SHARP R510BK, R-510BW Service Manual

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R-51

OBK

R-51OBW

SHARR

SERVICE MANUAL

S48MlllFWOBE

MICROWAVE

R-51 OK/R-51 OBW

the interest of user-safety the oven is to be restored

its original condition and only the parts

those specified should be used. WARNING TO SERVICE PERSONNEL:

ovens contain circuitry capable of producing very high voltage and current. following parts may result in a severe, possibly fatal electrical shock.(High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)

OVEN

MODELS

identical to

Microwave

Contact with the

SECTION

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY. BeforeServicing Warning to Service Personnel

Forewordandwaming

Specifications..........................................................................:::: : 4

General

Key Unit Layout

Operation Servicing and Troubleshooting Guide

Test Procedures.. TouchControlOutline

Component Replacement and Adjustment Procedure Microwave Measurement Procedure Wiring/Schematic Diagram

Parts .._................_....................._....__..............................:: : 38

PackingandAccessories..

Information

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Inside Front Cover Inside Front Cover

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PAGE

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29 34

SHARP ELECTRONICS CORPORATION

3 5

6 8

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

R-51OBK MIOBW

Do not operate or allow the oven to be operated with the door open.

Make the following safety checks on all ovens to be serviced before activating the magnetron

or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

Before turning on microwave powerfor any service test or inspection within the microwave gen-

(cl

erating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity, and connections.

Any defective or misadjusted components in the interlock, monitor, door seal, and microwave

generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.

A microwave leakage check to verify compliance with the Federal Performance Standard

should be performed on each oven prior to releasing the oven to the owner.

Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately Q l-800-237-4277.

(RDPiiOlU

If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and DHHS immediately.

Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.

,___.__....

(l-w81 Wl U)

SERVICE MANUAL

RBIOBK R-51 OBW

Microwave Ovens R-51 OBKIR-51 OBW

Foreword

This manual has been prepared to provide Sharp Electronics Corporation personnel with complete operation and service information for Sharp microwave oven models R-51 OEM/R-SlOBW.

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

Check interlock switches and the door seal carefully. Special attention must be given to avoid electrical shock and microwave radiation hazards.

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 are no other visible signs of damage to the

oven.

DANGER

Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing. Service personnel - Do not contact the following parts while the appliance is energized; High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly and High voltage Harness. If provided, Vent Hood, Fan Assembly and Cooling Fan motor.

Specifications

General Information

Key Unit Layout

Operation

Troubleshooting /

1 Test Procedurei

Touch Control Panel

Component Replacement

Microwave Measurement

All of the parts marked ages more than 250V.

Removal of the outer case cabinet gives access to voltage above 250V.

All of the parts marked “A” on parts list may cause undue

microwave exposure, by themselves, or when they are

damaged, loosened or removed.

“*” on parts list are used at volt-

Sharp Electronics Corporation

Sharp Plaza

Mahwah, New Jersey 07430-2135

Wiring I Schematic Diagram

Parts

R-51OBK R-5lOBW

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts may result in a severe, possibly fatal, electrical shock.

(EXAMPLE)

High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

Read the Service Manual carefully and follow all instructions.

Don’t Touch ! Danger High Voltage

Before Servicing

Disconnect the power supply cord and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

WARNING:RISK OF ELECTRICAL SHOCK. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING. The high-voltage capacitor remains charged about 60 se-

conds after the oven has been switched off. Wait for 60 se-

conds and then short-circuit the connection of the high voltage capacitor (that is the connecting lead of the high voltage rectifier) against the chassis with the use of an insulated screwdriver.

Whenever troubleshooting is performed, the power supply must be disconnected. In some cases it may be nec-

essary to connect the power supply after the outer case has been removed, in this event:

Disconnect the power supply cord and then remove

outer case cabinet.

Open the door and block it open.

Discharge the high voltage capacitor.

Disconnect the leads to the primary of the power

transformer.

Ensure that the leads remain isolated from other

components and oven chassis by using insulation

tape.

After the above procedure, reconnect the power supply cord.

When the testing is completed

Disconnect the power supply cord and then remove

outer case cabinet.

Open the door and block it open. Discharge the high voltage capacitor.

3. Reconnect the leads to the primary of the power

4. transformer. Re-install the outer case cabinet.

