Sharp R-4A10, R-4A20, R-4A30 Service Manual

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R4AlO RQAZO R4A30

SHARP SERVICE MANUAL

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MICROWAVE OVEN

MODELS R-4Alo

R-4A20

R-4A30

Photo R-4AlO

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.

(RDlGlOlU)

TABLE OF CONTENTS

Page

FOREWORD

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

CAUTION, MICROWAVE

RADIATION

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

PRODUCT DESCRIPTION

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

OPERATION

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

SERVICING

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

TOUCH

CONTROL

PANEL ASSEMBLY .....................................................................................................

COMPONENT

REPLACEMENT AND

ADJUSTMENT

PROCEDURE

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

MICROWAVE MEASUREMENT PROCEDURE

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

PICTORIAL

DIAGRAM ..................................................................................................................................

CONTROL

PANEL CIRCUIT

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

PRINTED

WIRING

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

PARTS

LIST

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

PACKING

AND ACCESSORIES

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

SHARPCORPORATlON

R4AlO R4A20 R4A30

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Photo R-4A20

Photo RQA30

SERVICE MANUAL

SHARP

MICROWAVE OVEN

FOREWORD

This Manual has been prepared to provide Sharp Corp. Service Personnel with complete Operation and Service information for the SHARP MICROWAVE ovens, R4A10/R4AZ0/R4A30.

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

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

(RD361 ON)

CAUTION

MICROWAVE RADIATION

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

an open waveguide or antenna while the device is ener

ized.

( D36201U)

SHAF?PCORPOf?ATtON

OSAKA, JAPAN

1 OPERATION

1 SERVICING

TOUCH CONTROL

PANEL ASSEMBLY

COMPONENT REPLACEMENT ’ AND ADJUSTMENT PROCEDURE

MICROWAVE

MEASUREMENT

[ WIRING DIAGRAM

PRODUCT DESCRIPTION

EXPLANATION OF MICROWAVE COOKING

The Sharp Microwave Oven uses microwave energy to

produce heat in the food to be cooked. Unlike conventional ovens microwave energy will cook foods without applying external heat.

Microwaves, which are short electromagnetic waves of RF (radio frequency) energy, pass through materials

such as glass, paper, china and most plastics. Materi-

als 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 micro-

wave energy. As the microwave energy at a frequency of 2450 Megahertz enters the food, the molecules align themselves with the energy. Because the microwaves are changing polarity every half cycle, the food molecules are changing direction every half cycle or oscillating back and forth 4,900,000,000 times per second. This high speed oscillation causes friction between the molecules, thereby converting the microwave energy to heat.

(RD41101U)

SPECIFICATION

ITEM

Power Requirements

240 Volts 50 Hertz

DESCRIPTION

Power Consumption Power Output

Case Dimensions

Single phase, 3 wire earthed 13oow

700 watts nominal of RF microwave energy (2 liter water load) Operating frequency of 2450MHz

Width 520 mm

Height 318 mm including foot Depth 393 mm

Cooking Cavity Dimensions

Width 345 mm

Height 217 mm

Depth 364 mm

Control Complement

t--r III-‘- 1-r

3631 vveignr

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

Repetition Rate;

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

MED HIGH

Full power throughout the cooking time

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx.

70% of Full

MED

Power

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

MED LOW DEFROST

approx.

50% of

Full Power

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

LOW

approx. 30% of Full Power

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx. 10% of

INSTANT COOK/START COOKING

Full Power

AUTO START COOKING EASY DEFROST, AUTO COOK EASY REHEAT MORE/LESS pad

a- c .

1 Approx. 1 1.3 kg

(HD44101U

NOTE:

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

R-4A20 R4A30

Ventilation

openings

7. Door latches

Oven lamp

Door button open

3. Oven door with see through window

9. Touch Control Panel

Removable

turntable

10.

Digital readout

5. Roller Stay

11.

Waveguide cover

6. Hinges

12. Access cover for oven lamp replacement

Touch Control Panel

AUTO COOK MENUS AUTO COOK

Touch to select Auto Cook mode.

EASY REHEAT PAD

Touch to select Easy Reheat mode. L EASY REHEAT MENUS EASY DEFROST PAD

Touch to defrost meat by entering weight. NUMBER PADS

Touch to enter cooking times, clock time, weight or quantity

of food, or to select the Auto Cook or Easy Reheat menus.

- STOP/CLEAR PAD Touch to erase during programming. Touch once to stop operation of oven during cooking; touch twice to cancel cooking programme.

AUTO START/CLOCK PAD

Touch to set clock or Auto Start time.

VARIABLE COOKING CONTROL PADS

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

MORE(A), LESS(r) PADS

Touch to increase/decrease the time in one minute increments during cooking or to increase/decrease the time whilst programming the Easy Reheat, Auto Cook or Easy Defrost modes.

- INSTANT COOK/START PAD Touch once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is touched during cooking.

Touch to start oven after setting programmes.

MEMORY

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

R4AlO Ez

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

(RD71101 U)

OFF CONDITION

Closing the door activates both door latch switches: upper latch switch and lower latch switch. (in this condition, the monitor switch contacts are opened.) The stop switch is activated by the latch head. When oven is plugged in, 240 volts A.C. is supplied to

the control unit.

But no components in the oven will operate.(Figure o-1 .) Note: When the door is opened by pushing the door

open button, the contacts of the relay RY-1 are

closed, then the oven lamp lights. The display will show flashing “88:88”. To set any program or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and I:00 will appear and count up every minute.

COOKING CONDITION

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

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

RELAY

CONNECTED COMPONENTS

RY-1

Oven h-np/turntable motor/fan motor

RY-2

power transformer

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

3.5 volts A.C. output on the filament winding, and approximately 1900 volts A.C. on the high voltage winding.

The filament winding voltage heats the magnetron filament and the H.V. voltage doubler circuit.

winding

voltage is sent to a

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.

oven will revert to the OFF condition.

The

6. When the door is opened during a cook cycle, monitor switch, upper latch switch and lower 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.

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

tion in the followina sequence.

(2)

When the door opens from a closed position

the stop switch, upper and lower latch switches first operate to open their contacts, and then the monitor switch contacts close. When the door is closed from the open position, the monitor switch contacts first open, and then the contacts of the stop switch, upper and lower latch switches close.

In case the upper latch switch fails with its contacts closed when the door is opened, the monitor switch will form a short circuit through the monitor fuse, and

the upper latch switch, causing the monitor fuse to blow.

