Sharp R-4A52, R -4, E52, R-4E52 Service Manual

R -4A52 R-4E52

SHARP SERVICE MANUAL

S0005R4A52PJZ

I’

MICROWAVE OVEN

MODELS

R-4A52

Photo R-4A52

R -4,E52

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

condition and only manufacturer original spare parts must be used.

TABLE OF CONTENTS

GENERAL IMPORTANT INFORMATION

Page

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

1

CAUTION, MICROWAVE RADlATION,WARNING ......................................................................................

PRODUCT SPECIFICATIONS

1

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

APPEARANCE VIEW 2 ........................................................................................................................................

OPERATION SEQUENCE 3 .................................................................................................................................

FUNCTION OF IMPORTANT COMPONENTS

4

SERVICING

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

5

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

TEST PROCEDURE

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

7

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

TOUCH CONTROL ASSEMBLY

10

COMPONENT REPLACEMENT AN’~..~~J.USTM’ENT.PR.O.~E.~UR E ..IIII:::::::I::::::::::::::::::::I:::IIIII::::::Il::::

17

MICROWAVE MEASUREMENT

23

TEST DATA AT A GLANCE

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

30

WIRING DIAGRAM

................................................................................. -.

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

31

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

PICTORIAL DIAGRAM

.

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

32

...

....

CONTROL PANEL CIRCUIT

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

34

. .

PRINTED WIRING DIAGRAM

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

36

PARTS LIST

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

38

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

PACKING AND ACCESSORIES

39

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

45

SHARP CORPORATION

R-4A52 R-4E52

SERVICE MANUAL

SHARP

MICROWAVE OVEN

R-4A521 R-4E52

GENERAL IMPORTANT INFORMATION

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

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

CAUTION

MICROWAVE RADIATION

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

WARNING

Never operate the oven until the following points are

ensured.

(A)The door is tightly closed. (B) The door brackets and hinges are not defective. (C)The door packing is not damaged. (D)The door is not deformed or warped. (E) There is not any other visible damage with the oven.

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

All the parts marked

“*Il on parts list are used at voltages

more than 25OV.

SHARP CORPORATION

OSAKA, JAPAN

1

= .” PRODUCT SPECIFICATIONS

.r*&, “7:

OPERATING SEQUENCE

TROUBLESHOOTING CHAR

TEST PROCEDURE

TEST DATA TABLE AND TEST POINTS ON CONTROL

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PRINTED WIRING BOARD

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,d PARTS LIST “yb

R -4A52 R-4E52

PRODUCT SPECIFICATIONS

SPECIFICATION

ITEM

Power Requirements

_-

Power Consumption Power Output

____

Outside Dimensions

Cooking Cavity Dimensions

Turntable diameter Control Complement

Set Weight

DESCRIPTION

240 Volts 50 Hertz Single phase, 3 wire earthed

14oow

’ 750 watts nominal of RF microwave energy (2 liter water load)

Operating frequency of 2450M Hz

-

’ Width 550mm

Height 312mm

‘-Depth 417mm for R-4E52

420mm for R-4A52

Width 381 mm

1 Height 210 mm

Depth 411 mm 360mm Touch Control System

Clock( 1 :OO - 12:59 ) Timer (0 - 99 minutes 99 seconds ) Microwave Power for Variable Cooking

Repetition Rate;

HIGH *.........*....................*.

Full power throughout the cooking time

MEDIUM

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

approx.

70% of Full

Power

MEDIUM

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

MEDIUM LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

approx.

30% of Full Power

LOW

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

approx. 10% of Full Power

For R-4A52

For R-4E52

AUTO COOK

INSTANT ACTION

EASY REHEAT

EASY DEFROST

DOUBLE QUANTITY

INSTANT COOK/START

TRIPLE QUANTITY

MEMORY

AUTO START/CLOCK

POWER LEVEL

VARIABLE COOKING CONTROL

NUMBER

INSTANT COOK/START

STOP/CLEAR

Approx. 17.0 kg

2

:.

APPEARANCE VIEW

R-4A52 R-4E52

1.

Ventilation

openings

8. Touch Control Panel

2. Oven lamp

9. Digital readout

3. Hinges

10. Waveguide cover

4. Safety door latches 11. Access cover for oven lamp replacement

5. See through door

12. Power supply cord

6. Coupling

13. Roller Stay

7. Door open

button

14. Turntable

i

Touch Control Panel for R-4A52

AUTO COOK MENUS

1

NUMBER PADS

clock trme. wecght or quantrty of food, or to select the Auto Cook or Easy Reheat menus.

VARIABLE COOKING CONTROL PADS

Touch to select microwave power settmg. ff not touched, HIGH is automatrcally selected.

STOP/CLEAR PAD

Touch to erase during programming. Touch once to stop operatron of oven during cookmg; touch lwce to cancel cookrng pro---gramme.

- EASY REHEAT PAD Touch to select EasV Reheat mode.

-EASY REHEAT MENUS

-EASY DEFROST PAD Touch to defrost meat by entering weight.

. MEMORY

Touch to enter one frequently used cookmg programme. Touch to recall the memonzed programme.

‘MOREI n I. LESS( v 1 PADS

Touch to increase/decrease the time in one mcnute mcrements during cookmg or to increase/decrease the trme whrlst programmrng the Easy Reheat, Auto Cook or Easy

Defrost modes.

INSTANT COOK/START PAD

Touch once to cook for 1 mmute at HIGH or Increase by 1 mrnute multrples each trme this pad IS touched during

cookmg. Touch to start oven after settmg programmes.

*Place the roller stay on

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

Touch Control Panel for R-4E52

7 INSTANT ACTION -

INSTANT ACTION PADS

Touch once to cook or reheat 10 popular menus

entenng weight.

touchmg the INSTANT ACTION

pad.

wL2zl(I 111

-TRIPLE QUANTITY PAD To cook triple quantrty, touch this pad prior to touchrng the INSTANT ACTION pad.

I INUMBER PADS

Touch to enter weight, cookrng and clock trmes

Touch to select cooking power control settmg.

AUTO START/CLOCK PAD

Touch to set clock or Auto Start trme.

‘INSTANT COOK/START PAD

Touch once to cook for 1 minute at HIGH or increase by 1 minute multiples each trme thus pad IS touched dunng cookmg. Touch to start oven after setting programmes.

J

L STOP/CLEAR PAD

Touch to erase during programming. Touch once to stop operatron of oven dunng cookrng; touch twrce to cancel cooking programme.

R-&u2 R-4E52

OPERATING SEQUENCE

OFF CONDITION

Closing the door activates all door interlock switches

(Upper latch switch,

Lower latch switch and stop

switch)

IMPORTANT

When the oven door is closed, the monitor switch contacts COM-NC must be open. When the microwave oven is pluged in a wall outlet

(240V 50Hz), 240 volts A.C. is supplied to the point

Al + A3 in the control unit.

Figure O-l on page 32 or 33

1 . The display flashes “88:88”. --

2. To set any programmes or set the clock, you must first touch the STOP/CLEAR key.

3. [lappears in the display and the time counts up every minute.

NOTE: When the oven door is opened, the oven

lamp comes on at this time.

MICROWAVE COOKING CONDITION

HIGH COOKING

Enter a desired cooking time with the touching NUMBER key and start the oven with touching

START key.

Function sequence Figure O-2 on page 32 or 33

CONNECTED COMPONENTS

RELAY

Oven lame, Fan motor, Turntable motor

RYI

Power transformer

RY2

1. 240 volts AC. is supplied to the primary winding of the power transformer. The voltage is converted to about 3.3 volts AC. output on the filament winding and high voltage of approximately 2000 volts A.C. on the secondary winding.

2. The filament winding voltage (3.3 volts) heats the magnetron filament and the high voltage (2000 volts) is sent to the voltagedoubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C..

3. The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channeled through the waveguide

(transport channel) into the oven cavity, where the

food is placed to be cooked.

4. When the cooking time is up, a signal tone is heard and the relays RYI + RY2 go back to their home

position.

The circuits to the oven lamp, power transformer, fan motor and turntable motor are cut off. When the door is opened during a cook cycle, the switches come to the following condition.