5. Reconnect the power supply cord after the outer

6. case cabinet is installed.

Start the oven and check all functions.

, .

After repairing

1. Reconnect all leads removed from components dur-

ing testing.

2. Re-install the outer case (cabinet).

3. Reconnect the power supply cord after the outer case is installed.

4. Reconnect the power supply cord after the outer case is installed.

5. Run the oven and check all functions. Microwave ovens should not be operated empty. To test

for the presence of microwave energy within a cavity,

place a cup of cold water on the oven turntable, close the door and set the power to HIGH and set the microwave

timer for two (2) minutes. When the two minutes has

elapsed (timer at zero), carefully check to see if the water is hot. If the water remains cold, carry out Before Servicing procedure and re-examine the connection to the component being tested.

When all service work is completed and the oven is fully

assembled, the microwave power output should be checked and the microwave leakage test should be carried out.

SPECIFICATIONS

R-51 OBK R-51 OBW

Item

Power Requirements

Power Output

Case Dimensions

Cooking Cavity

1.8 Cu.Ft.

Control Complement

Description

120 Volts

14.0 Amperes 1650 Watts 60 Hertz Single phase, 3 wire grounded

1100 watts (I EC-705 Test Procedure) Operating frequency of 2450 MHz

Width 23.94” Height 13.27” (including feet) Depth 19”

Width 17” Height 9.96” Depth 17.8” Tray Size 16” Diameter

Touch Control System Clock (1:OO - 1259) Timer (0 - 99 min. 99 sec.) Microwave Power for variable cooking

Repetition Rate; P-HI

(HIGH) . . . . . . . . .

P-90

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

P-80

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

P-70 (MED HIGH) . . . .

P-60

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

P-50 (MED) . . . . . . . . . .

P-40

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

P-30 (MED LOW) . . . . .

P-20

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

P-10

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

P-O . . . . . . . . . . . . . . . . . . .

Full power throughout the cooking time approx. 90% of full power approx. 80% of full power approx. 70% of full power approx. 60% of full power approx. 50% of full power approx. 40% of full power approx. 30% of full power approx. 20% of full power approx. 10% of full power

No power throughout the cooking time

Oven Cavity Light Safety Standard

FEATURES

Instant Action Compu Defrost(3) Minute Plus Timer/Clock Popcorn Variable Power (10) 4 Stage Cooking

Yes UL Listed

FCC Authorized DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

R-510BK R-5100W

GENERAL

Grounding Instructions

This oven must be fully grounded at all times. This appliance must be connected to a 120 volt, 60 Hz, AC only, 15 Ampere or more fused electrical supply. It is recommended that a separate circuit serving only this

appliance be provided. When installing this appliance,

observe all applicable codes and ordinances.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

Where a two-pronged wall-receptacle is encountered, it

is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly polarized and grounded threepronged wall receptacle or use a grounding adaptor. If an extension cord must be used, it should be a 3-wire,

15 ampere minimum cord.

INFORMATION

Gromded

Grounding Pin

3 Pmnged Recepfacie

Do not under any circumstances cut or remove the

round grounding prong from this plug.

Grourded

- .._ necepfacm Lx*

Tab for Grounding Screw

Oven

Diagram

Digital display

2. Auto-Touch control panel

3. Door open button

Door latches

5. Removable turntable support

Removable turntable

Oven lamp

Oven door with see through window

Waveguide cover

10.

Power Cord

Key Unit Layout

a. Indicators. b. Lighted digital display. c. SNACKS/COOKING/REHEATING pad.

Touch to cook or reheat popluar items using a pm-set time constant.

d. COMPU DEFROST pad.

Touch to defrost certain foods. e. Number selection pads. f. TIMER/CLOCK pad.

Touch to set clock and minute timer function. g. START/MINUTE PLUS pad.

Touch to start oven or Touch to cook for 1 minute at

100% power or to increase cooking time.

h. STOP/CLEAR pad.

Touch to erase during programming.

Touch once to stop operation of oven during cooking.

Touch twice to cancel cooking program. i. POWER LEVEL pad.

Touch to select microwave power setting.