MED HIGH, MED, MED LOW/DEFROST, LOW

COOKING When Variable Cooking Power is programed, the 240 volts A.C. is supplied to the power transformer intermittently through the contacts of relay( RY -2) which is operated by the control unit within a 30 second time base. Microwave power operation is as follows:

VARI-MODE

HIGH (100% power)

MED HIGH

(approx. 70%‘power)

MED (approx. 50% power)

MED LOW/DEFROST

ON TIME

32 sec.

24 sec.

18 sec.

OFF TIME

0 sec.

8 sec.

14 sec.

(approx. 30% power) LOW

(approx. 10% power)

12 sec.

6 sec.

20 sec.

26 sec.

Note: The ON/OFF time ratio does not correspond

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

(RD71401 U)

J-4

240V-50Hz

A-L

240V--5OHz

SCHEMATIC NOTE CONDITION OF OVEN

1 DOOR CLOSED 2 CLOCK APPEARS

ON DISPLAY

Fuss MS.3A

SWITCH

TURNTABLE MOTOR

l-L=&

---

Jr--+ I

-e.-

I a-T

M v RECTIFIER

L------A

MAGNETRON .

SCHEMATIC

I I

CONTROL HIGH

4 START PAD

TOUCHED

NOTE: CONDITION OF OVEf

1 DOOR CLOSED

2 COOKING TIME

PROGRAMMED

3 VARIABLE COOKING

I I s-a I -

1 k&i~ 1 UNIT

CONTROL

‘a2

45-

e-v

M V RECTIFIER

Lam-’

MAGNETRON N

Figure. 0- 1, Oven Schematic-Off Condition

Figure. O-2. Oven Schematic-Cooking Condition

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bbb

EZ::

R.4A30

DESCRIPTION AND FUNCTION OF COMPONENTS

UPPER LATCH SWITCH The switch is activated by the upper latch head on the door while the door is closed. When the door is opened, the switch interrupts the circuit (except oven lamp).

LOWER LATCH SWITCH The switch is activated by the lower latch head on the door. When the door is opened, the switch interrupts the circuit to transformer.

A cook cycle cannot take place until the door is firmly closed and the INSTANT COOK/START pad touched.

STOP SWITCH The stop switch is located on latch hook and activated by the lower latch head and switch lever. When the open button is depressed while the oven is in cook cycle, the stop switch contacts open to de-energize the reiay( RY-1) and reiay( RY-2) circuits in the control and causes cook time count down to pause.

MONITOR SWITCH

The monitor switch is activated (the contacts of “NC”

opened) by the upper latch head on the door while the door is closed. The switch is intended to render the oven inoperative by means of blowning the monitor

fuse when the contacts of the upper latch switch fail to open when the door is opened.

Functions:

1. When the door is opened, the monitor switch

normal close contacts (to the ON condition) due to their being normally closed. At this time the upper latch switch is in the OFF condition (contacts open) due to their being normally open contact switch.

2. As the door goes to a closed position, the monitor switch normal close contacts are first opened and then the upper latch switch contacts close and lower latch switch contacts, (On opening the door, each of these switches operate inversely.)

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

contacts.

CAUTiON:BEFORE REPLACING A BLOWN MONI-

TOR FUSE, TEST THE UPPER LATCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

DOOR OPEN MECHANISM

The door can be opened by pushing the open button on the control panel, refer to the Figure D-l.

When the open button is pushed, the cook switch lever on the latch hook is moved upward, operating the latch head. The latch head is moved upward, and released from the latch hook. Now, the door can be opened.

OVEN LAMP The oven lamp illuminates the interior of the oven so that food being cooked can be examined visually through the door window without having to open the door.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws cooling air through the back vents. This cooling air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channeled through the oven cavity to remove steam and vaports given off from the heating foods.

it is then exhausted at the back of the oven cavity.

MAGNETRON TEMP. FUSE The temp. fuse located on the oven cavity is designed to prevent damage to the magnetron if an overheated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc.

Under normal operation, the temp. fuse remains closed.

However, when abnormally high temperatures are reached within the magnetron, the fuse will open, causing the oven to shut down.

This is a fuse and it does not reset.

OVEN TEMP. FUSE

When foods in oven cavity fire, oven temperature fuse stops ventilating from fan motor and extinguishes fire

in oven cavity before fire goes outside the unit.

. MONITOR

SWITCH

UPPER

LATCH

SWITCH

OPEN BUTTON

Figure D-1. Latch Switches Adjustment

SERVICING

TROUBLESHOOTING GUIDE

MIA10 iE2::

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedures section.”

IMPORTANT: If the oven becomes inoperative because of a

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

PROBLEM

POSSIBLE CAUSE

TEST PROCEDURE OR

CORRECTION

OFF CONDITION

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

Shorted wire in power cord or wire harness.

Replace cord or check wiring.

Oven fuse blows when power cord

Shorted wire harness. Check and repair wire harness.

is plugged into wall receptacle.

” 88:88 ” does not appear in display

when power cord is first plugged

into wall outlet.

Defective monitor switch.

NO power at outlet.

No power from service entrance.

Procedure G.

Check home fuse.

Check wall outlet.

Open wire in power cord or wire harness.

Replace same or repair wiring.

Blown fuse.

Procedure H.

Defective temp. fuse.

Procedure F.

(magnetron and oven)

Open wire In power cord, wlrrng harness, Replace or reparr wrring. or wrring between control panel assembly unrts.

Defective control unit.

Procedure I.

Display does not operate properly

Defective stop swrtch.

Procedure E.

when STOP/CLEAR key is touched,

(Buzzer should sound and time of

Defective control unit.

Procedure I.

day should appear in display.)

Oven lamp does not light with door opened.

Defective oven lamp.

Defective stop switch.

Replace oven lamp.

Procedure E.

Defective control unit,

Open or loose wire connection to the above

components.

Procedure I.

Check wiring.

COOKING CONDITION

Oven lamp does not light in cook

cycle.

Defective relay Fly-1 on control unit.

Procedure I.

(Do light when door is opened.)

R4AlO R4A20 R4A30

TROUBLESHOOTING GUIDE (CONT’D)

PROBLEM

POSSIBLE CAUSE

TEST PROCEDURE OR

CORRECTION

COOKING CONDITION (CONT’D)

Oven lamp does not light at ail.

