Sharp R-4H55, R-4X55, R-4X55B Service Manual

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Page 1

WH5.5 R-4X55 ls4x55a

SHARP SERVICE MANUAL

S9312R4X55PJZ

MICROWAVE OVEN

R-4H55

MODELS Rm4H55

R-4X55 Rm4X55B

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

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

TABLE OF CONTENTS

GENERAL IMPORTANT INFORMATION

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

WARNING

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

RODUCT SPECIFICATIONS

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

APPEARANCE VIEW

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

OPERATING SEQUENCE

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

FUNCTION OF

IMPORTANT COMPONENTS’

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

TRABLESHOOTING CHART ......................................................................................................................... 7

TEST PROCEDURE ....................................................................................................................................

TOUCH CONTROL PANEL

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

.20

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

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

.27

MICROWAVE MEASUREMENT

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

.30

WIRING DIAGRAM

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

PICTORIAL DIAGRAM

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

.36

CONTROL PANEL CIRCUIT

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

.38

PRINTED WIRING BOAD

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

PARTS LIST ............

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

SHARP CORPORATION

Page 2

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R-4X55B

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Page 3

SERVICE MANUAL

SHARP

MICROWAVE OVEN

R-4H55 /R-4X55/ Fb4X55B

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 that 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 andgaskets must be secured. Never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide.

WARNING

Never operate the oven until the following points are ensured.

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

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

All the parts marked “*”

on parts list are used at voltages more

than 250V.

Removal of the outer wrap gives access to potentials above 250V.

SHARP CORPORATlON

OSAKA, JAPAN

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PARTS LIST

Page 4

._ .

R-4X55 A-4X55B

PRODUCT SPECIFICATIONS

ITEM

Power Requirements

Power Consumption Power Output

Case Dimensions

Cooking Cavity Dimensions

Turntable diameter Control Complement

Set Weight

DESCRIPTION

240 Volts (Australia) / 230 - 240 Volts (New Zealand) 50 Hertz Single phase, 3 wire earthed

1.4 kW 750 watts nominal of RF microwave energy (AS 2895 1986) 850 watts nominal of RF microwave energy (IEC-705-1988 ) Operating frequency of 2450MHz Width 550mm

Height 312mm Depth 420mm

Width 381 mm

Height 21 Omm Depth 411 mm 360mm Touch Control System Clock ( 1:OO - 12:59) Timer (0 - 99 minutes 99 secinds) 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

DEFROST SENSOR (R-4X55/4X55B) WEIGHT ADJUST (R-4X55/4X55B) EASY DEFROST (R-4H55) SENSOR INSTANT ACTION SENSOR COOK, REHEAT SENSOR NUMBER pads POWER LEVEL pad, MORE, LESS pads STOP/CLEAR pad

AUTO START/CLOCK pad

INSTANT COOK/START pad

Approx. 17 kg

GENERAL INFORMATlOil

WARNING

THIS APPLIANCE BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW

: EARTH

BLUE

: NEUTRAL

BROWN

: LIVE

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R-4H55

R-4X55 WX55B

APPEARANCE VIEW

10.

11.

Ventilation openings Oven lamp

Door hinges

Safety door latches

See through door

Coupling

Door open button Touch control panel Digital readout Wave guide cover Access cover for oven

lamp replacement

12. Power supply cord

13.Menu Label for Sensor Cook

14. Rating label

15. Defrost rack(R-4X55/B)

TOUCH CONTROL PANEL

m SMART

I & EASY

R-4H55

a. SENSOR COOK PAD

Press to select several popular menus.

b. REHEAT SENSOR PAD

Press to select 3 popular Reheat menus.

c. WEIGHT ADJUST PAD (R-4X55, R-4X55B)

Press to zero the weight of your own dishes before defrosting on DEFROST SENSOR.

d. DEFROST SENSOR PAD (R-4X55, R-4X55B)

Press to defrost meat or seafood automatically.

e. SENSOR INSTANT ACTION PADS

Press to once to cook 1 of 6 popular menus.

f. NUMBER PAD

Press to enter cooking times, clock time or to select

the Sensor Cook menus.

g. POWER LEVEL PAD

Press to select microwave power setting

If not pressed, HIGH is automatically selected.

2 3 4 5

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L-6 7 8 9 0

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h. EASY DEFROST PAD (R-4H55)

Press to defrost meat by entering weight.

MORE( A ), LESS( v ) PADS

Press to increase/decrease the time in one minute increments during cooking or to alter the doneness for the Sensor Instant Action, Reheat Sensor, Sensor Cook, Easy Defrost(R-4H55) or Defrost Sensor (R4X55/4X558) modes.

j. STOP/CLEAR PAD

Press to clear during programming. Press once to stop operation of oven during cooking: press twice to cancel cooking programme.

k. AUTO START/CLOCK PAD

Press to set clock or Auto Start time.

I. INSTANT COOK/START PAD

Press once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is pressed during cooking. Press to start oven after setting programmes.

Page 6

R-IX55 R-4X558

OPERATION 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 plugged in a wall outlet, rated voltage is supplied to the point (A3+A5) in the control unit.

Figure O-1 on page 34 or 35

1. The display flashes “88:88”.

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

3. .I’ :

” appears 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 pads and start the oven with touching START pad.

Function sequence

Figure O-2 on page 34 or 35

CONNECTED COMPONENTS

RELAY

Oven lamp, Fan motor, Turntable motor

RYl

Power transformer

RY2

Rated voltage. is supplied to the primary winding of the

power transformer. The voltage is converted to about

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

SWITCH

DURING

DOOR OPEN

CONTACT

COOKING (NO COOKING)

Upper latch switch

COM-NO

Closed Open

Lower latch switch

COM-NO

Closed Open

Monitor switch

COM-NC

Open Closed

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, lower 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 (RYl) stays closed. Shown in the display is the remaining time.

6. MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by oven

door, and monitors the operation of the upper and lower latch switches.

6-l

6-2.

6-3.

When the oven door is opened during or after the cycle of a cooking program, the upper latch switch, lower latch switch and stop switch must open their contacts first. After that the contacts (COM-NC) of the monitor switch can be closed. When the oven door is closed, the contacts (COM-

NC) of the monitor switch must be opened. After that

the contacts of the upper latch switch, lower latch

switch and stop switch are closed. When the oven door is opened and the contacts of theupper latch switch, lower latch switch remain

closed. The fuse M8A will blow, because the monitor

switch is closed and a short circuit is caused.

VARIABLE COOKING

When the microwave oven is preset for variable cooking power. Rated voltage is supplied to the power transformer intermittently within a 32-second time base through the relay contact which is coupled with the relay(RY2). The following levels of microwave power are given.

SETTING;

HIGH

32 sec. ON

MEDIUM HIGH 24 sec. ON

8 sec. OFF

Approx. 70%

MEDIUM

MEDIUM LOW

LOW

18 sec. ON 14 sec. OFF

Approx. 50%

12 sec. ON

20 sec. OFF

Approx. 30%

6 sec. ON 26 sec. OFF

Approx. 10%

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

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

Page 7

SENSOR COOKING CONDITION

Using the SENSOR COOK, REHEAT SENSOR or SENSOR INSTANT ACTION function, the foods are cooked or defrosted without figuring time, power level or quantity. When the oven senses enough steam from the food, it re-

lays the information to its microprocessor which will calcu-

late the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works:

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

2. Heat potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.

Cooking Sequence.

1. Touch each SENSOR COOK function pad to operating the sensor cooking.

NOTE:The oven should not be onerated on SENSOR

COOK, REHEAT SENSOR or SENSOR INSTANT ACTION immediately after plugging in the unit. Wait five minutes before cooking on SENSOR COOK, REHEAT SENSOR or SENSOR INSTANT

ACTION.

Select desired Sensor setting. Touch START pad (REHEAT SENSOR and SENSOR

INSTANT ACTION fuction are not neccessary to touch START pad.) The coil of shut-off relay (RY-1) is energized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.

NOTE:During this first stage, do not open the door or touch

STOP/CLEAR pad When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir food, turn it or season, etc. When the timer reaches zero, an audible signal sounds. The shut-off relay and cook relay are de-energized and the power transformer, oven lamp, etc. are turned off. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

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

Page 8

R4H55 R-4X55 R-4X55B

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

The door can be opened by pushing the door open button an 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

UPPER LATCH SWITCH

LATCH HEAD

DOOR OPEN ’ BUTTON

Figure D-l. Door Open Mechanism

UPPER LATCH SWITCH, LOWER LATCH SWITCH AND STOP SWITCH

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.

MONITOR SWITCH

1. When the oven door is closed, the contacts (COM- NC) must be opened.

2. When the oven door is opened, the contacts (COMNC) must be closed.

3. If the oven door is opened and the contacts (COM- NO)

of the upper and lower latch switches fail to open, the fuse (M8A) blows simultaneously with closing the contacts (COM-NC) of the monitor switch.

CAUTION: BEFORE REPLACING A BLOWN FUSE

(M8A) TEST THE UPPER AND LOWER

LATCH SWITCHES, MONITOR SWITCH AND MONITOR RESISTOR FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”.)

MONITOR RESISTOR (0.8$2 20W)

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

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 (M8A) when the high voltage rectifier is shorted.

H;;jH VOLTAGE RECTIFIER

The rated peak reverse voltage of Di 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 asymmet-

ric 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 M8A.)