-0

R-510BK R-51 OBW

I I

, 1

-0

INSTANT ACTION

To adjust quantity-touch pad again

2 ’ 3

cl-

5 6 -

R-5100K

R-SIOBW

Description of Operating Sequence

The following is a description of component functions

during oven operation:

OPERATION

interlock relay and is mechanically associated with

the door so that it functions as follows:

Off Condition

Closing the door activates the door sensing switch and secondary interlock switch. In this condition, the monitor switch contacts are opened. When the oven is plugged in, 120 volts AC is supplied to the control unit (see schematic diagram). The display flashes 88:88. To set any program or set the clock, first touch the STOP/ CLEAR pad. The display clears and “ : ” appears and the control unit counts every minute.

Cooking Condition

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

The relay contacts are closed and components con-

nected to the relays (Fly-1 and RY-2) are turned on. (For details, see table below.)

Oven Lamp/Turntable Motor/Fan Motor

120 volts AC is supplied to the primary winding of the power transformer and is converted to approximately 3.4 volts AC on the filament winding and approximately 2400 volts AC on the high voltage winding.

The filament winding voltage heats the magnetron

3. filament and the high voltage is sent to a voltage dou-

bler circuit.

The microwave energy produced by the magnetron

is channeled through the waveguide into the cavity feed-box and into the cavity where the food is cooked.

Upon completion of the cooking cycle, the power transformer, oven lamp and cooling fan are turned off and the generation of microwave energy is terminated.

When the door is opened during a cook cycle, the monitor switch, door sensing switch, secondary interlock switch and primary interlock relay are activated with the following results. The turntable motor, cooling fan motor and the high voltage components are de-energized. The oven lamp remains on and the digital readout displays the time still remaining in the cook cycle when the door was opened.

The monitor switch is electrically monitoring the operation of the secondary interlock switch and primary

When the door opens from a closed position, the

(a).

secondary interlock switch and primary interlock relay open their contacts, then the monitor switch contacts close.

When the door is closed from the open position,

04.

the monitor switch contacts first open and the contacts of the secondary interlock switch close.

secondary interlock switch and the primary inter-

If the lock relay contacts are closed when the door is opened, the monitor switch contacts form a short circuit through the monitor fuse, secondary interlock switch and primary interlock relay causing the monitor fuse to blow.

. . _.

Power Level P-O to P-90 Cooking

When Variable Cooking Power is programmed, 120 volts AC is supplied to the power transformer intermittently through the contacts of relay RY-2 which is operated by the control unit within a 32 second time base. Mi- crowave power operation is as follows:

Vari-Mode

P - HI (HIGH)

(100% power)

P - 90 (approx. 90% power)

P - 80 (approx. 80% power)

P - 70 (MED, HIGH) (approx. 70% power)

P - 40 (approx. 40% power)

P - 30 (MED, LOW) (approx. 30 % power)

P - 20 (approx. 20% power)

I-

P-10 (approx. 10% power)

L$power)

The ON/OFF time ratio does not correspond with the percentage of microwave power, because approximately 2 seconds are needed for heating the magnetron filament.

On Time

32 sec.

30 sec.

26 sec.

24 sec. 8 sec.

16 sec. 16 sec.

12 sec.

8 sec.

6 sec.

0 sec.

Off Time

0 sec.

2 sec.

6 sec.

20 sec.

24 sec.

26 sec.

32 sec.

DESCRIPTION AND FUNCTION OF COMPONENTS

R-SlOBK R-51OBW

Cooling Fan Motor

The cooling fan motor drives a blade which draws exter-

nal cool air. This cool air is directed through the air vanes surrounding the magnetron to cool the magnetron. This air is channeled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted through exhaust vents in the oven cavity.

Oven Temperature Fuse

The oven temperature fuse located on the top of the oven cavity is designed to prevent damage to the unit if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of con-

trol unit.

Under normal operation, the oven temperature fuse re-

mains closed. However, when abnormally high temperatures are reached within the oven cavity, the fuse will open at 152%, causing the oven to shut down.

Note: This is a fuse and it does not reset.

Magnetron Temperature Fuse

The magnetron temperature fuse located on top of the

magnetron duct is designed to prevent damage to the

magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc.

Under normal operation, the magnetron temperature fuse remains closed. However, when abnormally high temperatures are reached within the magnetron the fuse will open at 121 “C, causing the oven to shut down.

Note: This is a fuse and it does not reset.

Monitor Switch

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative by

means of blowing the monitor fuse when the contacts of the primary interlock relay and secondary interlock switch fail to open when the door is opened.