Burned out bulb.

Replace oven lamp.

Open wiring to oven lamp socket.

Check and repair wiring.

-1

Cook indicator appears in display but turntaMe motor does not operate.

Defective relay RY-1 on control unit.

Turntable motor defective.

Open or loose wiring between control unit and motor.

Procedure I.

Replace motor.

Check and repair wiring.

Oven lamp lights but fan motor

does not operate.

(Turntable motor does operate)

Defective fan motor,

Replace fan moter.

Open or loose wiring to fan motor. Check and repair wiring.

Oven does not go into cook cycle when INSTANT COOK/START

key is touched.

Upper and Lower latch switches and stop switch defective or out of adjustment.

Blown fuse.

Procedure E.

Procedure H.

Defective temp. fuse. (Magnetron and Oven) 1 Procedure F.

-1

Defective relay RY-1, RY-2 on control unit. Open or loose wiring to the above

components.

Procedure I.

Check and repair wiring.

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

Defective magnetron.

Defective relay RY-2 on control unit.

Procedure A.

Procedure I.

of cook cycle)

Defective power transformer.

Procedure B.

Defective rectifier.

Procedure C.

Defective high voltage capacitor.

Procedure 0.

Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food).

Defective control unit.

Procedure I.

Open or loose wiring to the above components.

Check and repair wiring.

Turntable motor does not operate.

Replace turntable motor.

3ven does not cook properly when :ooking control set to LOW, ME0 LOW, MED, MED HIGH cooking lowers.

Operates properly on HIGH.)

Defective control unit.

Open or loose wiring between the above

components.

Procedure I.

Check and repair wiring.

R4AlO EE:

PROBLEM

POSSIBLE CAUSE

TEST PROCEDURE OR

CORRECTION

EASY DEFROST condition touching INSTANT COOK/START Pad, “ERROR” appears.

Programmed incorrectly

EASY DEFROST will only operate on a specificweight. Range for each food category. See steps for Easy Defrost is Operation Manual.

Defective control unit.

Procedure I -

R4AlO R4A20 R4A30

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 Microwave output power from the magnetron can be measured by way of substitution, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t(second), approximately P x t/4.2 calorie is generated. On the other hand, if the temperature of the water with V(mi) rises AT ( “C) during this microwave heating period, the calorie of the water is V x AT. The formuiar is as follows;

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

Our condition for the water load is as follows:

Water load . . . 2000 ml,

Heating time . ..120seconds

P = 70 x AT

Measuring method;

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

2. Measure the temperature of water before heating and also after heating during 120 seconds by microwave, and calculate the temperature rise. The temperature rise should be the average of temperature differences measured in each beaker.

3. The output power should be calculated as follows. In case the measuring result is not satisfactory, execute the measurement several times and judge the result from the synthetic point of view. Microwave output power should be within + 15% of the nominal one.

Calculation of output power; Microwave output power

. ..P(W)=7Ox AT(OC)

AT = ( ATL + ATR) / 2 : average temperature rise ATL = (TL2 - TLl), ATR = (TR2 - TRl)

TL2 : water temperature after heating in left beaker TLl : water temperature before heating in left beaker TR2 : water temperature after heating in right beaker TRl : 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 IO f 1 “C. (The salt water should be contained

one (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 mer-

cury thermometer is recommended.

R4AlO R4A20

TEST PROCEDURES (CONT’D)

R4A30

PROCEDURE

LETTER

COMPONENT TEST

4. Room temperature should be around 20 “C.

5. Power supply voltage should be specification voltage.

B POWER TRANSFORMER TEST

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

Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1.61 ohms and the resistance of the high voltage coil

should b approximately 79 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 probably defective and should be replaced.

(R082601 U)

HIGH VOLTAGE CAPACITOR TEST

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

if the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open, between the terminals using an ohmmeter.

Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate approximately 10M R once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between the terminals. if it is shorted, replace the capacitor.

(RD82603U)

SWITCH TEST

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

Table: Switch Connection

Connection

Common Terminal-Normally Open Terminal

Common Terminal-Normally Close Terminal ’

Operation

(COM) (NOI

(COM)

(NC)

Plunger released

Open circuit

Close circuit

Plunger pushed

Closed circuit

Open circuit

! I

R4AlO

R4AZO R4A30

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

MAGNETRON AND OVEN TEMP. FUSE TEST

A continuity check across the temp. fuse terminals should indicate a closed circuit uniess the temperature of the temp. fuse reaches approximately 145 “C. An open magnetron temp. fuse indicates overheating of the magnetron assembly. If the temp. fuse indicates a open circuit, replace the temp. fuse and check for restricted air flow to the magnetron through the opening in the chassis, especially the air duct and fan motor. An open oven temp. fuse indicate overheating of oven cavity.

If the oven temp. fuse indicates a open circuit, replace the oven temp. fuse and check the reason of the

oven heating and check the wiring etc.

MONITOR SWITCH TEST

Before performing this test, make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure. Disconnect the pink wire lead from the monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuater is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective.

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

(RD82603U)

BLUE & WHITE WIRES

MONITOR SWITCH

UPPER LATCH SWITCH

LOWER LATCH

J5WITCH

STOP SWITCH

SWITCH

LEVER

BLOWN OVEN FUSE

If the oven fuse in the upper latch switch-monitor switch circuit is blown when the door is opened, check the upper latch switch and monitor switch before replacing the blown fuse.

If the oven fuse is blown by improper switch operation, replace the defective switch and oven fuse at the same time. Replace just the oven fuse if the switches operate normally. CAUTION; REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST.

R4A10

E%1:

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. in this service manual, the touch control panel assembly is divided into two units Control Unit and Key Unit and troubleshooting by unit replacement is described according to the symptoms indicated.

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

2. Control Unit The following symptoms indicate a defective control unit. Replace the control unit. 2-l In connection with pads. a)

When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light up. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears.

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.

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,

PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARDtPWB) IS OPEN.

To protect the electronic circuits, this model is provided with a fine foil pattern added to the

primary on the PWB, and this fine pattern serves as a substitute coil. If the foil pattern is open, follow the

troubleshooting guide given below for repair.

Problem: POWER ON, indicator does not light up.

STEPS OCCURANCE

The rated voltage is not applied to POWER terminal of CPU connector (CN-A)

The rated voltage ;s applied to primary side of power

transformer.

Only pattern at “a” is broken.

