Sharp R-9H10 Service Manual

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R-9HlO

SHARP SERVICE MANUAL

S9808R9Hl OJ//

CONVECTION

MICROWAVE OVEN

In interests of user-safety the oven should be resto!ed to its original

condition and only parts identical to those specified should be used.

(RD161OlU)

TABLE OF CONTENTS

Page

FOREWORD

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

CAUTION, MICROWAVE RADIATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~.............................................

PRODUCT DESCRIPTION

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

GENERAL INFORMATION

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

OPERATING INSUTRACTIONS

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

OPERATION

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

SERVICING

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

TOUCH CONTROL PANEL ASSEMBLY

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDl

MICROWAVE MEASUREMENT PROCEDURE

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

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

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

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

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

............................................................ 22

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

............................................................ 37

PICTORIAL

DIAGRAM

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

CONTROL PANEL CIRCUIT

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

PRINTED WIRING BOARD

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

PARTS LIST

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

PACKING AND ACCESSORIES

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

SHARPCORPORATION

Page 2

R-9HlO

Page 3

R-9HlO

SERVICE MANUAL

SHARI=

CONVECTION MICROWAVE OVEN

R-9HlO

FOREWORD

This Manual has been prepared to provide Sharp Corp. Service

Personnel with complete Operation and Service Information for

the SHARP CONVECTION MICROWAVE oven, R-9HlO.

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

Check interlock switches and door seal carefully. Special attention should be given to avoid electrical shock and microwave radiation hazard.

(RD361 OZU)

CAUTION

MICROWAVE RADIATION

Personnel 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 waveguide or antenna while the device is energized.

Note (Parts List)

: The parts marked ‘I*” are used in voltage more than 250V.

(RD36202U)

SHARPCORPORATION

OSAKA, JAPAN

PRODUCT DESCRIPTION

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INSTRUCTIONS

: OPERATION

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1 SERVICING

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TOUCH CONTROL PANEL

: ASSEMBLY

1 COMPONET REPLACEMENT

AND ADJt’“,TMENT

MICROWAVE

‘I

1”

MEASUREMENT

WIRING DIAGRAM J

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PARTS LIST

(RD37201 U)

Page 4

R-9HlO

PRODUCT DESCRIPTION

SPECIFICATIONS

ITEM

Power Requirements

240 Volts 50 Hertz

DESCRIPTION

Power Consumption

Power Output

Convection Power Output

Case Dimensions

Single phase, 3 wire earthed 1500W (Microwave)

16OOW (Convection) 750 watts nominal of RF microwave energy (2 liter water load)

Operating frequency of 24501311 Hz 1500 Watts

Width 627mm

Height 378mm Depth 481 mm

Cooking Cavity Dimensions

Control Complement

Width 41 Omm

Height 245mm Depth 41 Omm

Touch Control System Clock( I:00 - 12:59 )

Set Weight

Timer (0 - 99 min. 99sec. ) Microwave Power for Variable Cooking

Repetition Rate;

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

Full power throughout the cooking time

MED HIGH

. . . . . . . . . . . . . . ..I.....*....................*...

approx. 70% of Full Power

MED

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

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)

Variable cooking control pads, AUTO START/CLOCK pad

EASY DEFROST pad, ONE TOUCH REHEAT pad, SENSOR COOK pad COMPU COOK pad, STOP/CLEAR pad, MEMORY pad INSTANT COOK/START pad

Approx. 30.0 kg

QOTE:

Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.

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R-9H10

GENERAL INFORMATION

WARNING-THIS APPLIANCE MUST BE EARTHED

IMPORTANT

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 f

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.

(RD51108u

OPERATING INSTRUCTIONS

ONE TOUCH REHEAT PAD

Touch to set clock or auto start

VARIABLE COOKING CONTROL PADS

Touch to select microwave power setting. HIGH is automatically selected if a power pad is not touched.

twice to cancel cooking programme.

-M-ORE(A), LESS(v) PADS Touch to increase/decrease the time in one minute increments

multiples each time this pad is touched during cooking. Touch to start oven after setting programmes.

Page 6

R-9HlO

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

(RD71101 U)

Relay and Components Connection

RELAY CONNECTED COMPONENTS

--. RY-1 oven lamp/turntable motor

-RY-2

power transformer

RY-3

convection heater RY-4 damper 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 supplied 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 I:00 will appear and count up every minute.

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

A si”,“,el 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.

(RD71207U)

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 (RY?, RY2,

RY6).

(For details, refer to Figure O-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

feed-box, and then into the cavity where the food is placed to be cooked. 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. 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. The monitor switch is electrically monitoring the operation of the upper latch switch and is mechanically associated with the door so that it will function in the following sequence.

(1)

When the door opens from a closed position, the 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 position, 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 follows:

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.

(aoarox. 10% Dower1

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.

(RD71401 U)

Page 7

R-9HlO

CONVECTION COOKING CONDITION

5. At the end of the convection cook cycle, shut-off

PREHEATING CONDITION

relay (RY4) is energized turning on the damper

Program desired convection temperature by touching

meotor. The damper is returned to the open position,

the CONVECTION pad and the temp. pad.

closing the damper switch contacts which send a

When the START pad is touched, the following oper-

signal to the control unit, de-energizing shut-off

ations occur:

relay (RY4).

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

y:e 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.

The coil of heater relay (RY3) is energized by the CPU unit and the main supply voltage is added to the convection heater. When the oven temperature reaches the selected preheat temperature, the following operations occur: 4-1. The heater relay (RY3) is de-energized by

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

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

minutes, turning the convection heater on and off, as needed to maintain the selected preheat temperature. The oven will shut-down completely after 15 minutes.

CONVECTION COOKING CONDITION

When the preheat temperature is reached, a beep signal will sound indicating that the holding temperature has

been reached in the oven cavity. Open the door and place the food to be cooked in the oven.

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

The numbers of the digital readout start the count down to zero. The oven lamp, turntable motor, cooling fan motor and convection motor are energized.

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

Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 90 ‘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 aNow the damper door to open.

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:

The numbers of the digital readout start the count down to zero. The shut-off relay (RYI, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The shut-off relay (RY4) is energized. The damper door is closed from the open position. The heater relay (RY3) is energized, adding the mains supply voltage to the convection heater. Now, the oven is in the convection cooking condition. 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.

(MICRO.1 OFF

I I

‘ON

I I

OFF

LOWMIX’

BAKE

MICROWAVE POWER

- Approx. 10%

CONVECTION TEMPERATURE

- lao°C

- Approx. 30%

CONVECTlOU

TEMPERATURE

ICONVECJ

- 2oo”c

32 sac.

HIGH MIX

-ROAST

Page 8

R-9HlO

Note: During alternate Microwave/Convection opera-

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

SENSOR COOKING CONDITION

Using the SENSOR COOK function, the foods are cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and inputted into

the LSI. An example of how sensor works:

Potatoes at

room temperature.