Monitor Switch Functions

When the door is opened, the monitor switch contacts close (to the ON condition) due to their being normally closed. At this time the primary interlock relay and secondary interlock switch are in the OFF condition (contacts open) due to their being normally

open contacts. When the door is closed, the monitor switch contacts

are first opened and then the door sensing switch and the secondary interlock switch contacts close.

Note: When opening the door, each of these

switches operate inversely.

If the door is opened and the primary interlock relay

3. and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

and secondary interlock switch for proper operatron. (Refer to section ‘Test Procedures”.)

Door Open Mechanism

The door is opened by pushing the open button on the control panel. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch heads. The latch heads are moved upward and released from

the latch hook. Now the door will open.

Door Sensing / Secondary Interlock

Switches

The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to all components, except the oven lamp. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches. The primary interlock system consists of the door sensing switch and the primary interlock relay located on the control panel circuit board.

NOTE: MONITOR FUSE AND MONITOR SWITCH

ARE REPLACED AS AN ASSEMBLY.

RQlOBK R-51oBW

SERVICING

When troubleshooting the microwave oven, it is helpful to follow the sequence of operation in performing the checks.

Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure

letter which will be found in the “Test Procedure” section.

Before replacing a blown monitor fuse, test the door sensing switch, primary interlock relay, secondary interlock switch and monitor switch for proper operation. (Referto rest Procedure” sec-

tion.)

Whenever troubleshooting is performed, the power supply must be disconnected. In some cases it may be necessary to connect the power supply after the outer case cabinet has been removed. In this event,

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the leads remain isolated from other components and oven chassis by using insulated tape.

6. After the above procedure, install the outer case cabinet and reconnect the power supply cord.

When the testing is completed

1. Disconnect the power supply cord, and then remove outer case

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Reconnect the leads to the primary of the power transformer.

5. Re-install the outer case (cabinet).

6. Reconnect the power supply cord after the outer case is installed.

7. Run the oven and check all functions.

Troubleshooting Guide

Off Condition

Problem Possible Cause

Home fuse blows when power cord is Shorted power cord or wire harness Check or replace plugged into the wall receptacle.

Monitor fuse blows when power is ap- Shorted power cord or wire harness Check or replace

plied.

Secondary interlock or monitor switch

Display does not illuminate when Shorted or open wiring power cord is plugged in.

Monitor switch or monitor fuse Oven temperature fuse Control unit

Display does not operate properly Primary interlock relay or door sens- Procedure E when STOP/CLEAR button is ing switch touched.

Control unit Key unit unit

Oven lamp does not light with door Shorted or open wiring opened.

Monitor fuse Oven temperature fuse Oven lame or socket Control unit Relay (RYI)

Procedure E

Check or replace Procedure E Procedure F Procedure G

Procedure G Procedure K Check or replace Procedure E Procedure F Check or replace

1 Procedure G

/ Procedure H

Test Procedure

Problem

Oven lamp does not light at all.

Oven lamp lights, but fan motor and turntable motor do not operate.

Oven does not go into cook cycle when START button is touched.

cooked at all at the end of cook cycle.)

Troubleshooting Guide

Cook Condition Possible Cause

Shorted or open wiring Oven lamp or socket Control unit Shorted or open wiring Cooling fan motor Turntable motor Shorted or open wiring Primary interlock system Monitor fuse Magnetron

or oven temperature

Test Procedure

Check or replace Check or replace Procedure G Check or replace Check or replace Check or replace Check or replace Procedure E Procedure E Procedure F

R-SIOBK

MIOBW

P-50 (MED.) mode. (Operates

property on Cooking Power P-HI

(HIGH) mode.)

Oven goes into COMPU DEFROST Magnetron but food is not defrosted well

Wrong operation

Low voltage Dirty oven check

Compu Defrost

Procedure A Check Check Check Procedure J

R-51 OBK R-5lOBw

TEST PROCEDURES

Procedure Letter

Magnetron Assembly Test

1. Disconnect the power supply cord, and then remove outercase cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

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

5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate an infinite resistance. If there is little or no

resistance, the magnetron is grounded (shorted) and must be replaced.