1. The high voltage rectifier is shorted by any causes when microwave cooking.

2. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.

3. D2 of the rectifier is shorted.

4. The large electric currents flow through the high voltage winding of the power transformer.

5. The large electric currents beyond 8A flow through the primary winding of the power transformer.

6. The fuse (M8A) blows by the large electric currents.

7. The power supply to the power transformer is cut off.

THERMAL CUT-OUT 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 remains 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 will be close its contacts again when its temperature goes down lower than -20°C.

FUSE (M8A)

1. If the wire harness or electrical components are shortcircuited, this fuse blows to prevent an electric 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 remains closed with the oven door open and when the monitor switch closes.

TEMPERATURE FUSE 15O’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.

Page 9

RdX55 RdX55B

TURNTABLE MOTOR

The turntable motor drives the turntable roller assembly to

neled through the oven cavity to remove steam and vapors

given off from the heating foods. It is then exhausted

rotate the turntable.

through the exhausting air vents at the oven cavity.

FAN MOTOR

The fan motor drives a blade which draws external cool air.

NOISE FILTER (For New Zealand Model R-4X55)

The noise filter prevents the radio frequency interference

This cool air is directed through the air vanes surrounding

that might flow back in the power circuit.

the magnetron and cools the magnetron. This air is chan-

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*

1) Disconnect the supply.

2) Door opened, and wedged open.

3) Discharge high voltage capacitor.

1) Reconnect all leads removed from components during testing.

2) Replace the outer case (cabinet).

3) Reconnect the supply.

WARNING AGAINST THE CHARGE OF THE 4) Run the oven. Check all functions.

HIGH-VOLTAGE CAPACITOR

The high-voltage capacitor remains charged about

Microwave ovens should not be run empty. To test for

60 seconds after the oven has been switched off.

the presence of microwave energy within a cavity,

Wait for 60 seconds and then short-circuit the con-

place a cup of cold water on the oven turntable, close

nection of the high-voltage capacitor (that is, of the

the door and set the microwave timer for two (2) min-

connecting lead of the high-voltage rectifier) against

utes. Set the power level to HIGH and push the START

the chassis with the use of an insulated screwdriver.

button. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the

Sharp recommend that wherever possible fault-finding

water remains cold carry out 3D checks and re-exam-

is carried out with the supply disconnected. It may in,

ine the connections to the component being tested.

some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the pri-

mary 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 of the power transformer.

When all service work is completed, and the oven is fully assembled, the microwave power output should be

checked and microwave reakage test carried out

TROUBLESHOOTING GUIDE

When troubleshooting the microwave oven, it is helpful

IMPORTANT: If the oven becomes inoperative because of a

to follow the Sequence of Operation in performing the

blown fuse M8A in the upper latch switch -

checks. Many of the possible causes of trouble will re-

lower latch switch - monitor switch - monitor

quire that a specific test be per-formed. These tests are

resistor circuit, check the upper latch switch,

given a procedure letter which will be found in the “Test

lower latch switch, monitor switch and moni-

Proceduresection.

tor resistor before replacing the fuse M8A.

Page 10

TEST PROCEDURE

ABCDEEEEFGHHII

J K L t 0

POSSIBLE CASE

AND DEFECTIVE

:ONDITION

PROBLEM

Home fuse blows when power supply

cord is plugged into wall outlet.

FUSE M8A blows when power supply .cord is plugged into wall outlet.

“88:88” does not appear in display but power supply cord is plugged into wall outlet.

0 00 00 0

Display does not operate properly

&orrro~ when STOP/CLEAR pad is touched.

Oven lamp does not light at door opened. (Display appears.)

Oven does not start when the START pad is touched. (Display appears)

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

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

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

Oven seems to be operating but little

or no heat is produced in oven load. 0 0 0 0 Ly:;rwave power level is set at

OOKMG Oven does not seems to be operating

roperly when MEDIUM HIGH ME-

oNDrTtoN EIUM, MEDIUM LOW or LOW i’s set.

(Oven operates roper1 at HIGH and then the ST 8 I! P/CL AR

touched the oven stops.)

pad is

Oven goes into cook cycle but shuts

down before end of cooking cycle.

000

Oven stops as soon as when the 0 0 0 0 START pad is touched.

#ENSOR

AH sensor does not end 1st stage or

iEiyr&

cooking during Sensor Cooking condition (Oven does not shut off when a

cup of water is boiling by Sensor

Cooking.) or oven stops soon.

‘EIGHT ENSOR

The display shows “ERROR” and

oND,T,ON oven stops during Defrost Sensor

Cooking condition

Page 11

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R-4X55 R-4X55B

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Page 12

RdH55

RdX55 RdX55B

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

MAGNETRON TEST

NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.

CARRY OUT 3D CHECKS

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

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

filament terminals, the meter should show a reading of less than 1 ohm. To test for a short circuit filament to anode condition, connect ohmmeter between one of the filament

terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance.

If a low or zero resistance reading is obtained then the magnetron should be replaced.

MICROWAVE OUTPUT POWER (1 Litre water load)

The following test procedure should be carried out with the microwaveoven in a fully assembled condition (outer case fitted).Microwave output power from the magnetron can be measured by way of IEC 705, i.e. it can be measured by using water load how much it can be absorbed by the water load. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used.When P(W) heating works for t(second), approximately P x t/4.1 87calorie 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 thewater is V x AT

The formula is as follows; Pxtl4.187=VxAT P(W)=4.187xVxAT/t Our condition for the water load is as follows: Room temperature

. . . . . . . . . . . . . . . . . . . . . . . . . . around

20°C

Power supply Voltage . . . . . . . . . . . . . . . Rated voltage

Water load . . . . . 1000 g

Initial temperature

. . . . . . . . . . . 10+2”C Heating time . . . . . . . . . . . . . . . . . . . . . 47

sec.

P=90xAT

Measuring condition:

1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start of the test.

3. Temperature of the water

The initial temperature of the water is (10 f. 2)X.

4. Select the initial and final water temperature so that the maximum difference between the final

water temperature and the ambient temperature is 5°C.

Select stirring devices and measuring instruments in order to minimize addition or removal of heat.

6. The graduation of the thermometer must be scaled by 0.1 “C at minimum and an accurate thermometer.

7. The water load must be (1000 + 5) g.

“t” is measured while the microwave generator is operating at full power. Magnetron filament heatup time is not included.

NOTE: The operation time of the microwave oven is “t + 2" sec. 2 sec. is magnetron filament heat-up

time.

Measuring method:

1. Measure the initial temperature of the water before the water is added to the vessel.

(Example: The initial temperature Tl = 11 “C)

2. Add the 1 litre water to the vessel.

Place the load on the centre of the shelf.

Page 13

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

4. Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of (10 -t 2)“C.

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

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

7. Calculate the microwave power output P in watts from above formula.

Initial temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tl

= 11 ‘C

Temperature after

(47+2)= 49

sec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T2

= 21 “C

Temperature difference

Cold-Warm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AT1 = 10°C

Measured output power The equation

is ‘!P= 90 x AT"

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 90 x 10°C = 900 Watts

JUDGMENT: The measured output power should be at least + 15 % of the rated output

power.

CAUTION: 1 C CORRESPONDS TO 90 WATTS. REPEAT MEASUREMENT IF THE POWER IS

INSUFFICIENT.

l5d

Heat up for 49 sec.

MICROWAVE OUTPUT POWER (2 Litre water load)

The following test procedure should be carried out with the microwave oven in a fully assembled condition (with outer case fitted). Microwave output power from the magnetron can be measured by way of substitution, i.e. it can be measured by using a water load how much it can be absorbed by the water load. To measure the

microwave output power in the microwave oven, the relation of calorie and watt is used. On the other hand, if the temperature of the water with V(ml) rises AT (“C) during this microwave heating period, the calorie of the water is V x AT.

The formulae is as follows;

P =8330xAT/t

Our condition for the water load is as follows:

Room temperature . . . . . . . . . . . . . . ...23+ 2°C

Power supply Voltage

. . . . . . . . . . . . . . . . . . Rated

voltage.

Water load . . . . ...2000 ml

Initial temperature

. . . . . . . 23 & 1 “C

Heating time .,.. 1 min. 51 sec.

P=75xAT

Measuring method:

A) The two water containers must be prepared.

The water container must be one (1) litre beaker made of Pyrex glass and its diameter approximately 12cm.

B) Put the one (1) litre water into each beaker (Each beaker has one litre water). The initial tempera-

ture of the water should be 23-C.

C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the

temperature of water the thermometer and note them. The graduation of the thermometer must be

scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended. D) Place the two (2) beakers as touching each other in the centre of the oven cavity. E) Set the timer to 1 minute and 51 seconds and then start the oven at HIGH.

Page 14

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring

the water with thermometer and note them.

Example

Initial temperature . .

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

Tl = 23°C T2 = 24°C

Temperature after 1 min. 51 sec.

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

Tl = 33°C T2 = 34°C

Temperature difference Cold-Warm

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

AT1 = 10°C AT2 = 10°C

Mean temperature

rise AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AT = (AT1 rt AT2) / 2 = (1 O”C+lO”C) / 2 = 10°C

Measured output power

The equation is P= 75 x AT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 75 x

10°C = 750 Watts

NOTE: The measured output power should be at least f 15 % of the rated output power.

CAUTION: 1°C CORRESPONDS TO 75 WATTS.

REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

(Tl ‘C)

(T2’C) (Tl ‘C)

Heat up for 1 min. 51 set

Pii

2 -

- -

(T2’C)

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 at the highvoltage circuits, including the magnetron filament.

CARRY OUT 3D 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

. . . . . . . . . . . . . . . . . . . . . . . . . approximately

1 .42 ohms.

b. Secondary winding

. . . . . . . . . . . . . . . . . . . . . approximately

78.9ohms.

c. Filament winding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

less than 1 ohm.

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

should be replaced.

CARRY OUT $FJ CHECKS

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.

Page 15

R-4H55 R-4X55 R-4X55B

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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 infinite in one direction and mor than 100 kR in the other direction.

CARRY OUT* CHECKS

ASYMMETRIC RECTIFIER TEST

ASYMMETRIC

CARRY OUT 3D CHECKS.

RECTIFIER

Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be tested using an ohmmeter se? 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 trans-

former is shorted.

CARRY OUT 4R CHECKS

NOTE: For measurement of the resistance of the rectifier, the batteries of the measuring instrument

must have a voltage at least 6 volts, because otherwise an infinite resistance might be shown in both directions.

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 resis-

tance range.

C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10 MR

after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance of about 10 MR because of its internal 10 MQ

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 nor-

mal.

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

CARRY OUT $FJ CHECKS

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

COM to NO COM to NC

Released

O.C. S.C.

Depressed

S.C.

O.C.

COM; Common terminal NO; Normally open terminal

NC; Normally closed terminal S.C.; Short circuit O.C.; Open circuit

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

CARRY OUT 4R CHECKS.

Page 16

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

NOISE FILTER TEST (New Zealand Model)

CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, Check between the terminals as described in the following table.

L (min) 1 CxtiO% 1 CyX?O% l.OmH 1 O.lpF 1 22OOpF

MESURING POINT

INDICATION OF OHMMETER

Between N and L

Open circuit

Between terminal N and WHITE

Short circuit

Between terminal Land RED

Short circuit

If incorrect readings are obtained, replace the noise filter unit.

CARRY OUT 4R CHECKS.

G MONITOR RESISTOR TEST

CARRY OUT =CHECKS. Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check

between the terminals of the monitor resistor.

The resistance of monitor resistor is aoorox. 0.8 ohms.

If incorrect readings are obtained, replace the monitor resistor.

CARRY OUT 4R CHECKS.

H TEMPERATURE FUSE OR THERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS

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

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

CARRY OUTa CHECKS

Table: Thermal cut-out Test

Parts Name

Thermal cut-out 145’C Temperature fuse 15o’C

Temperature of “ON” condition

Temperature of “OFF” condition

Indication of ohmmeter

(closed circuit)

(open circuit)

(When room temperature

is approx. 20-C)

-20-c

Above 145-C

Closed circuit.

This is not resetable type

Above 150X

Closed circuit.

If incorrect readings are obtained, replace the temperature fuse or thermal cut-out.

An open circuit temperature fuse 150% (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 145°C (OVEN) indicates that the foods in the oven may catch fire, this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.

Page 17

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

MOTOR WINDING TEST

CARRY OUT aCHECKS

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

Motors Resistance Fan motor Approximately 246 R Turntable motor Approximately 12.5 kR

If incorrect readings are obtained, replace the motor.

CARRY OUT $FJ CHECKS

LIVE TEST FOR MOTOR WINDINGS

CAUTION: THE FOLLOWING PROCEDURE REQUIRES THE OVEN TO BE CONNECTED TO THE

SUPPLY AND SHOULD ONLY BE USED IF THE RELEVANT “COLD” CHECKS FOR THE MOTOR UNDER TEST ARE INCONCLUSIVE.

1. CARRY OUT 3D CHECKS

2. 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.)

3. Connect a voltmeter, set to 25OV AC, across the motor terminals. (Refer to the relevant motor test procedure or pictorial diagram for the correct terminal numbers.)

4. 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.)

5. Close the oven door.

6. Set the power level to HIGH and set the relevant timer for about three (3) minutes.

7. Note the reading on the meter and carefully observe the motor under test to see if it is turning.

8. CARRY OUT 3D CHECKS

9. 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 to the motor should be checked for continuity.

BLOWN FUSE M8A

CARRY OUT 3D CHECKS

1. If the fuse M8A is blown, there could be shorts or ground in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

2. If the fuse M8A is blown when the door is opened, check the 1st. latch switch, 2nd. latch switch, monitor switch.and monitor resistor.

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

If the fuse M8A is blown, there could be a short in the asymmetric rectifier or

there could be a ground in wire harness. A short in the asymmetric rectifier may have 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.

CARRY OUT 4R CHECKS

CAUTION: Only replace fuse M8A with the correct value replacement

Page 18

R-4X55 R-4X55E

TEST PROCEDURES

PROCEDURE

LElTER

COMPONENT TEST

K 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 isdivided into troubleshooting by unit replacement is described according to the symptoms indicated.

1. Key Unit.

Note : Check key unit ribbon connection before replacement. 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. Before replacing the control unit, perform the key unit test to determine if control units faulty. 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.

KEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed. first verify the ribbon is making good contact, verify that the door sensing switch(stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch(stop switch) is good, disconnect the flat ribbon that connects the key unit to the control unit and make sure the door sensing switch is closed(either close the door or short the stop switch connecter). Use the key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with abeep, the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used ( after clearing the control unit) to determine if the control unit or key pad is at fault.

(R-4X55. R4X558)

RELAY TEST

Remove the outer case and check voltage between Pin Nos. 3 and 5 of the S-pin connector (A) on the control unit with an A-C. voltmeter.; The meter should indicate 240 volts, if not check oven circuit.

RYl and RY2 Relay Test

These relays are operated by D.C. voltage.

Page 19

R-4H55 R-4X.55 R-4XS5B

TEST PROCEDURES

PROCEDURE

LElTER

COMPONENT TEST

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking.

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

DC. voltage not indicated....Check diode which is connected to the relay coil. If diode is good,

control unit is defective.

RELAY SYMBOL

OPERATIONAL

VOLTAGE

CONNECTED COMPONENTS

RYl Approx. 25V.D.C.

Oven lamp/Turntable motor/Cooling fan motor

RY2

Approx. 24V.D.C.

Power transformer

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 OCCURANCE

CAUSE OR CORRECTION

1 The rated voltage is not applied to POWER

Check supply voltage and oven main unit.

terminal of CPU connector (CN-A)

2 The rated voltage is applied to primary side of

Power transformer or secondary circuit defective. Check

power transformer. and repair.

Only pattern at “a” is broken.

‘Insert jumper wire Jl and solder.

Pattern at “a” and “b” are broken.

‘Insert the coil RCILF2003YAZZ between “c” and ‘IS’.

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

inspection of the varistor for burning damage and examine the transformer with tester presence of layer short-circuit

(check primary coil resistance). If any ab-

normal condition is detected, replace the

defective parts.

AH SENSOR TEST

Checking the initial sensor cooking condition

(1) The oven should be plugged in at least five minutes before sensor cooking. (2) Room temperature should not exceed 95’F(35”C). (3) The unit should not be installed in any area where heat and steam are generated. The unit

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

Page 20

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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

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

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

moisture with a dry cloth or paper towel.

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

be at refrigerator temperature and canned soup at room temperature.

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

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

(8) After about 41 minutes if the sensor has not detected the vapor of the food, ERROR will appear

and the oven will shut off.

Water load cooking test

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

tion. The cabinet should be installed and screws tightened.

(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) Touch SENSOR COOK pad and number pads 1 and 0. Now, the oven is in the sensor cooking

condition and SC-10 will appear in the display.

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

energy.

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

of sensor cooking.

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

water is boiling (bubling).

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

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

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

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

follows:

-_ 6-l. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup., 6-2. Place the container on the center of tray in the oven cavity. 6-3. Close the door. 6-4. Touch SENSOR COOK pad and number 1 pad and 0 pad. 6-5. Touch Start pad. The control panel is in automatic Sensor operation. 6-6. The oven will turn off automatically when the water is boiling (bubling). lf new sensor dose not operate properly, the problem is with the control unit.

CHECKING CONTROL UNIT

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

follows:

Page 21

R-4H5.5 R-4X55 R-4X.558

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

6-l. Touch SENSOR COOK pad and number 1 pad and 0 pad. 6-2. The control panel is in the sensor cooking operation. 6-3. After approximately 20 seconds, push plunger of select switch.This condition is same as

ludgement by AH sensor.

6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will sound, and

the display will then revert to the time of day.

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

Rl,R2:22ohm*1%1/2W

To connector(F) on Control Unit.

R3:1OkohmL5%1/4W

F-l -

R4: lMohmL5% l/4

F-2 F-3 -

CONNECTOR

r/ Plunger

FigureA. Sensor Dummy Resistor Circuit

WEIGHT SENSOR ASSEMBLY AND IC3lMEMORY) TEST.(R-4X!%,R-4X55B)

After replacing the weight sensor, turntable,control unit,turntable motor,or IC3, carry out the following procedure in order to calibrate the weight sensor. If the weight sensor is not recalibrate, the food may be over or under cooked.

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

1. Test Method

1. Place the turntable on the roller stay correctly, and close the door.

2. Plug the oven into a power point. (“88:88” will appear on the display.)

3. Press the STOP/CLEAR pad. (Display shows ’ : ” with sound of buzzer.)

4. Press the AUTO START/CLOCK pad. (Display shows ’

5. Press the DEFROST SENSOR pad. (Display shows ”

0” with sound of buzzer.)