Vapor is em

itted very slowly.

Heat potatoes. Moisture and humidi

ty is emitted

rapidly You can .sr?ll the aroma as it cooks.

2. Select desired Sensor setting.

Touch START pad.

The coil of shut-off relays( RYI ,RY6) are energized, the oven lamp and cooling fan motor are turned on, but the power transformer is not turned on. After about 16 seconds, the cook relay (RY2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor. NOTE: During this first stage, do not open the door

or touch STOP/CLEAR pad.

When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir food, turn it or season, etc. When the timer reaches zero, an audible signal sounds.

The shut-off relay and cook relay are de-energized and the power transformer, oven lamp, etc. are turned off. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

COMPU COOK

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

Enter the weight by touching the Number pads When the START pad is touched, the following operations occur:

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.

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

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

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

Cooking Sequence.

1. Touch SENSOR COOK pad. NOTE:The oven should not be operated on SEN-

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

At the end of the COMPU 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

240V-50Hz

TEMP.

FUSE

l45’C

7EMP. FUSE

145’C

OVEN THERM0 CUT-OUT

150-c

OVEN THERM0 CUT-OU’

15O’C

UPPER LATCH SWITCH

MONITOR RESISTOR

MONITOR SWITCH

O.S/2OW

“Y”

MONITOR RESISTOR

MONITOR SWITCH

THERM0 CUT- OUl 90’ c

LOWER LATCH

SWITCH

I.AC CORD CONNECTION

BRN :

BROWN BLU : BLUE G-Y : GREEN AND

YELLOW STRIPE

/I7 : SECT I ONAL AREA

OF I .Omm’ MIN.

2.ORANGE WIRE (LIVE) MUST BE CONNECTED

TO THE CABINET-SIDE TERMINAL OF POWER TRANSFORMER.

FM 1HERMC CUT- cJu1 90’ c

LOWER L ATCH

SWITCH

“L

A FAN MOTOR 7

_-_--

A-3

-----

A-3

UPPER LATCH SWITCH

CONTROL UN IT

SENSOR COOKING

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. “SENSOR COOK” PAD TOUCHED

3. “START” PAD TOUCHED

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS

HIGH COOKING

DAMPER MOTOR

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL “HIGH”

4. START PAD TOUCHED

-CONVECTION MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

CONVECTION HEATER

POWER TRANSFORMER

H.V. RECTIFIER

MAGNETRON

H.V. RECTIFIER

MAGNETRON

Figure O-2. Oven Schematic-High and Sensor Cooking Condition

Figure O-l. Oven Schematic-OFF Condition

Page 10

SCHEMATIC

NOTE: CONDITION

OF OVEN

1. DOOR CLOSED

2. CONVECTION PAD TOUCHED

3. DESIRED TEMP. PAD TOUCHED

4. START PAD TOUCHED

OVEN THERM0 CUT-OUl 150-c

UPPER LATCH SWITCH

Figure O-3. Oven

Schematic-Convection Cooking Condit

#ion

Figure O-4 Oven Schematic-Automatic Mix Cooking Cordition

240V-50Hz

MONITOR RESISTOR MONITOR SWITCH o.l3/2ow

OVEN LAMP

DAMPER MOTOR

-CONVECTION MOTOR

TURNTABLE MOTOR

FM lHERM0 CUT-OUl 90’ c

LOWER LATCH SWITCH

$3, ~~:~~FORMEA

OVEN THERM0 CUT-OUT

I50 c

4-h

240V-5OHz

UPPER LATCH SWITCH

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

o.a/2ow

[..,

c E-4

RY5 ;

DAMPER SWITCH

E-5

CONTROL UN IT

-DAMPER MOTOR

~-CONVECTION MOTOR

1EhkP. FUSE

145’C

FM ltiERM0 CUT-OUT 90’ c

LOWER LATCH SW I TCH

CONVECTION HEATER

H.V. RECTIFIER

MAGNETRON

Page 11

R-9HlO

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 fail-

ure, obstructed air ducts, dirty or blocked air intake, etc.

Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the heater unit, the oven thermal cut-out will open, causing the oven to shut down. When the oven has cooled temperature, the oven thermal cut-out closes.

(RD72407U’)

MO’NITOR 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:

I. 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.

(RD72EOl U’)

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

LATCH HEAD

UPPER LATCH SWITCH

STOP SWITCH

MONITOR FUSE

MONITOR SWITCH

LOWER LATCH SWITCH

SWITCH LEVER

OPEN LEVER

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.

Page 12

R-9HlO

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 ihe oven

cavity drops below the selected temperature, the con-

vection heater is energized again. In this way, the in-

side 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 90 “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 OC., at which time the relay will be de-en !rgized, turning off the fan motor. Relay RY5 will howe? er, open as soon as the convection cycle has ended, turning off the convection fan motor.This will now cool and allow t!, damper door to open.

(RD72NOl U’)

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except

during convection cooking.

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

Microwave Cooking:

Damper is in the open position, because a portion of

cooling air is channeled through the cavity to remove steam and vapors given off from the heating foods.

It is then exhausted at the top of the oven cavity into

a condensation compartment.

Convection Cooking:

Damper is in the closed position, so that no hot air will be allowed to leak out the oven cavity.

Damper Operation

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

1-2

1-3

1-4

1-5.

nal is sensed in the control unit, and operates shut’-off relay (RY4). Contacts of shut-off relay (RY4) close, the damper motor is energized, opening the damper door.

When the damper is moved to the open posi-

tion by the damper cam, damper switch is closed (ON position). The signal of damper switch is re-sensed in the control unit and shut-off relay (RY4) is turned off. 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.

3-2.

3-3.

3-4

NOTE:

Damper motor is energized by touching the convection, temperature and START pads. When damper is in the closed position

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

The damper is held in the closed position during the convection cooking operation. At the end of the convection cooking, shut-off relay (RY4) is energized, and the damper is

returned to the open position. If the damper door is not in the proper position, closed durin convection or open durning microwave, the control unit will stop oven operation after 1 minute.

Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Sensor cooking OPEN

Automatic mix cooking

Grill cooking CLOSE

Slow cookina CLOSE

(RD72002U)

DAMPER SHAFT

DAMPER DUCT

DAMPER CAM

DAMPER SWITCH

DAMPER MOTOR

Figure D-l. Damper Mechanism

Page 13

R-9HlO

SERVICING

TROUBLESHOOTING GUIDE

When troubleshooting the microwave oven, it is

helpfull to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure”section.

IMPORTANT: If the oven becomes inoperative be-

cause of a blown fuse in the monitor

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.