6. Reconnect all leads removed from components during testing.

7. Re-install the outercase cabinet.

8. Reconnect the power supply cord after installing the outer case cabinet.

9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

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

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED

Power output of the magnetron can be measured by performing a water temperature rise test. This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring: high voltage rectifier, high voltage capacitor and power transformer. This test will require a 16 oz. (453~~) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure must be followed:

Fill the measuring cup with 16 oz. (453~~) of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester.

through the water until the temperature stabilizes. Record the temperature of the water.

Place the cup of water in the oven. Operate oven on HIGH selecting 62 seconds cook time. Allow

the water to heat.

Remove the cup from the oven and again measure the temperature, making sure to stir the ther-

mometer or thermocouple through the water until the maximum temperature is recorded.

Subtract the cold water temperature from the hot water temperature. The normal result should be 38” to 78°F (21’ to 42.6%) rise in temperature. If the water temperatures are accurately measured and are tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power output (high rise in water temperature) which would reduce cook time. time can be adjusted to compensate for power output, the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits. The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean.

Component Test

Stir the thermometer or thermocouple

Because cooking

Power Transformer

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohm-

meter. Check for continuity of the coils with an ohmmeter. On the R X 1 scale, the resistance of

the primary coil should be less than 1R and the resistance of the high voltage coil should be approx-

imately 100Q; the resistance of the filament coil should be less than IQ.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions. Note: High voltages are present at the high voltage terminal, so do not attempt to measure the fila-

ment and high voltage.

TEST PROCEDURES

R-51OBK R-51 osw

Procedure Letter

High Voltage Rectifier Test

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

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

the rectifier is probably defective and should be replaced.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions. Note: Be sure to use an Ohm-Meter that will supply a forward bias voltage of more than 6.30 Volts.

High Voltage Capacitor Test

(Discharge the high voltage capacitor before touching any oven components or wiring.)

1. Disconnect the power supply cord, and then remove outercase.

2. Open the door and block it open.

3. Discharge the high voltage capacitor. 4 If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads

and check for short or open between the terminal using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity initially and once the capacitor is charged an open circuit. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between each terminal and case. If it is shorted, replace the capacitor.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

Component Test

Secondary Interlock Switch Test

1. Disconnect the power supply cord, and then remove outercase.

2. Open the door and block it open.

3. Discharge the high voltage capacitor. 4 Isolate the switch and connect the ohmmeterto the common (COM) and normally open (NO) termi-

nal of the switch. The meter should indicate an open circuit with the door open and a closed circuit

with the door closed. If improper operation is indicated, replace the secondary interlock switch.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

Primary Interlock System Test

Door

1. Disconnect the power supply cord, and then remove outercase.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Isolate the switch and connect the ohmmeterto the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the door sensing switch.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

R-51 OBK

R-51 OBW

TEST PROCEDURES

Procedure Letter

E. Continued

Primatv Interlock Relay (RY-2)

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect two (2) wire leads from the relay on the printed circuit board in the control panel assembly. The relay is located on the bottom portion of the circuit board on the backside of the control panel assembly. Connect an ohmmeter to the male terminals and observe the meter reading. The relay contacts should be open. or the circuit board.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions.

Monitor Switch Test

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4 Disconnect the oven from the power supply.

Before performing this test, make sure that the secondary interlock switch and primary interlock relay are operating properly referring to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows: When the door is open, the meter should indicate a closed circuit. With the door open, take a screw driver and push in the monitor switch actuator located through the lower latch hole on the faceplate of the cavity. The meter should indicate a open circuit. If improper operation is indicated, the monitor switch may be defective and should be replaced. After testing the monitor switch, reconnect the wire lead to the monitor switch (NC) terminal and check continuity of the monitor circuit.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions.

Component Test

If the relay contacts are closed, replace the primary interlock relay

TEST PROCEDURES

Procedure Letter Component Test

FkSlOBK

R-SlOBW

Continued

Open Monitor Fuse

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4 If the monitor fuse is open, perform the tests for the primary interlock system, secondary interlock

switch and the monitor switch according to the procedure outlined in this section. Adjust or replace

the secondary interlock and door sensing switches.

When replacing a monitor fuse, make sure that the monitor switch is also replaced at that time.

FFS-BA016/KIT

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions.