CONDITION

DURING

DOOR OPEN

SWITCH CONTACT

COOKING (NO COOKING)

Upper latch switch COM - NO Closed

Open

Monitor switch

COM- NC

Open ’ Closed

Lower latch switch COM - NO Closed

Open

Stop switch

COM- NO Closed

Open

The circuits to the power transformer, fan motor and turntable motor are cut off when the upper latch switch, and stop switch are made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay RYI stays closed. Shown

in the display is the remaining time.

MONITOR SWITCH CIRCUIT

The monitor switch SW3 is mechanically controlled

by oven door, and monitors the operation of the upper and lower latch switches SW1 + SW2.

6-2

When the oven door is opened during or after the cycle of a cooking program, the upper latch and

lower latch switches SW1 + SW2 must open their

contacts first.

After that the contacts (COM NC) of the monitor switch SW3 can be closed and then contacts of the stop switch SW4 can be opened. When the oven door is closed, the contacts

(COM-

NC) of the monitor switch SW3 must be opened first, and the contacts (COM - NO) of the stop switch SW4 must be closed. After that the contacts of the upper latch switch SW1 latch and lower latch switches SW1 + SW2 are closed.

6-3. When the oven door is opened and the contacts

of the upper and lower latch switches SW1 + SW2 remain closed. The fuse E M8A will blow, because the monitor switch is closed and a short circuit is caused.

4

R-4A52 R-4E52

MEDIUM HIGH, MEDIUM, MEDIUM LOW,

SETTING

LOW COOKING

When the microwave oven is preset for variable cooking power, 240 volts A.C. power is supplied to the power transformer intermittently within a 32-second time base through the’relay contact which is coupled with the current-limiting relay RY2.

The following

levels of microwave power are given.

HIGH

MEDIUM HIGH

MEDIUM

MEDIUM LOW

LOW

32 sec. ON

24 sec. ON 8 sec. OFF

-1 Approx. 70% = 525 Watts

lEsac.ON 14 sec. OFF

m-1 Approx. 50% = 375 Watts

12secON 20 sec. OFF

m-1 Approx. 30% = 225 Watts

6 sec. ON 26 sac. OFF

m------j Approx. 10% = 75 Watts

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

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

heating up the magnetron filament.

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

The door can be opened by pushing the door open button on the control panel. When the door open button is pushed, the latch lever 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.

.LATCH MONITOR

HOOK \

, SWITCH

DOOR

LATCH

HEAD

KE

SWITCH

I

-. -.

SWITCH

LOWER

kGGON~ L -s-w:T:! _ _ /

--7

Figure D-l. Door Open Mechanism

UPPER LATCH SWITCH SW1 LOWER LATCH SWITCH SW2

STOP SWITCH SW4

1. When the oven door is closed, the contacts (COM - NO) must be closed.

2. When the oven door is opened, the contacts (COM - NO) must be opened.

M’ONITOR SWITCH SW3

1. When the oven door is closed, the contacts

(COM- NC) must be opened.

2. When the oven door is opened, the contacts

(COM - NC) must be closed.

3. If the oven door is opened and the contacts (COM -

NO) of the upper and lower latch switches SW1 + SW2 fail to open, the fuse E M8A blows simultaneously with closing the contacts (COM- NC) of the monitor switch SW3

CAUTION: BEFORE REPLACING A BLOWN FUSE F

M8A TEST THE UPPER AND LOWER LATCH SWITCHES SW1 + SW2 MONITOR SWITCH SW3 AND MONITOR RESISTOR FOR OPERATlON.(:EFER TO

PROPER

CHAPTER

“TEST PROCEDURE”.)

MONITOR RESISTOR- R 0.8 Q 20W

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

THERMAL CUT-OUT TC 145°C (OVEN)

The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by unproper setting of cook time or failure of control unit.

Under normal operation, the oven thermal cut-out re-

mains closed. However, when abnormally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 145”C, causing the oven to shut down.

The thermal cut-out TC will be close its contacts again

when its temperature goes down lower than -20°C.

5

R-4A52 R-4E52

FUSE _E M8A 250A

1. If the wire harness or electrical components are short-circuited, this fuse blows to prevent an elec-

tric shock or fire hazard.

2. The fuse blows when the asymmetric rectifier, H.V. rectifier,

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

3. The fuse also blows when upper and lower latch switches SW1 + SW2 remains closed with the oven door open and when the monitor switch SW3 closes.

TEMPERATURE FUSE E 150”C(MG)

This fuse protects the magnetron against overheating.

If the temperature goes up higher than 150°C because the fan motor is interrupted, the air inlet duct is blocked or the ventilation openings are obstructed, the fuse blows and puts the oven out of operation. The defective fuse must be replaced with new rated one.

TURNTABLE MOTOR

The turntable motor drives the turntable roller assembly to rotate the turntable.

FAN MOTOR

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

ASYMMETRIC RECTIFIER

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

*qlG” VOLTAGE RECTIF,ER

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

(The process of blowing the fuse E M8A.)

1.

2.

3.

4.

5.

6.

7.

The high voltage rectifier is shorted by any causes when microwave cooking. The peak reverse voltage of D2 of the rectifier goes

beyond the rated peak reverse voltage 1.7 KV in the

voltage doubler circuit.

D2 of the rectifier is shorted. The large electric currents flow through the high voltage winding of the power transformer.

The large electric currents beyond 8A flow through the primary winding of the power transformer. The fuse E M8A blows by the large electric currents. The power supply to the power transformer is cut off.

NOISE FILTER (For New Zealand Model)

The noise filter prevents the radio frequency interference that might flow back in the power circuit.

R-4A52 R-4E52

SERVICING

WARNING TO SERVICE PERSONNEL

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

REMEMBER TO CHECK 3D

REMEMBER TO CHECK 4R

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor. WARNING AGAlNST THE CHARGE OF THE

HIGH-VOLTAGE CAPACITOR

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

4) Run the oven. Check all functions.

The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit

the connection of

the high-voltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

Microwave ovens shouid not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power level to

HIGH. And set the timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water

remains cold carry out 3D checks and re-examine

Sharp

recommend

that

wherever possible

the connections to the component being tested.

faultifinding is carried out with the supply.disconnetted. It may in,

some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 30 checks and then disconnect the leads to the pnmary of the power

transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use

insulation tape if necessary.) When the testing is

completed carry out 3D checks and reconnect the

leads to the primary ofihe power transformer.

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

TROUBLESHOOTING GUIDE

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 wiil be found in the “Test Procedure”section.

IMPORTANT: If the oven becomes inoperative be-

cause of a blown fuse E (M8A) in the

upper latch switch - lower latch switch - monitor switch - monitor resisitor circuit, check the lower latch switch, monitor switch and monitor resistor before replacing the fuse E

(M8A).

7

R-4A52 R-4E52

NOTE: “0” means direct cause and part. “A” means indirect cause and part.

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PROBLEM

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Home fuse blows when power supply cord is plugged into wall outlet.

Fuse M8A blows when power supply cord is plugged into wall receptacle.

0 0

88 : 88 does not appear in display but

OFF CONDITION

power supply cord is plugged into wall

0

outlet. Display does not operate properly when

STOP/CLEAR pad is touched. Oven lamp does not light at door

opened. (Display appears.) Oven does not start when START pad

is touched. (Display appears.)

0 0

Oven lamp does not light. (Display appears.)

Fan motor does not operate. (Display appears.)

0

Turntable motor assembly does not operate. (Display apears.)

0

Oven or any electrical parts does not stop. But cooking time is 0 or STOP/CLEAR pad is touched.

IN :ONDITION

Oven seems to be operating but little or no heat is produced in oven load. (Micro-

000 00 0

wave power level is set at HIGH.) Oven does not seem to be operating

properly when MEDIUM HIGH, MEDIUM, MEDIUM LOW or LOW is set. (Oven operates properly at HIGH and then the STOP/CLEAR pad is touched the oven stops.)

Oven goes into cook cycle but shuts down before end of cooking cycle.

Oven stops as soon as when the START pad is touched.