(RD81102U’)

Page 14

R-9HlO

OFF CONDTION

COOKING

CONDTION

IYE-)

CONVECTION

(SENSOR)

Problem

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 does not light with door opened. Oven lamp does not light in cook cycle.

(Does light when door is opened)

Oven lamp does not light at all.

Oven lamp lights, but turntable motor does not

operate.

Cooling fan motor does not operate

Oven does not go into a cook cycle when START

pad is touched.

Oven seems to be operating but little or no heat is

produced in oven load.(Food incompletely cooked or not cooked at all at end of cook cycle.)

Oven goes into a cook cycle but extremely uneven

heating is produced in 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.

Temperature in the oven cavity is lower or higher

Convention cycle runs 1 minute then shuts down.

Convection cycle runs 3 minutes then shuts down.

Oven is in the sensor cooking condition but AH

sensor dbes not end stage 1 or does not stop

cooking cvcle or the oven stops soon.

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Page 16

R-9HlO

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

MAGNETRON ASSEMBLY TEST

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

To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.

To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.

This test should indicate an infinite resistance. If there is little or no

resistance, the magnetron is grounded and must be replaced.

Power output of the magnetron can be measured by performing a water temperature rise test. This test should only be used if above rests do not indicate a faulty magnetron and there is no defect in the following components or wiring:

high voltage rectifier, rectifier, high voltage

capacitor, and power transformer.

MICROWAVE OUTPUT POWER

Microwave output power from the magnetron can be measured by way of substitution, 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/4.2 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=Vx AT P (W) = 4.2 x V x AT/t

Our condition for the water load is as follows:

Water load . . .

2000 ml, Heating time . ..I 12 seconds

P = 75 x AT

Measuring method;

1. Put the water load of two (2) litres on the center of the oven shelf. The water load should

be arranged in two (2) Pyrex beakers, the size of which is one (1) litre, and be placed at right and left, side by side, on the oven shelf.

2. Measure the temperature of water before heating and also after heating during 112 seconds

by microwave, and calculate the temperature rise. The temperature rise should be the average of temperature differences measured in each beaker.

3. The output power should be calculated as follows. In case the measuring result is not satis-

factory, execute the measurement several times and judge the result from the synthetic point of view. Microwave output power should be within + 15% of the nominal one.

Calculation of output power; Microwave output power

. ..P(W)=75x AT(C)

AT = ( ATL + ATR) / 2 : average temperature rise

ATL = (TL2 - TLI), ATR = (TR2 - TRI) TL2 : water temperature after heating in left beaker TLI : water temperature before heating in left beaker TR2 : water temperature after heating in right beaker TRI : water temperature before heating in right beaker

Measuring condition; As the microwave output is affected by several conditions, the measurement should be made carefully with following attentions. I. Initial temperature of salt water should be IO f 1 “C. Well and quickly stir the water and the

temperature measurement should be done immediately after heating.

2. The graduation of thermometer should be scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended.

3. Water container should be one (1) litre beaker made of Pyrex glass and its diameter approximately 12 cm.

Page 17

R-9HlO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

4. Room temperature should be around 20 “C.

5. Power supply voltage should be specification voltage.

(RD82304U’)

POWER TRANSFORMER TEST

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

Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil sho.uId 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 MEASlJRE THE FILAMENT AND HIGH VOLTAGE.)

(RD82401 U’)

C HIGH VOLTAGE RECTIFIER AND RECTIFIER TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS 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 RECTIFIER 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.

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 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 IOM 0 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 the terminals. If it is shorted, replace the capacitor.

tRD82603U)

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

(COM)

Common Terminal-Normally Close Terminal

(NO)

Operation

(COM) (NC)

Plunger released Plunger pushed

Open circuit Closed circuit

Close circuit Open circuit

C RD82701 U)

Page 18

q-9HlO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

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.

SWITCH

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 according 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. FiiSE 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 indi-

cates 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.

(RD82G05U’)

Page 19

R-9HlO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

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 OOM n insulation

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

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. 300 fI - 192 n

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

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

R-9HlO

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 two units, Control Unit and Key Unit and troubleshooting by unit replacement is de-

scribed according to the symptoms indicated.

1. Key Unit. The following symptoms indicate a defective key unit. Replace the key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.

2. Control Unit The following symptoms indicate a defective control unit. Replace the control unit. 2-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 ficker. 2-3 Other possible troubies caused by delx. je control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. d) Proper temperature measurement is not obtained.

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

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

(RD82SOl U)

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

Oven lamp and Turntable motor

RY2 (COOK)

Approx. 13 V.D.C

Power transformer

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

Heating element

RY4

Approx. 14 V. D.C.

Damper motor

RY5

Approx. 14 V.D.C.

Convection motor

RY6

Approx. 13 V.D.C

Cooling fan motor

(RD82ROW)

Page 21

R-SHIO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER COMPONENT TEST

P 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 light up.

STEPS OCCURANCE CAUSE OR CORRECTION

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

of CPU connector (CN-A)

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

transformer. Check and reuair.

3 Only pattern at “a” is broken. ‘Insert jumper wire 1 and solder.

Pattern at “a” and “b” are broken. ‘insert the coil RCILF2003YAZZ between “c” and

I’d”.

NOTE:’ At the time of these repairs, make 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.

Page 22

?-9HlO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

AH SENSOR

Checking the initial sensor cooking condition

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

should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION Instructions”.

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

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

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

any moisture with a dry cloth or paper towel.

(6) The Sensor works with food at normal storage temperature. For example, chicken pieces

would be at refrigerator temperature and canned soup at room temperature.

(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings.

The sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

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

and the oven will shut off.

Water load cooking test

Make sure the oven has been plugged in at least five minutes before checking sensor cook operation. The cabinet should be installed and screws tightened.

(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) Touch SENSOR COOK pad and number pad 2. Now, the oven is in the sensor cooking

condition and SC-2i indicator will appear in the display.

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

wave energy.

When the AH sensor is defective (open or short), ERROR will appear in the display after 16 seconds cleaning time.

If ERROR appears check sensor wire connections and/or AH sensor.

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

stage of sensor cooking.

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

water is boiling (bubbling).

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

-s

TESTING METHOD FOR AH SENSOR AND’/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.

(1) Disconnect oven from power supply and remove outer case. (2) Discharge the high voltage capacitor. (3) Remove the AH sensor. (4) Install the new AH sensor.

(5) Re-install the outer case.

Page 23

R-9HlO

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

(6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as

follows: 6-l. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring

cup.

6-2. Place the container on the center of tray in the oven cavity. 6-3. Close the door. 6-4. Touch SENSOR COOK pad and number 2 pad. 6-5. Touch Start pad. The control panel is in automatic Sensor operation. 6-6. The oven will turn off automatically when the water is boiling (bubling).

If new sensor does not operate properly, the problem is in the control unit.