Pattern at “a” and “b” are broken.

CAUSE OR CORRECTION

Check supply voltage and oven main unit.

Power transformer or secondary circuit defective. Check and repair.

l Insert jumper wire 27 and solder.

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

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

spection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.

Et;00

R4A30

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following

units as shown in the touch control panel circuit. (1) Key Unit (2) Control Unit

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

(RD911 A3U)

Key Unit

The key unit is composed of a matrix, signals generated

in the LSI are sent to the kev unit through SO-S6. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through K4-K7 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit

and indicator circuit.

(RD915Bl U)

LSI

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

(RD916Al U)

Power Source Circuit This circuit generates voltage necessary in the control unit.

Symbol Voltage Application VDD -12v

VREF

LSI (ICI), ACL circuit

-6.15V LSI (ICl) VP VF+ VF-

-24V Fluorescent display tube : Grid

and anode voltage

3V p-p [‘t,““nt of fluorescent display

(VF+ to VF- voltaqe)

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.

(RD918Al U)

ACL Circuit A circuit to generate a signal which resets the LSI to the initial state when power is supplied.

(RD919Al U)

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

(RD91 AA1 U)

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

(RDSl BAZU)

Relay Circuit To drive the magnetron, fan motor, turntable motor and light the oven lamp.

(RD91 CB2U)

Indicator Circuit

Indicator element is a Fluorescent Display.

Basically, a Fluorescent Display is a triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display 6-digits, 13-segments are used for displaying figures.

(RD91 DA1 U)

R4AlO EE23::

DESCRIPTION OF LSI

LSI(IZA174DR)

The I/O signal of the LSI(IZAf74DR) is detailed in the following table.

(RD93101 U)

PIN NO. 1 1

1 SIGNAL j T

I/O

1 OUT

Sianal to sound buzzer.

A: Key touch sound (0.1 sec.).

B: Completion sound (2.0 sec.).

(RD93LAl U)

PIN NO. / 2

1 SIGNAL j VDD

Power source voltage: -12V.

VDD voltage of power source circuit input.

I/O

i IN

(RD93GAl U)

PIN NO. 1 3

i SIGNAL t VREF

I l/O

! IN

Reference voltaqe input terminal. A reference voltage applied to the A/D converter in the LSI.

The reference voltage is generally maintained at -6.15V.

(RD93GA4U)

PIN NO. 1 4

1 SIGNAL j VP

I/O

/ IN

Anode (seament) of Fluorescent Dispiav illumination voltane: -24V.

Vp voltage of power source circuit input.

(R093GA3U)

PIN NO. 1 5

i SIGNAL j INT

I I/O

j IN

Signal synchronited with commercial source frequency (50Hd. This is the basic timing for time processing of LSI.

(RO93FAl U)

PIN NO. / 6

1 SIGNAL j CNVSS

Power source voltacle input terminal. Connected to GND.

I/O

’ IN

(RD93GA2U)

PIN NO. 1 7-10

f SIGNAL 1 FO-F3

l/O

/ OUT

Seament data signals. Refer to the touch control panel circuit for the relationship between signals and indicators.

Normally, one pulse is output in every synchronized signal period, and input to the anode of the fluorescent display.

(RO939Al )

PIN NO. / 11 1 SIGNAL 1 SO

I/O

j OUT

Secament data sinnal. Signal similar to FO. Kev strobe sianal. Signal applied to touch-key section.

A pulse signal is input to K4-K7 terminal while one of D-7 line keys on key matrix is touched.

(RO939A3U)

PINNO. I12 1 SIGNAL 1 Sl

I/O

/ OUT

Segment data sianal. Signal similar to FO.

Key strobe sicrnal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-6 line keys on key matrix is touched.

(RD939A3U)

R4A30

PINNO. 113

1 SIGNAL 1 S2

I/O

j OUT

Segment data signal. Signal similar to FO.

Key strobe sianal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-5 line keys on key matrix is touched.

(RD939A3U)

PINNO. 114

1 SIGNAL 1 S3

I/O

1 OUT

Segment data signal.

Signal similar to FO.

Kev strobe sional.

Signal applied to touch-key section.

A pulse signal is input to K4-K7 terminal while one of D-4 line keys on key matrix is touched.

(RD939A3U)

PINNO. 115

1 SIGNAL j S4

I/O 1 OUT

Senment data siqnal.

Signal similar to FO.

Key strobe sinnal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-3 line keys on key matrix is touched.

(RD939A3U)

PIN NO. ( 16

1 SIGNAL 1 S5

I/O

/ OUT

Seament data sianal. Signal similar to FO.

Kev strobe signal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-2 line keys on key matrix is touched.

(RD939A3U)

PIN NO. / 17

1 SIGNAL / S6

l/O

/ OUT

Segment data sicrnal. Signal similar to FO.

Kev strobe sianal. Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-l line keys on key matrix is touched.

(RD939A3U)

PIN NO. 1 18 SeCrment data sianal.

Signal similar to FO.

1 SIGNAL j S7

I/O

1 OUT

(RD939A2U)

PIN NO. ] 19

1 SIGNAL / XOUT

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

l/O

( OUT

(RD93EAl U)

PIN NO. 1 20

1 SIGNAL j XIN

l/O

1 IN

Internal clock oscillation freguency input settinn.

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

(RD93EA2U)

PIN NO. j 21

1 SIGNAL / VSS

Power source voltage inRut terminal.

Connected to GND.

I/O

1 IN

(RD93GA2U)

PIN NO. 1 22-24 Diait selection signal.

1 SIGNAL j Dll -D9

I/O

1 OUT

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.

(RD9 8Al U)

PIN NO. 1 25 Diait selection siQnal.

Signal similar to Dl 1.

1 SIGNAL / 08

I/O

( OUT

(RD938A2U)

PIN NO. 1 26,27 Digit selection sianal.

Signal similar to Dll .

1 SIGNAL j D7,D6

l/O

j OUT

(RD938A2U)

PIN NO. 1 28

1 SIGNAL / D5

I/O

( OUT

Segment data signal. Signal similar to FO.

Terminal for manufacture test.

(RD939A2U)

Normally terminal not used.

(RD93lA3U)

PIN NO. / 29-31

Terminal not used.

1 SIGNAL

1 D4-D2

l/O

j OUT

(RD93KA2U)

PIN NO. 1 32 1 SIGNAL j Dl

I/O

I OUT

Mannetron HiQh-voltage circuit driving signal.

To turn on and off the cook relay.

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

(RD933Al U)

PIN NO. / 33

1 SIGNAL / DO

I/O

j OUT

Oven lamp, turntable motor and cooling fan motor driving signal. (Square Waveform: 5OHz)

To turn on and off the control.relay. The pulse signal j50Hz) is delivered to the control relay driving circuit and cook relay control circuit.

(RD932Al U)

PIN NO. 1 34

1 SIGNAL 1 RESET

I/O

1 IN

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

(RD93MAl U)

Ei;:

R-4A30

PIN NO.

I 35

1 SIGNAL 1 K7 I I/O

/ IN

Signal cominQ from touch kev. When either one of D-8 line keys on key matrix is touched, a corresponding signal out of SO-S6 will be input into

K7.

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

(RD93CAl U)

Terminal for manufacture test.

Normally terminal not used.

(RD93lA3U)

PIN NO.

1 36

1 SIGNAL j K6

1 l/O j IN ~

Signal coming from touch kev.

When either one of D-9 line keys on key matrix is touched, a corresponding signal will be input into K6.

(RD93CA2U)

PIN NO.

I 37

1 SIGNAL 1 K5

1 I/O i IN

Signal coming from touch key.

When either one of D-10 line keys on key matrix is touched, a corresponding signal will be input into K5.

(RD93CA2U)

PIN NO. 1 38

( SIGNAL / K4

I/O

/ IN

Signal comincr from touch kev. When either one of D-l 1 line keys on key matrix is touched, a corresponding signal will be input into K4.

(RD93CA2U)

PIN NO. j 39

1 SIGNAL j K3

l/O

1 IN

Terminal to chanse functions accordinq to the model.

By using the A/D converter contained in the LSI. DC voltage in accordance with the model in operation is applied

to set up its function.

(RD93JA2U)

PIN NO.

I 40

1 SIGNAL 1 K2

I I/O

1 IN

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

Door opened;

“L” level signal.

(RD937Al U)

PIN NO. 1 41

Terminal not used.

1 SIGNAL 1 Kl

I/O

1 IN

(RD93KA2U)

PIN NO. / 42

1 SIGNAL j KO

Terminal not used. Connected to GND.

I/O

I IN

Precautions for Handling Electronic Components

This unit uses PMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. PMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc,and sometimes it is not fully protected by the built-in protection circuit. In order to protect PMOS LSI.

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

2) When soldering, ground the technician as shown in the figure and use grounded soldering iron and work table.

~rox. I Mri

2. Shapes of Electronic Components

Transistor

DTA143ES DTCI 14ES DTDl43ES

Regurator IC: IC2

pPC79L12J

1 : OUT Terminal 2 : COMMON Termmat

3 : IN Termindl

3. Servicing of Touch Control Panel We describe the procedures to permit servicing the touch control panel of the microwave oven and the precautions you must take when doing so. To carry the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source. (1) Servicing the touch control panel with

power supply from the oven proper: CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD. Therefore, when checking the performance of

the touch control panel,put the outer cabinet

on the oven proper to keep 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 con-

nector shall be insulated with an insulating tape. After servicing, be sure to replace the

leads to their original locations.

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

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

For those models, therefore, check and repair

all the controls (with the sensor-related ones

Servicing Tools Tools required when servicing the touch control panel assembly.

1) Soldering iron: 30W (To prevent leaking current, it is recommended to

use a soldering iron with a grounding terminal.)

2) Oscilloscope: Single beam, frequency range:

DC - 10MHz type or more ad-

vanced model.

3) Others:

Hand tools

Other Precautions

included) of the touch control panel while keeping it in contact with the oven proper.

6. 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 door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to that with the oven door being closed. As for the sensor-related controls of the touch

_ control panel, checking them 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 door sensing switch (on PWB) of the touch control panel,which brings about an operational state that is equivalent with the oven door being closed. 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, here it is also possible to check the sensor-related con-

trols of the touch control panel by using the dummy resistor(s).

Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity. Connect the connector of the key unit to the control unit 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. Attach connectors, electrolytic capacitors, etc.

to PWB, taking care that all connections are tight.

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

(RD94ZA2U)

kzz:

R4A30

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: To avoid possible exposure to microwave

energy;

A. Before operating oven

1, Make sure that unlatching door slowly is ac-

companied by a click indicating actuation of monitor switch and latch switch.

2. Check visually door seal for arcing and damage.

_-.

There is a broken door hinge or support. The door is bent or warped. There is any defective parts in the latch, oven door or microwave generating and transmission assembly. There is any other visible damage to oven.

B. Do not operate oven until after repair it any of fol-

lowing conditions exist;

C. Do not operate oven

1. Door does not close firmly against front of ap-

1. Without the RF gasket.

pliance.

2. If door is not closed.

( RDA1204U)

OUTER CASE REMOVAL

To remove the components, proceed as follows.

4. Lift entire case from the unit.

Disconnect oven from power supply. Remove screws from rear and along the side edge of case. Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate.

DISCHARGE

HIGH

CAUTION: VOLTAGE

CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND RECTIFIER AND SHORT PROTECTOR)

To remove the components, proceed as follows.

Disconnect oven from power supply and remove the

outer case.

Discharge high voltage capacitor. Remove one (1) screw holding capacitor holder to

oven unit.

Remove one (1) screw holding earth side terminal

of rectifier, and remove capacitor holder.

5. Disconnect wire leads and terminal of rectifier from high voltage capacitor. Now, rectifier is free.

6. Disconnect terminals of short protector from high

voltage capacitor.Now, capacitor is free.

CAUTION: WHEN REPLACING RECTIFIER, EARTH

SIDE TERMINAL MUST BE SECURED FIRMLY WITH A EARTHING SCREW.

POWER TRANSFORMER REMOVAL

outer case.

Disconnect oven from power supply and remove

Discharge high voltage capacitor. Disconnect wire leads from power transformer

4. Disconnect filament leads from magnetron and high voltage capacitor.

5. Remove two (2) screws holding transformer to unit chassis.

6. Remove power transformer.

MAGNETRON REMOVAL

Disconnect oven from power supply and remove

outer case.

Discharge high voltage capacitor. Disconnect wire leads from magnetron. Remove one (1) screw holding air duct.

Carefully remove four (4) mounting screws hold the magnetron to waveguide, when removing the

screws holding the magnetron to prevent it from falling.