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8

R -4A52 R-4E52

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R -4A52 R-4E52

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

MAGNETRON TEST

-----. -

-

j NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED

I

1 TOOL WHILE THE OVEN IS IN OPERATION.

CARRY OUT 3D CHECKS

Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament

terminal.

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

magnetron filament terminals, the meter should show a reading of less than 1 ohm.

To test for a short circuit filament to anode condition, connect ohmmeter between one of the filament terminals and the case of the magnetron (ground). This test should be indicated an inifinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER

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

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

1 The formulae is as follows; I

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: Room temperature . . .

around 2O”C, Power supply Voltage . . . 240 volts.

Water load . . .

2000 ml, Initial temperature . . . 1 O&l OC, Heating time . ..I min. 52 sec.

P = 75 x AT

Measuring method:

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

B) Place 1 litre of 10°C water in each beaker. C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the

temperature of water the thermometer and note them. The graduation of the thermometer must be scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended.

Example: The initial temperature Tl = 1 O’C, T2 = 11 “C

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

temperature 10 degrees C.)

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

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

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

water with the thermometer and noting the readings.

10

R-4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

Example: Tl = 20°C, T2 = 21 “C

initial temperature

~~

Temperature after 1 min. 52 sec. Temperature difference Cold-Warm

---

Mean temperature rise LIT

i

T T

Measured output power

The equation is as follows:

P= 75 x AT

Tl

‘=lO”C T2=11”C

I

Tl = 20°C T2 = 21 “C

,!LTl =lO”C LIT~=IO”C /

-------------,

LIT = (LIT1 + LLT2) / 2

!

= (10°C + IOOC) / 2

j

= 10°C

P= 75 x 10°C

= 750 Watts

-I

NOTE:

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

CAUTION: 1 “C CORRESPONDS TO 75 WATTS.

REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

(Tl OC)

lT2 OC)

(T2 OCI

Heat up for 1 min. 52 sec.

B

POWER TRANSFORMER TEST

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

and filament winding of the power transformer. It is very dangerous to

work near this part when the oven is on.

NEVER make any voltage

measurements of the high-voltage circuits, including the magnetron

filament.

CARRY OUT D CHECKS.

Disconnect the leads to the primary winding of the power’transformer.

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

should be obtained :-

a. Primary winding ------b.

---l .42 ohms approximately.

Secondary winding - - - - - - -78.9 ohms approximately.

c. Filament winding ---------less than 1 ohm.

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

should be replaced.

CARRY OUT 4R CHECKS

11

R-4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

C

HIGH VOLTAGE RECTIFIER ASSEMBLY TEST

HIGH VOLTAGE RECTIFIER TEST

CARRY OUT 3D CHECKS.

Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be

tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal

B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is intinte in one direction and mor than 100 kQ in the other direction.

CARRY OUT 4R CHECKS

ASYMMETRIC RECTIFIER TEST

CARRY OUT 3D CHECKS.

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

is good. If an asymmetric rectifier is shorted in either direction, then the the asymmetric rectifier is probably faultly and must be replaced with the high voltage rectifier. When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage wire or filament winding of the power transformer is shorted.

CARRY OUT 4R CHECKS

* +z$“:H “OLTAOE

RECT,F,ER

C

NOTE:

FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLYAGE AT LEAST 6 VOLTS, BECAUSE O*THERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.

D

HIGH VOLTAGE CAPACITOR TEST

CARRY OUT 3D CHECKS.

A.

Isolate the high voltage capacitor from the circuit.

B.

Continuity check must be carried out with measuring instrument which is set to the highest resistance range.

C.

A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10 Mf2 after it has been charged.

D.

A short-circuited capacitor shows continuity all the time.

E.

An open capacitor constantly shows a resistance about 10 MO because of its internal 10

MO resistance.

F.

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

G.

The resistance across all the terminals and the chassis must be inifinte when the capacitor is normal.

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

CARRY OUT 4R CHECKS

12

R -4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

E SWITCH TEST

CARRY OUT 3D CHECKS.

Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.

Table: Terminal Connection of Switch

Plunger Operation

Released

Depressed

COM to NO

COM to NC

O.C. S.C.

_--- ---

S.C. O.C.

COM; Common terminal

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

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

CARRY OUT 4R CHECKS.

F NOISE FILTER TEST

CARRY OUT 3D CHECKS

Disconnect the leads from the terminal’

of the noise filter.

WHT

N*

0

g--Q

Using an ohmmeter, check between the terminals as described in the following table.

L hinl

Cx*ZO% CvtZmb

1.0 mti

0.066,lF 22OOpF

MEASURING POINTS

Between N and L

/ INDICATION OF OHMMETEf2i 1

I Open circuit

I I

1 Between terminal N and WHITE

Short circuit

I I

-..-----4

Between terminal L and RED Short circuit

---

----l

If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS

MONITOR RESISTOR TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the monitor resistor.

-<

Using an ohmmeter and set on a low range. .

Check between the terminals of the monitor resistor as described in the following table.

Table: Resistance

Resistor

Resistance

Monitor resistor Approx. 0.8R

If incorrect readings are obtained, replace the monitor resistor,

CARRY OUT 4R CHECKS.

13

R -4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER COMPONENT TEST

H

TEMPERATURE FUSE OR THERMAL CUT OUT TEST

CARRY OUT 3D CHECKS

Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an

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

CARRY OUT 4R CHECKS

Table: Temperature Fuse Test

Parts F-ame

Temperature of Temperature of Indication of

“ON” condition . “OFF” condition ohmmeter

(closed circuit).

(open circuit). (When room

(“Cl

temperature is

approx. 20°C.)

Temp. fuse 1 50°C

(Magnetron)

Thermal cut-out 145°C (Oven)

This is not resetable

Above 1 50°C Closed circuit

type.

- 20°C

Above 145’C Closed circuit

If incorrect readings are obtained, replace the temp. fuse or thermal cut-out. An open circuit temperature fuse (MG) indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out (OVEN) indicates that the foods in the oven catch fire, this may be due to over heating produced by unproper setting of the cooking timer or failure of the control panel.

MOTOR WINDING TEST

CARRY OUT 30 CHECKS

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

Table: Resistance of Motor

1 Motors

I

Resistance

i F an motor

1 Approximately 246f2

1 Turntable motor

1 Approximately 12.5kn

If incorrect readings are obtained, replace the motor. (Also refer to test procedure J)

CARRY OUT 4R CHECKS

14

R -4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

J

LIVE TEST FOR MOTOR WINDINGS

CAUTION: The following procedure requires the oven to be connected to the supply

1.

2.

3.

4.

5.

6.

7.

8.

9.

and should only be used if the relevant “cold” checks for the motor under test are inconclusive.

CARRY OUT 3D CHECKS

Disconnect the leads from the primary of the power transformer. Make sure that the leads remain isolated from other oven components and chassis. (Use insulation tape if necessary.) Connect a voltmeter, set to 250V AC, across the motor terminals. (Refer to the relevant motor test procedure or pictorial diagram for the correct terminal numbers.) Arrange the meter in a position where it can be read during the test. (Do not touch the meter, meter leads or oven circuitry while the oven is active.) Close the oven door. Set the power level to HIGH and set the relevant timer for about three (3) minutes. Note the reading on the meter and carefully observe the motor under test to see if it is turning. CARRY OUT 3D CHECKS Remove test meter leads.

1 O.Reconnect the leads to the primary of the power transformer.

If a reading of the line voltage was obtained (step 7) but the motor was not turning then it is

faulty and should be replaced. If the meter indicated that no supply was present then the wiring

I

to the motor should be checked for continuity.

K BLOWN FUSE F M8A

CARRY OUT $J CHECKS

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

2. If the fuse E M8A is blown, there is a short in the asymmetric rectifier or there is a ground in wire harness. A short in the asymmetric rectifier may be occured due to short or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and replace the defective parts or repair the wire harness.

3. If the fuse E M8A is blown when the door is opened, check the upper latch switch, monitor

switch, lower latch switch and monitor resistor.

If the fuse E M8A is blown by incorrect door switching replace the defective switch(s) and

the fuse E M8A.