6. Press the POWER LEVEL pad. (Display shows ’

O”.)

7. Press the INSTANT COOK/START pad. (Display shows ” TEST” with sound of buzzer.)

8. Press the “4” of number pads. (Display shows ” lamps come on.)

4” with sound of buzzer, and tuntable and oven

9. After 56 seconds, make sure that the display shows “00055 - 00250” with sound of buzzer.

If display shows less than 00055 or more than 00250, weight sensor is defect.

10. Place the weight 1.3 Kg+1 % (water load 1.3 Kg+1 %) on the turntable.

11. Press the “6” of number pads. (Display shows ” oven lamps come on.)

6” with sound of buzzer, and turntable and

12. After 56 seconds, make sure that the display shows “00030 - 00200” with sound of buzzer.

If display shows less than 00030 or more than 00200, weight sensor is defect.

13. Disconnect the oven from power supply, and repeat above procedure items 1 to 7

14. Press the “7” of number pads, and make sure that the display shows “00030 -00200”.

If display shows less than 00030 or more than 00200, IC3 is defect.

15. Press the STOP/CLEAR pad. (Display shows ” : ” with sound of buzzer.)

16. Impose 1.3 kg load on the defrosting rack and place it in the oven cavity. Touch the “DEFROST

SENSOR” pad. After approx. 56 seconds, time display appears.

2. Acceptance Standard.

1. Under 1.3 kg load : 32 min 22 sec. k 242 sec.

Page 22

iwH55 R-4X5.5 R-4X558

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.

3) Synchronizing Signal 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 B2,B3,B5,

B6,B7,GO and Gl. When a key pad is touched, a signal

‘is completed through the key unit and passed back to the

LSI through HO - H3 to perform the function that was re-

quested.

Control U nit

Control; unit consists of LSI, power source circuit, syn-

chronizing signal circuit, ACL circuit, buzzer circuit, tem-

perature measurement circuit, reheat sensor circuit and indicator circuit.

1) LSI

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

2) Power Source Circuit

This circuit generates voltage necessary in the control unit.

Symbol Voltage Application VC

-5.2v

LSI(ICl), ACL circuit

-25V Fluorescent display tube : Grid and anode voltage

VFl

3Vac

Filament of fluorescent display tube

VF2

(VFl to VF2 voltage)

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 responds to signals from the LSI to emit

noticing sounds (key touch sound and completion

sound).

Reheat Sensor Circuit

This circuit detects moisture of a food which is cooking

to allowl its automatic cooking.

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.

7) Stop Switch

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

8) Relay Circuit

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

9) Indicator Circuit

Indicator element is a Fluorescent Display.

Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the

filament serves as cathode.

The Fluorescent Display has 6-digits, 13-segments

are used for displaying figures.

10) Weight Sensor Circuit

The circuit measures the weight of food by piezo-elec-

tric device.

Page 23

DESCRIPTION OF LSI

LSI(IZA506DR)

The I/O signals of the LSI(IZA506DR) are detailed in the following table.

Pin No.

Signal

110

Description

vss

Power source voltaae: -5.2V

VC voltage of power source circuit input.

VASS IN

Reference voltaae inout terminal.

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

VREF IN

Reference voltaae innut terminal.

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

Terminal to chanae functions accordina to the model.

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

5-7

Al-A3 IN

Heatina constant comnensation terminal.

Innut sianal which communicates the door ooenklose information to LSI.

Door closed; “H” level signal( Door opened; “L” level signal(-5V).

WEIGHT sensor innut. (R-4X55.R-4X55Bl

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

IN AH sensor innut.

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

13 14 15

Used for intial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D

coverter built into the LSI.

RESET IN

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Set to “L”

level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.

OUT Clock signal to IC-3 (R-4X55,R-4X55B) El IN/OUT Data signal output from IC-3 and input to IC-3 (R-4X%,R-4X55B) INTl IN Sianal to svnchronize LSI with commercial Dower source freaencv.

This is basic timing for all real time processing of LSI

j--J& : 17

16 E3 OUT

Maanetron hiah-voltaae circuit drivina sianal.

To turn on and off the cook relay(RY2). In HIGH operation, the signals holds “L” level during microwave cooking and “H” level

while not cooking. In other cooking

modes (M.HIGH, MED,M.LOW,LOW) the signal turns to “H” level and “L” level in repetition according to the power level.

17-21 ~

co-c4 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor)

Page 24

Pin No.

Signal

Description

Used for initial balancing of the bridge circuit (WEIGHT SENSOR).(R4X55,R4X556)

l/O

OUT

22-23

C5-C6

OUT

Oven lame drivina sianal. (Sauare Waveform : 50Hz)

To turn on and off the shut-off relay(RY1).

zonlsec

The square waveform voltage is delivered

to the relay (RYl) driving circuit and relay

-ll-u-u-l -ll-uu-T

(RY2 ) control circuit.

O”“ng caC,ng

IN Sianal comina from touch kev.

When any one of G-l 2 line keys on key matrix is touched, a corresponding signal from B2,83,85,86,87,GO and Gl will be input onto HO. When no key is touched, the signal is held at ‘I” level.

IN Sianal similar to HO.

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

Sianal similar to HO.

When any one of G-l 0 line keys on key matrix is touched, a corresponding signal will be input into H2.

28 H3

IN Sianal similar to HO.

When any one of G-9 line keys on key matrix is touched, a corresponding signal will

be input into H3.

29 H4

H5-H7

VPP

OUT

Diait selection sianal.

The relation between digit signal and digit are as follows; Digit signal

Digit

H4 ________________________________ 1 St.

S(so”Z)

H5 ________________________________ 2nd.

____------_-____

GND

H6 ________________________________ 3rd.

H7 ________________________________ 4th.

FO _____ ____________________________ 5th. BO,Bl ____________________________ 6th.

Normally, one pulse is output in every 6

period, and input to the grid of the Fluo-

rescent Display.

FO n 81,En

I----- GND

30-32

Diait selection sianal.

Signal similar to H4.

Anode (Seament) of Fluorescent DisDlav liaht-uD voltaae: -25V

Vp voltage of power source circuit input.

35-36

BO-Bl

OUT

Diait selection sianal.

Signal similar to H4.

Diait selection sianal.

Signal similar to H4.

Seament data sianals.

The relationship between signals and indicators are as follows: Signal

Segment Signal

Segment

62 _______________ LB

GO _______________ f

G6 _______________ UB

B7 _______________ e

G5 _-____-________ k

B(j _______________ d

W-W

G4 _______________ j

B5 _______________ c

G3 _______________ i

B4 _-_____________ b

G2 ______-________ h

‘rul’:: +

B3 _______________ a

Gl _______________ g

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-l line keys on kev matrix is touched.

Page 25

Pin No.

Signal

I/O

OUT

41 B6

OUT

87 OUT

GO OUT

44 Gl OUT

45-49 G2-G6 OUT

50 G7 OUT

51 52 53

vcc

TEST 0 OUT

-____ OUT

0 IN IN

Description

Seament data sianal.

Signal similar to 82.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while

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

Seament data sianal.

Signal similar to 82.

Seament data sianal.

Signal similar to B2.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while

one of G-4 line keys on key matrix is tsuched.

Seam&t data sianal.

Signal similar to 82.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while

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

Seament data sianal.

Signal similar to B2.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-6 line keys on key matrix is touched.

Seament data sianal.

Signal similar to 82.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-7 line keys on key matrix is touched.

Seament data sianal.

Signal similar to 82.

Kev strobe sianal.

Signal applied to touch-key section. A pulse signal is input to HO - H3 terminal while one of G-8 line keys on key matrix is touched.

Seament data sianal.

Signal similar to B2.

Sianal to sound buzzer.

A . Key touch sound. B : Completion sound.

Connected to GND. Connected to VC (-5.2V).

-___

lnternel clock OSCillatiOn freaUenCV Control OUtDut.

Output to control oscillation input of 0 IN.

Internal clock oscillation freauencv settina inout.

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

with respect to 0 OUT terminal..

Page 26

R4H5.5 R-4X5.5 R-4X5.W

ABSOLUTE HUMIDITY SENSOR CIRCUIT

(1)Structure of Absolute Humidity Sensor

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

(2)Operational Principle of Absolute Humidity Sensor

The figure below shows the basic structure of an absolute humidity sensor. A bridge circuit is formed by two thermistors and two resistors (Rl and R2). The output of the bridge circuit is to be amplified by the operational amplifier. Each thermistor is supplied with a current to keep itself heated at about 150°C (302°F) and the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the inten-

sity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it will be amplified by the operational amplifier.

~~~~~, l/q;

Absolute humidity (g/m 2)

(3)Detector Circuit of Absolute Humidity Sensor

This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16

seconds later the detector circuit starts to function and the LSI observes the initial voltage available at its IN1 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R-l. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute

humidity sensor and IN0 terminal of the LSI. The voltage of IN1 terminal will indicate about -2.5V. This initial balancing is set up about 16 seconds after the unit

is put in the Sensor Cooking mode. As the sensor cooking proceeds, the food is heated to

generate moisture by which the resistance balance of

the bridge circuit is deviated to increase the voltage available at IN1 terminal of the LSI. Then the LSI observes that voltage at IN1 terminal and

compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit gets in the next necessary operation automatically. When the LSI starts to detect the initial voltage at IN1 terminal16 seconds after the unit has been put in the Sensor Cooking mode, if it is impossible to take a balance of the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will reappear on the display and the cooking is stopped.

Absolute humidity sensor circuit

rhermista tn “hcd “PCCd

C-

s&-z. iI ,~,AB

/ c~~~,~o 3

‘-a-J 1 -1 -1; 1

LSI

nt, “!

Page 27

-!!!-

R-4X55 R-lX55B

WEIGHTSENSOR CIRCUIT (R-4X55, R-4XX55B)

Turntable

Turntable Motor

Section View of Turntable

Weight Sensor

support

Construction of W eight Sensor

Weight

6B”SW

Weight sensor circuit

This circuit works to weight the food by weight sensor during SENSOR DEFROST modes to set heating time. Piezoelectric device is used in theweight detector section. When the roller below the turntable presses the knob, through oven seal. the piezO-electric device generates the voltage according the load applied on the roller. Weight sensor and then sent to A/D conversion input pin A5 inside of LSI. The LSI converts the value into weight and calculates the heating time. Weight measurement is made by the three rollers passing on the knob, taking the average value of the voltage then produced. This initial balancing is set up about 50 seconds afterunit is put in the Weight sensor cooking mode.

Page 28

SERVICING

1 .Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS 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 CMOS LSI.

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

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

2.Shapes of Electronic Components

Transistor

DTAll4YS

2SB793

DTAI 43ES

DTBl43ES DTDl43ES

2SA933S 2SC174OS

3.Servicing of Touch Control Panel

We describe the procedures to permit servicing of the touch control panel of the microwave oven and the

precautions you must take when doing so. To perform the servicing, power to the touch control panel is available either from the power line of the oven itself or from an external power source.

(1)Servicing the touch control panel with power supply of the oven:

CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD.

Therefore, when checking the performance of the

touch control panel, put the outer cabinet on the oven to avoid touching the high voltage transformer, or unplug the primary terminal (connector) of the high voltage transformer to turn it off; the end of such connector must be insulated with an insulating tape. After servicing, be sure to replace the leads to their original loca-

tions. A.On some models, the power supply cord between

the touch control panel and the oven itself is so short

that the two can’t be separated. For those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven.

B.On some models, the power supply cord between the

touch control panel and the oven proper is long enough that they may be separated from each other.

For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that

is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

(2)Servicing the touch control panel with power supply from an external power source:

Disconnect the touch control panel completely from the oven proper,and short both ends of the door sensing switch (on PWB) of the touch control panel,which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to

the power input terminal of the touch control panel, then

it is possible to check and repair the controls of the

touch control panel it is also possible to check the sen-

sor-related controls of the touch control panel by using

the dummy resistor(s).

4Servicing Tools

Tools required to service the touch control panel assem-

bly.

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

2) Oscilloscope: Single beam, frequency range: DC1OMHz type or more advanced model.

3) Others: Hand tools

5.0ther Precautions

1) Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity.

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

3) After aluminum foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied

to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to

PWB, making sure that all connections are tight.

5) Be sure to use specified components where high pre-

cision is required.

Page 29

R-4H55 R-4X55 R-4X55B

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC-

TIONS BELOW .BRBEFORE OPERATING THE OVEN.

1. CARRY OUT 3D CHECKS.

2. Make sure that a definite “click” can be heard when the 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.).

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 generating and transmission assembly.

7. There is visible damage to the oven.

Do not operate the oven:

Carry out any remedial work that is necessary before oper-

1. Without the RF gasket (Magnetron).

ating the oven.

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

Do not operate the oven if any of the following conditions exist

3. If the door is not closed.

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

1. Door does not close firmly. Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal proce-

dures:

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

6. Discharge the H.V. capacitor before carring out any

1. Disconnect oven from power supply.

further work.

2. Open the oven door and wedge it open.

7. Do not operate the oven with the outer case removed.

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

N.B.; Step 1,2 and 6 from the basis of the 3D checks.

of case.

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

from retaining clips on the cavity face plate.

5. Lift the entire case from the oven.

CAUTION: DISC

11.--- I..-.. .,-.-1-- -.-.I.

TOH Ott-u COMPONEI

JHAHtit HltiH VULI Atit C;Al-‘AC;I. ---A

IRE TOUCHING ANY OVEN ITS OR WIRING.

POWER TRANSFORMER REMOVAL

1. CARRY OUT 3D CHECKS

2. Remove the fan motor assembly from the oven refer-

ring to “FAN MOTOR ASSEMBLY”.

3. Disconnect the filament lead of the power transformer

from high voltage capacitor.

4. Disconnect the filament lead of the power transformer from the magnetron.

5. Disconnect the high voltage wire of H.V. rectifier assembly from the power transformer.

6. Remove the one (1) screw from under side and two (2) screws from upper side holding the transformer to bottom plate.

7. Remove the transformer.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)

To remove the components, proceed as follows.

1. CARRY OUT ;.us on;3D;.us off; CHECKS

2. Disconnect the high voltage wire A from the magnetron.

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

4. Disconnect the high voltage wire of the H.V. rectifier assembly from the high voltage capacitor.

holder from the high voltage capacitor.

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

8. Now high voltage rectifier assembly and capacitor

should be free.

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

CAUTION: WHEN REPLACING HIGH VOLTAGE

RECTIFIER ASSEMBLY, ENSURE THAT THE CATHODE (EARTH) CONNECTION IS SECURELY FIXED TO THE CAPACITOR HOLDER WITH AN EARTHING SCREW.

Page 30

R-4X55 R-4X55B

MAGNETRON

CARRY OUT 3D CHECKS Disconnect the H.V. wire A and filament lead(longer one) of the transformer from the magnetron. Release the main harness from the tabs of the air duct. Remove the air duct from the oven cavity. Carefully remove four (4) screws holding magnetron to waveguide, when removing the screws holding the magnetron to prevent it fro falling.

REMOVAL

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 magnetron.

CAUTION: WHEN REPLACING THE MAGNETRON,

BE SURE THE R.F. GASKET IS IN PLACE

SCREWS ARE TIGHTENED SECURELY.

OVEN LAMP AND LAMP SOCKET REMOVAL

CARRY OUT 3D CHECKS Remove the snap of the wire tie holding the wire leads to the oven lamp from the hole of the oven cavity.

Remove the one (1) screw holding the magnetron air

guide to the oven cavity.

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.

Figure C-l Oven lamp socket

TURNTABLE MOTOR REMOVAL

Disconnect the oven from power supply. Remove the turntable and roller stay from the oven

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

cavity.

to oven cavity bottom side and remove the turntable

Remove the one (1) screw holding the turntable motor

motor.

cover to the bottom plate and remove the cover.

6. Turntable motor is now free. At this time, o-ring and

Disconnect the wire leads from turntable motor.

washer is removed. Do not loose them.

TURNTABLE COUPLING REMOVAL

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

At the time turntable coupling will be free.

Figure C-2. Turntable Coupling

FAN MOTOR REPLACEMENT

REMOVAL

1. CARRY OUT 30 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.

4. Release the H.V. wire A and filament lead from the holes in the fan duct.

5. Remove the snap band of the wire leads connected to the oven lamp from the hole of the oven cavity.

6. Remove the one (1) screw holding the magnetron air guide to the oven cavity and remove the magnetron air guide.

7. Release the tabs of the fan duct from the holes in the

9. Now, the fan motor assembly is free. 1 O.Remove the fan blade from the fan motor shaft accord-

ing the following procedure.

1) Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers as shown in Figure C-3(a).

CAUTION:

Make sure that any pieces do not enter the gap be-

tween the rotor and the stator of the fan motor.

Because the rotor is easy to be shaven by pliers

and metal pieces may be produced.

Do not touch the pliers to the coil of the fan motor

because the coil may be cut or injured. Do not transform the bracket by touching with the pliers.

bottom plate and the back plate of the oven cavity. Release the main wire harness from the hole in the fan

2) Remove the fan blade assembly from the shaft of the

duct.

fan motor by pulling fan retainer clip and rotating the fan blade with your hand.

Page 31

Now, the fan blade will be free.

CAUTION: * Do not use this removed fan blade again.Because

the hole(for shaft) of it may become bigger than a standard one.

11 .Remove the two (2) screws and nuts holding the fan

motor to the fan duct.

12.Now, the fan motor is free.

INSTALLATION

1. Install the fan motor to the fan duct with the two (2) screws and nuts.

2. Install the fan blade to the fan motor shaft according the following procedure.

1) Hold the center of the bracket which supports the shaft of the fan motor on the flat table as shown in Figure C-

3(b).

2) Apply the screw lock tight into the hole(for shaft) of the fan blade.

Rear view

Side view

R-4X5.5 R4X55B

3) Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen ham-

mer or rubber mallet.

CAUTION:

l Do not hit the fan blade strongly when installed

because the bracket may be transformed.

* Make sure that the fan blade rotates smooth after

installed.

l Make sure that the axis of the shaft is not slanted.

3. Re-nstall the main wire leads into the hole in the fan duct.

4. Re-install the fan duct to the oven cavity.

5. Re-install the magnetron air guide to the oven cavity with one (1) screw.

6. Re-install the snap band of the.wire leads to the oven lamp to the hole of the oven cavity.

7. Re-install the H.V. wire A and filament lead into the holes in the fan duct and then re-connect them to the magnetron, referring to the pictorial diagram.

8. Re-connect the wire leads to the fan motor, referring to the pictorial diagram.

These are ese are the position the position

-where should be pinched with pliers

&Shaft

Figure C-3(a). Fan motor Removal

Figure C-3(b). Fan motor Install

POSITIVE LOCK@ CONNECTOR REMOVAL

Pushing the lever of positive lock@ connector.

H Termina’

Pull down the connector from the terminal. 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 PER-

SONAL) HAVE CONNECTED THE POSITIVE LOCK@ CONNECTOR TO THE TERMINAL, THE POSITIVE LOCK@’ CONNECTOR HAS BEEN LOCKED.

Figure C-4. Positive lock@ connector

CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS

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

Remove the single (1) screw holding the control panel to the oven cavity. Lift up the control panel assembly and pull it forward. Now, the control panel assembly is free.

Page 32

R-4X55

FMX5SB

POWER SUPPLY CORD REPLACEMENT (FOR AUSTRALIA MODEL)

Removal

1. CARRY OUT 3D CHECKS.

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

3. Remove the connector CE-230 by cutting the con-

nected 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

Insert the power supply cord into the cord anchorages. Connect the brown wire of the power supply cord to the fuse holder.

Install the green/yellow wire of the power supply cord to the oven cavity with the single (1) screw tightly. Make sure that the blue wire and the white wires are stripped for 15 mm length as shown illustlation. Wind the conductors of Blue and White wires each other. Insert the stripped wire leads into the connector CE-

230.

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

Blue wire lead of

power supply cord

main wire harness

Connector CE-230

Cord anchorage 1

Power supply cord

Main harness

Green/Yellow wire

konnector CE230

Figure C-5 Power Supply Cord Replacement

(For Australia Model)

POWER SUPPLY CORD REPLACEMENT (FOR NEW ZEALAND MODEL)

Removal

CARRY OUT 30 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 anchor-

ages to the oven cavity.

Remove the power supply cord.

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

after replacing power supply cord.

Re-install

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 4R CHECKS

UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH REMOVAL

CARRY OUTa CHECKS. Remove the air duct from the oven cavity.

5. Remove the two (2) screws holding the latch hook to

Disconnect the main wire harness and switch harness

the oven cavity.

from the control panel.

6. Remove the latch hook.

Disconnect the leads from all switches.

7. Push the retaining tab slightly and remove the switch.

Figure C-6. Power Supply Cord Replacement

(For New Zealand Model)

Page 33

R-4H5.5 R-4X55 R-PX55B

UPPER LATCH SWITCH, LOWER LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT

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

CARRY OUT 3D CH&&

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

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 face. The re-

sults (plays of the door) should be less 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.

5. Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter. (Refer to Microwave Measure ment Procedure.)

LATCH

MONITOR

HOOK \

, SWITCH

LEJ

SWITCH

Figure C-7 Latch Switches Adjustment

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. Release the door assembly from the upper oven hinge.

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 correctly.

DOOR ADJUSTMENT

When removing and/or loosening hinges such as in door

replacement, the following adjustment criteria are taken. Door is agjusted to meet the following three conditions by

keeping screws of hinge loose.

LOWER LATCH SWITCH

LATCH ____----

1. Adjust door latch heads at a position where they smoothly catch the latch hook through the latch 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.)

ER E

CABINET

Figure C-8. Door Assembly Replacement and Adjustment

Page 34

CHOKE

Insert

COVER REMOVAL

an iron plate(thickness of about OSmm) or flat

type screw driver to the gap between the choke cover

and door panel as shown in the figure to free the engag-

ing part. Lift up the choke cover, now cover is free.

Ii!

FLAT TYPE

l-l

SCREW-DRIVER

PROTECT BY TAPE

Figure C-9. 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 cloth 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 ar-

row shows in the figure C-10, and release the latch head from the holes in the door panel Release the latch spring with the latch head from the

tabs of the door panel.

Release the latch spring from the latch head.

Now, the latch head is free.

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-i 0.

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.

Door

Panel\‘* fp

Latch ’ ’

head

Tab of the door panei

Figure C-10. Latch head removal and reinstall

SEALER FILM

Removal

1. Tear the sealer film from the door panel.

2. Now, the sealer film is free.

Installation

1. Put the adhesivetape on the backing film of the sealer film.

2. Tear the backing film by pullingthe adhesivetape.

3. Put the pasted side of the sealer film on the door panel.

Sealer film

Backing film

Sealer film

Page 35

MICROWAVE MEASUREMENT

After adjustment of door latch switches, monitor switch and doorare completed individually or collectively, the fol-

lowing leakage test must be performed with a survey in-

strument 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 ofthe oven.

PREPARATlbN FOR TESTING:

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

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

Important: Survey instruments that comply with the requirement

for instrumentations as prescribed by the performance

standard for microwave ovens must be used for testing.

Recommended instruments are: NARDA 8100 NARDA 8200 HOLADAY HI 1500

SIMPSON 380M

2. Place the oven tray into the oven cavity.

3. Place the load of 275 +15ml of water initially at 20 +5X in the center of the oven tray. The water container

should be a low form of 600 ml beaker with inside diameter of approx. 8.5cm and made of an electrically

non-conductive material such as glass or plastic.

The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.

4. Close the door and turn the oven ON with the timer set

for several minutes. If the water begins to boil before the survey is completed, replace it with 275ml of cool water.

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

along the gap.

6. The microwave radiation emission should be measured

at any point of 5cm or more from the external surface of the oven.

Microwave leakage measurement at 5 cm distance

Page 36

NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND

R- 4X55B

I’ 1

’ F

Y P

F P

iu’

I.-TTN Tm

TzE i Ij :Cni

zh-i 6’ -- -’ ozi

g, 121

(

ODL-

--; 5;

c% --1

-- I

/--\

;lWI

._A

Figure O-l(a). Oven Schematic-OFF Condition (For Australlia model)

NOTE: WEIGHT SENSOR IS USEDFOR MODEL R-4X55 AND

R- 4X55B

Figure 0-2(a). Oven Schematic-ON Condition (For Australlia model)

Page 37

F ::

Figure O-l(b). Oven Schematic-OFF Condition (For New Zealand model)

&$j

L-J

.3?

b-b-3 55n

0 Fa

g; ’

str

3 22

Figure 0-2(b). Oven Schematic-ON Condition (For New Zealand model)

Page 38

il-

4 2

%-.

i?g

cii3 55

I-.-

1 I 2 I

3 I 4 I

5 I 6

Page 39

R-4H55 R-4X55 A-4X558

1 I

I 3 I

I I

J+Y

Kc9

Z30 WC

:g’D

-4

-0: j

$2 !F

aa 3

d ?a

20 a5

Page 40

R-4X55 R-lX55.B

1 I

3 I

-I 9’ m/lit 53 I:,

iW1SID’O ,3 N ,

---I

: ‘<

ZYii

z;r=

ASZ/“I. (3

*, G-e

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c ;

Z” I

XI Zd

ISE,~OOPI 13 +---I

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-J=i

hOP,dI’O r,

-I

[I:!;

, - - - _ _ _ _,

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$7 i

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Page 41

R-4H55 R-4X65 R-4X558

1 I

4”

I I?1 HH~!‘lIr

y--J i-p-J--l i E 7

\z I

- >^ -

a,a B a

>ogge

u!P 4EB

Y”

it T

.Ep IA

I 5

Page 42

Figure S-5. Printed Wiring Board

1 I

I 5

Page 43

PARTS LIST

R-4H55 R-4X55 R-4X55B

Note: The voltage supllied to the part “*” are greater than 25OV.

REF. NO.

PART NO.

DESCRIPTION

W-Y CODE

ELECTRICAL PARTS

I- 1 I- 2 I- 3 L- 4 l- 5 L- 6 l- 6 l- 7 l- 8

l- 9

l-10

l-11

l-12 1-13 1-14 1-14 1-15 l-15 1-16 l-17 1-18 1-19 l-20 1-21

QFS-TA014WREO QFSHDA002WREO QSW-MAlllWREO QSW-MAllOWREO RTHM-AO57WREO

__--

QACCAAO38WREO QACCAAO39WREO FWQZAO7OWRKO

RC-QZAO75WREO

QSOCLAOllWREO

RLMPTA029WREO

QFS-CAOlOWREO

RMOTEA255WREO RTRN-A288WREO RV-MZAO89WREO RV-MZA108WREO RMOTDA133WREO RMOTDAl75WREO RR-WZAO03WREO QSW-MAllOWREO QSW-MAllOWREO

FPWBFA232WRKO FDTCTAl15WRKO FDTCTAl39WRKO

Temp. fuse 150-C (MG) 1 Fuse holder (For Australian Model)

1 Monitor switch (V-16G-2C25(R)) 1 Upper latch switch (V-16G-3C25(R))

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

-Powersuppiy..co;h-iForAustralian Modei ,--~----1

Power supply cord (For New Zealand Model)

H.V. rectifier assembly 1 High Voltage capacitor 1 Oven lamp socket

Oven lamp

Fuse M8A

Fan motor

Power transformer

Magnetron (For Australian Model) Magnetron (For New Zealand Model)

1 1 11

Turntable motor [R-4H551

Turntable motor [R-4X55, R-4X55Bl

Monitor resistor 0.8R 20W

Lower latch switch (V-l6G-3C25(R) 1

1 1

Stan switch (V-16G-3C25(R))

Noise filter (For New Zealand Model) 1

AH sensor assembly

Weight sensor assembly [R-4X55, R-4X55Bl 1

AG AF AK AK AG Ax Ax AY

AU AH AL AE BB BM BF EG BE AM AG AK AK Aw

CABINET PARTS

2- 1 2- 2 2- 2 2- 3

2- 4 2- 5 2- 5 2- 6

FHNG-A172WRTO

Lower oven hinge

GCABUA415WRPO

Outer case cabinet [R-4H55, R-4X551

GCABUA429WRPO

Outer case cabinet [R-4X55Bl

MHNG-A28OWRTO

Upper oven hinge

PCOVPA249WRPO

Turntable motor cover

PCAPHA015WREO

Cabinet cap [R-4H55, R-4X551

PCAPHA009WREO

Cabinet cap [R-4X55Bl

GLEGPAO23WREO Foot

AM BE BE AM AK AD AC AC

CONTROL PANEL PARTS

3- 1

CPWBFA53OWRKO

Control unit (New Zealand only) [R-4X55,R-4X55Bl 1 BT

3- 1

CPWBFA529WRKO

Control unit (Not Replaceble Item) [R-4H551

3- 1A QCNCMA234DREO

$-pin connector (A)

1 AC

3- 1B QCNCMA275DREO 2-pin connector (B)

1 AB

3- 1c QCNCMA237DREO

3-pin connector (F)

1 AD

3- 1D QCNCWAO30DREO

12-pin connector (G)

1 AE

3- 1E QCNCMA039DREO

3-pin connector (C) 1 AB

3- 1E RV-KXA037DREO Fluorescent display tube

Cl RC-KZA087DREO Capacitor O.luF 5ov

1 AA

VCEAB31VW108M Capacitor 1OOOuF 35V 1 AF

vCEAB31EW476M

Capacitor 47uF 25V

1 AA

c4 VCKYBllEX153N Capacitor 0.015uF 25V

1 AA

VCEAB31CW476M

Capacitor 47uF 16v

1AA C6-7 VCKYDllCY103N Capacitor O.OluF 16V 2 AA C8 VCTYF31EF1042

Capacitor O.luF 25V

1AE Cl0

RC-KZA087DREO

Capacitor

O.lLlF 5ov

1AA

Cl3

RC-KZA087DREO Capacitor

O.luF 5ov

1 AA c20 VCKYDllCYlO3N Capacitor O.OluF 16V 1AA

c21 VCTYF31HF103Z Capacitor O.OluF 50V 1 AA c30

RC-KZA087DREO

Capacitor O.luF 50V[R-4X55,R-4X55B] 1 AB

c31

VCEAB31CW476M Capacitor

47uF 16V

1AA

C60 VCKYDllCY103N

Capacitor O.OluF 16V 1AA

c70

RC-KZA127DREO

Capacitor 0.15uF SOV(TF) [R-4X55,R-4X55Bl 1 AA

c71

VCKYDllCY103N

Capacitor O.OluF 16V[R-4X55,R-4X55B] 1AA

C80 VCEAB31HW104M

Capacitor

O.luF 50V

1 AM

C81

VCEAB3lVW475M Capacitor

4.7uF 35v

1AA

Cl00

RMPTEA009DREO

Capacitor array 330pF x 4 1 AE

CFl

RCRS-AOl2DREO

Ceramic resonator CST4.OOMGW

1AD

Dl-4

VHDllESl///-1

Diode (11ESl) 4 AB

D60-61

VHDlSS270A/-1

Diode (lSS270A)

2 AA

Page 44

WH55 R-4X55 R-4X550

Note: The voltage supllied to the pat-l “*” are greater than 250V.

REF. NO. 1 PARTNO.

DESCRIPTION

1 Q’TY ICODI

D70

VHDlSS27OA/-1

Diode (lSS270A) [R-4X55,R-4X55B]

1AA

D81-82

VHDlSS27OA/-1

Diode (lSS270A)

2 AT4

D91-92

VHDlSS27OA/-1

Diode (lSS270A)

2 AA

D94-98

VHDlSS27OA/-1

Diode (lSS270A)

5 AA

ICl

RH-IZA506DREO

LSI

1 AV

IC2

RHIZA310DREO IC

1AL

IC3

RH-IZA337DREO

IC (x24COlCP) [R-4XSS,R-4X55B]

1 AK

IC4

RH-IZA426DREO

IC (TL082CP) [R-4XSS,R-4X55B]

1AE

VS2SB793///-4

Transistor (2SB793)

1 AC

0 02

VSDTA143ES/lB

Transistor (DTA143ES)

1 AA

VS2SA933S//-3

Transistor (2SA933S)

1AA

Q80

VSDTA114YS/-3

Transistor (DTA114YS)

1AB

Q81

VSDTD143ES/-3

Transistor (DTD143ES)

1 AC

Q82

VSDTB143ES/-3 Transistor (DTB143ES)

1AB

($10-113 VS2SC174OS/-3

Transistor (2SC174OS)

4 AA

VRD-B12EF432J Resistor 4.3k ohm

1/4w

1AA

VRD-B12EF102J Resistor

lk ohm 1/4W[R-4X55,R-4X55B]

1AA

VRD-B12EF152J Resistor 1.2k ohm

1/4W[R-4H55] 1AA

RI?

VRD-B12HF621J Resistor 620 ohm

1/2W[R-4X55,R-4X55B] 1 AA

R.3

VRS-B13AA621J Resistor 620 ohm

lWTR-4H55] 1AB

VRD-B12HF751J Resistor 750 ohm

1/2w

1AA

R5 VRD-B12EFlO2J Resistor

lk ohm 1/4w

1AA

R6 VRD-B12EF153J Resistor 15k ohm

1/4w

1AA

VRD-B12HF51OJ Resistor 51 ohm 1/2W[R-4X55,R-4X55B]

1AA

R20

VRD-Bl2EF153J

Resistor 15k ohm

1/4w

1 AA

R30

VRD-B12EF332J Resistor 3.3k ohm 1/4w

1AA

R31

VRD-B12EFl03J Resistor 10k ohm 1/4W[R-4X55,R-4X55B] 1AA

R32

VRD-Bl2EF272J Resistor 2.7k ohm 1/4W[R-4X55,R-4X55B] 1AA

R33 VRD-B12EF332J

Resistor 3.3k ohm 1/4w 1AA

R40 VRD-B12EF332J

Resistor 3.3k ohm 1/4w 1A.A

R41

VRD-B12EFlOZJ Resistor

lk ohm 1/4w 1AA

R51

VRS-Bl3AA331J Resistor

330 ohm 1w

1AA

R60 VRD-B12EF512J

Resistor 5.lk ohm

1/4w 1AA

R61 VRD-Bl2EFlOlJ

Resistor

100 ohm 1/4w

1AA

R70-71

VRD-B12EF106J

Resistor

1OM ohm 1/4W[R-4X55,R-4X55B] 2 AA

R72

VRN-B12EK683J

Resistor

R73

68k ohm(F) 1/4W[R-4X55,R-4X55B]

1AA

VRN-Bl2EK244F

Resistor

1AA

R74

'VRN-B12EK683F

240k ohm(F) 1/4W[R-4X55,R-4X55B]

Resistor

1AA

R75

68k ohm(F) 1/4W[R-4X55,R-4X55B]

VRN-B12EK244F

Resistor

R76-77

240k ohm(F) 1/4W[R-4X55,R-4X55B]

1PA

VRNB12EKl53F

Resistor 15k ohm(F) 1/4WTR-4X55,R-4X55B]

R78

2 AA

VRNB12EK752F

Resistor

R79

7.5k ohm(F) 1/4W[R-4X55,R-4X55B]

1AA

VRD-B12EF473J

Resistor

47k ohm

R80

1/4W[R-4X55,R-4X55B]

1AA

VRD-B12EF471J

Resistor

470 ohm

1/4w

R91-92

1AA

VRD-B12EF103J

Resistor

10k ohm

1/4w

R94-98

2 AA

VRD-B12EFl03J

Resistor

10k ohm

1/4w

RlOO-103 VRD-Bl2EF103J

5 AA

Resistor

10k ohm

1/4w

R104

RR-DZA143DREO

4 AA

RllO-113 VRD-Bl2EF104J

Resistor array 150k ohm x 4

Resistor 1OOk ohm

1/4w

RYl

RRLY-A080DREO

4 AA

Relay (OJ-SH-124LM)

RY2

RRLY-A076DREO

Relay (OMIF-S-124LM)

. .

SP40

RALM-A014DREO.

1 AK

Buzzer (PKM22EPT-CA THAI)

RTRNPA064DREO

1 AG

Transformer

VRSl

RH-VZAOlODREO

Varistor (TNRl5G471K)

1AS

ZDl

VHEHZ6A3///-1

1AE

Zener diode (HZ6A-3)

ZD2

VHEHZ183///-1

ZD2

VHEHZ161///-1

Zener diode (HZ18-3) [R-4X55,R-4X55B] Zener diode (HZ16-1) [R-4H55]

1AH

ZD3

RH-EZA105DREO

3- 2

Zener diode (RD4.3ESB2)

1AA

FPNLCB023WRKO

3- 2

FPNLCB024WRKO

Control Panel frame with key unit[R-4X55]

1AA

Control Panel frame with key unit[R-4H55]

1BC

3- 2

FPNLCB037WRKO

lE?C

3- 3

JBTN-A817WRFO

Control oanel frame with key unit[R-4X55B]

1BC

3- 3

Gpen button[R-4H55,R-4X55]

J-BIN-A818WRFO

1AK

3- 4

Open button[R-4X55B]

MSPRCAOSOWREO

Open button spring

1AL

3- 5

XEPSD30PlOXSO

Screw;Control unit mounting

1AB

3 AA

OVEN PARTS

4- 1

LBNDKAO38wRPO

4- 2

Capacitor

holder

LSTPPA069WRFO

Cord anchorage (upper)

1AH 1AE

Page 45

Note: The voltage supllied to the part ,,*‘I are greater than 25OV.

REF. NO.

PART NO.

DESCRIPTION

Q’TY CODE

4- 3 LSTPPA070WRFO Cord anchorage (lower) 1 AD 4- 4 FDAI-A15OWRYO Bottom plate 1 AY 4- 5 PDUC-A406WRFO Air duct 1 AK

4- 6 PHOK-A076WRF0 Latch hook 1 AQ 4- 8 FDUC-A222WRYO Sensor duct 1 AG

a- 'I

PCUSUA23'IWRPO Waterproof cushion

1 AF 4- 9 FOVNA21OWRTO Oven cavity [R-4H551 1 BK 4- 9 FOVNA259WRTO Oven cavity [R-4XSS,R-4X55B] 1 BP 4-10 PCUSUA368WRPO Cushion 1 AK

4-11

MLEVPAl66WRFO

Latch lever

1AE 4-12 FROLPAO47WRKO Roller stay 1 AW 4-13 NTNT-A036WREO Turntable 1 Ax

4-14

GFTA-AOO8WRWO

Oven lamp access cover

1AF 4-15 NCPL-A015WRFO Turntable coupling 1 AD

4-17

PCOVPA212WREO

Waveguide cover

1AF 4-18 PCUSUA157WRPO Cushion 1 AC

4-19

PCUSUA300WRPO

Cushion

1Ai-l 4-20 PPACGA096WREO O-ring 1 AG

4-21

PFILWA041WREO

Oven lamp filter

1AA 4-23

PGIDHAO44WRPO

Magnetron air guide

1AM 4-24

LANGQAl67WRMO

Earth angle (For New Zealand Model)

1AB 4-25

LANGQA288WRPO

Noise filter angle (For New Zealand Model)

4-26 PCUSGA322WRPO Cushion 2 AF 4-27

PCUSGA321WRPO

Cushion

1AH 4-28

PCUSUA278WRPO

MG cushion

1AF 4-29 PCUSGA339WRPO Trans. cushion 2 AG 4-30 NFANJAO2OWREO Fan blade 1 AG 4-31 PDUC-A468WRFO Fan duct 1 AR

4-32

LANG-AO4lWRPO

Weight sensor support [R-4X55,R-4X55B]

1 AU 4-33 PCUSUA369WRPO Cushion [R-4X55,R-4X55B] 1 AM

DOOR PARTS

CDORFA589WRKO

Door assembly, complete.[R-4H55,R-4X55]

1BN

CCORFA596WRKO

Door assembly, complete.[R-4X55Bl

1BN

5- 1 FCORFA226WRTO Door panel [R-4H55,R-4X55] 1x 5- 1 FCORFA229WRTO Door panel [R-4X55B] 1BG 5- 2 GCOVHA233WRFO Choke cover [R-4H55,R-4X55] 1AK 5- 2 GCOVHA228WRFO Choke cover [R-4X55B] 1AF 5- 3 LSTPPA093WRFO Latch head [R-4H55,R-4X55] 1AF 5- 3 LSTPPA090WRFO Latch head [R-4X55B] 1AF 5- 4 MSPRTAl14WREO Spring 1AD 5- 5 HPNL-A515WREO Door screen [R-4H55,R-4X55] 1AX 5- 5 HPNL-A498WREO Door screen [R-4X55B] 1 AU 5- 6 PSHEPA336WRPO Sealer film 1AF 5- 7 GWAKPA238WRFO Door frame [R-4H55,R-4X55] 1AX 5- 7 GWAKPA239WRFO Door frame [R-4X55B] 1 Aw

MISCELLANEOUS

6- 1 TCAIXA439WRRO Cook book 1AX 6- 2 TINS-A388WRRO Instruction book [R-4H55] 1 AQ

6- 2 TINS-A387WRRO Instruction book [R-4X55,R-4X55B] 1AP 6- 3 TCAUHA185WRRO Microwave caution (New Zealand Model) 1 AG

6- 4

QTANPOOZOYBEO

Connector CE-230 (Australian model)

1AA

6- 5

QW-QZA14lWREO Hiqh voltaqe wire A

1AH 6- 6 TCAUHAO55WRRO Caution label 1AF 6- 7 TLABSAO29WRRO M8A label (Australian Model) 1 AC 6- 8 FW-VZB137WREO Main wire harness (Australian Model) 1 AY 6- 8 FW-VZB138WREO Main wire harness (New Zealand Model) 1 AY 6- 9 FW-VZB139WREO Low voltage harness 1AM 6-10 TSPCNB88OWRRO Rating label [R-4H551 1 AG

6-10

TSPCNB876WRRO Rating label [R-4X55; Australian Model3

1 AG 6-10 TSPCNB879WRRO

Rating label [R-4X55; New Zealand Model]

1 AG 6-10 TSPCNB916WRRO Rating label [R-4X55B] 1 AG 6-11

TGANA069WRRO Guarantee card (Australian Model)

6-11 TGAN-A002WRRO

Guarantee card (New Zealand Model)

1AB 6-12

LBNDKAO8OWREO

Wire holder B [R-4X55,R-4X55B]

1AD 6-13 TLABMA351WRRO

Menu label [R-4H55]

1AH 6-13

TLABMA35OWRRO Menu label [R-4X55,R-4X55B]

1AH

Page 46

Note: The voltage supllied to the part “*” are greater than 25OV.

REF. NO.

PART NO.

DESCRIPTION

Q’TY CODE

6-14

UAMI-AO83WRFO

Defrost rack [R-4X55,R-4X55B]

1AS

6-15 LHLDWAO13WREO

Purse lock LL [R-4X55,R-4X55B]

6-16

LBNDKAO49WREO

Wire tight

1 AB

6-17

PTUBUAO03WREO

Tube 110

1AF

6-18

PTUBUAOO4WREO

Tube 220

1 AK

SCREWS, NUTS AND WASHERS

7- 1 XFPSD3OPlOOOO

Screw; M3 x 10 zinc plated steel(Australian Model)

1 AB

7- 2

XOTSD4OP12RVO

Screw; M4 x 12 9 AB

7- 2 XOTSD4OP12RVO

Screw; M4 x 12 (New Zealand Model)

9 AB

7- 3

XOTSD40P12000

Screw; M4 x 12

7 AA

7- 5

XFTSD4OP3OOOO

Screw; M4 x 30 zinc plated steel

1AA

7- 6

LX-CZ0052WREO

Special

screw;

2 AA

7- 7 LX-EZA036WREO

Special screw

2 AA

7- 8

XOTSE4OPO8000

Screw; M4 x 8 [R-4H55,R-4X55] 4 AB

7- 8 XOTSF40P08000

Screw; M4 x 8 [R-4X55B] 4 AB

7- 9

XFPSD30P06000

Screw; M3 x 6 zinc plated

steel

4 AA

7-10

XFPSD4OP08KOO

Screw; M4 x 8 zinc plated steel (Australian Model) 2 AA

XFPSD40P08KOO

Screw; M4 x 8 zinc plated steel(New Zealand Model) 3 AA

7-11

XFPSD4OP08000

Screw; M4 x 8 zinc plated steel [R-4H55] 6 AA

7-11 XFPSD40P08000

Screw; M4 x 8 zinc

7-12

plated steel [R-4X55,R-4X55B]

8 AA

XHTSD4OP08RVO

Screw; M4 x 8 zinc plated steel (Australian Model) 5 AA

7-12

XHTSD40P08RVO

7-13

Screw; M4 x 8 zinc plated steel (New Zealand Model)

6 AA

LX-WZA004WREO

Washer:

1AA

7-14 XBTSD4OPO8RVO

Screw: M4

x 8

1AA

7-18

XWHNZ40-05080

Washer;

1AA

7-20

XBTUW40P08000 Screw; M4 x a

1 AA

7-21 XCPSD30P08XOO

Screw; x

M3 8

7-22

2 AA

XBPSD4OP25000

Screw; M4 x 25

2 AA

7-23

XNESD40-32000 Nut;

2 AA

7-24

XWVSD40-05000

Washer:

7-25

1AA

XFTSD40PlOOOO Screw; M4 x 10

1AA

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER

3. PART NO.

2. REF. NO.

4. DESCRIPTION

PACKING AND ACCESSORIES

PACKING ADD KIT

-(cPAcBAI 13WRKO) 1

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I-----: -

1. (’

-_-.--

.- ~.

PACKING CASE

Page 47

OVEN AND CABINET PARTS

R-4HSS R-4X55 R-4X55B

Page 48

A-4H55 R-4X55 w4X55B

4 I

CONTROL PANEL PARTS

3-5

DOOR PARTS -

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Actual wire harness may be different than illustration.

3 I

‘93 SHARP CORP. (09KO 75E) Printed in Australia