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

1. Re-install magnetron to waveguide flange by the four (4) mounting screws.

2. Install air duct to magnetron by one (1) mounting screw.

3. Re-connected wire leads to magnetron.

CAUTION:

WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE AND MAGNETRON MOUNTING

SCREWS ARE TIGHTENED SECURELY.

UPPER/LOWER LATCH SWITCHES, MONITOR SWITCH

AND STOP SWITCH REMOVAL

R4A30

Disconnect oven from power supply and remove outer case. Discharge high voltage capacitor. Disconnect wire leads from switches. Remove two (2) screws holding the latch hook

from oven cavity flange, and remove the latch hook.

To remove individual switch from the latch hook, push outward one (1) retaining tabs holding switch in place.

Re-install

1. Re-install each switch in its place.

2. Re-connect the wire leads to each switch. Refer to chapter “Pictorial Diagram”.

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

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

TURNTABLE MOTOR REMOVAL

Disconnect oven from power supply. Remove turntable motor cover by removing two (2)

screws.

Disconnect wire lead from turntable motor and remove two (2) screws holding turntable motor.

Turntable motor is free now.

NOTE:

This scmw must k wified 1cf8w

(XF PSD4OPlOOOO)

on Parts Liet.

XFPSD4OPlOOOO

1Omm

used the

Figure C-l.

TURNTABLE COUPLING REMOVAL

Remove turntable motor, refer to “Turntable Motor

Removal”.

Remove washer.

At this time turntable coupling will be free.

TURN TABLE

COUPLING

BOTTOM OVEN CAVITY

T.T. MOTOR

ANGLE

WASHER

‘U

( RDAl E04U)

Turntable Coupling

( RDAl E05U)

CONTROL PANEL ASSEMBLY REMOVAL

The complete control panel should be remove for re-

placement of the component. To remove control panel proceed as follows:

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

2. Discharge high voltage capacitor.

Disconnect wire reads from control panel compo-

nents.

Remove one (1) screw holding the control panel

frame to oven cavity.

Left up the control panel assembly and pull it for-

ward.

Now, individual components can be removed.

Fzi%

RQA30

UPPER/LOWER LATCH SWITCHES, MONITOR SWITCH AND

STOP SWITCH ADJUSTMENT

lf the Upper and Lower latch switches, monitor and stop switch do not operate properly due to a mis-adjustment, the following adjustment should be made.

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

2. With the door closed, adjust the latch hook by moving it back and forward, or up and down. In and out play of the door allowed by the latch hook should be less than 0.5 mm.

3. Secure the screws firmly.

4. Now, make sure of the latch switch operation. If the latch switch has not activated with the door closed, loose the two (2) screws holding the latch hook to the oven cavity front flange and adjust the latch hook position.

After the adjustment, make sure of the following points:

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

2. The Upper and Lower latch switches interupt 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.)

MONITOR SWITCH

UPf’ER

LATCH

SWITCH

LOWER LATCH SWITCH

STOP SWITCH

-SWITCH LEVER

lOPEN

BUTTON

Figure-Z. Latch Switches Adjustment

LATCH HEAD REMOVAL DOOR DISASSEMBLY

Remove the door assembly, refer to items 1 through 5 of “Door Replacement”.

Replacement of latch head are as follows:

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

UP.

3. Lift up the choke cover.

4. Now the choke cover is free from the door panel.

5. Remove the latch spring from the door panel.

6. Pushing up the latch head, it is now free from door panel.

2. Insert an iron plate (thickness of about 0.5mm) to the gap

between the choke cover and the corner portion of door

panel as shown figure to free the engagind parts.

l ROTECT llV lA?E

MAID CL

Figure-3. Latch Head Removal and Door DisasmMy

DOOR REPLACEMENT

OOOR REPLACEMENT

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

2. Discharge the high voltage capacitor.

3. Remove the four (4) screwS holding the upper and lower

oven hinge to the oven cavity. The lower oven hinge is now free.

4. Remove the door assembly with upper oven hinge by

pull it forward.

5. Separate the door assembly and upper oven hinge. The

door assembly is now free.

6. Re-installing the upper oven hinge to the new door assembly.

7. On re-installing the new door assembly, secure the door

assembly with the four (4) mounting screws to the oven

cavity. Make sure the door is parallel wrth bottom line of the oven face plate and the latch head pass through the latch

holes correctly.

Note:

After any service to the door, and approved mlcrowave survey meter should be used to assure In compliance with proper mtcrowave radiation standards. (Refer to Microwave Measurment Procedure.)

UPPER

R4AlO

AND ADJUSTMENT

EEg

DOOR ADJUSTMENT When removing and/or loosening hinge such as in the case of ; door replacement, the following adjustment criteria are taken.

Door is adjusted to meet the following three conditions by

keeping screws of hinge loose.

1. Adjust door latch head at a position where they smoothly

catch the latch hook through the latch hole. Refer to latch switch adjustment.

2. Deviation of the door alignment from the horizontal line

of the cavity face plate is to be less than 1 .Omm.

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

cavity face plate.

4. Reinstall the outer case and check the microwave leakage around the door with an approved microwave survey meter.

(Refer to Microwave Measurement Prcxedure.)

OVEN

1_1____

OUTER CASE

CABINET

Figure C-4. Door Assembly Replacement and Adjustment

R4A10 R4A20 R4A30

MICROWAVE MEASUREMENT

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

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

PREPARATION FOR TESTING: Before beginning the actual test for leakage, proceed

as follows;

1. Make sure that the test instrument is operating

normally as specific in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the per-

formance standard for microwave ovens must be

used for testing.

Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500

SIMPSON 380M

Place the oven tray into the oven cavity.

Place the load of 275 f 15ml of water initially at 20 f5 “C in the center of the oven tray. The water container should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically non -conductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to in-

sure that any leakage is measured accurately.

Close the door and turn the oven ON with the timer

set for several minutes. If the water begins to boil

before the survey is completed, replace it with

275ml of the cool water.

Move the probe slowly (not faster that 2.5cm/sec.) along the gap. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven.

(RDf31103U)

MAIN

Touch conrrol unit

SUPPLY

CORD

LATCH SWITCH

CN-0

MOTOR

THE COLOA OF CN-A IS WHITE

Figure S-l. Pictorial Diagram

--------... -~-I

I I

0 0

333

bbb LRE

000

2%3

aaa

IrZ$

$!MJ!=) (CM?d lOJ)lJO=) ‘2-S t3Jdhj

%i MCI1 03ljO3dE ION I, : +

YOMW

~lW.NWll YOlOW NV4 WV1 NitA0

%Z05NvyA

“%E

Figure S-3. Printed Wiring Board

R4A30

PARTS LIST

Note :

The voltage supplied to the parts “*” are greater than 25OV.

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

REF. NO. 1 PART NO.

DESCRIPTION

] Q’TY [CODE

ELECTRICAL PARTS

l- 6 1: ;

l- 9 l-10

l-11 l-12 l-13 l-14

l-15

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

3- 1D Cl

C2 C3,5 24,7 26;20,4

280 281 290 391 3F90

11-5 140,

DSO-57 D80,81

D83

QACCAAOllWREO Mains supply cord QSOCLAOOlWREO Lamp socket QFSHDA002WREO Fuse holder RR-WZA003WREO Monitor resistor

0.8 Q 2ow

RTRN-A204WREO Power transformer RC-QZA068WREO High voltage capacitor

FH-DZA005WREO High voltage rectifier assembly QFS-TA004WREO Temp. fuse QFS-C0019WREO Fuse M6.3A RLMPTA029WREO Oven lamp

RMOTEA076WREO Fan motor RMOTDA091WREO Turntable motor RV-MZA079WREO Magnetron QSW-MA007WREO Upper latch switch, stop switch and

cook(lower latch) switch(V-5230D-069)

QSW-,MA009WREO Monitor switch (V-5220D-070)

CABINET PARTS

2' AG

1 AE 1

AK BG

3' AF

2- 1 5: ;

GCABUAlOOWRPO Outer case cabinet TMAPCA432WRRO Schematic diagram

GDAi-A047WRWO Unit chassis

2- 4 GLEGPAOOGWREO Foot

1' AP

2- 5

LSTPPOO65WRFO Cord anchorage (upper)

AA 2- 6 2- 7

LSTPP0066WRFO Cord anchorage (lower) PCUSU0455WRPO Shading cushion

1 AA

2- 8 2- 9

PSPAGQ002YBEO Vibration proof cushion

1 AA

2-10

LBNDKA015WRWO Capacitor holder PDUC-A134WRFO Fan duct

2-11

FFANJA013WRKO Fan blade 2-1lA 2-12

LSTY-0030WRE0 Fan retainer clip

PCAPH0030WREO Cabinet cap

i AA

2-13 2-14

PHOK-A022WRFO Latch hook

2 AA

MLEVPA065WRFO Switch

lever

2-15

2-16

PCOVPA114WREO Capacitor

cover

2-17

PCUSGA207WRPO Transformer cushion

1 AE

PCUSGA2OlWRPO Transformer cushion

i AC

CONTROL PANEL PARTS

CPWBFA176WRKO Control unit QCNCMA078DREO 4-pin connector (A) QPLGJ2255DREO 3-pin connector (B) QCNCWA030DREO 12-pin connector (D)

RV-KXA009DREO Fluorescent display tube RC-KZA032DREO Capacitor

RC-EZA192DREO Capacitor

0.1 PF 50V

VCEAB31EW476M Capacitor

1000 PF 35V

47 PF 25V

VCKYF31HF103Z Capacitor

0.01 PF 50V

VCKYBllEX103N Capacitor

0.01 PF 25V

RC-KZA065DREO Capacitor VCEAB31VW475M Capacitor

0.1 j.iF 25V

VCC-F31H-680J Capacitor

4.7 PF 35V

VCC-F31H-181J Capacitor

68pF 5ov

180pF 5ov

RCRS-2008DRE0 Ceramic filter KBRGOOB (6OOkHz) VHDMPGOGB//-1Diode (MPGOGB)

VHDlSS270A/-1Diode (lSS270A)

BP AD AB AE AW

AD AB

2 AA AB AF

PC%8

R4A30

Note :

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

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

REF. NO.

PART NO.

DESCRIPTION

ICl IC2

RH-IZA174DREO LSI

Q20,83

RH-IXAOlODREO IC ( pPC79L12J)

480

VSDTC114ES/-3 Transistor (DTC114ES)

Q8l

VSDTA114ES/-3 Transistor (DTA114ES) VSDTD143ES/-3 Transistor (DTD143ES)

R2 R3

VRS-B13AA331JResistor

VRD-B12HF750JResistor

330 n 1w

;

I I I I

I I

c 2 2 2 3

R10,90

VRD-B12EF821JResistor

75 n 1/2w

VRD-Bl2EF122JResistor

820 R 1/4W

R11,15

VRD-B12EF123J Resistor

1.2k Q 1,'4W

R14,21,

12k R 1/4W

R150-156

VRD-B12EF103J Resistor

10k f2 1/4W

R30 R31

VRD-B12EF102J Resistor

lk f2 1/4W

R41

VRD-B12EF332J Resistor VRD-B12EF473JResistor

3.3k n 1/4W

242

47k R 1,'4W

350-53

VRD-B12EF563J Resistor

381

VRD-B12EF223J Resistor

56k R 1/4W

382

VRD-B12EF471J Resistor

22k n 1/4W

184

VRD-B12EF201J Resistor

470 R 1/4w

VRD-B12EF390JResistor

200 R 1/4w

?85

39 n 1/4w

XYl

VRD-B12EF623J Resistor

62k n 1/4W

?Y2

RRLY-A020DREO Relay (OJ-SH-112LM)

;p30

RRLY-A025DREO Relay (VS14MBU-5-VD4)

RALM-A007DREO Buzzer (PKM22EPT-CA) RTRNPA039DREO Transformer

TRSl :D1,2

RH-VZAOlODREO Varistor (TNRlSG471K)

:D3

VHEHZ7C2///-1 Zener diode (HZ7C-2)

:D10,20

VHEHZGC2///-1 Zener diode (HZ6C-2)

-2

VHEHZllA3//-1 Zener diode (HZllA-3) HPNLCA334WRFO Control panel frame : R-4AlO/R-4A20

-3

HPNLCA664WRFO Control panel frame : R-4A30 DUNTKA279WRKO Key unit : R-4AlO DUNTKA278WRKO Key unit : R-4A20

-4

DUNTKA311WRKO Key unit : R-4A30 JBTN-A273WRFO Open button : R-4AlO/R-4A20

JBTN-A524WRFO Open button : R-4A30 MSPRDA003WREO Open button spring XHPSD30P12XSO Screw;Control unit mtg.

3- 5 3- 6

OVEN PARTS

4- 1

DOVN-A184WRTO Oven cavity

LBOS-A028WREO Stub PCUSUA081WRPO Cushion GCOVHA075WRPO Turntable motor

4- 6

MHNG-A073WRMO Upper oven hinge

cover

FHNG-A041WRMO Lower oven hinge NTNT-A007WREO Turntable tray

4- 9

FROLPAOlOWRKO Roller stay

4-10

NCPL-A025WRFO Turntable coupling

4-11

PFiLWA021WRPO Oven lamp filter

4-12

PCOVPA178WREO Waveguide cover

4-13

PCLiC0026WREO Clip

z-14

PDUC-A133WRFO Steam duct

2-15

GFTA-A005WRWO Oven lamp access cover PCUSUA052WRPO Cushion

DOOR PARTS

CDORFA330WRKO Door assembly, complete (R-4AlO)

CDORFA332WRKO Door assembly, complete (R-4A20)

5- I

CDORFA362WRKO Door assembly, complete (R-4A30) LSTPPA034WRFO Latch head (R-4AlO/R-4A20)

5- 2

LSTPPA028WRFO Latch head (R-4A30)

5- 3

MSPRTA052WREO Latch spring

,DDORFA277WRYO Door panel CR-4AlO) c’JTF;7/ if-7

DDORFA278WRYO Door panel (R-4A20)

DDORFA306WRYO Door panel (R-4A30i

1 3 c, i, L , (7 17 J

1 2

1 2 1

1 i i 1

1 1,

AD AB AB

AC AA

AA AA AA AA

AH AM AF AS

AA AA AA

AH AY AY AY AE

1 BK 1 AC : AF AA

1 AD : AS AF

1 AH 1 AC 1 AB

1 AK

R4AlO R4A20 R4A30

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

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

* *

REF. NO.

PART NO.

DESCRIPTION

Q’TY CODE

5- 4

GCOVHA082WRFO Choke cover (R-4AlO/R-4A20)

1 AH

GCOVHA074WRFO Choke cover (R-4A30)

1 AH

MISCELLANEOUS

6- 1 QW-QZA029WREO High voltage wire A

1 AD

6- 2 QW-QZA030WREO High voltage wire B

6- 3

FW-VZA623WREO Main wire harness

1 AL

6- 4

TCAUH0114WRRO Caution label

6- 5

TSPCNA927WRRO Name plate (R-4AlO)

TSPCNA930WRRO Name plate (R-4A20)

TSPCNA994WRRO Name plate (R-4A30)

1 AC

6- 6

TiNS-A089WRRO Operation manual (R-4AlO)

TiNS-A091WRRO Operation manual (R-4A20)

i AE

TiNS-A108WRRO Operation manual (R-4A30)

:I ;

FW-VZA627WREO Latch switch harness

QTANP0020YBEO Connector CE-230

i AA

TLABS0057WRRO Fuse label

1 AA

TCADC0253WRRO Cook book

6-11 FW-VZA658WREO Stop switch harness

1 AD

6-12 QW-VZA084WREO Touch control earth wire

SCREWS, NUTS AND WASHERS

7- 1

LX-BZA036WREO Screw;

outer case cabinetcwhite) mtg.

4 AA

7- 2 XFPSD40PlOOOO Screw; 7- 3

magnetron and turntable motor cover mtg.

6 AA

XHTSD40P08RVO Screw; lamp access cover, capacitor holder,

3 AA

7- 4

monitor resistor mtg.

XOTSD40P12RVO Screw; unit chassis,

upper and lower hinge and

7- 5

control panel mtg.

XTTSD40P12000 Screw; fan motor ass'y mtg.

1 AA

7- 6

LX-EZA004WREO Screw; latch hook mtg.

7- 7

XFPSD30P08XOO Screw; lamp socket mtg.

7- 8 7- 9

XFPSD40P08000 Screw; turntable motor mtg.

t AA

2 AA

7-10

XBPSD40P25000 Screw; fan motor mtg. XBPSDSOPlOKSO Screw; power transfomer mtg.

2 AA

7-11

XFPSD40P08KOO Screw;

earth and rectifier mtg. and

7-12

T/C grounding

XHPSD40P22000 Screw; cord anchorage mtg.

1 AA

7-13

XWWSD50-06000 Washer;

7-14

XNESD40-32000 Nut;

power transformer mtg.

fan motor mtg.

2' AA

7-15

1 AA

7-16

XFPSD30PlOOOO Screw; fuse holder mtg. LX-BZA064WREO Screw;

7-17

outer case cabinet mtg.

LX-EZA033WREO ScrewtLHSTiX SCREW LR-4); outer case cabinet mtg.

; AA 7-18 7-19

LX-WZA012WREO Washer; turntable motor mtg. XBTSD40P08JOO Screw; stub mtg.

1 AA 1 AA

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER

2. REF. NO.

3. PART NO.

4. DESCRIPTION

( RDP1303LJ)

R4AlO R4A20 R4A30

CABINET PARTS

l-9

./y

f t

I f

.d ‘b

I ’

.’

j b;/

I ’ 9

;

0 4

2 -2

2- 7

I -

@Yl

i !

I I

I 2

I 3

I 4

I 6

R4AlO

R4A20

R4A30

1 2 3

OVEN PARTS

2-15

2 I

3 4 I

5 I

R4AlO RQAPO

R4A30

1 2 I 3 I

/ 4 5

I 6

CONTROL PANEL PARTS

3-3

DOOR PARTS

/-\

I I I

I I

3-6

MISCELLANEOUS

‘-7

6-7- %%a

cla

6-12 0

R4AlO R -4A20 R4A30

PACKING AND ACCESSORIES

TURNTABLE TRAY

ROLLER STAY

OPERATION MANUAL

<a-

COOK BOOKLET

DOOR PROTECTION SHEET

0 (SPA DPO336W R EO)

SHRINK FILM SHEET

TRAY HOLDER

# (SPADFA049WREO)

ACCESSORIES ASSENBLY

S 6

PACKING ADO KIT

l Not Replaceable items

I 2

I 3

__)

‘88 0 SHARP CORP. (8N0.75E) Printed in Australia

Sharp R-4A10, R-4A20, R-4A30 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual