Sharp R-8470, R-8570 Service Manual

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Page 1

SHARP SERVICE MANUAL

S9610R8470Jll

COUNTER TOP

CONVECTION

MICROWAVE OVEN

Photo R-8470

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

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

TABLE OF CONTENTS

Page

FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................... 1

CAUTION, MICROWAVE

RADIATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

PRODUCT DESCRIPTION

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

OPERATION INSTRUCTIONS

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

OPERATION

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

.I.. ...............................................................

SERVICING .....................................................................................................................................................

TOUCH CONTORL

PANEL ASSEMBLY

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

COMPORNENT

REPLACEMENT AND ADJUSTMENT

PROCEDURE

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

MICROWAVE MEASUREMENT

PROCEDURE

.......................................................................................... 34

PACKING AND ACCESSORIES

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

PICTORIAL DIAGRAM

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

CONTROL PANEL

CIRCUIT (R-8470)

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

CONTROL PANEL

CIRCUIT (R-8570)

....................................................................................................... 39

PRINTED WIRING

BOARD ..........................................................................................................................

PARTS LIST .................................................................................................................................................... 42

SERVICE INFORMATION

FOR CONTROL

UNIT ...................................................................................... 47

SHARPCORPORATION

Page 2

I--

R-8470 R-8570

(R-8470)

(R-8570)

Page 3

R-8470 R-8570

SERVICE MANUAL

SHARP

COUNTER

TOP

CONVECTION MICROWAVE

OVEN

R-8470/ R-8570

FOREWORD

This Manual has been prepared to provide Sharp Corp. Service

Personnel with complete Operation and Service Information for

the SHARP CONVECTION MICROWAVE ovens, R-8470/

R-8570.

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 at-

tention should be given to avoid electrical shock and microwave

radiation hazard.

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 nicrowave energy absorbing load attached. Never look into

an open waveguide or antenna while the device is energized.

SHARPCORPORATION

OSAKA, JAPAN

$4 ”

PRODUCT

DESCRIPTION

%a%

, ^

k: OPERATING INSTRUCTIONS

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OPERATION

I SERVICING

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CONTROL

COMPONENT

REPLACEMENT AND

ADJUSTMENT

MICROWAVE MEASUREMENT

PARTS

LIST

Page 4

R-8470 R-8570

PRODUCTION DESCRIPTION

EXPLANATION OF MICROWAVE COOKING AND CONVECTION COOKING

The Sharp Convection-Microwave Oven uses micro-

cules are changing direction every half cycle or oscil-

wave energy and the sheath heater to produce heat in

lating back and forth 4,900,000,000 times per second.

the food to be cooked.

This high speed oscillation causes friction between the

Unlike conventional ovens microwave energy will cook

foods without applying external heat.

molecules, thereby converting the microwave energy to heat.

Microwaves, which are short electromagnetic waves of RF (radio frequency) energy, pass through materials guch as glass, paper, china and most plastics. Materials such as metal and aluminum foil tend to reflect microwaves and may be used only as recommended in the cooking instructions.

Materials with a high moisture content, like most foods, will absorb microwave energy. As the microwave energy at a frequeny of 2450 Megahertzenters the food, the molecules align themselves with the energy. Because the microwave are changing polarity every half cycle, the food mole-

However, cooking by microwave energy only, produces no browning or searing (unless cooking a roast of sufficient thickness). This microwave oven is, therefore, equipped with a sheath heater to provide browning of the food. The combination of the heater plus high-speed circu-

lation of air by a circulating fan around the food provides fast cooking and

browning

of foods conventionally with or without the addition of microwave energy.

SPECIFICATION

ITEM

Power Requirements

Power Output

Convection Power Output

Case Dimensions

Cooking Cavity Dimensions

Control Complement

Set Weight

DESCRIPTION

240 Volts 6 Amperes (Microwave)

6.7 Amperes (Convection) 50 Hertz Single phase, 3 wire earthed

700 watts normal of RF microwave energy (2 liter water lod) Operating frequency of 2450MHz

1500 Watts Width 627 mm

Height 408 mm including foot Depth 505 mm

Width 395 mm Height 256 mm

Depth 422 mm

Micrwave Power for Variable Cooking

Repetition Rate;

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

Full power throughout the cooking time

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

MEDIUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 50% of Full Power

MED.LOW(DEFROST) . . . . . . . . . . . . . . . . . . . . . . . . approx. 30% of Full Power

LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 10% of Full Power

Convection Temperature Control Range;

40 to 250 “C Auto Start Cooking Comp Defrost Cooking Convection Cooking

Instant Cooking Sensor Cooking (R-8570 only) Compu Cooking (R-8570 only)

Approx. 34 kg

Page 5

R-8470 R -8570

OPERATING INSTRUCTIONS

R-8470

3-m

@ INDICATORS @I COMPU DEFROST SYMBOL @ CONVECTION FAN SYMBOL

Touch to select Compu Defrost setting.

INSTANT COOKTM PAD

Touch to cook for 1 minute at HIGH or increase bv 1 minute multioles durina variable

Il/~h

cooking.

NUMBER AND TEMPERATURE PAD

Touch to enter cookina times. clock time or convection temperature.

CONVECTION COOKING FUNCTION PADS

Touch to cook for each function.

VARIABLE COOKING CONTROL PADS

Touch to select microwave power setting If not touched, HIGH is automatically selected.

TIMER/HOLD PAD

Touch to set minute timer or HOLD the setting.

AUTO START/CLOCK PAD

Touch to set clock or auto start time

STOP/CLEAR PAD

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

FT@-+= “MEL PEtart oven.

R-8570

pucO~~~~~~~~ FAN SYMBOL

1 ”

CONVECTION FAN SYMBOL

QY+ @@/g/tg&iMIX MID “16” Wli ID

CON” MED Low RAM MO AUTO stm mm. aimi cm -

COMPU DEFROSTTM SYMBOL

This symbol flashes and varies in size whenever the compu defrost power IS on.

LIGHTED DIGITAL DISPLAY

Shows readout of cooking time. cooking instruction or time of day.

INDICATORS

.- CONYECTlON

, not _

--A

_~~

LOW MIX

-T-.-L ye

-,7 -\ IYGH

AS, SL35,

-ym GRlli

+==-A-

.- SLOW COOK

5 mot

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~-.

&MEDLOW’ I

E of/ml ~

__= Med aare

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8 22x

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~ 0 W.::s”. I ,

0 25592

iMEP 1 A T STAR, I HOLD , CLOCK /

CONVECTION COOKING FUNCTION PADS

Touch to cook with each function.

SENSOR COOK PAD

Touch to select Sensor Cook settings.

COMPU COoKTM PAD

Touch to select CompuCook settings.

INSTANT COOK PAD

Touch to cook for 1 minute at HIGH or Increase by 1 minute multiples during variable cooking.

COMPU DEFROSTTM PAD

Touch to select CompuDefrost settings.

NUMBER AND TEMPERATURE PADS

Touch to enter cooking times, clock time or convection temperature.

VARIABLE COOKING CONTROL/FOOD DONENESS SETTING PADS

Touch to select mIcrowave power setting. If not touched, HIGH IS automatlcallv selected. Touch to select food doneness setting for CompuCook. If not touched, Med Done IS automatlcallv selected.

TIMER/HOLD PAD

Touch to set the minute timer or hold (pause) the cooklng cycle during a multlple sequence programme.

AUTO START/CLOCK PAD

Touch to set clock or auto start time.

START PAD

Touch to start oven.

STOP/CLEAR PAD

Touch to erase during programnxng. Touch once to stop operanon of oven during cooking; touch twice to cancel cooking program.

Page 6

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

i I

The

following is a description of component functions

during oven operation.

OFF CONDITION

Closing the

door activates

both door interlock

switches: upper latch switch and lower latch switch.

(In this condition,

the monitor switch contacts are

opened

The

stop switch is activated (contacts closed) by the

latch head, when the door is closed. When oven is plugged in, the 240 volts A.C. is supplied to the relay unit. (Figure O-l).

I, The

display will show flashing

“88:88”.

To set any program or set the clock, you must first touch the STOP/CLEAR (or STOP/CANCEL) 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

on.

2. A signal is input to the control unit, energizing the coil of shut-off relay (RY6).

RY6 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 RY6 is de-energized, opening its contacts, thereby turning off the damper motor.

COOKING CONDITION

HIGH COOKING

Program desired cooking time and Variable Cooking Control by touching the NUMBER pads and the HIGH pad of the Variable Cooking Control. When the COOK

(or START) pad is touched, the following operations

occur:

1. The contacts of relays are closed and components connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY CONNECTED COMPONENTS

RY-1 power transformer RY-2

oven lamp/turntable motor

RY-3

convection motor

Fly-4

heating element

RY-5

fan motor

RY-6

damper motor

2. The 240 volts A.C. is supplied to the primary wind-

ing of the power transformer and is converted

about 3 volts A.C. output on the filament winding, and approximately 2200 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, stop switch, upper latch 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 opens their contacts, and then the monitor switch contacts close.

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

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

the upper latch switch failes with their contacts

closed when the door is opened, the closing of the

monitor switch contacts will form a short circuit through the monitor fuse, upper latch switch , causing the monitor fuse to blow.

MED.HIGH, MEDIUM, MED.LOW(DEFROST),

LOW

COOKING

When the Variable Cooking is programed, the 240 A.C. voltage

is supplied

to the power transformer intermittently through the contacts of the relay which is operated by the control unit within a 32 second time base. The microwave power operation is as follows:

VARI-MODE

ON TIME OFF TIME

HIGH

32 sec.

0 sec.

(approx. 100% power)

MED.HIGH

24 sec.

8 sec.

(approx. 70% power) MEDIUM

18 sec.

14 sec.

(approx. 50% power) MED.LOW( DEFROST) 12 sec.

20 sec.

(approx. 30% power) LOW

6 sec. 26 sec.

(approx. 10% power)

Note: The ON/OFF time ratio does not correspond

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

CONVECTION COOKING CONDITION

PREHEATING CONDITION

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

Page 7

R -8470 R-8570

The coil of shut-off relays (RY2, RY3 and RY5) are

energized, the oven

lamp, cooking fan motor,

turntable motor and convection motor are turned

on.

The coil of relay (RY6) is energized by the control

unit. The damper is moved to the closed position, opening the damper switch contacts.

The opening of the damper switch contacts sends

a signal to the LSI on the control unit

de-energizing the relay (RY6) and opening the circuit to the damper motor. The coil of heater relay (RY4) is energized by the

control unit and the mains supply voltage is added

to the heating element.

When the oven temperature reaches the selected

preheat temperature, the following operations oc-

cur:

4-1.

4-2.

The heater relay is de-energized by the control unit temperature circuit and thermistor,

opening the circuit to the heating element.

The oven will continue to function for

minutes, turning the 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 temper-

ature by touching the NUMBER pad, CONVECTION

pad and Temperature pad.

When the START pad is touched, the following oper-

ations occur: I.

The numbers of the digital readout start the count

down to zero. The oven lamps, turntable motor, cooking fan motor and convection motor are energized.

Heater relay (RY4) is energized (if the cavity tem-

perature is lower than the selected temperature)

and the mains supply voltage is added to the

heating element to return to the selected cooking temperature.

Upon completion of the cooking time, the audible signal will sound, and oven lamps, turntable motor, cooking fan motor and convection motor are de-energized. At the

end.of

the convection cycle,

if the cavity air temperature is above 120

OC,

the circuit to RY5 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 100

OC,

at which time the relay will be de-energized, turn-

ing off the fan motor. Relay RY3 will however,

open as soon sa the convection cycle has ended,

turning off the convection fan motor. This will now

cool and allow the damper door to open. At the end of the convection cook cycle, shut-off relay (RY6) is energized turning on the damper motor. The damper is returned to the open position,

closing the damper switch contacts which send a signal to the control unit, de-energizing shut-off relay (RY6).

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 oper-

ations occur:

The numbers of the digital readout start the count down to zero. The shut-off relay (RY2, RY3 and RY5) are

ener-

gized, turning on the oven lamps, turntable motor, and cooling fan motor.

The shut-off relay (RY6) is energized.

The damper door is closed from the open position.

The heater relay (RY4) is energized, adding the

mains supply voltage to the heating element. 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

heating element and power transformer alternately.

6-2. The heating element operates through the

heater relay (RY4) contacts and the power transformer operates through the cook relay

(RYI ) contacts.

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

supply alternately within a 32 second time base, convection heat and microwave en-

ergy.

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, be-

cause approx. 2 seconds are needed for heating

of the magnetron filament.

MICROWAVE

POWER

(MICR0.l

Appmx.

10%

‘ON

I I

CONVECTION TEMPERATURE

OFF

184vc

LOWMIX’

BAKE

lCONVEC.1

32 UC.

I-

HIGH MIX

-ROAST

MICROWAVE

FOWER

- A~ox. 30%

CONVECTION TEMPERATURE

2oo”c

Note: During alternate Microwave/Convection opera-

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

Page 8

R-8470 R-8570

SENSOR COOKING CONDITION (R-8570

only)

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 in-

creases gradually. When the resistance reaches the

value set according to the menu, supplementary cook-

ing is started. The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI.

An example of how sensor works:

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

2. Heat broccoli. Moisture ‘and humidity is emitted

rapidly. You can smell the aroma as it cooks.

3. Sensor detects moisture and humidity and calcu-

lates 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.

2. Select desired Sensor setting.

3. Touch START pad.

The coil of shut-off relay (RY-1) is energized, the

oven light and cooling fan motor are turned on, but

the power transformer is not turned on.

4. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to re-

move 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.

6. When the timer reaches zero, an audible signal sounds.

The shut-offrelay and cook relay are de-energized and the power transformer, oven light, etc. are turned off.

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

COMPUCOOK (R-8570 only)

COMPUCOOK will automatically compute the oven

temperature, microwave power and cooking time for

baking, roasting and broiling. Set the

desired

program by

touching

the

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

1.2.The COOK indicator will light and the Convection Fan Symbol will rot ate.

The cooking time will appear on the display and start counting down to zero. The cooking time is adjusted automatically ac-

cording to the setting quantity or weight of food.

The shut-off relays (RY2, RY3, RY4 and RY5) are

energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The power supplay voltage is added to the heating element.

Now, the oven is in the convection cooking mode. When the oven temperature has reached the programmed convection temperature, the oven goes

into the programmed cooking mode. At the end of the COMPUCOOK cycle, the damper

is returned to the open position and the oven will be off condition. The cooling fan will remain on until the oven has cooled.

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to defrost meats and poultry faster and better.

COMPU DEFROST 1 to 5 automatically defrosts roast beef, etc. Each key has 3 defrost stages.

When the desired COMPU DEFROST number is

lected

and the food weight is entered by using

number pad’s, the oven will cook according to

special cooking sequence.

se-

the the

Page 9

R-8470 R-8570

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Page 10

R-8470

-8570

DESCRIPTION AND FUNCTION OF COMPONENTS

UPPER

AND

LOWER LATCH

SWITCHES

The upper and lower latch switches are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to the power transformer, etc. For detais, refer to Oven Schematic diagram. And the switches interrupt the circuit to the heating element for model which is provided the heating element. A cook cycle cannot take place until the door is firmly closed thereby activating both latch switches.

’

UPPER

LATCH

normally closed. At this time the upper latch switch are in the OFF condition (contacts open) due to their being normally open contacts switches.

2. As the door goes to a closed position, the monitor switch contacts are first opened and then the upper

latch switch contacts close. (When opening the

door, each of these switches operate inversely.).

3. In the door is opened and the upper latch switch contacts fail to open, the fuse blows simultaneously with the closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN FUSE,

TEST THE MONITOR SWITCH, UPPER

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

DOOR OPEN

MECHANISM

The door can be opened by grasping the door handle and pulling strong. When the door is pulled, the lower and upper latch

heads mounted in the door are raised up to release them from the latch hooks. The door can now be opened.

LATCH

SWITCH

Latch,Monitor

and

stop

Switch

MONITOR SWITCH The monitor switch is activated (the contacts opened) by the upper latch head on the door while the door is closed. This switch is intended to render the oven inoperative by means of blowing the fuse when the contacts of the upper latch switch falles to open when the door is opened. Functions:

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

tacts close (to ON condition) due to their being

UPQER

LATCH

LOWER LATCH

HEAD

Figure D-2. Door

Open

Mechanism

Page 11

-8470

R-8570

DAMPER OPEN-CLOSE MECHINISM

Usually, the damper is open position except during the

convection cooking.

Damper position is set automatically by damper motor, damper switch, motor cam and damper shaft. These components are operated according to the signal that judges the microwave cooking or convection cooking operation in the control unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooking 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:

l-l.

1-2.

1-3.

I-4.

l-5.

When power supply cord is plugged in, a sig-

nal is sensed in the control unit, and operates

the shut-off relay (RY6).

Contacts of shut-off relay (RY6) close, then

the damper motor is energized, opening the

damper door.

When damper is moved to the open position

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 (RY6) 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.

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 (RY6)

is de-energized. The damper is held in the closed position

during the convection cooking operation.

At the end of the convection cooking, the shut-off relay (RY6) is energized, and damper

is returned to the open position.

DAMPER

,,,i’

DAMPER

DAMPER CAM

YAMPER

MOTOR

Figure

D-3.

Damper

Page 12

R-8470 R-8570

SERVICING

TROUBLESHOOTING GUIDE

When troubleshooting the microwave oven, it is

IMPORTANT: If then oven becomes inoperative

be-

helpfull to follow the Sequence of Operation in

per-

cause of a blown monitor fuse in the

forming the checks. Many of the passible causes of

monitor switch and upper latch switch

trouble will require that a specific test be performed.

circuit, check the monitor switch and

These tests are given a procedure letter which will be

upper latch switch before

replaceing

found in the “Test Procedure”section.

the monitor fuse.

PROBLEM

POSSIBLE

CAUSE

TEST

PROCEDURE OR I

CORRECTION

OFF CONDITION

Home fuse blows when power

Shorted wire in power cord or wire har-

Replase cord or check wiring.

cord is plugged into wall recepta-

ness.

cle.

Monitor fuse blows when power

Shorted wire in power cord or wire har-

Replace power cord or check

cord is plugged into wall recepta-

ness.

and repair harness.

de.

Defective monitor switch.

Procedure F.

88:88 do not appear in display No power at outlet.

Check home fuse.

when power cord is first plugged

Blown monitor fuse.

Psocedure G.

into wall outlet.

Blown magnetron temp. fuse.

Psocedure H.

Open wire in power cord, wiring harness,

Replace or repair wiring. or wiring between control panel assembly units.

Defective control unit.

Procedure K. Defective relay unit.

Procedure J.

Display does not operate properly

Defective key unit.

Procedure L.

when

STOP/CLEAR

key is

touched. (Buzze should sound

defective control unit.

Procedure K.

and time of day should appear in

Defective relay unit

Procedure J.

display.)

Defective stop switch

Procedure E.

Oven lamp does not light with No power in home.

Check wall outlet.

door opened.

Open wire in power cord or wire harness. / poplace same or repair wir-

I I

Defective oven lamp.

Replace.

Defective upper latch switch.

Procedure E.

Open or loose wire connection to the Check wiring. above components.

Blow monitor fuse or magnetron temp. / Procedure G or H.

fuse.

Page 13

R-8470 R-8570

PROBLEM

POSSIBLE

CAUSE

TEST

PROCEDURE OR

CORRECTION

COOKING CONDITION

Oven lamp does not light in cook

Defective shut-off relay

(RYZ)

on relay Procedure J.

cycle.

unit.

(Does light when door is opened)

Defective control unit

Procedure K

Oven lamp does not light at all.

Burned out bulb.

Replace

Open wiring of oven lamp.

Check and repair wiring

’

Oven lamp lights, but turntable

Open or loose wiring to turntable motor.

Check and repair wiring

motor does not operate.

Defective turntable motor.

Replace

Turntable motor operates normally

Defective cooling fan motor.

Replace.

but cooling fan motor dies not

Defective shut-off relay (RY5) on relay Replace

operate

unit. Open or loose wiring to fan motor

Check and repair wiring

MICROWAVE

Oven des 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.)

I-

Oven does into a cook cycle but extremely

uneven

heating is

produced in oven 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 COMPU DEFROST cooking mode

Upper and/or lower latch switches

defec-

Procedure E.

tive or out of adjustment. Defective cook relay (RYI ) on relay unit.

Procedure J.

Defective control unit.

(

Procedure K.

Defective key unit.

Procedure L.

Open or loose wiring to above compo-

Check and repair wiring

nents.

Defective magnetron.

Procedure A.

Defective cook relay

(RYI )

on relay unit.

Procedure J.

Defective power transformer.

Procedure B.

Defective rectifier.

Procedure C.

Defective high voltage capacitor.

Procedure D.

Defective control unit.

Procedure K.

Open or loose wiring to above compo-

Check and repair wiring nents. Low voltage. Dirty oven cavity.

Turntable motor does not operate. Refer to proceding turntable

motor problem.

Defective control unit.

Procedure K. Defective key unit.

Procedure L. Open or loose wiring to above compo-

Check and repair wiring nents.

Defective COMPU DEFROST function.

Refer to COMPU DEFROST

section on operation manual

and check control unit.

Page 14

PROBLEM

POSSIBLE

CAUSE

TEST PROCEDURE OR

CORRECTION

CONVECTION

CONV indicator light but oven Defective key unit.

Procedure L

does not go into a cook cycle Defective thermistor.

Porcedure N

when START pad is touched.

Open wiring in circuit to above compo- Check and repair wiring.

nents.

CONV indicator lights, but heating

Defective heating element.

Procedure I

element does not heat.

Defective heater relay(RY4) on relay unit.

Porcedure J

Defective control unit.

Procedure K

’

Open or loose wire connection

to the Check and repair wiring.

above components

Temperature in the oven cavity is

Defective heating element.

Procedure I

lower or higher than preset,

Defective control unit.

Porcedure K

Defective convection mortor.

Replace motor.

Defective thermistor.

Procedure N

Defective cooling fan motor.

Replace

Defective dumper motor

Procedure 0

Defective drive mechanism of convection Check.

fan.

SENSOR (R-8570)

Oven is in the sensor cooking AH sensor open and/or short. condition but AH sensor does not

Defective control unit.

Procedure M Procedure K

- <-

end stage 1 or does not stop

Open or loose wire connection

to the Check and reapir wiring.

cooking cycle.

above components.

Page 15

R-8470 R-8570

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: rectifier, high voltage capacitor, heater transformer and power transformer.

MICROWAVE OUTPUT

POWER

Microwav,e 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;

P x t / 4.2 = V x 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

..I20

seconds (2 minutes)

P=7Ox

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 two minutes 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 satisfactory, execute the measurement several times and judge the result from the synthetic point of view. Microwave output power should be within

&--I

5% of the nominal one.

Calculation of output power; Microwave output power . ..P (W) = 70 x 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.

1. Initial temperature of salt water should be 20 + 1

“C.

(The salt water should be contained bon (1) percent of salt.) 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.

Page 16

TEST PROCEDURES

(CONT’D)

PROCEDURE

LETTER

COMPONENT

TEST

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

4. Room temperature should be around 20

“C.

5. Power supply voltage should be specification voltage.

POWER

TRANSFORMER

TEST

DISCHARGE THE HIGH VOLTAGE

CAPACITAOR

BEFORE TOUCHING ANY OVEN COMPO-

NENTS OR WIRING. Disconnect the primary input terminals and measure the resistance of the transformer with an

ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 73 ohms; the resistance of the filament coil should be less than 1 ohm.

(HIGH VOLTAGES ARE PRESENT TO HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO

MEASURE THE FILAMENT AND HIGH VOLTAGE.)

SILICON

RECTIFIER TEST

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

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

HIGH VOLTAGE CAPACITOR

TEST

DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO-

NENTS 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 an open circuit once the capacitor is charged. If the above is not the case, check the capacitor with the ohmmeter to see if it is short circuited

between the terminals. If it is short circuited, replace the capacitor.

SWITCH

TEST

Isolate the switch and check the connection by using the ohmmeter accord ing to the following table.

If improper operation is indicated, make the necessary switch adjustment or replacement.

Table: Switch Connection

Connection

Common Terminal-Normally Open Terminal

Common Terminal-Normally Close Terminal

(COM)

(NO)

(COM)

(NC)

Operation

Open circuit

Close circuit

Plunger released

Plunger pushed

Closed circuit

Open circuit

MONITOR SWITCH

TEST

Before performing this test, make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure. Check the monitor switch operation by using the ohmmeter as following figure. When the door is open, the meter should indicate a closed circuit. When the monitor switch lever of the upper latch hook is pushed by a screw driver through the upper 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.

Page 17

R-8470

-8570

PROCEDURE

LETTER

COMPONENT

TEST

4JPPER

LATCH

ITOR

MONITOR SWITCH LEVER

BLOWN

MONITOR

FUSE

If the monitor fuse in the primary-secondary-monitor switch circuit is blown when the door is opened, check the primary and secondary interlock switches and monitor switch according to the Test Procedure of those switches, before replacing the blown monitor fuse.

If the monitor fuse is blown by improper switch operation, adjust or replace the defective switch and monitor fuse at the same time.

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

TEMP.

FUSE TEST

A continuity check across the temp. fuse terminal should indicate a closed circuit. If the temperature of the magnetron reaches 115

OC, thne

temp. fuse opens. If the temp. fuse has opened, replace the fuse. An open temp. fuse indicates overheating of the magnetron assembly. Check for restricted air flow to the magnetron through the opening in the chassis, especially the cooling duct.

HEATING ELEMENT

TEST

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

resistance between the heating element terminals should be approximately 38.4 ohms.

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

resistance meter.

The insulation resistance between heating element terminal and cavity should be more than

0.5M

Page 18

R-8470

-8570

TEST

PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT

TEST

RELAY

UNIT

TEST

The relay unit consists of circuits including the shut-off relays, buzzer, transformer, etc.

Plug power cord into wall receptacle “88888” will be flashing in the display. Remove the outer case and check voltage between Pin Nos.

1 and 3 of the

12-pin

connector

(A) on the relay 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 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

RYl

(COOK) RY2 RY3 RY4 (HEATER) RY5 RY6

OPERATIONAL

VOLTAGE

Approx. 14 V.D.C. Approx. 14 V.D.C. Approx. 14 V.D.C. Approx. 14 V.D.C. Approx. 14 V.D.C. Approx. 14 V.D.C.

CONNECTED COMPONENTS

Power transformer Oven lamp/Turntable motor Convection motor Heating element Cooling fan motor Damper motor

TOUCH CONTROL PANEL ASSEMBLY

TEST

The touch control panel consists of circuits including semiconductors such as LSI,

ICs, etc,

Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with

only a voltmeter and ohmmeter.

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

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

placement is described according to the symptoms indicated.

1. Key Unit.

The following symptoms indicate a defective key unit. Replace the key un it.

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

asignal.

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 when it lights-up.

c) Only one indicator does not light up. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 2-3 Other possible troubles caused by defective control unit. a)

Buzzer does not sound or continues to sound.

b) Clock does not operate properly.

c) Cooking is not possible. d) Proper temperature measurement is not obtained.

Note: When a defective one or more of three components, the Control Unit, Key Unit or Relay

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.

Page 19

R-8470 R-8570

TEST

PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT

TEST

KEY UNIT

TEST

If the indicator does not respond to touching a key Pad use the following matrix and place a

jumper wire between the proper pin connections with the cable connector disconnected from the

control unit.

If the indicator responds and oven goes into operation, the key unit was faulty. If there is no response, replace the control unit.

KEY UNIT

4:R-B!noW

SENSOR TEST

Checking the initial

sensor

cooking condition

(1) The oven should be plugged in at least five minutes

befor

sensor cooking.

(2) Room temperature should not exceed 35

“C.

(3) The unit should not be installed in any area where heart and steam are generated. The unit

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

(4) Exhaust vents are providend 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 circuration.

(5) Be sure the exterior of the cooking container and the interior of the oven arer 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) Foods weighing less than 3 ounces should be cooked by time and vaiper power. (8) 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

befor

food is propary

cooked. (9) After 30 minutes it the sensor has not detected the vapor of the food, ERROR will appear

and the oven will shut off. When cooking bacon, the sensor must detect the vapor within

1-l /2 minutes before ERROR appeares and oven shuts off.

Water

load

cooking test

Make sure the oven has been plugged in at least five minutes before checking sensor cook op-

eration. The cabinet should be installed and screws tightened.

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

condition and AS-l 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 cooling time.

If ERROR appears check sensor wire connections and/or AH sensor. NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first

stage of sensor cooking.

Page 20

R-8470 R-8570

TEST

PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT

TEST

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

water is boiling (bubling).

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

TESTING METHOD FOR

AH SENSOR

AND/OR CONTROL UNIT

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

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

follows: 6-l. Touch SENSOR COOK pad and number 1 pad.

6-2. Touch Start pad. The contorol panel is in the automatic Sensor operation. 6-3. The oven will turn off automatically when the water is boiling (bubling).

If new sensor dose not operate propaly, the problem is with the contorol unit.

THERMISTOR

TEST

Disconnect the connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-l and E-2.

Room Temp.

Resistance

68 “F(20

“C) -

86 “F(30

“C) 1

Approx. 350 f2 - 155k

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

DAMPER MOTOR

TEST

When the power cord is plugged into the wall receptacle, the 240 volts A.C. is supplied to the damper motor and 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 input voltage by A.C. volt-meter at the motor.

1. Disconnect the power cord from the wall receptacle.

2. Disconnect the wire loads 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 relay unit.

DAMPER SWITCH

TEST

Disconnect the wire leads from the switch terminals and connect the ohmmeter leads to the

common (COM and normaly open (NO) terminal 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 rotates. The switch

actuater

is released and meter sould indicate an open circuit.

If improper operation is indicated, replace the damper switch.

Page 21

R-8470 R-8570

TEST

PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT

TEST

CHECKING TEMPERATURE IN

THE

CONVECTION MODE

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

type temperature meter must be used.

A low priced bi-metal type thermometer is not reliable or

accurate.

The temperature should be checked approximately 5 minutes after the preheat temperature is

reached (audible signal sounds four times). The temperature experienced may be approximately 20 “C more or less than indicated on the display, however, in most cases the food cooking results will be satisfactory.

Difference in power supply voltage will also affect the oven temperature, The household power supply voltage may sometimes become lower than the rated voltage ( 240 ) and cause under-cooking. If the power supply voltage is 10% lower than the rated voltage, longer cooking

time is required by 10% to 20%.

Page 22

R-8470 R-8570

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following

units as shown in the block diagram. (1) Control Unit (2) Key Unit (3) Relay Unit

Exchange of signals between each unit is indicated by

the arrows in the block diagram. The principal func-

tions of these units and the signal communicated among them are explained below.

Relay

Unit

Relay unit consists of six relays (RYI -RY6), power

source circuit and buzzer circuit.

Key Unit

The key unit is composed of a matrix, signals generated

in the LSI are sent to the key unit through

E7,E8,

El 1 -El 3and El 5-E17. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through

AN4-AN7

to perform the function that was

requested.

Control Unit

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

LSI

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

Power

Source

Circuit

This circuit generates voltage necessary in the

control unit. Symbol Voltage Application

-5v

LSI

(ICI), ACL circuit and tem-

perature measurement circuit

-15v Buzzzer circuit and IC2

+0.5v

IC2 (R-8570 only)

-34v Fluorescent display tube : Grid and anode voltage

VFI

-25V Filament of fluorescent display tube

VF2

-28V

VFI - VF2 voltage

Synchronizing Signal Circuit

The power source synchronizing signal is available

in order to compose a basic standard time in the

clock circuit.

It accompanies a very small error because it works on commercial frequency.

ACL

Circuit

Cirucit to generate signals resetting the LSI to the initial state when power is supplied.

Buzzer

Circuit

The buzzer is responsive to signals from the LSI to emit noticing sounds (key touch sound and

completion sound).

Temperature

Measurement Circuit:

Oven

temp.

The temperature in the oven cavity is sensed by the thermistor. The variation of resistance according to sensed temperature is detected by the temperature meas-

urement circuit and the result applied to LSI. The result of detecting is given to LSI controlling the relay and display.

Absolute Humidity

Sensor

Circuit (R-8570

only)

The circuit detects absolute humidity of a food

which is under cooking, to allow its automatic

cooking.

Stop Switch

Go;w$h

to “tell” the LSI if the door is open or

Relay’Circuit

To drive the magnetron, heating element, fan motor, convection motor,damper motor, turntable

motor and light the oven lamp.

10)

Indicator Circuit

Indicator element is a Fluorescent Display.

Basicalloy, 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 7-digits, 15-segments are

used for displaying figures.

Page 23

-8470

-8570

Figure T-l. Block Daigram

I I

Page 24

R-8470

-8.570

LSI (

1X2429)

The I/O

signa

I of the LSl(lX2429) is detailed in the following table.

DESCRIPTION OF LSI

PIN NO.

l-6

SIGNAL / EO-E5

I/O

OUT

Dinit selection sianal.

Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display.

PIN NO. ) 7

SIGNAL j E6

I/O

OUT

Seqment data

signals.

Refer to the touch control panel circuit about the relation between signls and indicators. Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display.

PIN NO. j 8

Segment data skmal.

Signal similar to E6.

Kev strobe siqnal.

SIGNAL / E7

I/O

(

OUT

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-2 line keys on key matrix is touched.

PIN NO. / 9

Segment data sianal.

Signal similar to E6.

SIGNAL / E8

I/O

OUT

Kev strobe siqnal.( R-8570 onlv)

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-3 line keys on key matrix is touched.

PIN NO. j

IO,11

Segment data siqnal.

Signal similar to E6.

SIGNAL /

E9,ElO

I/O

OUT

PIN NO. / 12

SIGNAL ( El1

I/O

OUT

Segment data siqnal.

Signal similar to E6.

Kev strobe siqnal.

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-4 line keys on key matrix is touched.

PIN NO. ) 13

Segment data siqnal.

Signal similar to

E6.

Kev strobe signal.

SIGNAL j El2

I/O

OUT

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-5 line keys on key matrix is touched.

PIN NO. / 14

SIGNAL

El3

I/O

OUT

Seqment data sknal.

Signal similar to E6.

Kev strobe siwal.

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-6 line keys on key matrix is touched,

Page 25

R-8470 R-8570

PIN NO. / 15

SIGNAL /El4

I/O

1 OUT

Seqment

data siqnal.

Signal similar to E6.

PIN NO. / 16

SIGNAL

El5

I/O

OUT

Seqment

data siqnal.

Signal similar to E6.

Key strobe

siqnal.

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-7 line keys on key matrix is touched.

PINNO. /

Seqment

data siqnal.

Signal similar to E6.

Kev strobe

siqnal.

SIGNAL j El6

I/O

(

OUT

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

terminal while one of G-8 line keys on key matrix is touched.

PIN NO. / 18

SIGNAL / El7

I/O

OUT

Seqment data

siqnal.

Signal similar to E6.

Kev strobe

siqnal.

Signal applied to touch-key section. A pulse signal is input to

AN4-AN7

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

PIN NO.

19,20

SIGNAL 1

El8,E19

l/O

OUT

Seqment data

siqnal.

Signal similar to E6.

PIN NO.

21-24

SIGNAL /E20-

E23

I/O

OUT

R-8470: Terminal not used. Connected to GND.

R-8570:

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

PIN NO. / 25

SIGNAL 1 EX

I/O

Internal

clock

oscillation frequency settinq input.

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

PIN NO. /

,26

SIGNAL / X

l/O

OUT

tnternal

clock

oscillation frequency control output.

Output to control oscillation

inpout

of EX.

PIN NO. / 27

Auto clear terminal.

SIGNAL

RESET

I/O

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

PIN NO.

1 28

Segment

data siqnal.

Signal similar to E6.

SIGNAL / SO E24

I/O

OUT

Page 26

q-8470 q-8570

PIN NO. 29

SIGNAL / SI E25

I/O

OUT

R-8470: Terminal not used. R-8570: Used for initial balancing of the bridge circuit(absolute himidity sensor).

NO. ( 30

SIGNAL (E26

I/O / OUT

Signal to sound buzzer.

A: Key touch sound.(0.12 sec.) B: Completion sound. (2.4 sec.) C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the

preheating hold time (15 minutes) is elapsed. (1.2 sec. ON-l .2 sec. OFF repeat)

PIN NO. 31

SIGNAL / IRQ E27

I/O

Signal synchronized

with commercial source frequencv(50Hz).

This is the basic timing for time processing of LSI.

PIN NO. / 32

SIGNAL 1 Vss

Power

source

voltage: -5V.

VC voltage of power source circuit input.

I/O

PIN NO. / 33

SIGNAL / RO

Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay.

l/O

OUT

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.

PIN NO. j 34

SIGNAL 1 RI

I/O

OUT

Oven lamp

and turntable motor driving signal.(Sauare Waveform:50Hz)

To turn on and off the control relay. The pulse signai(50Hz) is delivered to the control relay driving circuit and cook relay and heater relay control circuit.

PIN NO. / 35

SIGNAL j R2

l/O

OUT

Heating element driving siqnal.

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

PIN NO. 1 36

SIGNAL ( R3

l/O

OUT

Cooling fan

motor driving signal.

To turn on and off the cooling fan motor relay.

“L” level during both microwave and convection cooking; “H” level

otherwise.

PIN NO. j 37

SIGNAL / R4

I/O

OUT

Convection motor driving signal.

To turn on and off the convection motor.

“L” level during CONVECTION or MIX COOK; “H” level otherwise.

Page 27

R-8470 R-8570

PIN NO.

1 38

SIGNAL / R5

Damper motor relav driving

signal.

To turn on and off the damper motor relay.

I/O

OUT

PIN NO. / 39

-Digit selection

signal.

Signal similar to EO.

SIGNAL j R6

I/O

OUT

PIN NO.1 40

SIGNAL 1 R7

I/O

Input

signal

which communicates the damper open/close information to LSI.

Damper opened; “H” level signal. Damper closed; “L” level signal.

PIN NO.

SIGNAL / E37

I/O

Terminal to

change

functions according to the model.

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

PIN NO. / 42

SIGNAL / E36

I/O

Input

signal

which communicates the door open/close information to

LSI.

Door closed; “H” level signal. Door opened;

“L” level signal.

PIN NO. / 43 Connected to VC.

SIGNAL /AVss

I/O

PIN NO. / 44

SIGNAL 1 AVR-

Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintained at -5V.

I/O

PIN NO. / 45

SIGNAL

AVR+

I/O

Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI.

Connectd to GND.

PIN NO. 1 46 Connected to GND.

SIGNAL jAVcc

I/O

PIN NO. ( 47

SIGNAL / AN7

l/O

Signal

coming from touch

key.

When either one of G-l 3 line keys on key matrix is touched, a corresponding signal out of

E7,E8,Ell

-El 3 and

5-El7

will be input into AN7.

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

PIN NO. / 48

SIGNAL / AN6

I/O

Signal coming from touch

key.

When either one of G-12 line keys on key matrix is touched, a corresponding signal will be input into AN6.

PIN NO.

1 49

SIGNAL / AN5

I/O

Signal coming from touch

kev.

When either one of G-l 1 line keys on key matrix is touched, a corresponding signal will be input into AN5.

PIN NO. / 50

SIGNAL j AN4

I/O

Signal cominQ

from touch

key.

When either one of G-10 line keys on key matrix is touched, a corresponding signal will be input into AN4.

Page 28

-8470

R-8570

PIN NO. / 51

SIGNAL

AN3

I/O 1 IN

R-8470:

Terminal not used. No connection.

R-8570: Used for initial balancing of the bridge circuit (absolute humidity sensor).

This input is an analog input terminal from the AH sensor

circuitand

connected to the A/D converter built into the

LSI.

PIN NO. j 52 R-8470:

SIGNAL / AN2

I/O

Terminal not used. No connection.

R-8570:

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.

PIN NO. / 53

SIGNAL j AN1

I/O

Temperature measurement input: OVEN THERMISTOR.

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

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

PIN NO. 1 54

SIGNAL

AN0

I/O

(

Terminal not used. Connected to GND.

PIN NO. 55

SIGNAL / R8

Terminal not used. Connected to VC.

I/O

OUT

PIN NO. / 56-60

Terminal not used.

SIGNAL 1R9-RI3

I/O

PIN NO. 1 61

SIGNAL i

RI4

Terminal not used. Connected to GND.

I/O

PIN NO. j 62

SIGNAL /

RI5

I/O

Terminal for manufacture test.

Normally connected to VC.

PIN NO. 1 63

SIGNAL ( NC

Terminal not used. Connected to GND.

I/O

PIN NO. ) 64 Connected to GN D.

SIGNAL 1 Vcc

I/O

Page 29

-8470

R-8570

ABSOLUTE HUMIDITY SENSOR CIRCUIT (R-8570

only)

(1)

Structure of Absolute Humidity

Sensor

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

Internal Structure of

Sfmsor

Operational Principle of Absolute Humidity Sensor

The figer below shows the basic structure of an absolute humidity sensor.

A bridge circuit is

fromed

by two thermistors and two resistors (RI and R2). The output of the bridge circuit is to be amplified by the operational amplifier.

Each thermister is supplied with a current to keep

itself heated at about 150 “C (302 “F) and 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

condutivity

leading to 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 will be amplified by the

operational amplifier.

Absolute humidity (g/m’ J

(3) Detector Circuite of Absolute Humidity

Sensor

Circuit

This detector circuit is used to detect the output voltage of the a 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, 16 seconds later the detector circuit starts to function and the LSI observes the initial voltage availabel at its AN2 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are

turned on in such a way as to change the resistance values in parallel with R50.

-1,

Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and AN3 terminal of the

LSI.

The voltage of AN2 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 AN2 terminal of the LSI. Then the LSI observes that voltage at AN2 terminal and

compares it with its initial value, and when the comparison rate reaches the prest value (fixed for each menu to be cooked), the LSI causes the unit to stop the sensor cooking; thereafter, the unit gets in the next necessary operation automatically.

When the LSI starts to detect the initial voltage at

AN2 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is impossible to take a balance of the bridge circuit due to disconnection of the absolute humidity sensor, ER-

ROR will reappear on the display and the cooking is stopped.

1 )Absolute humidity sensor circuit

n.rm.4e In

CIDwd “.,..I

s Thwm**(or

I”

opn “.SH,

. .

-51,

.p-r

wo-?I,

2)lnternal equivalent circuit of

Top View

-)2 +I2

Page 30

A -8470

-8570

SERVICING

Precautions for Handing Electronic

Components

This unit uses PMOS LSI in the integral part of the

circuits. When handing 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 charged in clothes, etc,and sometimes it is not fully protected by the

built-in protection circuit.

In order to protect PMOS LSI.

1) When storing and transporting, throughly wrap them in aluminum foil. Also wrap PW boards containing them in aluminium foil.

2) When soldering,

ground the technician as shown in the figure and use grounded soldering iron and work table.

2. Servicing of

Touch

Control

Panel

We describe the procedures to permit servicing the touch control panel of the microwave oven and the cautions you must consider when doing so. To carry the servicing, power supply to the touch control panel is available either from the power line of the oven proper itself of from an external power source.

(1) Servicing the touch control

panel

with

power

supply

from the

oven proper:

CAUTION:

THE

HIGH VOLTAGE TRANSFORMER

THE

MICROWAVE

OVEN IS STILL

ALIVE

TO GIVE

YOU

DANGER DURING

SER-

VICING.

Therefore, when checking the performance of the touch control panel,put the outer cabinet on the oven proper to keep you from touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; and 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

proper is so short that they can’t be separated

from each other.

For those models, therefore, check and repair all the controls (with the sensor-related ones included) of the touch control panel while keeping it in contact with the oven proper.

On some models, on the other hand, the power supply cord between the touch control panel and the oven proper is so long that they may

be separated from each other. For those models, therefore, it is allowed to check and repair the controls of the touch control panel while

keeping it apart from the oven proper;in this

case you must short both ends of the stop switch (on PWB) of the touch control panel

with a jumper, which brings about an opera-

tional state that is equivalent to that with the

oven door being closed.

As to the sensor-related controls of the touch

control panel, their checking is allowed if the

dummy resistor(s) whose resistance is equal to

that of those controls is 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 such an operational

state that is equivalent that with the oven door

being closed. And connect an external power source to the power input terminal of the touch

control panel, and then it is allowed to check

and repair the controls of the touch control

panel;as

in the case of (1 )-B above, it is here

also possible to check the sensor-related controls of the touch control panel by using the

dummy resistor(s).

Serivicing

Tools

Tools required when serivicing the touch control panel assembly.

1) Soldering:

3ow

(To prevent leaking current, it is recommended to

use a soldering iron with grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC -

IOMHz

type or more ad-

vanced model.

3) Others:

Other tools

Other Precautions

1) When turning on the power source of the con-

trol unit, remove the aluminum foil applied for

preventing static electricity.

2) Connect the connectors of the indicator and

key units to the control unit taking care that the lead wires are not twisted.

After aluminum foil is removed, take extra care

that abnormal voltage due to static electricity

etc. is not applied to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc.

to PWB, taking care that all connections are tight.

5) Be sure to use specified components where

high precision is required.

Page 31

R-8470 R-8570

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: TO AVOID POSSIBLE EXPOSURE TO

3. THE DOOR IS BENT OR WARPED.

MICROWAVE ENERGY;

4. THERE IS ANY DEFECTIVE PARTS IN THE

BEFORE OPERATING THE OVEN

INTERLOCK, OVEN DOOR OR MICROWAVE

1. MAKE SURE THAT UNLATCHING THE DOOR

GENERATING AND TRANSMISSION AS-

SLOWLY IS ACCOMPANIED BY A CLICK IN-

SEMBLY.

DICATING ACTUATION OF THE MONITOR

5. THERE IS ANY OTHER VISIBLE DAMAGE TO

SWITCH AND LATCH SWITCH.

THE OVEN.

2. CHECK VISUALLY THE DOOR SEAL FOR

C. DO NOT OPERATE THE OVEN

ARCING AND DAMAGE.

1. WITHOUT THE RF GASKET.

DO NOT OPERATE THE OVEN UNTIL AFTER RE-

2. IF THE DOOR IS NOT CLOSED.

PAIR IF ANY OF THE FOLLOWING C ONDITIONS

CAUTION: DISCONNECT THE OVEN FROM THE

EXIST;

POWER SUPPLY BEFORE REMOV-

1. DOOR DOES NOT CLOSE FIRMLY AGAINST

ING OUTER CASE. DISCHARGE THE

THE FRONT OF APPLIANCE.

HIGH VOLTAGE CAPACITOR BE-

2. THERE IS A BROKEN DOOR HINGE OR

FORE TOUCHING ANY OVEN COM-

SUPPORT.

PONENTS OR WIRING.

POWER TRANSFORMER REMOVAL

Disconnect oven from power supply and remove

outer case.

Discharge high voltage capacitor. Disconnect filament leads of transformer from the

magnetron.

Disconnect wire leads from the transformer. Remove two (2) screws holding the transformer to

the cabinet base.

Re-install

Rest the transformer on the base cabinet with its primary terminals toward. Insert the two edges of the transformer into two metal tabs of the base cabinet.

Make sure the transformer is mounted correctly to the corners underneath those tabs After re-installing the transformer, secure the transformer with two screws to the cabinet base, one is with outertooth washer and the other is without outer-tooth washer.

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

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

SILICON RECTIFIER REMOVAL

Disconnect oven from power suppply and remove

4. Disconnect the rectifier from the capacitor.

outer case.

CAUTION: WHEN REPLACING THE SILICON

Discharge the high voltage capacitor.

RECTIFIER, THE GROUND SIDE TER-

Remove single (1) screw holding the rectifier to the

MINAL MUST BE SECURED FIRMLY

capacitor holder.

WITH A GROUNDING SCREW.

HIGH VOLTAGE CAPACITOR REMOVAL

Disconnect oven from power supply and remove

outer case.

Discharge the high voltage capacitor. Disconnect wire leads and rectifier from the

capacitor.

4. Remove single (1) screw holding the capacitor holder to the rear cabinet using a special screw-driver.

5. Remove the capacitor holder with capacitor and rectifier attached.

6. Remove the capacitor from the holder.

TURNTABLE MOTOR AND/OR COUPLING REMOVAL

Disconnect the oven from power supply. Remove single (1) screw holding the turntable

motor cover to the base cabinet and remove it.

Disconnect 2-pin connector from the turntable mo-

tor.

Remove the three (3) screws holding the turntable motor assembly to the oven cavity bottom and remove it.

5. Remove the two (2) screws holding the turntable motor to the mounting plate.

6. The turntable motor is now free.

7. After removal of the turntable motor assembly, re-

move the ring and washer holding the turntable

coupling to the oven cavity bottom.

8. The turntable coupling is now free.

Page 32

R-8470 R-8570

MAGNETRON ASSEMBLY REMOVAL

Disconnect oven from power supply and remove

6. Lower the magnetron assembly until the tube is

outer case.

clear of the waveguide.

2. Discharge the high voltage capacitor.

7. Remove single (1) screw holding the cooling duct

3. Disconnect wire leads from the magnetron

assem-

(B) to the magnetron assembly.

bly.

8. Remove the cooling duct (B) from the magnetron.

4. Release the tab which is provided on cooling duct

CAUTION:

WHEN REPLACING THE MAGNETRON,

(B) to hold cooling duct (A).

BE SURE THE R.F. GASKET IS IN

5. Carefully remove four (4) mounting screws holding

PLACE

AND

THE

MAGNETRON

the magnetron assembly to waveguide while sup-

MOUNTING SCREWS ARE TIGHTENED

porting the magnetron assembly from below.

SECURELY.

CONVECTION MOTOR REMOVAL

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

2. Disharge the high voltage capacitor.

3. Disconnect wire leads from the convection motor.

4. Remove two (2) screw holding the convection motor assembly to the chassis support and waveguide flange.

The convection motor assembly is now free.

7. Remove the two (2) screw and nuts holding the mounting bracket to the motor

8. Remove the pin and pulley (B) from the motor shaft.

5. Remove the convection fan belt.

6. Lift up the convection motor assembly and remove it from the unit.

9. The convection motor is now free. Note: The motor mounting plate with the convection

motor should be installed in close contact with the waveguide flange. Otherwise, the revolution of the convection fan belt may be disrupted.

COOLING FAN

MOTOR REMOVAL

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

7. Remove the duct (A) with the cooling fan motor attached from the unit.

2. Discharge the high voltage capacitor.

3. Disconnect wire leads from the cooling fan motor.

4. Remove screw holding the grounding wire to the oven cavity flange.

5. Remove four (4) screw holding the chassis support to rear cabinet, cooling duct (A), convection motor mounting plate and control panel back plate.

6. Release the tab which is provided on

(B) to hold the cooling duct (A).

cooling duct

The cooling fan motor assembly is now free.

8. Remove the fan blade from the cooling fan motor shaft by pulling the fan retainer clip.

9. Remove two (2) screws and nuts holding the cooling fan motor and grounding wire to the cool-

ing duct (A).

The cooling fan motor is now free.

1. Disconnect oven from power supply outer case.

and remove

2. Discharge the high voltage capacitor.

3. Remove the magnetron assembly, refer to “Magnetron Assembly Removal”.

4. Disconnect two (2) connectors for the damper motor from the relay unit.

5. Disconnect two (2) connectors for the stop switch from the relay unit.

DAPMER ASSEMBLY

6. Remove two (2) screw holding the damper duct to oven cavity right-side.

7. Remove single (1) screw holding the damper duct

to rear cabinet.

8. Remove two (2) screws holding the damper duct to top of the oven cavity.

9. Remove the damper assembly from the unit.

Page 33

R-8470 R-8570

\ 1.

HEATEING ELEMENT OR CONVECTION FAN REMOVAL

Disconnect oven from power supply and remove

outer case

Discharge high voltagecapacitor. Remove the cooling fan motor assembly and con-

vection motor assembly.

Disconnect wire leads from the heating element and

thermistor.

For R-8570, remove the five (5) screws holding the

sensor cover to the steam duct (A).

Remove single (1) screw holding the steam duct

(D), and remove it.

Remove three (3) screws holding the thermal protection cover to thermal protection plate (A) and steam (A).

Release the tab holding the steam duct (C) and remove the two (2) screws holding the steam duct

lO.Remove screw and nut holding the steam duct (B),

and remove it.

11 .Lift up thermal protection plate (D) and protection

sheet (D) together.

12.Remove six (6) screws and nuts holding the convection air gudie (A) , and slide it rightward for re-

move it.

The convection air guide (A) assembly is now free.

Replacement of individual components is as follows.

HEATING ELEMENT

1. Remove two (2) screws holding the convection air

guide (D) to convection air guide (A).

2. Remove two (2) screws holding the heating ele-

ment to convection air guide (A).

3. Remove the heating element.

(A) to the oven cavity flange. Remove the thermal protection plate (E).

CONVECTION FAN

Remove two (2) screws holding the air guide (A)

1. Remove the nut, washer and pin.

and remove it.

2. Pull the fan from the fan shaft.

CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

The complete control panel should be removed for re-

placement of components except the relay unit.

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 the wire connectors and wire leads from

the relay unit.

Disconnect a connector from the control unit. Remove single (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 single (1) screw holding the back plate to

the oven cavity flange.

Lift up and pull the control panel forward.

Disconnect the wire connector of control unit from

the relay 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 three (3) 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.

UPPER/LOWER LATCH SWITCHES AND MONITOR SWITCH REMOVAL

Disconnect the oven from the power supply and

remove the outer case.

Discharge the high voltage capacitor. Disconnect the wire leads from the switch (es).

Remove the one (1) screw holding the upper latch hook to the oven caity front flange and remove the

one (1) screw holding the lower latch hook to the

oven caity front flange.

Remove the latch hook from the flange by moving it downward.

To remove the individual switch from the latch

4. hookes, push outward the two (2) retaining tabs holding the switch in place.

The switch is now free.

Re-install Re-install each latch switch and monitor switch its

place.

Re-connect the wire leads to each switch. Refer to chapter “Pictorial Diagram”. Secure the individual latch hook with the one (1) mounting screw to the oven cavity front flange.

Make sure that the monitor switch is operating properly. Refer to chapter “Test Procedure”, and the Adjustment procedure below.

Page 34

UPPER/LOWER LATCH SWITCHES AND MONITOR SWITCH ADJUSTMENT

If the upper and lower latch switches and monitor switch do not operate properly due to a mis-adjustment, the following adjustment should be made.

1. Loosen the one (1) screw holding the upper latch hook to the oven cavity front flange and the one (1) screw holding the lower latch hook to the same

flange.

2. With the door closed, adjust the lower latch hook by moving it back and forward and then adjust the upper latch hook by moving it back and forward, or up and down. In and out play of the door allowed by the upper and lower latch hooks should be less than 0.5 mm. The vertical position of the upper latch hook should be placed where the upper latch switch and monitor switch have activated with the door closed. Vertical adjustment of the lower

latch hook is not possible.

3. Secure the screws with washers firmly.

4. Now, make sure of the upper latch switch operation. If the upper latch switch has not activated with the door closed, loose the one (1) screw holding

the upper latch hook to the oven cavity front flange

and adjust the upper latch hook position.

After the adjustment, make sure of the following

points:

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

0.5 mm at latched position. First check the upper latch hook position, pushing and pulling the upper portion of door toward the oven face. Then check the lower latch hook position, pushing and pulling the lower portion of door toward the oven face.

Both results (plays of the door) should be less than

0.5mm.

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

3. The monitor switch contacts close when the door

is opened.

4. Re-install the outer case and check for microwave

leakage around the door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Figure C-l.

Latch

Switches Adjustment

Page 35

R-8470 R-8570

DOOR REPLACEMENT AND ADJUSTMENT

DOOR REPLACEMENT

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

2. Holding the door, remove four (4) screws securing the door hinge to the oven cavity. The door assembly is nowfree from the oven cavity.

3. On re-installing new door assembly, secure the door assembly with the four (4) mounting screws to the oven cavity.

Make sure the door is parallel with the bottom line of the oven face plate and the latch heads pass through the latch holes correctly.

Note: After any service to the door, an approved

microwave survey meter should be used to as-

sure

compliance with proper

microwave rediation standard. (Refer to Microwave Measurement Procedure).

Note: If the Latch Heads Removal, “TORX T-20” or

“LHXTIX LR-3” Type screwdriver should be used.

TORX screw

HINGE MOUNTING PLATE

OOOR ASSEMBL

TORX SCREW (T-20)

LATCH HEADS

DOOR ADJUSTMENT When removing and/or loosening hinge such as in the case of a door replacement, the following adjustment criteria are taken. Door is adjusted to meet the fol-

lowing three conditions before tightening the hinge screws.

1. Adjust door latch heads at a position where they smoothly catch the latch hooks through the latch holes. Refer to primary and secondary interlock switches adjustment.

2. Deviation of the door alignment from the horizontal line of cavity face to be less than IOmm.

3. Door should be adjusted with its face depressed toward cavity face.

After hinge screws are tightened under foregoing con-

ditions, recheck 1 and 2.

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 :~t&co;~eycledo~rhis function does not require

airtight, moisture) condensationg-tight or light-tight. Therefore, the occasional appearance of moisture, light or the sensing of gentle 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 exhaut the vapor-laden air from the oven cavity.

OUTER CASE CABINET

OVEN FACE PLATE

Figure C-2. Door Assembly Replacement and Adjustment

Page 36

R-8470 R-8570

MICROWAVE MEASUREMENT

After the adjustment of the 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

THE

TESTING:

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

Make

surethat

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

Recommended instruments are: NARDA 8100 NARDA 8200 HOLDADYA HI 1500 SIMPSON 3800M

2. Place the turntabel tray into the oven cavity.

3. Place the load of 275

fl5ml

of water initially at 20 +5 “C in the centre of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx.

8.5cm

and made of an electrically non-conductive material such as glass or plastic.

The placing of this standard load in the oven is im-

portant not only to protect the oven, but also to in-

sure that ny leakage is measured accurately.

4. Close the door and turn the oven ON with the timer set for several minutes. If the water begins to boil

before the survey is completed, replace it with 275ml of the cool water.

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

6. The microwave radiation emission should be meas-

ured at any point of 5cm or more from the external

surface of the oven.

Page 37

R-8470 R-8570

PACKING AND ACCESSORIES

TRAY PACKING FOAM

s (SPADP0328WREO)

Not

Replaceble

Items

Page 38

I---

--_.- -

-- _--

-. s:

2. GL

CN-I

101

I 3 ,618

N-A

CN-BI

lCN-@ii

COOLING FANMOTOR

W-Ii-

(R-857

-. -

rAt C I

I c

CONTROL

PANEL

ASS’Y

TO 3PIN CONNECTOR CN-F

THERMISTOR

HEATING ELEMENT

ION

,ZP,N

CONNECTOR

(Al

1L ;----- _ o-.--~--

__ -

bin

.-.-

~__--

_--_--

____

~__

___~~~---.

Page 39

R-8470

R -8470

R-8570

AC240V

50Hz

IN)

J-

fRS1,

r-l

I \-?

22pH

iI=

lY7479

ZD2

c30

Q30 DTA143 A

C81

3.3lJ/5ov

‘I

VI-

TURNTABLE

MOTOR

OVEN LAMP

r4~yB..4$IDT

FAN MOTOR A-9

dc-aC

A-7

A-5

fN;;CTlON

DAMPER MOTOR

DTA143 A x5

IF NOT SPECIFIED,1/4W 5%

-j + I’F

NOT SPECIFIED,

0.015~~ 25V

IF NOT SPECIFIED, US1060

R76 lk

R71

R66 lk

fvc

R65 130 F

C65

l-7

DAMPER

STOP SWITCH

SWITCH

(DOOR SWITCH)

TERMISTER

Figure S-2. Contorol Panel Circuit (Mot

3 4

5 6

Page 40

R-8470 R-8470 R-8570 R-8570

R66

R65

130 F

C65

!-+T

KEY UNIT

10k

j-t??+

jR99 fR96 +

R97

+R96 +R95 fR94

fR9l r;;

'U &OS-

ln0V.l

CC.

OVEN

TERMISTER

I Panel Circuit (Model R-8470)

Page 41

R-8470

R-8570

AC240

5Ok

TURNTABLE

MOTOR

OVEN LAMP

POWER TRANSFORMER

;&IIf&)AKt

HEATING

ELEMENT

FAN

MOT01

c$IUU;CTION

DAMPER

MOTOF

DTA143 A x!

IF NOT SPECIFIED,1/4W 5%

4 b

IF NOT SPECIFIED,

0.015~

25V

IF NOT SPECIFIED, US1060

R76 lk

R75

27k

R52

i.BkF

%KfT

STOP OVEN

THERMISTOR

~DO%%#TC”,

Figure S-3

Page 42

R-8470

-8570

NAL

D91

10k

HIGH MEDHIGH

AUTO s~,im

STOP INSTANT TIMER

START

HOLD DEFROST

(KEY UNIT

]

-I

SENSOR

11 Panel

Circuit

(Model

R-8570)

Page 43

R-8470 R -8570

__--- ~-

_ _--

BFI

[--‘CSO’ m R90 6

q11 -lp -

liar

I)rt--9’0looe4 $

:: 01

~lOlOl,K E:%’

I,,

ggzr:

Y7-O

Rmo

:f[f:

(Lx- I

:*71 I] r-J ggo

g pa3 &g f‘

’ 1 II----

‘I

$~&$:g;:j &;iti E 0,” ‘;ec!

‘g=&+-&

kn, L! 0;

0’: ’

‘4

I gj zm 52

1 *i$yfycJ~~,3

a-.-Ad%

53 g ’ a g a

“Fz

i-Li._.‘.z”

mR*r-

IIAFI

. --

_ I

0184

(Control

Unit)

Figure S-4. Printed Wiring Board

(Relay Unit)

3 4

5 6

Page 44

PARTS LIST

QACCA0032WREO

Mains supply cord

I- 2

QFS- CQOOl

YBEO

Fuse (Ml OA)

I- 3

QFSHDOOl

9WREO

Fuse holder

QSW- MO1 71 WREO

Upper latch switch (V-l

6G-1

C25)

I- 5

QSW-

MO1

73WRE0

Lower latch switch (V-l

6G-3C25)

QSW- MO1 72WRE0

Monitor switch (V-l

6G-2C25)

I- 7

RLMPTOO38WREO

Oven lamp

QFS-

TOO26WREO

Temp. fuse

RMOTDA021 WREO

Turntable motor

l-10

RMOTEAOl

7WRE0 Fan motor

l-11

RMOTEA036WREO

Convection motor

1-12 .

RMOTDAOl

8WRE0

Damper motor

1-13

QSW- MO1 74WRE0

Stop switch and damper switch (V-5330DK)

1-14

RHET- A01 1 WREO Heating element

1-15

FH-

HZOO24WREO

Thermistor

l-16

RTRN-

0326WREO

Power transformer

1-17

RC-

QZOl

33WRE0

High voltage capacitor

1-18

RH-

DZOO56WREO

Rectifier

1-19

RH-

DZAOO2WREO

Short protector

l-20

RV-

MZAOO8WREO

Magnetron

I-21

RTRN-A013DREO

Transformer (for control unit)

l-22

FDTCTA034WRKO

AH sensor: R-8570 only

CABINET PARTS

9 2-10 2-l 1 2-12 2-l 3 2-l 4 2-l 5 2-16 2-l 7

FDAi

0237WRYO

Base cabinet (A)

DAi

AO38WRYO

Base cabinet (B)

GOVNROO89WRWO

Rear cabinet

GLEGP0009YBEO

Foot

TMAPCAl

53WRR0

Schematic diagram: R-8470

TMAPCAl 54WRR0

Schematic diagram: R-8570

LBNDK0035WRPO

Capacitor holder

PCUSU0242YBPO

Cushion

LHLDK0005YBFO

Cord holder

GCABUAO56WRPO

Outer case cabinet

PCUSUOl 12YBPO

Shading cushion (A)

LANGQ0255WRWO

Capacitor mounting bracket

PSPAGQ002YBEO

Vibration proof cushion

PCAS-

0017WRFO

Plug case

LANGQ0225WRWO

Cord mounting bracket

LBSHC0032WREO

Cord bushing

LSTPP0009YBFO

Cord anchorage (lower)

LSTPP0008YBFO

Cord anchorage (upper)

CONTROL PANEL PARTS

3- 1A 3- 16 3- 1c 3- 1D 3-

C3,C6

C5,C7,C20,

C31

,C65,

c70,

c75

c5,c7,

C20,

C31,

c51-

c53,

c70,

c75

Cl0

c30

CPWBF21 3SWRK0

Control unit: R-8470

CPWBF21 4SWRK0

Control unit: R-8570

QCNCMA034DREO

13-pin

connector (D)

QCNCMA040DREO

6-pin

connector (E)

QCNCMA039DREO

3-pin connector (F),(H): R-8570

QPLGJA002DREO

14-pin

connector (G)

QCNCMA047 DREO

2-pin connector (H): R-8470

RV-

KXA002DREO

Fluorescent display tube

RC-

EZA059DREO

Capacitor 10

RC-

EZAO61

DREO Capacitor

4.7

RC-

KZAOO4DREO

Capacitor

0.015

/-IF

25V 5ov 25V: R-8470

RC-

KZA004DREO

Capacitor 0.015

25V: R-8570

RC-

EZA057DREO

RC-

EZA058DREO

RC-

EZAOGODREO

Capacitor Capacitor Capacitor

100

16V 25V 16V

ELECTRICAL

PARTS

1 1 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1

1 1 4 1 1 1 1

1 1 1 1 1 1

1 1 1

2 1 7

1 1 1

AF AG AG AG AH AG

AW AW

AR AH

AQ AQ

Page 45

* *

* * *

* A

* *

1 1 $I + 1

4 * *

9 * *

* *

* * *

R-8470 R-8570

Note

: The voltage supplied to the parts marked

U*N

is greater than

25OV.

* :

Refer to “REPLACEMENT PARTS LIST” described at after page.

REF.

NO.

PART NO.

DESCRIPTION

Q’TY 1 CODE

c50 C80 C81

CFl

D7,D20,

DBO-

D83,

D91, D94- D99,

D105

D7,DlO,

D20,D51,

D52,

D81-

D83,

D91

,D92, D94- D99, D105

D8,D9 DB,D9,DlO

ICl IC2 Ql 030,Q41,

Ql 00

Q50,081,

Q83-Q86 Q80 Q81,

Q83-086 082 Rl

R2 R3 R4 R22, R82,

R201

,R203

R22,R54,

R82, R203

R23,R31,

R202 R30 R50 R51

R55,R81,

R91,

R92,

R94- R103

R65

R66,

R71,

R76,

R80

R66,R71,

R76,

R80,

R201 R67 R70, R75,

Rlll

R81,

R91,

R94-R103

R83 R84

R90

RllO

Rll2

R113 R200 R204

ZDl

ZD2 ZD30

RC-

KZl

04QDRE0

RC-

EZAO63DREO

RC-

EZA062DREO

RCRS-

A003DREO

RH-

DZA002DREO

RH-

DZA002DREO

Diode (US1 060): R-8570

17 AA

RH- DZAOl 1 DREO RH- DZAOl 1 DREO

RH- i

X2429DREO

RH- i ZOO21 WREO RH-

TZ0029DREO

RH- TZA042 DREO

Diode (11 ES1 ): R-8470

FEde (11ESl):

R-8570

IC (lR94558): R-8570 only

Transistor

(2s B953Q,

Transistor

(DTAl43E.S)

3 AB 1

RH-

TZA022DREO

Transistor (

DTAl43A):

R-8570

6 AB

RH-TZA025DREO

RH-

TZA022DREO

Transistor

(2SC2021 MQ,R,S)

Transistor

(DTAl43A):

R-8470

1 5

1 1 1 1 1 4

1 1 1

1 4

1 3

1 1 1 1 1 1 1 1

1 1 1

AB AB

RH- TZA021 DREO

RR- DZ331 NDREO

RR-

DZl

51 PDREO

RR-

DZl

21 PDREO

RR- DZ271 PDREO

RR-

DZ473DDREO

AC AA AA AA AA AA

RR-

DZ473DDREO

Transistor

(2SB91

OMR)

Resistor 330

Resistor

150

Resistor

120n

Resistor 270

Resistor 47k

Resistor

15kn

Resistor 470

Resistor block

(RNAFST)

Resistor

330

Resistor

IOkn

1/4w 1/2w lj2W 1/2w 1/4W:

R-8470

1/4W:

R-8570 AA

RR-

DZl

53DDRECI

l4W

RR- DZ471 NDREO

RR-

DZA005DREO

RR- DZ331 PDREO

RR-

DZl

03DDRE0

1/4w

1/2w 1/4W:

R-8570

AA AA AA AA

RR-

NZl

31 NDREO

RR-

DZI

02DDRE0

RR-

DZl

02DDRE0

RR-

NZ5,02NDREO

RR-

DZ273NDREO

RR-

DZI

03DDRE0

RR-

DZ472+

kE0

RR- DZ222 DREO RR-

DZA029DREO

RR-

DZA027DREO

RR-

DZA028DREO

RR-

DZ563NDREO

RR-

DZ204DDREO

RR-

02201

NDREO

RH-

EZA050DREO

RH- EZA051 DREO RH-

EZA052DREO

Capacitor

0.1

Capacitor

0.47

/JF

Capacitor

3.3

Ceramic filter

(4.0MHz)

Diode (US1 060): R-8470

25V: R-8570 25V

5ov

Resistor

130

R(F)

Resistor

lkfi

Resistor

lkn

Resistor

n(F)

Resistor 27k

Resistor

10kn

Resistor

4.7k n

Resistor

2.2k n

Resistor block (1

OOk nx4)

Resistor block (27k

nx6)

Resistor block (56k

nxl4)

Resistor 56k

Resistor

200k

Resistor

200

Zener diode

(RD16EB3)

Zener diode (RD5.1 EB3) Zener diode

(RD3.6EL2)

1/4w 1/4W:

R-8470

ll4W:

R-8570

1/4w ll4W

1/4W:

R-8470

1/4w 1/4w

ll4W

1/4w

1 l4W: R-8570 only

14 AA

AA AA

AA AB AC AD AA AA AA

A0 A0

Page 46

-8470

-8570

Note : The voltage supplied to the parts marked ‘I*” is greater than

25OV.

Refer to “REPLACEMENT PARTS LIST” described at after page.

REF. NO.1

PART NO.

DESCRIPTION

Q’TY 1 CODE

3-2

.=c

3- 20 3-

Cl c2

Cl 80

Dl -D5

D84,

D181-D186

:40 R20

R21

,R42

R40 R41

RYl -

RY6

SP40

VRSl

9 4-l 0 4-l 1 4-l 2 4-l 3 4-14 4-l 5 4-l 6 4-l 7 4-l 8 4-l 9

4-20 4-21 4-22 4-23 4-24 4-25 4-26

4-27

4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40

4-41

-FPWBFAO62WREO QPLGJ2396YAZZ QCNCM239OYAZZ

QCNCM231

8YAZZ

QPLGJ2397YAZZ

QFSHA2002YAZZ VCQYCUl HM104K VCEAAHl

VW1

08h

VCTYPUI EFl

042

VCEAAU~ HWI

06n

VHDl1El/l/l-1

VHDUS1060,‘/-1

QFS-

A2042YAZZ

RCi LF2003YAZZ VS2SA937Ql

I -

VRD-

ST2EFl

83J

VRD-

ST2EF103J

VRD-

ST2EFl

54J

VRD-

ST2EF471

RRLY- 21

18YAZZ

RALM- 2021YAZZ RH-

VX201 SYAZZ

DUNTKAO91

WREO

DUNTKAO92WREO GMADi

A031 WRRO

HPNLCAl

59WRJ0

LANGTAO46WRWO LCHSMAOI 4WRWO

FOVN-

AO29WRYO PCUSU0373WRPO

NCPL-

AOO7WRFO

NTNT-

AOO5WRHO LFi

X-

AOO7WRFO PCOVPA050WREO PGLSPOOl

5YBE0

LANGQAO42WRWO

PDUC-

03OOWRFO

PDUC-

AO75WRFO LANGQA026WRPO FFANJ0030WRKO LANGKOl

40WRW0

LANGF0224WRPO LANGK0309WRFO MLEVFOl

24WRE0 LANGK031 1 WRFO

MLEVP0080WRFO

PDUC-

0466WRWO

PDUC-

0508WRWO

PDUC-

AO93WRWO

PDUC-

AO73WRWO

FDUC- 01 91 WRWO

PCUSU0373WRPO

PGi DHAOO7WRWO PREFHA005WRPO PREFHA004WRPO PREFHAOO7WRWO PREFHAOOGWRPO

PREFH0031 WRPO

GCOVHO238WRWO PCUSU0279WRPO

PFPF-

AOO9WREO

PFPF-

0036WREO

PFPF-

AOO8WREO

PDUC-

AO94WRWO

PDUC-

0299WRWO

FSKR- AOO2WRWO

PGi DJAOO2WRWO

FFANMA002WRYO

NBLTKAOO5WREO

NPLYBOO3OWRFO

Relay unit

12-pin

connector (A)

&pin

wire connector

(0)

13-pin

wire connector

(C)

8-pin connector (I)

Fuse holder Capacitor

0.1

Capacitor

1000

Capacitor

0.1

Capacitor

Diode (11 El ) Diode (US1 060)

5ov 35v 25V 5ov

Fuse Filter coil (22

PH)

Transistor

(2SA937Q)

Resistor

18kn

Resistor

10kn

Resistor 150k

Resistor

470

Relay

(D.C.14V)

Buzzer

Varistor

Key unit: R-8470 Key unit: R-8570 Display filter Control panel frame Key unit angle Control panel back plate

ll4W lI4W 1/4w 1/4w

OVEN PARTS

Oven cavity Shading cushion (B)

Turntable coupling Turntable tray

Oven lamp glass flange

Waveguide cover

Oven lamp screen glass Oven lamp mounting plate Magnetron cooling duct (A) Magnetron cooling duct (B)

Turntable motor mounting plate

Fan blade assembly Hinge mounting plate Chassis support Upper latch hook Monitor switch lever Lower latch hook

Stop switch lever Steam duct (left): R-8470

Steam duct (left): R-8570 Steam duct (right)

. Steam duct (upper) Steam duct (top) Steam duct cushion (A) Air guide duct Thermal protection plate (left) Thermal protection plate (right) Thermal protection plate (oven cavity top) Thermal protection plate (upper) Thermal protection cover Sensor cover: R-8570 only Steam duct cushion (B) Thermal protection sheet (right) Thermal protection sheet (left)

Thermal protection sheet (upper)

Convection air duct (upper) Convection air duct (left) Convection air guide (left) Convection air guide (upper) Convection fan Convection fan belt Pulley A (for convection fan)

1 1 1

1 1

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

AF AG AH

AF AC

AE AD AG AH AA

AE AH

AF AN AG

AE AA

AK AK

AF AC

Page 47

R-8470 R-8570

Note :

The voltage supplied to the parts marked

I’*,,

is greater than

25OV.

: Refer to “REPLACEMENT PARTS LIST” described at after page.

REF.

NO.

PART NO.

DESCRIPTION

)

Q’TY 1 CODE

4-42

NPLYB0031 WRFO

Pulley 0 (for convection motor)

4-43

LANGQ026OWREO

Convection motor mounting plate

4-44

FBRGMAOOl

WREO

Fan shaft

4-45

LFi

X-

AOOBWRWO

Shaft mounting plate (A)

4-46

LANGTAO5OWRWO

Shaft mounting plate

(0)

4-47

PGi SHOO38WREO

Heating element holder

4-48

PDUC- A071 WRWO

Damper duct

4-49

PFTA-

AOO7WRWO

Damper

4-50

NSFTT0071 WREO

Damper shaft

4-51

PCUSUO269WRPO

Damper cushion

4-52

MCAMPAOl

1 WREO

Damper cam

4-53

PCUSU0471 WRPO

Steam duct cushion (C)

4-54

PGi

SH0041 WREO

Heating element insulator

4-55

FROLPAOOBWRKO

Turntable roller assembly

9 5-10 5-l 1 5-l 2 5-13 5-14 5-15 5-16 5-17 5-18

5-l 9 5-20 5-21 5-22 5-23

CDORFAO92WRKO

Door assembly, complete: R-8470

CDORFAO94WRKO

Door assembly, complete: R-8570

FANGTOO92WRYO

Latch plate

FLEVFOl

06WRYO

Joint lever

LSTPPAOl

8WRFO

Upper latch head

LSTPPAOl

9WRFO

Lower latch head

MSPRT0059WREO

Latch spring

HDECQAO4OWREO

Door sash upper

DDORFA053WRYO

Door panel ass’y

HDECQAO29WRFO

Door sash (right)

HDECQAO3OWRFO

Latch cover

LX-

BZOl43WREO

Screw (torx); latch cover mtg

HDECQA041 WREO

Door sash (lower)

HDECAAO33WREO

Door decoration plate

PSLDMAO29WRFO

Ferrite

LANGTAO47WRWO

Sash mounting plate (upper)

LANGTAO48WRWO

Sash mounting plate (lower)

FHNG-

0078WREO

Door hinge ass’y

HDECQA028WRFO

Door sash (left)

PGLSPAO45WREO

Door glass: R-8470

PGLSPAO46WREO

Door glass: R-8570

PCUSG021 3WRP0

Door sushion (short)

PCUSG021 2WRP0 Door cushion (long)

PSLDMAO38WREO

Door ferrite (upper)

LX-

CZAOl

7WRE0

Screw; sash mounting plate mtg

LX-

CZOO26WREO

Screw; door hinge ass’y mtg

6-l 0 6-l 1

6-12 6-13

FAMi - AOO9WREO FAMi - AOO8WREO

QW-

HZOO59WREO

QW-

HZOO68WREO

FW-

VZAl

86WRE0

FW-

VZAl

85WRE0

LHLDWQ002YBEO LHLDWQ005YBEO LBNDCQ004CBEO

TSPCNA31 2WRR0

TSPCNA31

3WRR0

TCAUHOl 14WRRO TCADCO222WRRO

NSEAl

69WRR0

NSEAl

70WRR0

SCREWS, NUTS, WASHERS,

PINS AND RING

1 LX-

BZ0055YBEO

LX-

BZOl

41 WREO

3 LX-

BZOl

86WRE0

4 LX-

CZOOl

7WRE0

5 LX-

CZOO47WREO

6 LX-

CZOO52WREO

DOOR PARTS

MISCELLANEOUS

High voltage wire A (Trans.-Capa.) High voltage wire B

(Msg.-Capa.)

Main wire harness Thermistor harness Wire holder Wire holder

(Puree

lock “EXL”)

Wire holder (WH-1

,“M”)

Name plate: R-8470 Name plate: R-8570 Caution label Cook book Operation manual: R-8470 Ooeration manual: R-8570

Screw ;waveguide cover mtg Screw ;monitor switch lever mtg Screw ; cord mounting bracket, capacitor mounting bracket,

magnetron cooling duct (B), base cabinet (A) and rectifier

mtg

Screw ; convection air guide (upper) mtg Screw ; rear cabinet, base cabinet (A), (B) and control panel

assembly mtg

Screw

;

upper and lower latch hook mtg

1 1 1 1 1 1

2 1 1 1 1 1 1

AC AC AL AL

AA AA AC AA

AE AD AC AC AC

AK AA

AS AH

AZ AA

AE AA AA

AS AD AD

AL AA AA AA AC

AK AN

AA AA AA

AA AA

Page 48

R-8470 R-8570

Note :

The voltage supplied to the parts marked

“*”

is greater than

250V.

: Refer to “REPLACEMENT PARTS LIST” described at after page.

REF. NO.1

PART NO.

DESCRIPTION

Q’TY 1 CODE

9 7-10 7-11 7-12 7-13 7-14 7-15 7-16 7-17

7-18 7-19 7-20 7-21 7-22

7-23 7-24 7-25 7-26 7-27 7-28

7-29 7-30

7-31

7-32 7-33 7-34 7-35

7-36

7-37 7-38 7-39 7-40 7-41

LX-

EZOO46WREO

Screw ; outer case cabinet mtg

2 AB

XBPSD30Pl

2KOO

Screw ; fuse holder mtg

XBPSD30Pl

6KOO

Screw ; damper switch mtg

XBPSD40P25000

Screw ;

fan motor and convection motor mtg

4 AA

XBPSD50Pl

2KOO

Screw ;

magnetron mtg

XBPSD50Pl

2KS0 Screw ; magnetron mtg

XBPSDGOPl

4KS0 Screw ; power transformer mtg

XBPUW40P10000

Screw ;

heating element mtg

2 AA

XBSSD40Pl

2000

Screw ; door assembly mtg

4 AA

XBTUW4OPO6000

Screw ;

waveguide cover mtg 3

XBTUW4OPO8000

Screw

;

damper duct, convection air duct (upper), (left), oven 17

lamp mounting plate and shaft mounting plate mtg

XCBWvv30P08000

Screw ; thermistor mtg 2

XCPSD30P06000

Screw ; AH sensor and sensor cover mtg: R-8570 6 AA

XCPSD30P08000

Screw ;

oven lamp mtg

XCPSD30Pl

0000 Screw ; damper motor mtg 2

XCPSD40P08000

Screw ;

damper duct, steam duct (right), (left), (upper), thermal

AA protection plate (right), (left), thermal protection cover, oven lamp mounting plate, sensor cover and air guide duct

mtg

X C P S D4 0 P 2 7 0 0 0

Screw ; cord anchorage (upper) mtg 2 AA

XCPWW3OPl

oxuo

Screw ;

heating element holder and heating element insulator mtg 4 AA

XCTSD40P08000

Screw ; convection motor mounting plate and damper duct mtg

XCTSD40Pl

0000

Screw ;

cord anchorage (lower) mtg

XFTSD40Pl

0000

Screw ;

plug case mtg

XHPSD30Pl

2XS0

Screw ; transformer (for control unit), relay unit and control unit 8 AA

mtg

XOTSC40Pl

2000

Screw ;

outer case cabinet mtg

LX-

NZ0029YBEO

Nut ; convection air duct upper, oven lamp mounting plate

AA and convection motor mtg

LX-

NZOO7OWREO

Nut

;

earthing

XNESD40-

32000

Nut ; fan motor mtg

XNEUW40-

32000 Nut ; convection fan mtg

XWHEZl 2-

05300

Washer ; turntable coupling mtg

XWHSD50-

08000

Washer ; monitor switch lever mtg

XWHUW40-

08000 Washer ; convection fan mtg

xwsuw40-

10000

Washer ; convection fan mtg

XVvWSD60-

08000

Washer ; power transformer mtg

XPNSC80-

- - 000

Pin ; convection fan and pulley (A) mtg

XPNSDGO-

- - 000

Pin ;

pulley (B) mtg

XRSSPl 2-

04000 Ring ; turntable coupling 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

Page 49

-8470

R-8570

REPLACEMENT

PARTS LIST

This replacement

parts

list shows tnterchangeabillty of

marked ( *) parts on

the control panel parts to the alterations

product locatlons.

This

lrst

has

been prepared to

show

LISTED PART NO

along with the

USED PART NO

side

by side.

REF. NO.

C3 et.c

c4 C5 etc

Cl0

C3O c50 C8O C81

D7 etc

etc

IC2 01

Cl50 etc 080

082

LISTED PART NO.

USED PART NO.

_ ._-.~--

----

RC-

EZA059DREO

RC-

EZTIOGAFI

RC-

EZAO61

DREO

RC-

EZT475AFl

RC-

KZA004DREO

+CKYATl

EXI

53N

RC-

EZA057DREO

RC-

EZTl 07AFl

RC-

EZA058DREO

RC- EZT226AFl

RC-

EZAOGODREO

RC-

EZT476AFl

RC-

KZI

04QDRE0

L!CTYPGl

EFlO4Z

RC-

EZA063DREO

RC-

EZT474AFl

RC-

EZAO62DREO

ARC- EZT335AFl

RH-

DZA002DREO

L’HDUSl 06C; -

RH-

DZAOl

1 DREO

;‘HDl

1 El

’

RH- I ZOO21 WREO RH- I X21

54bAZZ

RH-TZ0029DREO

VS2SB953-

Q/ 1

RH-TZA022DREO

L’SDTA

143-A-l

RH-TZA025DREO

‘VS2SC2021

f 1 A

RH-TZA021 DREO

VS2SB851

R/ / -

REF. NO.

R2 RS R4

R22 etc

R23 eic

R30 R55

e:c R66 e:c R70

etc

R83

R84

R113

R200 R204

LISTED PART NO.

USED PART NO.

R;1- DZ331

NDREO

RD-

ST2EF331

DZl

51 PDREO ‘, SD-

ST2HAl

51 J

RR-

DZl

21 PDREO ‘x RD-

S72HAl

21 J

RR-

DZ277 PDREO

-.‘RD- ST2HA271

RR-

DZ473DDREO

,‘RD- ST2EF473J

RR-

DZl

53DDRE0

,‘RD- ST2EFl

53J

RR- DZ471

hDRE0

RD- ST

2EF471

UK- DZ103CDREQ

.RD-S’2EF103J

‘(H- DZ102NDREO

QRD- S’2EF102J

HR- DZ273NDREO

.iRD- ST2EF273J

PR- DZ472NDREO

s,‘RD-ST2EF472J

RR-

DZ222DDREO

\‘RD- ST2EF222J

RR- DZ563NDREO

L’RD- ST2EF563J

FR- DZ204DDREO

11 R

D - S

-2EF204J

RR-

DZ201NDREO

JRD-STZEFZOlJ

SERVICE INFORMATION FOR CONTROL UNIT

Some sets of 1st

lot of model R-8470

have

jamper wires J54

and

.J55 inserted

So, please

adjust them to improve

performances of

LSI,

complying with this Service Manuai

The

following are steps to take:

(1)

Remove

jamper wires J54

and

J55 from

PWB of

control unit to

open Its pin nos 51 and 52 of LSI.

(2) Add

C65 to

PWB of control unit.

Page 50

R-8470 R-8570

CABINET

PARTS

I 1

2 / I

Page 51

R-8470 R-8570

2 3 4

Page 52

R-8470 R-8570

Page 53

R-8470 R-8570

DOOR

ASSEMBLY

MISCELLANEOUS

6-3

Trans.

Page 54

R-8470 R-8570

General:

Connect:

FIXING PROCEDURE OF CORD ANCHORAGE

As for the above subject, sometime it may cause to have wrong fixing about two pieces of cord anchorage unit. But this cord anchorage is an important part for the safety, therefore it must be fixed correctly and firmly.

The cord anchorage which is used to secure the mains supply cord can be fixed in two different ways.

If you fix them s shown in Figure 2, the mains supply cord will not be secured firmly.

Therefore, make sure to fix them as shown in figure 1.

LSTFFOOO8Y

BFO

SUPPLY

CDRD

ANCHORAGE

WPPER) LBTPPWlO8YBFO

Figure 1. Correct Fixing

Figure

2. Wrong Fixing

‘86 0 SHARP CORP. (9N0.75E) Printed in Japan