CARRY OUT 4FJ CHECKS

-&

CAUTION\ Only replace fuse E M8A with the correct value replacement

15

R-4A52 R-4E52

TEST PROCEDURES (CONT’D)

PROCEDURE

LETTER

COMPONENT TEST

TOUCH CONTROL PANEL ASSEMBLY TEST

M

The touch control panel consists of circuits including semiconductors such as LSI, lCs, 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 all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.

2. Control Unit

The following symptoms indicate a defective control unit. Replace the control unit.

2-l In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. 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.

PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN.

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

primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.

Problem: POWER ON, indicator does not light up.

STEPS

F---l-

OCCURANCE

CAUSE OR CORRECTION

-I

1

The rated voltage is not applied to POWER terminal Check supply voltage and oven main unit.

I

’ of CPU connector (CN-A)

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

transformer.

Check and repair.

3

Only pattern at “a” is broken.

*Insert jumper wire 34 and solder.

4 Pattern at “a” and “b” are broken.

*insert the coil RCILF2003YAZZ between “6 and “d”.

/v=1L/voom wti* .

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

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

If any abnormal condition is detected, replace

the defective parts.

16

R-4A52 A-4E52

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.

Key Unit

The key unit is composed of a matrix, signals generated

in the LSI are sent to the key 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.

1)

a

3)

LSI

This LSI controls the 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

VDD -12v

LSI (ICY), ACL circuit VREF VP

~~i:“V LSI (ICI)

Fluorescent display tube : Grid VF+

and anode voltage.

3V P-P F$rrenent of fluorescent display

VF- (VF+ to VF- 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.

4)

5)

6)

7)

8)

ACL Circuit

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

Buzzer Circuit

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

LSI

and

Door Sensing Switch

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

Relay Circuit

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

Indicator Circuit

Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is a triode having

I

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

I

17

R -4A52 R-4E52

DESCRIPTION OF LSI

LSI( IZA312DR)

The I/O signals of the LSI(IZA312DR) are detailed in the following table,

PIN NO.

/ 1

__ ----

__-.--

1 SIGNAL 1 T

I

l/O

j OUT ’

Signal to sound buzzer.

A: Key touch sound (0.12 sec.). 6: Completion sound (2.4 sec.).

PIN NO. j 2

1 SIGNAL / VDD

------

- _____

Power source voitaqe: -12V

VDD voltage of power source circuit input.

I

l/O

/ IN

PIN NO. i 3

I.-SIGNAL / VREF

I

l/O

IN

A-_-

Reference voltace input terminal.

‘A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintained at -6.15V

PIN NO.

i 4

~~-.-.-.-_I_

1 SIGNAL j VP

I

I/O

/ IN

I

Anode (segment) of Fluorescent Displav illumination voltaqe: -27V

Vp voltage of power source circuit input.

PIN NO.

1 5

1 SIGNAL / INT

I

I/O

IN

Signal svnchronized with commercial source frequency(50Hz).

This is the basic timing for time processing of LSI.

PIN NO.

/ 6

1

SIGNAL 1 CNVSS

I

I/O

1 IN

_--

_______- -

Power source voltage input terminal.

Connected to GND.

PIN NO. / 7-10

1 SIGNAL / FO-F3

I

I/O

1 OUT

Segment 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.

PIN NO. 1 11

1 SIGNAL / SO

I

I/O

1 OUT

Segment data signal.

Signal similar to FO.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to K4-K7 terminal while one of D-8 line keys on key matrix is touched. Terminal not used.

PIN NO. 12

Segment data signal.

Signal similar to FO.

Key strobe signal.

1 SIGNAL j Sl

I

I/O

/ OUT

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.

18

R-4A52 R-4E52

PIN NO. ,

j 13

1 SIGNAL 1 S2

I

I/O

j OUT

Segment data signal.

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-6 line keys on key matrix is touched.

PIN NO.

I 14

SIGNAL S3

I

I/O

/ OUT

Segment data signal.

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-5 line keys on key matrix is touched.

PIN-NO. 1 15

1 SIGNAL / S4

I

I/O

OUT

Segment data signal.

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-4 line keys on key matrix is touched.

-

PIN NO.

1 16

1 SIGNAL 1 S5

I I/O j OUT

Segment data signal.

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-3 line keys on key matrix is touched.

PIN NO. 1 17

-Seclment data siqnal.

1 SIGNAL / S6

I

I/O

1 OUT

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.

PIN NO. j 18 1 SIGNAL j 57

I

l/O

/ OUT

-____

Senment data siqnal.

Signal similar to FO.

Key strobe signal.

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.

PIN NO. / 19

1 SIGNAL / XOUT

I.. I/O

1 OUT

_----

liiternal clock oscillation freduencv control output.

Output to control oscillation input of XIN.

PIN NO. 1 20

1 SIGNAL / XIN

I

I/O / IN

___---___-

Internal clock oscillation frequency input setting.

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

PIN NO. / 21

1 SIGNAL j VSS

I

I/O

I IN

-

Power source voltage input terminal.

Connected to GND.

19

R -4A52 R-4E52

PIN NO.

j 22-24 SIGNAL / Dll-D9

I

I/O

/ OUT

Diqit selection siqnal.

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. j 25-27

.I SIGNAL i D8-D6

I I/O

1 OUT

Diqit selection siqnal.

Signal similar to Dl I.

PIN NO. / 28

Seqment data siqial.

Signal similar to FO.

1 SIGNAL / D5

I

I/O

/ OUT

PIN NO. 1 29-31

1 SIGNAL 1 D4-D2

I

I/O

/ OUT

Terminal not used.

PIN NO. 1 32

1 SIGNAL j Dl

Maqnetron Hiqh-voltaqe circuit drivinq siqnal.

To turn on and off the cook relay.

I

I/O

1 OUT

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.

PIN NO. / 33

I

1 SIGNAL 1 DO

I

I/O

1 OUT

&en lamp, turntable motor and coolinq fan motor drivinq siqnal. (Square Waveform: 50Hzl

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

I

c--7

v----c

----------H

L-LA--

d-.-d-

L

PIN NO. j 34

Auto clear terminal.

1 SIGNAL ) RESET

I

I/O

/ IN

I

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.

PIN NO. 35

I

1 SIGNAL 1 K7

I

l/O

1 IN

Sinnal coming from touch key.

When either one of D-9 line keys on key matrix is touched, a correspondin signal out of SO-S6 will be input into K7. When no key is touched, the signal is held at “L” level,

20

R -4A52 R-4E52

PIN NO.

_-_- --_--

i-36

1 SIGNAL 1 K6

~-

L I/O 1 IN

_-__--_______

Signal cominq from touch key.

When either one of D-10 line keys on key matrix is touched, a corresponding signal will be input into K6.

PIN NO. i 37

1 SIGNAL j K5 1 I/O j IN

Sianal coming from touch key.

When either one of D-l 1 line keys on key matrix is touched, a corresponding signal will be input into K5.

PIN NO. / 38

1 SIGNAL j K4 IN

--___~

Signal coming from touch key.

When either one of D-l 2 line keys on key matrix is touched, a corresponding signal will be input into K4.

PIN NO. 39

1 SIGNAL j K3

I

I/O

( IN

--_

Terminal not used.

PIN NO. / 40

SIGNAL j K2

I

I/O

/ IN

Input signal which communicates the do&r open/close information to LSI.

Door closed; “H” level signal.

Door opened; “L” level signal.

PIN NO. 1 41

1 SIGNAL 1 Kl

I

I/O

1 IN

Terminal not used.

PIN NO. 1 42

1 SIGNAL / KO

Terminal not used. Connected to GND.

I/O

I I IN

-I_---_---

21

R-4A52 R-4E52

SERVICING

I. 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)

2)

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

in the figure and

soldering iron and work table.

use grounded

boards contaf-ning them in

2. Shapes of Electronic Components

Transistor DTA 143ES

Transistor 2SB910M

L

DTC 114ES DTD 143ES

3. 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 OF THE MICROWAVE OVEN IS STILL ALIVE TO GIVE YOU DANGER DURING SERVICING.

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 connector shall be insulated with an insulating

tape.

After servicing, be sure

leads

to their original locations.

to replace the

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.

4. Servicing Tools Tools required when servicing the touch control

panel assembly.

1) Soldering iron: 30W (To prevent leaking cur-

rent, it is recommended to use a soldering iron with

a grounding terminal.)

2) Oscilloscope:

Single beam, frequency range:

DC - IOMHz type or more ad-

vanced model.

3) Others: Hand tools

5. Other Precautions

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,

B. 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 an operational state that is equivalent 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).

1) Before turning on the power source of the control 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.

3) 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.

22

R -4A52 R-4E52

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below

before oDerating the oven.

1. CARRY OUT 3D CHECKS.

2. Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the

door in a closed position with one hand, then push

the door open button with the other, this causes the

latch heads to rise, it is then possible to hear a “click” as the door switches operate.)

3. Visually check the door and cavity face plate for

damage (dents, cracks, signs of arcing etc.).

I. Door does not close firmly.

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

3. The door gasket or seal is damaged.

4. The door is bent or warped.

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

6. There are defective parts in the microwave generat-

ing and transmission assembly.

7. There is visible damage to the oven.

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

Do not operate the oven: I. Without the RF gasket (Magnetron).

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

Do not operate the oven if any of the following con-

3. If the door is not closed.

ditions exist;

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

Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

OUTER CASE REMOVAL

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

To remove the outer case, proceed as follows.

edge of case.

1. Disconnect oven from power supply.

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

2. Open the oven door and wedge it open.

free it from retaining clips on the cavity face plate.

5. Lift the entire case from the oven.

moved.

6. Discharge the HV capacitor before carring out any

N.B.; Step I,2 and 6 form the basis of the 3D checks.

further work.

CAUTION: DISCHARGE

7. Do not operate the oven with the outer case re-

HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)

To remove the components, proceed as follows.

1. CARRY OUT 3iJ CHECKS

2. Disconnect the high voltage wire A from the

7. Disconnect high voltage wire A and terminals of high voltage rectifier assembly from high voltage capacitor.

magnetron.

3. Disconnect the filament lead(shorter one) of the

8. Now high voltage rectifier assembly and capacitor

power transformer.

should be free.

I

4. Disconnect the high voltage wire of the H.V. rectifier assembly fromt he high’voltage capacitor.

5. Remove one (1) screw holding capacitor holder to

the oven cavity.

6. Remove one (1) screw holding earth side terminal of high voltage rectifier assembly, and remove capacitor holder from the high voltage capacitor,

CAUTION: W-HEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT

THE CATHODE (EARTH) CONNECTION

IS SECURELY FIXED TO THE CAPACITOR HOLDER WITH A EARTHING SCREW.

POWER TRANSFORMER REMOVAL

1. CARRY OUT3JCHECKS

4. Disconnect the high voltage wire of H.V. rectifier

2. Remove the fan motor assembly from the oven re- assembly from the power assembly.

ferring to “FAN MOTOR ASSEMBLY”.

5. Remove the two (2) screws holding the transformer

3. Disconnect the the filament lead of the power

to bottom plate right.

transformer from high voltage capacitor.

6. Remove the transformer from the bottom plate right.

7. Now, the power transformer is free.

23

R-4A52 R-4E52

MAGNETRON REMOVAL

1. CARRY OUT 3D CHECKS

2. Disconnect the H.V. wire A and filament lead(longer one) of the transformer from the magnetron.

3. Release the main harness from the tabs of the air duct.

4. Remove the air duct from the oven cavity.

5. Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws holding the magnetron to prevent it from

falling.

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

7. Remove the magnetron cushion from the magnetro. CAUTION: WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN

PLACE AND

THE

MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.

CONTROL PANEL REMOVAL

1. CARRY OUT 3D CHECKS

-_

2. Disconnect the main harness and low voltage harness from the control panel.

3. Remove the single (1) screw holding the control panel to the oven cavity.

4. Lift up the control panel assembly and pull it forward. Now, the control panel assembly is free,

TURNTABLE MOTOR REMOVAL

I. Disconnect the oven from power supply.

2. Remove the turntable motor cover by removing the two (2) screws.

3. Disconnect the wire lead from turntable motor and

remove the two(2) screws holding the turntable

motor.

4. Remove the O-ring and washer from the turntable motor.

5. Turntable motor is now free.

XFTSD40PlOOOO

Figure C-l.

NOTE: The two (2) screws holding the turntable motor

to the oven cavity must be used the specified

screws(XFPSD40P08000) as listed on Parts list.

TURNTABLE COUPLING. REMOVAL

1. Remove the turntable motor, refer to “Turntable Motor Removal”.

2. At the time turntable coupling will be free.

TURN TABLE

COUPLING

BOTTOM OVEN CAVITY

T.T. MOTOR

ANGLE

Figure C-2. Turntable Coupling

FAN MOTOR ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.

2. Disconnect the wire leads from the fan motor.

3. Disconnect the H.V. wire A and the filament

lead(longer one) of the power transformer from the magnetron.

5. Release the tabs of the fan duct from the holes in the bottom plate right and the back plate of the oven cavity.

6. Release the main wire harness from the hole in the

4. Release the H.V. wire A and filament lead from the

fan duct.

holes in the fan duct.

7. Now, the fan motor assembly is free.

24

R-4A52 R-4E52

OVEN LAMP SOCKET REMOVAL

1.

2.

3.

4.

5.

1.

2.

3.

4.

5.

6.

7.

CARRY OUT 3D CHECKS Lift up the tab holding the oven lamp socket. Remove the oven lamp socket.

Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the flat type small screw driver.

Now, the oven lamp socket is free.

Oven lamp socket

Flat type screw dri

Figure C-3. Oven lamp socket

UPPER LATCH SWITCH, LOWER LATCH SWITCH,

STOP SWITCH AND MONITOR SWITCH REMOVAL

CARRY OUT 3D CHECKS.

Remove the air duct from the oven cavity.

Disconnect the main wire harness and switch harness from the control panel.

Disconnect the leads from all switches.

Remove the two (2) screws holding the latch hook to the oven cavity. Remove the latch hook. Push the retaining tab slightly and remove the switch.

Monitor

I /

Upper latch switch

switch

Lower latch switch

Figure C-4. Switches

25

R -4A52 R-4E52

UPPER LATCH SWITCH, LOWER LATCH SWITCH,

STOP SWITCH AND MONITOR SWITCH ADJUSTMENT

If the lower latch latch switch, stop switch, upper latch

5. Reinstall outer case and check for microwave

switch and monitor switch do not operate properly due

leakage around the door with an approved micro-

to a mis-adjustment, the following adjustment should

wave survey meter.

(Refer to Microwave Measure

be made.

ment Procedure.)

1. CARRYOUT3DCHECKS

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

3. With 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. The horizontal position of the

latch hook should be placed where the stop switch and monitor switch have activated--with the door closed.

LATCH

The vertical position of the latch hook should be placed where the lower latch switch and upper

latch switch have activated with the door closed.

4. Secure the screws with washers firmly.

5. Make sure of the upper latch switch, stop switch, lower latch switch and monitor switch operation. If those switches have not activated with the door closed, two (2) screws holding latch hook to oven cavity front flange and adjust the latch hook position.

After adjustment, make sure of following:

1. In and out play of door remains less than 0.5 mm when latched position. First check latch hook position, pushing and pulling the door toward the oven

i

face. The results (plays of the door) should be less

I

than 0.5mm.

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

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

4. The stop switch contacts open when the door is opened.

Figure C-5 Latch Switches Adjustment

26

R -4A52 R-4E52

DOOR REPLACEMENT AND ADJUSTMENT

DOOR REPLACEMENT

1. CARRY OUT 3D CHECKS

2. Remove two (2) screws holding the lower oven hinge to the oven cavity. The lower oven hinge is now free.

3. ,“z;re the door assembly from the upper oven

4. Remove door assembly.

5. Door assembly is now free.

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

7. On re-installing new door assembly, secure the lower oven hinges with the two (2) mounting screws to the oven cavity. Make sure the door is parallel with bottom line of the oven face plate and

the latch heads pass through the latch holes cor-

rectly.

8. CARRY OUT JIFJ CHECKS

Note: After any service to the door, an approved

microwave survey meter should be used to

assure compliance with proper .microwave ra-

diation standards. ( Refer to Microwave Measurement Procedure.)

DOOR ADJUSTMENT

When removing and/or loosening hinges such as in 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 heads at a position where they smoothly catch the latch hook through the latch

1

holes. Refer to latch switch adjustments.

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

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

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

(Refer to Microwave Measure

ment Procedure.)

CABINET

Figure C-6. Door Assembly Replacement

and Adjustment

CHOKE COVER REMOVAL

1. Insert an iron plate(thrckness of about 0.5mm) or flat type screw driver to the gap between the choke cover and door panel as shown in the figure to free the engaging part.

2. Lift up the choke cover, now cover is free.

FLAT TYPE SCREW-DRIVER

PROTECT BY TAPE

FLAT TYPE SCREW-DRIVE

Figure C-7. Choke Cover Removal

DOOR PARTS REMOVAL

Remove the door assembly, referring to from item 1

through item 5 of “DOOR REPLACEMENT”.

1. Place the door assembly on a soft c,loth with latch

heads facing up.

2. Remove the.* choke cover, referring to “CHOKE COVER REMOVAL”.

LATCH HEAD REMOVAL

3. Lift up the latch head towards the direction that the

arrow shows in the figure C-8, and release the latch head from the holes in the door panel.

4. Release the latch spring with the latch head from

the tabs of the door panel.

5. Release the latch spring from the latch head.

6. Now, the latch head is free.

27

R-4A52 R-4E52

\

Tab of the door panel

Figure C-8. Latch head removal

Figure C-9. Latch head re-install

LATCH HEAD RE-INSTALL

1. Pick up the latch spring and catch the one ring of the latch spring on the tab of the door panel as shown in Figure C-9.

2. Catch the other ring of the latch spring on the tab of the latch head.

3. Install the latch head to the holes in the door panel.

POWER SUPPLY CORD REPLACEMENT

(FOR AUSTRALIA MODEL)

Removal

1. CARRY OUT 30 CHECKS.

2. Disconnect the brown wire of the power supply cord from the fuse holder.

3. Remove the connector CE-230 by cutting the connected wire leads to it.

4. Remove the single (1) screw holding the green/yellow wire of the power supply cord to the oven cavity.

5. Remove the single (1) screw holding the cord anchorage to the oven cavity.

6. Remove the power supply cord from the oven.

Re-install

1. Insert the power supply cord into the cord anchorages.

2. Connect the brown wire of the power supply cord to the fuse holder.

3. Install the green/yellow wire of the power supply cord to the oven cavity with the single (1) screw

tightly.

4. Make sure that the blue wire and the white wires

are stripped for 15 mm length as shown in Figure

C-II.

5. Wind the conductors of Blue and White wires each

other.

6. Insert the stripped wire leads into the connector

CE-230.

7. Clamp the connector CE-230 with the correct tool tightly.

Cord anchorage

I

Brown wire \

Fuse holder

Green/Yellow wire

Figure C-10 Power Supply Cord Replacement

for Australia Model

Blue wire of power supply cord

White wire of main harness

33::

Conductors

Connector CE-230

Figure C-II Wiring

28

FL4A52 R-4E52

POWER SUPPLY CORD REPLACEMENT

(FOR NEW ZEALAND MODEL)

Removal

1.

2.

3.

4.

5.

CARRY OUT 3D CHECKS

Loosen the two (2) screws holding the brown and blue wires of the power supply cord to the cord connector on the noise filter.

Loosen the single (1) screw holding the earth angle and earth wire of power supply cord.

Remove the single (1) screw holding the cord anchorages to the oven cavity.

Remove the power supply cord.

Re-install

1.

2.

3.

4.

5.

Insert the power supply cord into the cord anchorages.

Insert the brown and blue wires of power supply cord into the terminals of cord connector, referring to pictorial disgram. And tighten the screws. Insert the earth wire of power supply cord into the earth angle, and tighten the screw holding the earth angle.

Tighten the single (1) screw holding the cord

anchorages. CARRY OUT Q CHECKS

Note:Step 5 above is important, and it must be done

after replacing power supply cord.

Procedure

1. Pushing the lever of positive lock@ connecotr,

2. Pull down the connector from the terminal.

3. Now, the connector is free.

Note: If the positive lock@’ has a insulation sleeve, first

remove it. If you do not so, you can not push

the lever of positive lock@’ .

CAUTION: The positive lock@ terminal can not be

disconnected by only pulling. Because once you (Service personnal) have connected the positive lock@ connector to the

terminal, the positive lock connector has

been locked.

Cord connector

Blue wire

rem I Yellow wire

Figure C-12. Power Supply Cord Replacement

For New Zealand Model

Positive lock@ cunnector

\

Terminal

Figure C-13. How to release the

positive lock

connector

29

R -4A52 R-4E52

MICROWAVE MEASUREMENT

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

REQUIREMENT

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

PREPARATION FOR TESTING:

--

Before beginning the actual test for leakage, proceed

as follows;

1. Make sure that the test instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentations as prescribed by the per-

formance standard for microwave ovens must be

used for testing.

Recommended instruments are:

NARDA 8100 NARDA 8200 HOLADAY HI 1500

SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275 +I 5ml of water initially at 20f5”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 any leakage is measured accurately.

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

before the survey is completed, replace it with

275ml of cool water.

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

6. The microwave radiation emission should be meas-

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

surface of the oven.

Microwave leakage measurement at 5 cm distance

30

R-4A52 R-4E52

TEST DATA AT A GLANCE

IP

arts

1 Symbol 1 Value / Data

I---

F

Fuse

-

Monitor resistor

RI

Temp. fuse (MG)

TF

Thermal cut-out (OVEN)

TC

Oven lamp

OL High voltage capacitor Magnetron

Power transformer

C

MG

T

M8A 250V

0.8zT 20W 150°C 145°C

25W El4 250V

1 .I 3pF AC 21 OOV Filament < 1 n

Filament -

chassis 00 ohm.

Filament winding < 1 R

Secondary winding Approx. 78.9n

Primary winding Approx. 1.42231

TEST POINTS ON CONTROL UNIT

In/Out put terminal

Input (SUPPlY) input (Stop switch)

Output (Oven lamp

Fan motor, Turntable motor) Output (Power transformer) Output (Earth)

Resistance

Test point

Volt (Disconnect the power plug

and door is closed)

Al - A3 240V Approx. 9000

Bl- B2

OR

Al - A5

240V

98Q

Al - A7

240V 1 .7n

B2 - Chassis

Oil

WARNING: DISCONNECT THE PLUG WHEN MEASURING RESISTANCE.

31

14

240V-+OHr A

240V-50Hz

AC CORD CONNECTION BRN : BROWN BLU : BLUE G-Y : GREEN AND

YELLOW STRIPE

/lB : SECTIONAL AREA

OF 0.75mm2 MIN

I

l.DOOR CLOSED

j 2.~&O;;s;~~;ARS 1

.--

swi:

LfPPER LATCH SWITCi-

-

> i

I

l 1

AC CORD CONNECTION BRN :

BROWN BLU : BLUE G-Y : GREEN AND

YELLOW STRIPE

/lB : SECTIONAL AREA

OF 0.75mm2 MIN.

5w2: SE:

SWITCH

T: POWER

TRANSFOAMER

n

H.V. RECTIFIER

MG: MA-

Figure O-1 (a). Oven Schematic-OFF Condition For Australia Model

I

SCHEMATIC

YOTE: CONDITION

OF OVEN

l.DODR CLOSED

2.COOKING TIME PROGRAMMED

3.START KEY

TOUCHED

sw1: UPPER LATCH SWITCH

F: FUSE M0A

SW2

LOWER LATCH SWITCH

Figure O-2 (a).

v

Oven Schematic-ON Condition For Australia Model

240-6CiHz

BLU/lB m/10

pg-,

__~----_-_--_ L

LINE cR0ss

CAPACITOR

-( -7

(I

O.O68/‘(AC25OV

I I

0

F: FUSE

1

NOISE SVPPRESSION COIL

MBA

4

J;L

. !

1 1 NOISE SUPPRES;;“” COIL FE ] /

1

A !

LINE BYPASS

NOISE FILTER

AC CORD CONNECTION BRN :

BROWN BLU : BLUE G-Y : GREEN AND

AC CORD CONNECTION BRN : BROWN BLU : -BLUE G-Y :

GREEN AND YELLOW STRIPE

/lB : SECTIONAL AREA

OF 0.75mm2 MIN.

----------------+--I

YELLOW STRIPE /lB : SECTIONAL AREA

OF 0.75mm2 MIN.

3

TC: THERMAL CUT-OUT

143 (OVEN)

r-----

-----

1

7-!&--1 :j_ ql iikMGj

I.._.

UPPER LATCH SWITH

SWl:

UPPER

LATCH SWITH

SW2 LOWER LATCH SWITCH

SW3 MONITOR

R: MONITOR

SWITCH

RESISTOR

0. w2ow

SCHEMATIC

NOTE: CONDITION

OF OVEN

l.OOOR CLOSED

SW3 MONITOR

R: MONITOR

SWITCH

RESISTOA

0. w2ow

l.DOOR CLOSED

2.CLOCK APPEARS ON DISPLAY

2.COOKING TIMED PROGRAMMED

3.START KEY TOUCHED

I

I I

H.V. RECTIFIER

Figure O-2 (

b).

L------l

ffi: MAGbETRON

,

Figure O-l (b).

Oven Schematic-OFF Condition For New Zealand Model

Oven Schematic-ON Condition For New Zealand Model

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38

R-4A52 R-4E52

PARTS LIST

Note :

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

REF. NO. 1 PART NO.

I

DESCRIPTION

1 my ICODE

* *

ELECTRICAL PARTS

l- 1

QFS-TA014WREO TF: Temp. fuse 150°C (MG) 1 AG

l- 2

QFSHDA002WREO Fuse holder (For Australian Model)

1

AF

l- 3

QSW-MA009WREO SW3:

Monitor switch (V-5220D-070)

1

AF

l- 4

QSW-MA007WREO SWl: Upper latch switch (V-5230D-069) 1 AF

l- 5

RTHM-A057WREO TC: Thermal cut-out 145°C (OVEN) 1

AG

l- 6

QACCAAOllWREO Power supply cord (For Australian Model)

1

QACCAA018WREO Power supply cord (For New Zealand Model)

AQ

l- 6

AQ

l- 7

FW-QZA070WRKO H.V. rectifier assembly :: AY

l- 8

RC-QZA075WREO C: High Voltage capacitor

1 AU

l- 9

QSOCLAOllWREO Oven lamp socket

1

AH

l-10

RLMPTA029WREO OL: Oven lamp

1 AL

l-11

QFS-CAOlOWREO F: Fuse M8A

1

AE

l-12

FMOTEA212WRKO FM: Fan motor assembly fl~fl~~2/0~fi~0

1

l-13

RTRN-A288WREO T: Power transformer

1

BM

l-14

RV-MZA089WREO MG: Magnetron (For Australian Model)

1 BG

l-14

RV-MZA108WREO MG: Magnetron (For New Zealand Model)

1 BG

l-15

RMOTDA133WREO TTM: Turntable motor

1 AW

l-16

RR-WZA003WREO R: Monitor resistor 0.8 n 2OW

1

AG

l-17

QSW-MA007WREO SW2:

Lower latch switch 1 AF

l-18

QSW-MA007WREO SW4: Stop switch

1 AF

l-19

FPWBFA221WRKO Noise filter (For New Zealand Model)

1 AX

CABIN ET PARTS

2- 1 FHNG-A128WRMO Lower oven hinge

1

AF

2- 2 GCABUA310WRPO Outer case cabinet

1 BF

2- 3 MHNG-A227WRMO Upper oven hinge

1

AE

2- 4

PCOVPA211WRPO Turntable motor cover

1 AE

2- 5 PCAPHA015WREO Cabinet cap white

2 AD

2- 6

GLEGPA023WREO Foot

4 AC

CONTROL PANEL PARTS

;I :A

CPWBFA366WRKO Control unit (New Zealand only)

QCNCMAO78DREO 4-pin connector (A) 3- 1B QCNCM0027WREO 2-pin connector (B) 3- 1c QCNCWAO3ODREO 12-pin connector (D) 3- 1D RV-KXA037DREO Fluorescent display tube

Cl

RC-KZA032DREO Capacitor

O.lpF 50V

c2

VCEAB31VW108M Capacitor

1000pF 35V

c5 VCEAB31EW476M Capacitor

47pF 25V

C6,7,20,VCKYBllEX103N Capacitor

O.OlpF 25V

C21,40

-. c50-53 C80

VCKYDllHB331K Capacitor VCEAB31HW104M Capacitor

330pF 50V

C81

O.lpF 50V

C82

VCEAB31HW225M Capacitor

2.2pF 50V

c90

VCEAB31HW335M Capacitor

3.3pF 50V

VCC-F31H-680J Capacitor

68pF 5ov

c91 CF90

VCC-F31H-181J Capacitor

180pF 5ov

Dl-5

RCRS-2008DREO Ceramic filter KBRGPOB (6OOkHz) VHDllESl///-1Diode (11ESl)

D51-57,

VHDlSS27OA/-1Diode (lSS270A)

D80-83

ICl

RH-IZA312DREO LSI

Ql

Q20,82

VS2SB910MR/-4 Transistor (2SB910MR) VSDTC114ES/-3 Transistor (DTC114ES)

8;:

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

R2

VRD-B12HF272JResistor

R3

VRD-B12HF102J Resistor

2.7Kn 1/2W

R4

VRD-B12HF112J Resistor

lKf2 1/2W

l.lKn 1/2W

1

BP

1 AD

AB i AE 1

AU 1

AB 1 AG

AB

5' AA

4 AA

1

AC

1 AA

1 AA 1 AA

AB i AF 5 AB

11 AA

AS :: AC

2

AB 1 AB 1 AC

AB :: AA 1

AA

39

I?-4A52 R-4E52

““LFi

I IITj vv,,ayc J”ppllc” L” LIIC pcx,,a CIIC- ylcxaLrl 111(111 L.J”Y.

REF. NO. PART NO. DESCRIPTION

R5 VRD-B12EF821J Resistor

82OSl 1/4W R10 VRD-B12EF123J Resistor 12kn 1,'4W R11,20, VRD-B12EF103J Resistor lOkf2 1/4W

R64

R30,60

VRD-B12EFlOZJ Resistor

lkn 1/4W

R31

VRD-B12EF332J Resistor 3.3k0 1/4W

R40

VRD-B12EF473JResistor 47kn 1/4W

R41

VRD-B12EF563J Resistor 56kfi 1/4W

R50-53 VRD-Bi2EF183J Resistor

18kn 1/4W

R151-157

Q’TY

CODI

1 AA 1

AA

3

AA

2 AA 1 AA

AA

i AA

11 AA

R80 VRD-B12EF623J Resistor 62Kn 1/4W R81 VRD-B12EF471J Resistor 47on 1/4w R82 VRD-B12EF201J Resistor 2000 1/4w R83 VRD-B12EF390J Resistor 390 1/4w R90

VRD-B12EF122J Resistor 1.2Kn 1/4W

RYl RRLY-A02ODREO Relay (OJ-SH-112LM) RY2 RRLY-A059DREO Relay (VS14MB-NR) SP30 RALM-AOlODREO Buzzer (PKM22EPT-CA)

Tl RTRNPA064DREO Transformer VRSl RH-VZAOlODREO Varistor (TNR15G471K)

ZDl VHEHZ12Bl//-1 Zener diode (HZ12B-1) ZD2 VHEHZGC2///-1 Zener diode (HZ6C-2) ZD3 VHEHZGA3///-1 Zener diode (HZ6A-3) ZD10,20 VHEHZllA3//-1Zener diode (HZllA-3) 3- 2 - HPNLCA903WRFO Control panel frame (R4A52)

HPNLCA891WRFO Control panel frame (R4E52)

3- 3

- DUNTKA430WRKO Key unit assembly (R4A52)cDUNTKA423WRKO Key unit assembly (R4E52)

3- 4 GMADIA055WRFO Display window 3- 5 JBTN-A596WRFO Open button (R4A52)

JBTN-A659WRFO Open button (R4E52)

3- 6 MSPRTA050WREO Open button spring

3- 7

XEPSD30PlOXSO Screw; Control unit mtg.

1AA 1

AA 1 AA 1

AA 1AA

AH i AK 1 AA

AS

i AE 1 AB

1AA

AC

; AA 1 AS

1

AS

1 BC

BC t AE 1 AF

1

AF 1 AA 3 AA

OVEN P’ARTS

4- 1 LBNDKA038WRPO Capacitor holder

1 AH

4- 2

LSTPPA069WRFO Cord anchorage (upper) 1

AE

4- 3

LSTPPA070WRFO Cord anchorage (lower)

1

AD

;I ";

FDAI-A138WRYO Bottom plate right

1

PDUC-A406WRFO Air duct

1 AK

;I g

PHOK-A065WRFO Latch hook

AL

PCUSUA236WRPO Partition cushion

i AF

4- .7 PCUSUA237WRPO Waterproof cushion

1 AF

tr1:

FOVN-A21OWRTO Oven cavity

1 AK

GDAI-AlGlWRWO Bottom plate left

1 AH

4-11

MLEVPA166WRFO Latch lever

1

4-12 FROLPA047WRKO Roller stay

1.g

4-13 NTNT-A036WREO Turntable

1 AX.'

4-14 GFTA-A008WRWO Oven lamp access cover

1 AF

4-15 NCPL-AOlSWRFO Turntable coupling

1 AD

4-17 PCOVPA212WREO Waveguide cover

AF

4-18

PCUSUA157WRPO Cushion

:: AC

4-19

PCUSUA235WRPO Exhaust cushion

1 AF

4-20 PPACGA096WREO O-ring

1

4-21

PFILWA041WREO Oven lamp filter

1 AA

4-22

LBOS-A045WREO Waveguide stub

1

4-23

PGIDHA044WRPO Magnetron air guide

1

4-24

LANGQA167WRMO Earth angle' (For New Zealand Model)

AB

4-25

LANGQA288WRPO Noise filter angle (For New Zealand Model)

; AC

4-26

PCUSU0158YBPO Cushion

1

AA

4-27

PCUSGA305WRPO Oven cushion (R-4A52)

AD

4-28

PCUSUA278WRPO MG cushion

40

R -4A52 R-4E52

Note :

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

,

REF. NO. 1 PART NO.

I

DESCRIPTION

10’~~ ICODE

DOOR PARTS

CDORFA464WRKO Door assembly, complete. (R-4E52) CDORFA467WRKO

Door assembly, complete. (R-4A52)

FDORFA210WRTO

Door panel (R-4A52)

FDORFA204WRTO

Door panel (R-4E52)

GCOVHA233WRFO

Choke cover

BH BP BF

5

5- 1

5- 2 5- 3

LSTPPA093WRFO

Latch head

5- 4

MSPRTA114WREO

Spring

5- 5

HPNL-A334WREO Door screen (R-4A52)

5- 5

HPNL-A323WREO Door screen (R-4E52)

5- 6

PSHEPA336WRPO

Sealer film

5- 7

GWAKPA165WRFO

Door frame (R-4A52)

AK AF

AD AT AT AF

MISCELLANEOUS

6-

1

6-

2

;I '3 6-

3

TCADCA327WRRO Cook book TINS-A214WRRO Instruction book (R-4E52) TINS-A219WRRO Instruction book (R-4A52) TSPCNB349WRRO Rating label (R-4E52) TSPCNB362WRRO Rating label (R-4A52) (For New Zealand Model)

TSPCNB361WRRO Rating label (R-4A52) (For Australian Model) QTANP0020YBEO Connector CE-230 QW-QZA141WREO High voltage wire A TCAUHAO55WRRO Caution label TLABSA029WRRO M8A label (For Australian Model)

FW-VZA918WREO Main wire harness (For Australian Model) FW-VZA929WREO Main wire harness (For New Zealand Model) FW-VZA919WREO Low voltage harness TCAUH0123WRRO Microwave cushion (For Australian Model) TGAN-A002WRRO Guarantee card (For New Zealand Model)

1 1 1 1 1

AV AF AF AB

AD AA AH AF AC

AX

AH AE AB

AB AB AB AA AB

AA AA AA AB AA

AA

3

AA

6

AA

3

AA

AA AA

;I ;

6- 5 6-

6

6-

7

6- 8 ;I cj

6-10 6-11

SCREWS AND WASHERS

Screw;

fuse holder mtg.

(For Australian Model )

Screw;

M4 x 12 (For Australian Model) Screw; M4 x 12 (For New Zealand Model) Screw;

M4 x 12 Special screw; LHSTIX LR-4 (For Australian Model)

XFPSD30PlOOOC

XOTSD40P12RVC XOTSD40P12RVC XOTSD40P1200C LX-CZA029WREC

XFPSD40P3000C LX-CZ0052WREC XCPSD50P12KSC XOTSE40P0800C XFPSD30P0600C

XFPSD40P08KOC

-.

XFPSD4UP08KOC

7-12

XFPSD40P0800C

XHTSD40P08RVO

7-12

XHTSD40P08RVO

7-13 7-14

7-15 7-16 7-17 7-18

7-19 7-20

LX-WZA004WREO XBTSD40P08RVO

XBTUW40P08000 xwsuw40-10000 XWVSD40-05000 XWVSD50-0600C

XFTSD40PlOOOC

LX-BZ0060YBTC

Screw; Special screw;

Screw; Screw; M4 x 8 Screw:

Screw;

M4 x 8 zinc plated steel

(For Australian Model)

Screw;

M4 x 8 zinc plated steel

,

(For New Zealand Model)

Screw;

M4 x 8 zinc plated steel

Screw;

M4 x 8 zinc plated steel--

(For Australian Model)

Screw;

M4 x 8 zinc plated steel

(For New Zealand Model)

Washer; Screw;

M4 x 8

Screw;

M4 x 8 Washer; Washer;

Washer;

Screw;

M4 x 10

,

Special screw:

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

41

R -4A52 R-4E52

1 2

3 4

I 5 6

OVEN PARTS

\

‘.

\

I

----- -------

3

6

l-12

1

2

3

4

5 6

42

7

A

B

C

D

E

F

G

H

-

CONTROL PANEL PARTS (R-4A52)

3.1

P

R -4A52 R-4E52

1

2 3

4 5

6 ,

1

I

d

\

/

3.3

\

/

\/

CONTROL PANEL PARTS (R-4E52)

3.1

P

1

2

3 4

5 6

43

R -4A52 R-4E52

1

2

3 4

5

6

DOOR PARTS

,___________-______-------------------------------------------------~------.

,’

,*

--._

,,,’

--.,

,/

_’

,/-

,,**

_*

,/

,_**

_,--

,<-’

_,--

,_,-

,’

,/’

,,*’

,<I’

,/

,/-

,/’

__*’

_/’

.’

,/

_/

,/

,*

MISCELLANEOUS

<

240mm

>

1 2

3

4

5

6

4

44

R -4A52 R-4E52

1

I

2

3 4

5

6 .

PACKING AND ACCESSORIES

A

PACKING ADD KIT FOR R-4E52 7:: (CPADBA 108WRKO)

TRAY HOLDER

__-_. -_-

tft(SPADFA208WREO)

-

B

C

D

E

%(SPADFAOGlWREO)

F

I

Tray pad

G

:

FOR

R-4A52 AUSTRALIA

%(SPAKCB567WREO)

: FOR R-4A52 NEW ZEALAND

ic(SPAKCB548WREO)

: FOR R-4E52

H

1 2

3

I

4

5

6

45

R-4A52 R-4E52

SHARP

‘90 0 SHARP CORP. (lOK0.93E) Printed in Japan

Sharp R-4A52, R -4, E52, R-4E52 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual