similar to P15.

(RD938A2U)

PIN NO. 52

1 SIGNAL j PO2

I/O

1 OUT

Segment data signal.

Kev strobe signal.

Signal similar to PI 6.

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.

(RD939A3U)

PIN NO. 1 53

1 SIGNAL 1 PO1

l/O

1 OUT

Segment data signal.

Key strobe signal.

Signal similar to PI 6.

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.

(RD939A3U)

PIN NO. / 54

1 SIGNAL / PO0

I/O

/ OUT

Segment data signal. Signal similar to P16.

(RD939A2U)

PIN NO. / 55

1 SIGNAL j P27

I/O

1 OUT

Digit selection signal. Signal similar to PI 5.

(RD938A2U)

PIN NO. 1 56-57

1 SIGNAL / P26-P25

l/O

/ OUT

Segment data signal. Signal similar to PI 6.

(RD939A2U)

PIN NO. / 58

1 SIGNAL 1 P24

I/O

/ OUT

Digit selection signal. Signal similar to P15.

(RD938A2U)

PIN NO. / 59-60

1 SIGNAL 1 P23-P22

Segment data signal. Signal similar to PI 6.

I/O

1 OUT

(RD939A2U)

PIN NO. 1 61

Terminal not used.

1 SIGNAL / P21

I/O

1 OUT

PIN NO. 62 1 SIGNAL 1 P20

I/O

/ OUT

Input signal which communicates the door open/close information to LSI.

Door closed; “H” level signal( OV). / Door opened; “L” level signal(-5V). PIN NO. 1 63/64

Connected to GN D.

1 SIGNAL 1 AVCC/VSS

I/O

1 IN/IN

Page 28

SERWCING

I. 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.

2. Shapes of Electronic Components

E ”

Transistor OTD143EA

Transistor

DTAlAIES DTA114YS DTCl14ES DTB 143ES 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 AND PRESENTS A

HAZARD.

Therefore,

when checking the performance of

the touch

control panel,put the outer cabinet

on the oven to avoid touching the high voltage

transformer, or unplug the primary terminal

(connector) of the high voltage transformer to

turn it off; the end of such connector must be

insulated with an insulating tape. After servicing, be sure to replace the leads to their original locations.

A. On some models, the power supply cord be-

tween the touch control panel and the oven itself is so short that the two can’t be separated.

For those models, check and repair all the controls (sensor-related ones included} of the touch control panel while keeping it connected

to the oven.

B. On some models, the power supply cord be-

tween 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 opera-

tional state that is equivalent to the oven door

being closed.

As for the sensor-related controls of the touch

control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

(2) Servicing the touch control panel with

power supply from an external power

source:

Disconnect the touch control panel completely from the oven proper,and short both ends of the 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).

4. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 30W (It is recommended to use a soldering iron with a

grounding terminal.)

2) Oscilloscope: Single beam, frequency range:

DC - IOMHz type or more ad-

vanced model.

3) Others:

Hand tools

5. Other Precautions

I) Before turning on the power source of the

control unit, remove the aluminum foil applied for preventing static electricity.

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

3) After aluminum foil is removed, be careful that

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

4) Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5) Be sure to use specified components where high precision is required.

(RD94zAZU)

Page 29

R-9A53

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: To avoid possible exposure to microwave

energy;

A. Before operating the oven

1. Make sure that, when unlatching the door slowly, an accompanying “click” indicating the actuation of the monitor switch and latch switches is heard.

2. Check visually the door seal for arcing and damage.

B. Do not operate the oven before any of the follow-

ing conditions are repaired;

1. Door does not close firmly against the front of appliance.

2. There are a broken door hinge or-support.

3. The door is bent or warped.

4. There is any defective parts in the interlock, oven door or microwave generating and transmission assembly.

5. There is any other visible damage to the oven.

C. Do not operate the oven

1. Without the RF gasket.

2. If the door is not closed.

CAUTION: DISCONNECT OVEN FROM POWER

SUPPLY BEFORE

REMOVING

OUTER CASE. DISCHARGE HIGH

VO LTAG E CAPACITOR

BEFORE

TOUCHING ANY OVEN COMPO-

NENTS OR WIRING.

(RDAI 203U)

OUTER CASE CABINET REMOVAL

To remove the outer case and proceed as follows;

I. Disconnect oven from power supply.

2. Remove eight (8) screws from the rear and along the side edge of the case.

3. Remove the two (2) screws (LHSTIX LR-4) from

the lower portion of the oven cabinet back side.

4. Slide the entire case back about 3 cm to free it from retaining clip on the cavity face plate.

5. Lift the entire case from the unit.

CAUTION: DISCHARGE THE HIGH VOLTAGE

CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

Note:

The outer case cabinet is secured by special

(LH) screw. When securing or loosening the

screw,

LHSTIX (LR-4) type screw driver

should be used.

LH-SCREW (XOTSD40R 12RVO)

Removal of LHSTIX screw at oven back side

L&TIX SCREW DRIVER

LHSTIX SCREW

(SIZE LR-4)

LHSTIX screw driver and LHSTIX screw

Page 30

POWER TRANSFORMER REMOVAL

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

2. Discharge high voltage capacitor.

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

4. Disconnect high voltage lead of capacitor from the

transformer.

5. Disconnect wire leads from the transformer.

6. Remove two (2) screws and one (1) washer holding the transformer to the base cabinet.

Re-install

1. Rest the transformer on the base cabinet with its

primary terminals toward rear cabinet.

2. Insert the two edges of the transformer into two

metal tabs of the base cabinet.

3. Make sure the transformer is mounted correctly

to the corners underneath those tabs.

4. After re-installing the transformer, secure the transformer with two screws to the 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) and high voltage lead to the transformer and filament leads of transformer to the magnetron and capacitor, referring to the “Pictorial Diagram”.

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

NOTE; LIVE(ORANGE) WIRE MUST BE CON-

NECTED TO THE CABINET-SIDE OF

THE POWER TRANSFORMER.

ASYMMETRIC RECTIFIER AND H.V.RECTIFIER ASS’Y REMOVAL

1. Disconnect oven from power suppply and remove

CAUTION: WHEN REPLACING THE RECTIFIER

outer case.

ASSEMBLY, THE GROUND SIDE

2. Discharge the high voltage capacitor. TERMINAL MUST BE SECURED

3. Remove one (1) screw holding the H.V. rectifier FIRMLY WITH A GROUNDING terminal to the capacitor holder.

SCREW.

4. Disconnect the rectifier assembly from the capacitor.

HIGH VOLTAGE CAPACITOR REMOVAL

I. Disconnect oven from power supply and remove

outer case.

2. Discharge the high voltage capacitor.

3. Disconnect the high voltage wire leads and rectifier

assembly from high voltage capacitor and magnetron.

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

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

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

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

8. Remove the capacitor from the holder.

TURNTABLE MOTOR AND/OR COUPLING REMOVAL

! j 1. Disconnect the oven from power supply.

4. Remove the two (2) screws holding the turntable

2. Remove one (1) screw holding the turntable motor

motor to the mounting plate of the ‘oven cavity

cover to the base cabinet and take off the turntable

bottom.

motor cover.

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

3. Disconnect wire lead from the turntable motor.

6. Turntable coupling and turntable motor will be free.

Page 31

R-9A53

MAGNETRON REMOVAL

I, Disconnect oven from power supply and remove

outer case.

when removing the screws holding the magnetron

2. Discharge the high voltage capacitor. Disconnect

and air guide to prevent it from falling.

filament lead of transformer from magnetron.

6. Remove the magnetron from the unit with care so

Disconnect high voltage wire lead from magnetron.

the magnetron tube should not hit by any metal

3. Disconnect heater leads from the magnetron. Take

object around the tube.

off three (3) screws secured the chassis support to

CAUTION:

oven cavity and waveguide.

WHEN REPLACING THE MAGNETRON,

4. Remove cooling fan ass’y refer to “Cooling Fan

BE SURE THE R.F. GASKET IS IN

Removal” No.6 to 7.

PLACE AND THE

MAGNETRON

5. Carefully remove four (4) mounting screws hold the

MOUNTING SCREWS ARE TIGHTENED

magnetron and magnetron air guide to waveguide,

SECURELY.

COOLING FAN MOTOR WITH FAN THERMAL CUT-OUT REMOVAL

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

2. Discharge the high voltage capacitor.

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

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

. .

wave guide.

5. Release one (1) tab holding cooling fan duct to air guide.

6. Remove cooling duct and fan motor ass’y from unit.

The cooling fan motor assembly is now free.

7. Remove fan blade from fan motor shaft by pulling fan retainer clip.

8. Remove two (2) screws and nuts holding cooling fan motor and fan thermal cut-out . The cooling fan motor ass’y is now free.

CONVECTION MOTOR REMOVAL

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

2. Discharge the high voltage capacitor.

3. Disconnect wire leads from the convection motor.

Remove the convection fan belt and pulley(M).

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

cabinet.

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

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

7. Convection motor is now free.

DAMPER ASSEMBLY REMOVAL

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

2. Discharge the high voltage capacitor.

3. Remove cooling fan motor and magnetron refer to “Cooling Fan Motor Removal” and “Magnetrom Removal”.

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

5. Remove two(2) ovenside screws holding damper motor angle to thermal protection plate (right).

6. Damper assembly is free.

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

8. Damper motor and switch are free.

HEATER UNIT ASSEMBLY REMOVAL

(HEATING ELEMENT/THERMISTOR)

1. Disconnect oven from power supply and remove

6. The heater unit is now free.

outer case cabinet.

2. Discharge the high voltage capacitor.

3. Disconnect wire leads from oven thermal cut-out, convection motor, thermistor and heater element.

Remove convection motor ass’y refer to “Con-

vection Motor Removal No.3 to No.5”.

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

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

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.

3. Thermistor is free.

Page 32

R -9A53

OVEN LAMP SO

CKET REMOVAL

Own lamp sockot

I, Pull the wire leads from the oven lamp socket by

pushing the terminal hole of the oven lamp socket with the flat type small screw driver.

2. Lift up the tab of the oven lamp mounting plate holding the oven lamp socket.

3. Slide the oven lamp socket left-ward.

4. Now, the oven lamp socket is free. CAUTION: When replacing the oven lamp socket, re-

place it so that the side where the black dot is put faces left-ward.

Oven lamp socket

STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND

MONITOR SWITCH REMOVAL

1. Disconnect oven from power supply and remove

outer case.

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 procedure.

STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND

MONITOR SWITCH ADJUSTMENT

tf those switches do not operate properly due to a

mis-adjustment, the following adjustment should be

, LATCH

made.

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

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

moving it back and forth and then adjust the latch

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

HOOK

li’

Y-k4

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.

LATCH HEAD

LOWER

LATC;H

, UPPER

LATCH SWITCH

STOP SWITCH

MONITOR

SWITCH

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

Figure C-l. Latch Switches Adjustment

Page 33

R-9A53 a:,

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

To remove the control panel, proceed as follows:

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

2. Discharge the high voltage capacitor.

3. Disconnect connector CN-A, CN-E, CN-B, CN-F, TAB?, TAB2 and TAB3 from the control unit.

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

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

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

oven cavity flange.

7. Lift up and pull the control panel forward.

Replacement of individual component is as follows:

CONTROL UNIT AND KEY UNIT

I. 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 five (5) 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.

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.

@ LIFT UP

PUTTY KNIFE

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.

UPPER

1 1

LOWER

Figure C-2. Door Disassembly

Page 34

R-9A53

DOOR REPLACEMENT AND ADJUSTMENT

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.

7. 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

standards.

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 micro-

wave 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.

DOOR ADJUSTMENT

The door is adjusted by keeping the screws of each

hinge loose. The lower oven hinge can be loosened.

Page 35

R-9A53

MICROWAVE MEASUREMENT

After adjustment of door latch switches, monitor switch and door are 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 of the oven.

PREPARATION FOR TESTING:

Before beginning the actual test for leakage, proceed

as follows;

I. 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 per-

formance standard for microwave ovens must be

used for testing.

Recommended instruments are: NARDA 8100 NAR DA 8200 HOLADAY HI 1500

SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275+ 15ml of water initially at 20+5”C in the centre 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.

(RDBI 109U)

Microwave leakage measurement at 5 cm distance

Page 36

OVEN THERM0 CUT-OUT

150-c

UPPER LATCH SWITCH

NOTE: CONDITION

1. DOOR CLOSED

2. CLOCK APPEARS

ill 240V-50Hz

FM ?HERMo CUT- OUT 90’ c

DAMPER SWITCH

CONTROL UN I T

E-6 ’

-TAB I

1 1

CONVECTION MOTOR

TURNTABLE MOTOR

CONVECTION HEATER

b..bd

POWER TRANSFORMER

LOWER LATCH SWITCH

Figure O-l. Oven Schematic-OFF Condition

Figure O-2. Oven Sche

bmatic-High Cooking Condition

OVEN

THERM0 CUT-OUT

15o.c

MONITOR RESISTOR

MONITOR SWITCH

o.a/2ow

Note

uaA

UPPER LATCH SW I TCH

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING

CONTROL “HIGH”

4. START PAD TOUCHED

n OVEN LAMP w

FAN MOTOR h

----_

CONTROL UN1 T

E-S

-TAB I

QAMPER MOTOR

I 1

CONVECTION MOTOR

‘TTM

TURNTABLE MOTOR

CONVECTION HEATER

THERMCI CUT - OUl 90’ c

LOWER 1 ATCH SWITCH

H.V. RECTIFIER

MAGNETRON

Page 37

OVEN THERM0 CUT-OUT

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. CONVECTION PAD TOUCHED

3. DESIRED TEMP PAD TOUCHED

4 START PAD TOUCHED

15O’C

UPPER LATCH SWITCH

240V-50Hz

1EMP FUSE

150%

o.a/2ow

Note

FM THERM0 CUT-CJUl 90’ c

FAN MOTOR

----_

A-3

T ’

DAMPER MOTOR

CONVECTION MOTOR

TTd

TURNTABLE MOTOR

TRANSFORMER

H.V. RECTIFIER

MAQNETFI~N

LOWER LATCH SWITCH

OVEN THERM0 CUT-OUT 150’ c

UPPER LATCH SWJTCH

SCHEMATIC

NOTE:CONDITION OF OVEN

1 .DOOR CLOSED

2.MIX COOKING PAD TOUCHED

3.DESIRED TEMP TOUCHED

4.START PAD TOUCHED

MONITOR RESISTOR

MONITOR SWITCH

0. a/2ow

Note

‘I””

CONTROL UN IT

DAMPER MOTOR

TURNTABLE MOTOR

240V+oHz

BRN/l7

FUSE MBA

POWER

-----

H.V. RECTIFIER

MAQNETRON

3-J

FM THERI.#l CUT-OUT 90’ c

LOWER 1 ATCH SWITCH

Figure O-3. Oven Schematic-Convection Cooking Condition

Figure O-4 Oven Schematic-Automatic Mix Cooking Condition

% 0”

Page 38

;R-9A53

1 2

5 6 -

Page 39

Figure S-2. Control Panel Circuit

i ----. - .-* -... ._ . . - ---. ----.___YCI(-

AI .. -_iy---_--- - .I_ _.“_

- -

.--- -

i _ -__

Page 40

k-9A53

! i

, i I

! j

i I f

/ 1 i

I I

i I

)

I I

2 3

6 -

‘_

A .:

,,I:.

.._ .: :: :_.

,. .: ,:

,, .:::.: ,:.:::, ,y. ..:. :.:.::

.: :. _.L’

.,. :.. __‘_. ‘..:.“’

., ,..: .::.‘:~:::::.‘::.:‘.‘: ..x

. . .’ .:.

..:, :

‘C

Figure S-3. Printed Wiring Board

Page 41

* *

R -9A53

PARTS LIST

Note : The voltage supplied to the parts n*rr are greater than 250V.

REF. NO. 1 PART NO.

DESCRIPTION

1 Q’TY ICODE

ELECTRICAL PARTS

l- 1

FH-DZA005WREO High voltage rectifier ass'y

l- 2

FH-HZAOlOWREO Thermistor ass'y

11 ;

QACCAA020WREO Power supply cord QFS-CAOlOWREO Fuse (M8A)

t AE

ii;

l- 5 QFS-TA013WREO Temp. fuse 150°C

l- 6 QFSHDA002WREO Fuse holder

1 AE

l- 7 QSOCLAOllWREO Oven lamp socket

l- 8 QSW-MA009WREO Monitor switch (V-5220D-070)

l- 9 QSW-MA037WREO Stop switch (V-ll-3C25(RB))

2 AE

l-10 QSW-MA051WREO Upper & lower latch switches(V-5230D-600)

l-11

RC-QZA097WREO High voltage capacitor

l-12 RHET-A048WREO Convection heater

l-13 RLMPTA029WREO Oven lamp

l-14 RMOTDA043WREO Damper motor

l-15

RMOTDA097WREO Turntable motor

i,"

l-16 RMOTEAO17WREO Cooling fan motor

l-17 RMOTEA124WREO Convection motor

1 AV

l-18 RR-WZA003WREO Monitor resistor

O.Sn 2ow

l-19 RTHM-A024WREO Oven therm0 cut-out

l-20 RTHM-A035WREO Fan therm0 cut-out

1 AG

1-21

RTRN-A318WREO Power transformer

1 BP

1-22

RV-MZA074WREO Magnetron

CABINET PARTS

2- 1 FDAI-A095WRYO Base plate assembly

;I ;

FHNG-A092WRMO Oven hinge (lower)

1 AF

GCABDA037WRWO Rear cabinet

2- 4 GCABUA277WRPO Outer case cabinet

t BA

2- 5 GCOVHA156WRPO Turntable motor cover

1 AB

2- 6

GFTARAOOlWRWO Oven lamp access cover

2- 7 GLEGPA013WREO Foot

4' AB

2- 8

LANGK0243WRPO Capacitor holder

;11;

LBSHC0032WREO Cord bushing

LSTPP0008YBFO Cord anchorage (upper)

: AC

2-11 LSTPP0009YBFO Cord anchorage

(lower)

2-12 MLEVPA122WRFO Latch lever

2-13 PCUSGA023WRPO Cabinet cushion

i AA

2-14 PHOK-A043WRFO Latch hook

1 AM

CONTROL PANEL PARTS

;I :A

CPWBFA455WRKO Control unit (Not Replaceable Item)

QCNCMA244DREO 2-pin connector (A) -

331 g

QCNCMA230DREO 4-pin connector (B) QCNCMA267DREO 6-pin connector (E)

3- 1D QCNCWA030DREO 12-pin connector (G) 3- 1E

QLUGPA004DREO Tab terminal (TABl,TAB2,TAB3) 3- 1F RV-KXA012DREO Fluorescent display tube Cl,21

RC-KZA032DREO Capacitor

O.lpF 50V

VCEAB31VW477M Capacitor

470pF 35V

23,81

VCEAB31HW335M Capacitor

3.3vF 50V

VCEAB31CW476M Capacitor

47pF 16V

:6,7,2O,VCKYDllCY103N Capacitor

O.OlpF 16V

C60,61

28 RC-KZA031DREO Capacitor

O.lpF 25V

210

VCEAB31EW226M Capacitor

22i~F 25V

353

VCKYBllEX153N Capacitor

0.015pF 25V

370

VCKYF31HF103Z Capacitor

0.47pF 50V

380

VCEAB31HW474M Capacitor

0.47j~F 50V

JFl

RCRS-AOlODREO Ceramic filter (4.00MHz)

AB 1 AC 1

AC 1

AE 3 AA

AB 1

2 AA

1 AA 1 AA

1 AA

1 AA 1 AA 1 AD

Page 42

\R-9A53

\lote : The voltaae sumlied to the Darts n*n are greater than 250V.

REF. NO.

Dl-5 D7,70,

D80-88 D92-99

ICl

I . .

PART NO.

DESCRIPTION Q’TY

VHDlSR139-11B Diode (lSR139-100)

VHDlSS270A/-1 Diode (lSS270A)

Q20,40

Q84-8

Q80 Q81

Q82,83 R2 R3,60,

R70,80

R4 R5,20 R6 RlO R40,

R92-10 R61 R62 R63 R64

R81,86 R200 RY1,4-6 RY2 RY3

SP40 Tl VRSl ZD3 3- 2

3- 3 3- 4

;I ; 3- 7

3- 8 3- 9

4- 1 4- 2

;I ; 4- 5 4- 6

4- 7 21 ;

4-10

4-11 4-12 4-13 4-14 4-15

4-16 4-17 4-18 4-19 4-20

4-21 4-22 Q-23 4-24

RH-IZA388DREO LSi

VSDTA143ES/lB Transistor DTA143ES

RH-TZA063DREO Transistor 2SA933S VSDTC114ES/-3 Transistor DTC114ES VSDTD143EA/-4 Transistor DTD143EA

VSDTA114YS/-3 Transistor DTA114YS RH-TZA097DREO Transistor DTB143ES VRD-B12EF241J Resistor

24OQ 1/4W

VRD-B12EF102J Resistor

lkf2 1/4W

VRD-B12EF182J Resistor

1.8kf2 1/4W

VRD-B12EF153J Resistor

15kQ 1,'4W

VRD-B12HF112J Resistor

l.lkn 1/2W

VRD-B12HF360J Resistor

36n 1/2W

VRD-B12EF332J Resistor 3.3kR 1,'4W

VRD-B12EF273J Resistor

27kn 1/4W VRN-B12EK753F Resistor 75kR (F) 1/4W VRN-B12EKlOlF Resistor

lOOn (F) 1/4W

VRN-B12EK222F Resistor 2.2kR (F) 1,'4W VRD-B12EF680J Resistor

68f2 1/4w VRD-B12EF105J Resistor 1Mn 1/4W RRLY-A020DREO Relay (OJSH112LM) RRLY-AOGlDREO Relay (OMI-SH112D,WHITE) RRLY-A013DREO Relay (OMI-SH112D,BLUE)

RALM-A007DREO Buzzer (PKM22EPT) RTRNPA023DREO Transformer RH-VZAOlODREO Varistor (15G471K) RH-EZA105DREO Zener diode (RD4.3ESB2) FPNLCA910WRKO Control panel flame with key unit

JBTN-A606WRFO Open button MSPRDA009WREO Open button spring LANGTA197WRWO Control panel back plate MLEVFA042WRWO Open lever NSFTTA030WREO Open shaft

XEPSD30P12XSO Screw;control unit mtg. XCPSD40P12000 Screw;control panel back plate mtg.

OVEN PARTS

FBRGMA002WREO Bearing assembly FDUC-A126WRWO Steam duct assembly FFANJ0034WRKO Cooling fan assembly FFTA-A022WRKO Damper assembly FOVN-Al44WRYO Oven cavity

FROLPA045WRKO Roller stay LANGFA089WRW~0 Chassis support

. .

LANGQA136WRWO Convection motor mounting plate LANGQA213WRWO Lamp socket mounting angle LANGQA163WRPO Thermal cut-out mounting angle

LANGTA196WRWO Bearing mounting plate LBNDK0054WREO Heater element holder LFIX-A013WRWO Bearing holder plate LHLDK0005YBFO Cord holder MCAMPA030WRFO Damper cam

MHNG-A165WRMO Oven hinge (upper) NBLTKAOOSWREO Convection fan belt NCPL-A021WRFO Turntable coupling NFANMA019WRWO Convection fan NPLYBA025WRFO Pulley

NPLYBA025WRFO Pulley NSFTTA043WREO Damper shaft NTNT-A019WRHO Turntable tray PCOVPA157WREO Waveguide cover

___-

1 1 1

1 2 1 4

1 2 1 1

1 1 1 1

1 1

1 1 1 1 1

1 1

i: 1

1 2 1 1 1

1 1 1 1

1 1

COD

AV AB

AB AB

AC AB

AC AA AA

AA AA AA AA

AA AA

AA AH AK

AF AR AE AA AZ

AC AA

AK AC AB

AN AF

AP AE AE AE AB

AD AB

AB AB AC

AE AF AE AE AC

AC AA AT AD

Page 43

* *

Note:

The voltage supplied to the parts m*rr are greater than 250V.

REF. NO.

PART NO.

DESCRIPTION

4-26 PCUSGA211WRPO Transformer cushion D 4-27 4-28

PCUSUA146WRPO Magnetron duct cushion PCUSU0263WRPO Cushion

4-29 PCUSU0329WRPO Cushion

4-30

PCUSU0380WRPO Steam cushion C

4-31

PDUC-A267WRPO Heater duct

4-32

PDUC-A269WRWO Damper duct 4-33 PDUC-A270WRFO Cooling fan duct 4-34 PFPF-A138WREO Thermal protection sheet (left) 4-35 PREFHA028WRPO Thermal protection plate (left)

4-36 4-37

PFPF-A139WREO Thermal protection sheet (right)

PGLSPA181WREO Oven lamp screen 4-38

4-39

PREFHA027WRPO Thermal protection plate (right)

PSKR-AlSlWRWO Air guide (A)

4-40 .

PSKR-A152WRPO Air guide (B)

4-41 PSKR-A153WRPO Air guide (bottom) 4-42 PSKR-A156WRPO Air guide (C) 4-43 PSKR-AlGlWRWO Air guide (right) 4-44

PSKR-A171WRPO Magnetron air guide

4-45

PCUSGA221WRPO Cushion

4-46 PFPF-A064WREO Thermal protection sheet

DOOR PARTS

5 CDORFA523WRKO Door assembly, complete 5- 1

DDORFA262WRYO Door panel

2: 5

GCOVHA155WRFO Choke cover 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 5- 9 NSFTTA044WREO Latch shaft

5-10 PGLSPA333WREO Door glass

MISCELLANEOUS

6- 1 6- 2

;I ; 6- 5

66: ; ;r “9

6-10

6-11 6-12 6-13 6-14

7- 1 7- 2 7- 3

7- 4

7- 5

;I ;

;r ;

7-JO

FAMI-A059WRMO High rack

FAMI-A058WRMO Low rack TCADCA348WRRO Cook book TINSEA556WRRO Operation manual LBNDK0012YBEO Wire holder (WH-1 84mm >

FW-VZA810WREO Main wire harness QW-QZA099WREO High voltage wire A QW-QZAlOOWREO High voltage wire B FW-VZA591WREO Thermistor harness TLABSA018WRRO Fuse label

LHLDWQ004YBEO Wire holder (purse lock "L")

QTANP0020YBEO Connector CE-230

TCAUH0114WRRO Caution label

TSPCNB584WRRO Name plate

SCREW, NUTS, WASHERS AND PINS

LX-BZ0186WREO Screw;

oven lamp access cover mtg.

LX-BZ0202WREO Screw;

upper & lower latch heads mtg.

LX-CZA020WREO Screw;

oven hinges(upper & lower) mtg.

LX-CZ0017WREO Screw; heater element holders, thermister assembl!

air guide (A), (B) and (C) mtg.

LX-CZ0043WREO Screw;

thermal protection plate(left), bearing holder plate and

convection motor assembly mtg. LX-CZ0052WREO Screw; latch hook mtg. XOTSD40R12RVO Screw;

(LHSTIX LR-4) outer case cabinet mtg.

LX-NZ0029YBEO Nut;

steam duct assembly mtg. XBPSD30P14KOO Screw; damper switch mtg. XBPSD40P06KOO Screw;

convection motor assembly mtg.

Q’TY

R-9A53

CODE

AB AA AA AA AA

AN AK AL AK

AF AG AL AD AB

AB AF AD

AB AE

AP AP AY AG AA

AX AD AD AM AB

AA AA AC AE

AA AB AA

Page 44

I 1 R-9A53

hlnto . Thn wnltcma c~tnnlid tn tha nartr rr*n zero nwater than ?.!ifI\/

I.“Lti .

I ,I” ““ILuy” .z”~r.“‘“” C” Lll” p#“‘.”

US” J. VU.“. .I .I. I -VW . .

REF. NO.

PART NO.

DESCRIPTION Q’TY CODI

7-11

XBPSD40P25000 Screw;

cooling fan motor mtg. 2 AA

7-12 XFPSD40P30000 Screw; cord anchorages mtg.

2 AA

7-13 XBTUW40P06000 Screw;

waveguide cover mtg.heater unit assembly, 13 AA steam duct,over lamp mounting angle.

7-14

XBTWW40P06000 Screw; bearing mounting plate and

4 AA

convection heater mtg.

7-15

XCPSD30P06000 Screw; damper motor, oven therm0 cut-out 5

and fan therm0 cut-out mtg.

7-16

LX-WZA004WREO Washer; bearing mounting plate mtg.

1 AA

7-17

XCPSD30P08XOO Screw; door frame and door sash(left) mtg. 6 AA

7-18

XCPSD30P08000 Screw; door frame mtg. 3 AA

7-19

XCPSD40P08000 Screw; door sashtright),

7 AA thermal protection plate(right)., air guide(right) and damper assembly mtg.

7-20

XCTSD40P08000 Screw; steam duct mtg.

3 AA

7-21

XFPSD30P08000 Screw;

AH sensor assembly mtg. : R-9H52 only 2 AA

7-22

XFPSD40P08KOO Screw; oven lamp mounting angle, 4 AA

high voltage rectifier assembly, MG air guide(K) and thermistor harness grounding mtg.

7-23

XFPSD40P08000 Screw; turntable motor and magnetron mtg.

5 AA

7-24 XFPSDGOP14JSO Screw; power transformer mtg. AA 7-25

XNESD40-32000 Nut; cooling fan motor and : AA

upper & lower latch heads mtg.

7-26

XNEUW40-32000 Nut; convection fan mtg.

7-27

XOTSE40P12000 Screw;

outer case cabinet mtg. 4 AA

7-28 LX-CZ0047WREO Screw; base plate, T/C panel and 11 AA

chassis support mtg.

7-29

XOTSD40P12000 Screw; outer case cabinet, cord holder

and chassis support mtg.

7-30 XWSUW40-10000 Washer; convection fan mtg. 1 AA 7-31

XWWSD60-08000 Washer; power transformer mtg.

AA 7-32 XFPSD30PlOOOO Screw; fuse holder mtg. i AA 7-33

LX-WZA022WREO Washer; turntable motor mtg.

1 AA

7-34 XBPSD40P08KOO Screw; power supply cord grounding 1 AA 7-35 XFTSD40P08TVO Screw; high voltage rectifier assembly, 4

convection motor assembly, monitor

resister, turntable motor covering,

7-36

XOTSD40P08000 Screw; rear cabinet 4 AA

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER

2. REF. NO.

3. PART NO.

4. DESCRIPTION

(RDP1303U)

Page 45

R-9A53

Page 46

1 R-9A53

DOOR PARTS

i-2

CONTROL

MISCELLANEOUS

PANEL PARTS

(b4.V C)

(MG.)

IH v Cl

IH.V.Tl

xc Actual wre harness may be dliferent than lllustratlon

PACKING AND ACCESSORIES

s PACKING ADD KIT

(CPADElAOEL?WRKO)

%Not replaceble items

Page 47

fl-9A53

Page 48

--.-.-__

-- -____r-rs.r

_ _ m..I

----_.- “_

_~-__I____*-- - -r 1 . . _., -_

i ?Ts_yp_ -

_L ? : is

-0

1. 2 FL

-. ;

C 2 2

=: m