CHECKING CONTROL UNIT

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

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

follows: 6-1. Touch SENSOR COOK pad and number 2 pad. 6-2. Touch Start pad. The control panel is in the sensor cooking operation. 6-3. After approximately 20 seconds, push plunger of select switch. This condition is same as judgement by AH sensor. 6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will

sound, and the display will then revert to the time of day

If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.

Plynger

NO To Connector (F) on Control Unit

/( CoM

CONNECTOR

F- I F-2 F-3

ccd#--) I 4-3 2 +jq---- 3

&ii=

* ;

IL?- -

NCI

RI. R2 : lOOa + 1% 1/2w

R3 : IOkn 5% I/4W R4: 3kn:5% 1/4W

Figure A. Sensor Dummy Resistor Circuit

Page 24

OUTLINE OF TOUCH CONTROL PANEL

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

(1) Key unit (2) Control unit

The principal functions of these units and the signals commu-

nicated 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 Pl , P02, P05, P07, P10,

Pl 1 and P13. 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 (IZA197DR), power source circuit,

synchronizing signal circuit, ACL circuit, buzzer

circuit, temperature measurement circuit, absolute humidity

sensor circuit and indicator circuit.

1) LSI

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

2) Power Source Circuit This circuit generates the voltages necessary for the control unit from the AC line voltage.

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

commercial frequency.

4) ACL Circuit

A circuit to generate signals resetting the LSl 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 [ 1 ] : Oven The temperature in the oven cavity is sensed by the ther-

mistor. The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI. The LSI uses this information to control the relay and dis-

play units.

7) Absolute Humidity Sensor Circuit

This circuit detects the humidity of the food which is be-

ing cooked, to control its automatic cooking.

8) Stor Switch A switch to “tell” the LSI if the door is open or closed.

9) Relay Circuit To drive the megnetron, heating element, fan motor, convection motor, damper motor and light the oven lamp.

10) Indicator Circuit Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is triode having a cathode,

a grid and an anode.

Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display has 6-digits, 15-segments are used for displaying figures.

Page 25

R-9HlO

DESCRIPTION OF LSI

7e LSI (IZAl97DR) is detailed in the following table.

LSI (IZA197DR)

The I/O signals of 1

Signal

I/O

Description

Pin No.

VREF IN Reference voltage input terminal.

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

2 IN7 IN

Terminal to change functions according to the model.

Signal in accordance with the model in operation is applied to set up its function.

3 IN6 IN

Terminal for manufacture test.

Terminal not used. Connected to VC.

IN5

IN4

5 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)

Terminal not used.

6 IN3

IN2 IN Temperature measurement input: OVEN THERMISTOR.

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

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

IN1 IN

AH sensor input

This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.

IN0

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

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

A/D converter built into the LSI.

P47

OUT

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

P46 OUT

P45

OUT

13 P44

P43 OUT

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

“H” level (GND) : Temperature measurement timing. (Convection cooking)

“L” level (-5V) : Thermistor OPEN timing.

Page 26

Pin No.

Signal

R-9HlO

P4 1

P40

P37

P36

P35

P34

I/O

OUT

Terminal not used.

Description

Cooling fan motor driving signal.

To turn on and off shut-off relay (RY6).

“L” level during both microwave and con-

vection cooking;

“H” level otherwise.

H GND

DUflng

OFF

cookmg

-----L

CONVECTION MOTOR driving signal.

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

Terminal not used.

Heating element driving signal.

To turn on and off the heater relay (RY3).

“L” level during convection cooking; “H” level otherwise. During convection cooking, the signal becomes

“H” level when the temperature of the

oven cavity exceeds the predetermined temperature.

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

To turn on and off shut-off relay (RY 1).

The Square waveform voltage is delivered to the RYl driving circuit and relays (RY2, RY3, RY5) control circuit.

Durmg cooktng

c-r- -- H

-i-

-L

20 tnsec.

Page 27

R-9HlO

Pin No.

Signal

I/O

Description

P33

P32

OUT

Magnetron high-voltage circuit driving signal.

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

In High operation, the signals holds “L” level during microwave cooking and “H” level while not cooking. In other cooking modes (MED HIGH, MED, MED LOW, LOW) the signal turns to “H” level and “L” level in repetition according to the power level.

HIGH

MED H,G;’ 24s.~

MED

I-

MED ,,,i:,2:;$iq

LOW BFIL GND

I-

-l

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 pre-

heating mode, or when the preheating hold time (15 minutes) is elapsed.

0.12 BBC.

-!-

2.4 sec.

1.2 H CND

24 P31

Signal to synchronize LSI with commercial power source frequency.

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

P30

OUT Damper motor relay driving signal.

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

H GNO

OFF

.------L

26 CNVSS

Connected to VC.

RESET IN Auto-clear terminal.

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

Page 28

R-9HlO

Signal I/O

Description

XIN IN

Internal clock oscillation frequency setting input.

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

respect to XOUT terminal.

XOUT OUT

Internal clock oscillation frequency control output. Output to control oscillation input of XIN.

XCIN

Terminal not used.

XCOUT

OUT

vss

IN Power source voltage: -5V.

VC voltage of power source circuit input.

OUT

Terminal not used.

Signal coming from touch-key.

When any one of G-l line keys on key matrix is touched, a corresponding signal from POl, POZ, P05, P07, Pl 0, Pl 1 or P13 will be input into R3.

When no key is touched, the signal is held at “L” level.

IN Signal similar to R3.

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

Rl IN

Signal similar to R3.

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

be input into Rl.

37 RO

IN Signal similar to R3.

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

Anode (segment) of Fluorescent Display light-up voltage: -28V VP voltage of power source circuit input.

P17 OUT Terminal not used.

P16

OUT Segment data signals.

The relation between signals and indicators are as follows:

Signal Segment

Signal

Segment

Pl6.

................ .LR2

PO2.

................. g

P14.

................ .Ul32

PO1

.................. f

P13.

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

.LBl

POO.

................. e

Pll..

............... .lJBl P26.

................. d

PlO.. ................

P25.

................. c

P07.

................. j P23.

................. b

P05.

................. i P22.

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

P04.. ................

(50Hzl

-J-u-r::;

Page 29

R-9HlO

Pin No,

Signal

P15

P14

P13

P12

Pll

PlO

PO7

PO6

I/O

OUT

Description

Digit selection signal. The relationship between digit signal and digit are as follows;

Digit signal

digit

P15 . . . . . . . . . . ..*............. 1st

---- ---- --__ ----C&JO

P12 . . . . . . . . . . ..I.............

2nd

PO6

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

3rd

PO3

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

4th

P27

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

5th

PO6 n

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

PO3 n

Normally, one pulse is output in every I3 period, and input to the grid of the

P27 n .

Fluorescent Display.

P24 d

1) Segment data signal. Signal similar to P16.

2) Key strobe signal. 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.

Digit selection signal. Signal similar to P15.

1) Segment data signal.

Signal similar to P16.

2) Key strobe signal. 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.

1) Segment data signal. Signal similar to P16.

2) Key strobe signal. 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.

1) Segment data signal. Signal similar to P16.

2) 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.

Digit selection signal. Signal similar to Pl5.

Page 30

R-9HlO

Pin No. Signal

I/O

PO5

OUT

PO4 OUT

PO3

OUT

PO2 OUT

53 PO1 OUT

54 PO0

55 P27

P26

P25

P24

OUT

P23

P22

OUT Segment data signal.

~ Signal similar to P16.

OUT

P21

P20

AVCC

vss

OUT

Description

1) Segment data signal. Signal similar to P16.

2) Key strobe signal. 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.

1) Segment data signal. Signal similar to P16.

Digit selection signal. Signal similar to P15.

1) Segment data signal. Signal similar to P16.

2) Key strobe signal. 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.

1) Segment data signal.

Signal similar to P16.

2) Key strobe signal.

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.

1) Segment data signal.

Signal similar to P16.

Digit selection signal.

Signal similar to P15.

1) Segment data signal. Signal similar to P16.

Digit selection signal. Signal similar to P15.

Terminal not used.

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

“H” level signal (OV)

Door opened;

“L” level signal (-- 5V)

Connected to GND.

Page 31

ABSOLUTE HUMIDITY SENSOR CIRCUIT

(1) Structure of Absolute Humidity Sensor

The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another is in an open vessel. Each sensor is provided with the protective cover made of metal mesh to protect it from the external airflow.

Sensing part Sensing part (Open vessel 1 (Closed vessel 1

(2) Operational Principle of Absolute Humidity

Sensor

The figure below shows the basic structure of an

absolute humidity sensor.

A bridge circuit is

formed by two thermistors and two resistors (RI

and R2).

The output of the bridge circuit is amplified by the

operational amplifier. Each thermistor is supplied with a current to keep

*it heated at about 150 “C (302 OF), the resultant

heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it is amplified by the operational amplifier.

Operational amplifier C

is”i!l

8 *u

s: : RI

%a”,“e’

P-

S: Thermistor

open vessel

R3 u

C: Thermistor

closed vow

Absolute humidity vs. output voltage characteristis

Absolute humidity (g/m’ 1

(3)Detector Circuit of Absolute Humidity Sen-

sor Circuit

This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the

LSI to control the sensor cooking of the unit. When the unit is set in the sensor cooking mode, a 16 second clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its IN1 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R50-1. Changing the resistance values results in that there is the same potential at both the F-3 terminal of the absolute humidity sensor and IN0 terminal of the

LSI. The voltage of IN1 terminal will indicate about

-2.5V. This initial balancing is set up about 16

seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to generate moisture by which the resistance balance’of the bridge circuit is deviated to increase the voltage available at IN1 terminal of the LSI. Then the LSI observes that voltage at IN1 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit goes in the next operation automatically. When the LSI starts to detect the initial voltage at

IN1 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance, of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will anpear on the display and the cooking is stopFed. ’

( D72QOlU)

1 )Absolute humidity sensor circuit

Thermamtar In closed v.sseI

Tharmfslor In op.” P.S..,

R50 Rdatof block

SW4 1

P441

sw59.

P43 ---01

-1

IN0

LSI

( IC 11

IN1

VA:‘-1 5V

2)lnternal equivalent circuit of I2

CH1

CH2

Top View

Page 32

R-9HlO

SERVICING

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.

When storing and transporting, thoroughly wrap them in aluminum foil. Also wrap all PW boards containing them in aluminium foil. When soldering, ground the technician as shown in the figure

and use grounded

soldering iron and work table.

approx. 1 MR

2. Shapes of Electronic Components

Transcstor 2SB793

Tramstor DTD143EA

TransMor DTA143ES DTAl14YS DTBl43ES DTCll4ES 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 PRESENT 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 shall 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.

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

Other Precautions

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

B. On some models, the power supply cord 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 operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

(2) Servicing the touch control panel with

power supply from an external power source:

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

the 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).

Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity. Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

After aluminum foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

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

Be sure to use specified components where

high precision is required.

(RD94ZE2U)

Page 33

R-9HlO

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: To avoid possible exposure to microwave

energy;

A. Before operating the oven

1. Make sure that unlatching the door slowly is accompanied by a click indicating actuation of the monitor switch and latch switches.

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 is 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.

(RDA1203U)

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.

LHiTIX SCREW DRIVER

LHSTIX SCREW

(SIZE LR-4)

LHSTIX SCREW DRIVER AND LHSTIX SCREW

p-00

c=-===r

ml*

REMOVAL OF LHTIXS.S;;EW AT OVEN BACK

Page 34

R-9HlO

POWER TRANSFORMER REMOVAL

I. 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 hold-

ing 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 (1) screw holding the capacitor holder to the rear cabinet.

8. Remove the capacitor from the holder.

TURNTABLE MOTOR AND/OR COUPLING REMOVAL

1. Disconnect the oven from power supply.

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

3. Disconnect wire lead from the turntable motor.

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

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

6. Turntable coupling and turntable motor will be free.

Page 35

R-9HlO

MAGNETRON REMOVAL

Disconnect oven from power supply and remove

when removing the screws holding the magnetron

outer case.

Discharge the high voltage capacitor. Disconnect

filament lead of transformer from magnetron.

Disconnect high voltage wire lead from magnetron. Disconnect heater leads from the magnetron. Take off three (3) screws secured the chassis support to oven cavitv-and waveauide. Remove cooling fan “ass’y refer to “Cooling Fan

Removal” No.6 to 7.

and air guide to prevent it from falling.

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

CAUTION:

WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE

AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

Carefully remove four (4) mounting screws hold the magnetron and magnetron air guide to waveguide,

COOLING FAN MOTOR WITH FAN THERMAL CUT-OUT REMOVAL

Disconnect oven from power supply and remove

outer case.

Discharge the high voltage capacitor. Disconnect wire leads from the cooling fan motor

‘and fan thermal cut-out.

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

’

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

guide.

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

The cooling fan motor assembly is now free.

Remove fan blade from fan motor shaft by pulling

fan retainer clip.

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

Disconnect oven from power supply and remove

outer case.

Discharge the high voltage capacitor. Disconnect wire leads from the convection motor. Remove the convection fan belt and pulley(M).

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

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

Remove two (2) screws and nuts holding the motor to mounting angle. Convection motor is now free.

DAMPER ASSEMBLY REMOVAL

Disconnect oven from power supply and remove outer case. Discharge the high voltage capacitor. Remove cooling fan motor and magnetron refer to “Cooling Fan Motor Removal” and “Magnetrom Removal”. 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 (1) screw holding damper switch to damper motor angle.

8. Damper motor and switch are free.

HEATER UNIT ASSEMBLY REMOVAL

(HEATING ELEMENT/THERMISTOR)

Disconnect oven from power supply and remove

outer case cabinet. Discharge the high voltage capacitor. 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”.

Remove eleven (I 1) screws holding heater duct to

the oven cavity.

Release two (2) snap bands holding wire harness

to the thermal protection plate (left).

The heater unit is now free.

HEATING ELEMENT AND THERMISTOR

Remove two (2) screws holding heating element to heater duct. Loosen two (2) screws holding holders to heater duct and take heating element out of heating element holders. Heating element is free. Remove two (2) screws holding thermistor to heater duct. Thermistor is free.

Page 36

R-9H10

OVEN LAMP/SOCKET ASSEMBLY REMOVAL

1. Disconnect oven from power supply and remove

NOTE; NEUTRAL(WHITE) WIRES MUST BE

outer case cabinet.

CONNECTED TO THE TERMINAL WITH

2. Disconnect wire leads from lamp socket.

‘N’ MARK ON LAMP SOCKET.

3. Remove two(2) screws holding oven lamp to the lamp mounting angle.

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

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.

3. Secure the screws with washers firmly.

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

After the adjustment, make sure of the following:

1. The in and out play of the door remains less than

0.5 mm at latched position.

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

3.. The monitor switch contacts close when the door is opened.

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

wave survey meter. (Refer to Microwave Measurement Procedure.)

If those switches do not operate properly due to a mis-adjustment, the following adjustment should be 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

\,.

‘\

, LATCH

/ 5 HOOK

LATCH HEAD

SWITCH

Figure C-l. Latch Switches Adjustment

Page 37

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

To remove the control panel, proceed as follows:

Replacement of individual component is as follows:

Disconnect oven from power supply and remove

outer case.

Discharge the high voltage capacitor. Disconnect connector CN-A, CN-E, CN-B, CN-F,

TABI, TAB2 and TAB3 from the control unit.

Remove one (1) screw holding the control panel back plate to the chassis support. Remove the two (2) screws holding the bottom

edge of the back plate to the cabinet base.

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

oven cavity flange.

Lift up and pull the control panel forward.

Disconnect the wire connector from the control unit.

CONTROL UNIT AND KEY UNIT

Remove the four (4) screws holding the panel

frame to the back plate.

Separate the panel frame and back plate. Remove the five (5) screws holding the control unit

to the panel frame.

Lift up the control unit and disconnect the key

connector from the control unit.

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.

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

As the engaging part of choke cover and door

engaging parts.

Note:

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

3. Lift up choke cover.

4. Now choke cover is free from door panel.

Q LIFT UP

PUTTY KNIFE

CHOKE COVER

UPPER

LOWER

Figure C-2. Door Disassembly

Page 38

R-9HlO

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.

DOOR ADJUSTMENT

The door is adjusted by keeping the screws of each

hinge loose. The lower oven hinge can be loosened.

After adjustment, make sure of the following :

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

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

3. The door is positioned with its face depressed toward the cavity face plate.

4. Re-install outer case and check for microwave

leakage around the door with an approved 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.

RE - INSTALL )

Page 39

R-9HlO

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;

1. Make sure that the test instrument is operating normally as specified in its instruction booklet. Important:

Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be

used for testing.

Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500 A

SIMPSON 380M

Place the oven tray into the oven cavity. Place the load of 275 sfrl5ml of water initially at

20 +5 “C in the center of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non-conductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately. 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 the cool water. Move the probe slowly (not faster that 2.5cm/sec.) along the gap. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven.

(RDB1103U)

Page 40

R-9HlO

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Page 43

R-9HlO

PARTS LIST

Note : The voltage supplied to the parts “*I’ are greater than 250V.

REF. NO.

PART NO.

DESCRIPTION

1 cuy ICODE

ELECTRICAL PARTS

l- 1

FH-DZA005WREO

I- 2

FH-HZAOlOWREO

l- 3

QACCAA020WREO

l- 4

QFS-CAOlOWREO

l- 5

OFS-TA004WREO

High voltage rectifier ass'y Thermistor ass'y Power supply cord Fuse (M8A)

Oven temp.

fuse 145 OC

Fuse holder Oven lamp socket

Monitor switch (V-5220D-070)

Stop switch (V-ll-3C25(RB)) Upper & lower latch switches(V-5230D-600)

High voltage capacitor Convection heater Oven lamp Damper motor Turntable motor

Cooling fan motor Convection motor

Monitor resistor

0.8 n 2ow Oven therm0 cut-out Fan therm0 cut-out

1 1' 1 1

1 1

1 1 2

2 1

1 1 1 1

1 1

1 1 1

1 1 1 1 1

1 1 1

1 1 1 1 1

1 3 1 2 1

2 1 7

2 1

AL AQ

AE AG

AE AH AF AE

AF AV

AW AK

-AW AV

AG AG AG

BN BG AY

l- 6

QFSHDAOO2WREO

l- 7

QSOCLAOOlWREO

l- 8

QSW-MA009WREO

l- 9

QSW-MA037WREO

l-10

QSW-MAOSlWREO

1-11

RC-QZA068WREO

l-12

RHET-A048WREO

l-i3

RLMPTA029WREO

1-14

RMOTDA043WREO

l-15

RMOTDA097WREO

l-16

RMOTEA017WREO

l-17

RMOTEA124WREO

l-18

RR-WZA003WREO

l-19

RTHM-A024WREO

l-20

RTHM-A034WREO

l-21

RTRN-A215WREO Power transformer

l-22

RV-MZA074WREO Magnetron

1-23

FDTCTA077WRKO AH sensor

CABINET PARTS

2- 6

GFTARAOOlWRWO

2- 7

GLEGPA013WREO

2- 8

LANGK0243WRPO

2- 9

LBSHC0032WREO

2-10

LSTPP0008YBFO

FDAI-A095WRYO

Base plate assy FHNG-A092WRMO Oven hinge (lower) GCABDA037WRWO

Rear cabinet

GCABUA227WRPO

Outer case cabinet

GCOVHA156WRPO

Turntable motor cover

Oven lamp access cover

Foot Capacitor holder Cord bushing Cord anchorage (upper)

Cord anchorage

(lower)

Latch lever

Cabinet cushion

Latch hook

Schematic diagram

2-11

LSTPP0009YBFO

2-12 ’

MLEVPA122WRFO

2-13

PCUSGA023WRPO

2-14

PHOK-A043WRFO

2-15

TMAPCA471WRRO

2- 1 2- 2

;r ;

2- 5

AW AF AT BB AB

AC AB AC AB AC

AC AD AA AM AC

CONTROL PANEL PARTS

CPWBFA214WRKO Control unit

>ivcu, QPLGJ2326DREO 3-pin connector (A) QCNCMA078DREO 4--pin connector (B) QCNCMAO4ODREO 6-pin connector (E)

QCNCMAO9ODREO 3-pin connector (F) QCNCWA030DREO 12-pin connector (G)

QLUGPA004DREO Tab terminal (TABl,TAB2,TAB3) RV-KXA012DREO Fluorescent display tube RC-KZA032DREO Capacitor 0.1 ~.IF 50V RC-EZA192DREO Capacitor 1000 PF 35V

VCEAB31HW335M Capacitor

3.3 FF 50V

VCEAB31CW476M Capacitor

47 I.~F :.6V

VCKYDllCY103N Capacitor

0.01 FF 16V

BS AD AD AC AB

AE AA AX AB AD

AA AA AA

AB AA

3- 1 3- 1A 3- 1B 3- 1c 3- 1D

3- 1E 3- 1F 3- 1G Cl,21 c2

C3,81 c5 C6,7,20,

c51,5; C60,61

C8,50 Cl0

RC-KZ104QDREO Capacitor

0.1 ~.IF 25V

VCEAB31EW226M Capacitor 22 PF 25V

Page 44

R-9HlO

Note : The voltage supplied to the parts “*I’ are greater than 250V.

REF. NO.

PART NO.

DESCRIPTION

Q’TY

CODI

c53

VCKYBllEX153N Capacitor 0.015 pF 25V

1 AA

c70

RC-KZA039DREO Capacitor

0.015 FF 5OV

1 AA

C80

VCEAB31HW474M Capacitor

0.47 pF 50V

1 AA

CFI

RCRS-AOlODREO Ceramic filter (4.00MHz)

Dl-5

VHDllESl///-1 Diode (11ESl)

_-- -- ______.

D7,51,

VHDlSS270A/-1Diode (lSS270A)

D52,70, D80-88, D93-99

QFS-AA005DREO Fuse (ICP-NlOS)

--~

_--__ - ------

____-. -__--~

ICl

RH-IZA197DREO LSi

1 AW

IC2

VHIIR94558/-4 IC IR94558

VS2SB793///-4 Transistor 2SB793(R,S)

Q20,40

VSDTA143ES/lB Transistor DTA143ES

Q84-86

_____-

__-.____ ~-.-__--

Q30

RH-TZA063DREO Transistor 2SA933S

VSDTC114ES/-3 Transistor DTC114ES

1 AB

VSDTD143EA/-4 Transistor DTD143EA

1 AC

Q8l

VSDTA114YS/-3 Transistor DTAll4YS

Q82,83

RH-TZA097DREO Transistor DTB143ES

2" AC

___-

_~.__

VRD-B12EF471J Resistor

470 R 1/4w

1 _ AA

VRD-B12HF331J Resistor

330 R 1/2w

R3,60,

VRD-B12EF102J Resistor lk R 1/4W

AA R70,80, R201

VRD-B12HF751JResistor

750 n 1/2w

R5,20

VRD-B12EF153J Resistor 15k n 1/4W

2 AA

RlO

VRD-B12HF360J Resistor

36 R 1/2W

R40,

VRD-B12EF332JResistor 3.3k n 1/4W

12 AA

R93-103

R50

RR-DZA069DREO Resistor block

1 AD

R51 VRS-B13AA331J Resistor

330 n 1w

R52

VRN-B12EK182F Resistor 1.8k n (F) 1/4W

R53

VRN-B12EK364F Resistor

360k n (F) 1/4W

1 AA

R54

VRD-B12EF103J Resistor

10k n 1/4W

R55

VRD-B12EF473J Resistor

47k n i,'4W

1 AA

R61,202 VRD-B12EF273J Resistor

27k R 1/4W

R62 VRN-B12EK753F Resistor

75k R (F) 1/4W

1 AA

R63

VRN-B12EKlOlF Resistor 100 n (F) 1/4W

R64 VRN-B12EK222F Resistor

2.2k n (F) 1/4W

R81,86 VRD-B12EF680J Resistor

68 n 1/4w

R200 VRD-B12EF105J Resistor 1M n 1/4W

RY1,4-6 RRLY-A020DREO Relay (OJSH112LM)

4" AH

RY2 RRLY-2118DRE0 Relay (VS12SMBU)

1 AM

RY3 RRLY-A013DREO Relay (OMI-SH112D) 1 AM SP40 RALM-A007DREO Buzzer (PKM22EPT) 1

AF I1 RTRNPA023DREO Transformer 1 AR VRSl

RH-VZAOlODREO Varistor (15G471K) 1

AE ZDl

VHERDlGEB3/-1Zener diode (RD16EB3) 1 AB

ZD3

RH-EZA105DREO Zener diode (RD4.3ESB2) 1 AA

;I '3

FPNLCA587WRKO Control panel flame with key unit

,ni i;

JBTN-A315WRFO Open button 1 AC

3- 4

MSPRDA009WREO Open button spring 1 AA

3- 5

LANGTA197WRWO Control panel back plate

1 AK

3- 6

MLEVFA042WRWO Open lever

AC 3- 7

NSFTTA030WREO Open shaft

1 AB

;I g

XHPSD30P12XSO Screw;control unit mtg.

3 AA

XCPSD40P12000 Screw;control panel back plate mtg.

4 AA

OVEN PARTS

4- 1

FBRGMA002WREO Bearing ass'y

4- 2

FDUC-A124WRWO Steam duct ass'y

4- 3

FFANJ0034WRKO Cooling fan ass'y

1 AF

4- 4

FFTA-A022WRKO Damper ass'y

1 AE

4- 5

FOVN-A144WRYO Oven cavity

;I ;

FROLPA032WRKO Roller stay

1 AP

LANGFA089WRWO Chassis support

1 AE

4- 8

LANGQA136WRWO Convection motor mounting plate

1 AE

Page 45

R-9HlO

The vnltme sklnnlied tn the narts “*w are areater than 3%X/

Note : . ..- __.__ ~- --rT ..-- _- - .-

r -.-- -. - a- ----- -..-.. --- _.

REF. NO.

PART NO.

DESCRIPTION

Q’TY

COD1

4- 9 LANGQA157WRWO

Lamp socket mounting angle

4-10

LANGQA163WRPO Thermal cut-out mounting angle

4-11

LANGTA196WRWO Bearing mounting plate

4-12

LBNDK0054WREO Heater element holder

2" AB

4-13 LFIX-A013WRWO

Bearing holder plate

1 AB

4-14 LHLDK0005YBFO

Cord holder

1 AB

4-15 MCAMPA030WRFO

Damper cam

4-16 MHNG-A165WRMO Oven hinge (upper)

4-17 NBLTKA005WREO

Convection fan belt 1

4-18 NCPL-A021WRFO

Turntable coupling

4-19 NFANMA019WRWO

Convection fan

1 AE

4-20 NPLYBA025WRFO

Pulley (M)

4-21 NPLYBA025WRFO

Pulley (M)

1 AC

4-22 NSFTTA043WREO

Damper shaft

4-23

NTNT-A019WRHO Turntable tray '1

4-24

PCOVPA157WREO Waveg-uide cover

4-25 PCOVPA167WRFO

AH sensor cover

AD AC

4-26

PCUSGA211WRPO Transformer cushion D

4-27 PCUSUA146WRPO

Magnetron duct cushion :

4-28 PCUSU0263WRPO

Cushion

2 AA

4-29 PCUSU0329WRPO

Cushion

4-30 PCUSU0380WRPO Steam cushion C

4-31 PDUC-A267WRPO

Heater duct 1

4-32 PDUC-A269WRWO

Damper duct

4-33 PDUC-A270WRFO Cooling fan duct

4-34

PFPF-A049WREO Thermal protection sheet (left) 1

4-35

PREFHA028WRPO Thermal protection plate (left)

1 AM 4-36 PFPF-A050WREO Thermal protection sheet (right) 1 AK 4-37 PGLSPA181WREO Oven lamp screen

4-38

PREFHA027WRPO Thermal protection plate (right) 1 AL

4-39 PSKR-A151WRWO Air guide (A)

4-40 PSKR-A152WRPO

Air guide (B) 1

4-41 PSKR-A153WRPO

Air guide (bottom)

4-42 PSKR-A156WRPO

Air guide (C) 1

4-43 PSKR-AlGlWRWO

Air guide (right)

4-44 PSKR-A171WRPO

Magnetron air guide

4-45 PCUSGA221WRPO

Cushion 1

* *

DOOR PARTS

CDORFA357WRKO Door assembly, complete

5- 1 DDORFA262WRYO

Door panel

:: BH

z- - 2 3 GCOVHA155WRFO Choke cover

GWAKPAllOWRFO Door frame

5- 4 HDECQA107WRFO Door sash (right)

:- - 5 6 HDECQA108WRFO

Door sash (left)

LSTPPA045WRFO Upper latch head t AB

5- 7 LSTPPA046WRFO

Lower latch head

5- 8 MSPRTA007WREO

Latch spring

5- 9 NSFTTA044WREO Latch shaft

5-10 PGLSPA180WREO

Door glass

1 AX

MISCELLANEOUS

6- 1 FAMI-A024WREO

High rack 1

6- 2 FAMI-A025WREO

Low rack

6- 3 TCADCA220WRRO

Cook book'{Convection cooking)

TCADCA226WRRO Cook book(Microwave cooking) t AY

6- 4 TINSEA430WRRO

Operation manual

66: 2 LBNDK0012YBEO

Wire holder (WH-1 84mm ) 1

FW-VZA664WREO Main wire harness

1 AX

6- 7 QW-QZA099WREO

High voltage wire A

6- 8

QW-QZAlOOWREO High voltage wire B

6- 9 FW-VZA591WREO Thermistor harness

6-10 TLABSA018WRRO Fuse label

AB 6-11 LHLDWQ004YBEO Wire holder (purse lock "L") 1 AA 6-12 QTANP0020YBEO

Connector CE-230

1 AA

6-13 TCAUH0114WRRO Caution label

Page 46

R-9HlO

Note :

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

REF. NO.

PARTNO.

DESCRIPTION

Q'TY

CODE

6-14

TSPCNA984WRRO Name plate

1 AC

SCREW,NUTS,WASHERSAND PINS

7- 1

LX-BZ0186WREO Screw;

high voltage rectifier ass'y,

convection motor ass'y,

monitor resister,

turntable motor covering

and oven lamp access cover mtg.

7- 2

LX-BZ0202WREO Screw; upper

& lower latch heads mtg.

2 AB

7- 3

LX-CZA020WREO Screw; oven hingescupper

& lower) mtg.

7- 4

LX-CZ0017WREO Screw; heater element holders, thermister ass'y,

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

7- 5

LX-CZ0043WREO Screw;

thermal protection plate(left), bearing holder plate and

convection motor ass'y mtg.

7- 6

LX-CZ0052WREO Screw; latch hook mtg.

7- 7

LX-EZA034WREO Screw; (LHSTIX LR-4) outer case cabinet mtg.

7- 8

LX-NZ0029YREO Screw;

steam duct ass'y mtg.

1 AA

7- 9

XBPSD30P14KOO Screw; damper switch mtg.

7-10

XBPSD40P06KOO Screw;

convection motor ass'y mtg.

A*A

7-11 XBPSD40P25000 Screw;

cooling fan motor mtg.

2 AA

7-12

XFPSD40P30000 Screw; cord anchorages mtg.

7-13

XBTUW40P06000 Screw; waveguide cover mtg.

; AA

7-14

XBTUW40P08000 Screw; heater unit ass'y, steam duct,

oven lamp mounting angle,

bearing mounting plate and

convection heater mtg.

7-15

XCPSD30P06000 Screw; damper motor, oven therm0 cut-out

and fan therm0 cut-out mtg.

7-16

XCPSD30P08XSO Screw;

oven lamp socket mtg.

7-17

XCPSD30P08XOO Screw;

door flame and door sash(left) mtg.

: AA

7-18

XCPSD30P08000 Screw; door flame mtg.

7-19

XCPSD40P08000 Screw; door sashlright),

7 AA

thermal protection platecright),

air guide(right) and damper ass'y mtg.

7-20

XCTSD40P08000 Screw; steam duct mtg,

3 AA

7-21 XBPSD30P08000 Screw; AH sensor ass'y mtg.

7-22 XFPSD40P08KOO Screw;

oven lamp mounting angle,

: AA

high voltage rectifier ass'y,

power supply cord grounding and

thermistor harness grounding mtg.

7-23 XFPSD40P08000 Screw;

turntable motor and magnetron mtg.

7-24 XFPSDGOP14JSO Screw; power transformer mtg.

7-25

XNESD40-32000 Nut;

cooling fan motor and

upper

& lower latch heads mtg.

7-26 XNEUW40-32000 Nut;

convection fan mtg.

7-27 XOTSC40P12000 Screw;

outer case cabinet mtg.

7-28 XOTSD40P12RVO Screw; base plate, T/C panel and

11 AA

chassis support mtg.

7-29

XOTSD40P12000 Screw; rear cabinet, wire ho&der,

cord holder and chassis support mtg.

7-30

XWSUW40-10000 Washer; convection fan mtg.

1 AA

7-31

XWWSD60-08000 Washer; power transformer mtg.

7-32

XFPSD30PlOOOO Screw; fuse holder mtg.

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 47

F’

. 1

I 4

Page 48

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