Replace monitor fuse and monitor switch with Part#

Temperature Fuses

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. A continuity check across either of the temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron temperature fuse reaches 121 “C or the oven cavity fuse reaches 152%. An open magnetron temperature fuse indicates overheating of the magnetron assembly while an open oven fuse indicates overheating of the oven cavity. indicates an open circuit, exchange that temperature fuse and check for a restricted air duct, stricted air flow to the magnetron and oven cavity through the vent holes of the oven cavity, especially the air duct and cooling fan assembly.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet.

8. Run the oven and check all functions.

If a temperature fuse

re-

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 can not be performed with only a voltmeter and ohmmeter. control units, Control Unit and Key Unit. Troubleshooting by unit replacement is described according to the symptoms indicated.

Before testing

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that these leads remain isolated from other components and oven chassis by using insu-

lated tape.

6. After that procedure, re-connect the power supply cord.

In this service manual, the touch control panel assembly is divided into two

R-51csK R-51oBW

TEST PROCEDURES

Procedure Letter

Continued

Touch Control Panel Assembly Test

1. Key Unit

1. Disconnect the power supply cord, and then remove outer case cabinet

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Check unit ribbon connection before replacement.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase (cabinet).

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions. The following symptoms indicate a defective 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.

If the key unit is defective.

1. Disconnect the power supply cord, and then remove outercase cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Replace the key unit.

5. Reconnect all leads removed from components during testing.

6. Re-install the outercase cabinet.

7. Reconnect the power supply cord after the outer case is installed.

8. Run the oven and check all functions.

2. Control Unit The following symptoms indicate a defective control unit. Before replacing the control unit, perform

the Key unit test (Procedure K) to determine if control unit is faulty.

2-l In connection with pads.

2-2 In connection with indicators.

2-3 Other possible problems caused by defective control unit.

When testing is completed,

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Reconnect all leads removed from components during testing.

5. Re-install the outercase cabinet.

6. Reconnect the power supply cord after installing the outer case cabinet.

7. Run the oven and check all functions.

Component Test

Replace the key unit.

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.

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) All the segments of a digit flicker.

a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible.

TEST PROCEDURES

Procedure Letter Component Test

H. Relay Test

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the leads remain isolated from other components and oven chassis by using insulated tape.

6. After the above procedure , reconnect the power supply cord.

7. Check voltage between Pin No. 1 of the 2 pin connector (A) and the common terminal of the relay RY2 on the control unit with A.C. voltmeter. The meter should indicate 120volts. If not, check oven circuit.

RY-1 and RY-2 Relay Test

These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

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

DC. voltage not indicated . . . . . . . . . . . . . . . . . . .

Check diode which is connected to the relay coil. If diode is good, control unit is defective.

R-51OBK R-SIOBW

Relay Symbol RY 1

RY2

8. Disconnect the power supply cord.

9. Open the door and block it open.

10. Discharge the high voltage capacitor.

11. Reconnect all leads removed from components during testing.

12. Re-install the outer case cabinet.

13. Reconnect the power supply cord after installing the outer case cabinet.

14. Run the oven and check all functions.

Operational Voltage

Approx. 13.0 V DC Approx. 12.0 V DC

Connected Components

Oven lamp/Turntable motor/Cooling fan motor Power transformer

I. Foil pattern on the printed wiring board Test

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, which acts as a fuse.

1 Foil Pattern check and repairs

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Follow the troubleshooting guide given below for repair.

Steps Occurrence

Only pattern at “a” is broken.

2 Pattern at “a” and “b” are broken

Cause or Correction

l Insert jumper wire Jl and solder. l Insert the coil RCILF~ OO~YAZZ between “6 and “d”.

R-HOBK

R-SOBW

TEST PROCEDURES

Procedure Letter Component Test

Continued

Procedures to be taken when the foil pattern of the printed wiring board (PWB) is open

5. Make a visual inspection of the varistor bum

damage and test the transformer with an ohmmeter for the presence of layer short-circuit (check the primary coil resistance which is approximately 575 Q f 15%). If any abnormal condition is detected, replace the defective

part(s).

6. Reconnect all leads removed from components during testing.

7. Re-install the outercase (cabinet).

8. Reconnect the power supply cord after installing the outer case cabinet.

9. Run the oven and check all functions.

2. Follow the troubleshooting guide given below. repairs are finished.

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that the leads remain isolated from other components and oven chassis by using insulated tape.

6. After the above procedure, reconnect the power supply cord.

7. Follow the troubleshooting guide given below for repair.

If indicator does not light up after above check and

Steps Occurrence

The rated AC voltage is not present between Check supply voltage and oven power cord Pin No.1 of the a-pin connector (A) and the common terminal of the relay RY2 .

2 The rated AC voltage is present at primary

side of low voltage transformer.

Cause or Correction

Low voltage transformer or secondary circuit

defective. Check and repair.

8. Disconnect the power supply cord, and then remove the outer case.

9. Open the door and block it open.

10. Discharge the high voltage capacitor.

11. Reconnect all leads removed from components during testing.

12. Re-install the outer case cabinet.

13.Reconnect the power supply cord after the outer case cabinet is installed.

14. Run the oven and check all functions.

R-51OBK R-51OBW

Procedure Letter

J Compu Defrost Test

1. Place one cup of water in the center of the turntable tray in the oven cavity.

2. Close the door, touch the “COMPU DEFROST” pad once and touch the number pad “5”. Then touch the “START” pad.

3. The oven is in “COMPU DEFROST’ cooking mode.

4. The oven will operate as follows:

Weight

0.5 70% 30 sec. 0% 30 sec.

5. If improper operation is indicated, the control unit is probably defective and should be checked.

Key Unit Test

1. Disconnect the power supply cord, and then remove outer case cabinet.

2. Open the door and block it open.

3. Discharge the high voltage capacitor.

4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact and verify that the door sensing switch operates properly (contacts are closed when the door is closed and open when the door is open). disconnect the flat ribbon cable 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 door sensing switch connector). 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.

responds by clearing with a beep the key unit is faulty and must be replaced. not respond, it is faulty and must be replaced.lf a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or pad is at fault.

5. Reconnect all leads removed from components during testing.

6. Re-install the outer case cabinet.

7. Reconnect the power supply cord after installing the outer case cabinet

8. Run the oven and check all functions.

1 st Stage 2nd Stage

Level Time Level Time Level

Component Test

3rd Stage

Time

50% 25 sec.

If the door sensing switch is good,

4th Stage

Level

30%

If the control unit

If the control unit does

Time

28 sec.

1 1 G8

KEY UNIT

G4 /

G3 1 G2

/ Gl

R-510BK R-51 OBW

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units as shown in the touch control panel circuit: (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and LSI unit).

The principal functions of these units and their related signals 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 P73, P81, P82, P83, P90 and P91. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P60-P63 to perform the function that was requested.

Control Unit

The Control unit consists of the following:

1. Synchronizing Signal Circuit The Power source synchronizing signal is available in order to compose a basic standard time in the

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

2. ACL Circuit A circuit to generate a signal which resets the LSl to the initial state when power is applied.

Buzzer Circuit

3. The buzzer is responsive to signals from the LSI to

emit Audible sounds (key touch sound and comple-

tion sound).

Door Sensing Switch

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

Relay Circuit

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

Indicator Circuit

6. This circuit consists of 12 segmenets and 3 common electrodes using a liquid Crystal Display.

Back Light Circuit

A circuit to drive the back light (Light emmitting diodes LDl -LD5).

Power Source Circuit

8. This circuit generates voltage necessary in the control unit from the AC line voltage. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

Symbol Voltage Application vc -5v LSI (IClI.

DESCRIPTION OF LSI

LSI

The l/O signals of the LSI are detailed in the following table.

R-510BK R-51 OBW

Signal l/O

SEG 0

SE; 11

R60

R61

R62

R63

AINO

AlNl-AlN3

vss

R70

OUT Segment data signal.

IN Signal coming from touch-key.

IN Signal similar to R60.

OUT

Description

Connected to LCD.

The relation between signals are as follows:

LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.)

SEG 0 . . . . . . . . . . . . . . . . . . . . S12

SEG 1 . . . . . . . . . . . . . . . . . . . . Sll

SEG 2 . . . . . . . . . . . . . . . . . . . . SlO

SEG 3 . . . . . . . . . . _ . . . . . . . . . S9

SEG 4 . . . . . . . . . . . . . . . . . . . . . S8

SEG 5 . . . . . . . . . . . . . . . . . . . . . S7

SEG 6 . . . . . . . . . . . . . . . . . . . . . S6

SEG 7 . . . . . . . . . . . . . . . . . . . . . S5

SEG 8 . . . . . . . . . . . . . . . . . . . . . S4

SEG 9 _ _ . . . . . . . . . . . . . . . . . . . S3

SEG 10 . . . . . . . . . . . . . . . . . . . . . S2

SEG 11 . . . . . . . . . . _ _. . . . . . . . . Sl

LCD (Pin No.)

When either G-12 line on key matrix is touched, a corresponding signal out of R73. R81-R83 and R90-R91 will be input into R60. When no key is touched, the signal is held at “H” level.

Signal similar to R60. When either G-l 1 line on key matrix is touched, a corresponding signal will be inputted into R61.

When either G-l 0 line on key matrix is touched, a corresponding signal will be inputted into R62.

When either G-9 line on key matrix is touched, a corresponding signal will be inputted into R63.

To input signal which communicates the door open/close information to the LSI.

Door close “L” level signal (OV) Door open “H” level (5V).

Terminal to change functions according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant.

Power source voltage: + 5V

VSS voltage of power source circuit input.

Magnetron high-voltage circuit driving signal.

To turn on and off cook relay RY2. In high operation, the signals holds “H” level during microwave cooking and “L” level while not cooking. In other cooking modes (variable cooking) the

signal turns to “H” level and “L” level in repetition according to the power level.

PULSE

OUT

__________-__________ ++eND

P-HI

P-70

24 sec.

4 *-

asec.

(ON and OFF times for other power level)

Signal to sound Buzzer (2.0 kHz).

0.1 sec.

OFF

L:-5V

H: GND

L+sV

B: completion sound

R-51 OBK R-51 OBW

Signal l/O Description

R72

OUT

Oven lamp, fan motor and turntable motor driving signal.

To turn on and off driving

R73

OUT

Key strobe signal.

Signal applied to

of G8 line keys on key matrix is touched.

INT2

Signal synchronized with

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

shut off relay RYl

circuit and RY-2 control circuit.

16.7 msec.

Dwing

touch-key section. A pulse signal is inputted to R60-R63 terminal while one

commercial

The square waveform voltage is delivered to the Fly-1

coohng

power source frequency.

Ii: +5v

GND

16.7 msec.

- _ _ _

R81

OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is inputted to R60-R63 terminal while one of G7 line keys on key matrix is touched.

R82

OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is inputted to R60-I?63 terminal while one of G6 line keys on key matrix is touched.

R83

OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is inputted to R60-R63 terminal while one of G5 line keys on key matrix is touched.

R90

OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is inputted to R60-R63 terminal while one

of G4 line keys on key matrix is touched.

R91

OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is inputted to R60-R63 terminal while one

of G3 line keys on key matrix is touched.

R92

XIN

OUT

Terminal not used.

Internal clock oscillation frequency setting input.

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

XOUT

OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

RESET IN Auto-clear terminal.

Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to

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

HOLD

VLC IN

IN/OUT Connected to GND.

Signal synchronized with commercial power source frequency.

Signal similar to VSS.

COMl OUT Common data signal: COMl_

Connected to LCD (Pin No. Cl).

COM2

OUT Common data signal: COM2.

Connected to LCD (Pin No. C2).

COM3

OUT Common data signal: COM3.

Connected to LCD (Pin No. C3).

COM4 OUT Terminal not used.

VDD

Power source voltage input terminal

Connected to GND.

SERVICING

Precautions for Handling Electronic

Components

This unit uses CMOS LSI in the integral part of the cir-

cuits. 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 in-

fluenced by surrounding high voltage power sources,

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, practice the following

guidelines:

1. When storing and transporting LSI, thoroughly wrap

them in aluminum foil. Also wrap all PW boards in aluminum foil.

2. When soldering, the technician should use a grounding strap as shown in the figure and use a grounded soldering iron and work table.

Approx.lMi2

Shapes of Electronic Components

R-510BK RSlOBW

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.

2. 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 repairthe 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.

Servicing The Touch Control Panel With An External Power Supply

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 activates an operational state that is equivalent to the oven

door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor (s).

Servicing of Touch Control Panel

We describe the procedures to permit servicing of the

touch control panel of the microwave oven and the pre-

cautions 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.

Servicing The Touch Control Panel With The Oven Power Supply

The high voltage transformer of the microwave oven

is still live durina servicina and oresents a hazard.

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 insulating tape. After servicing, be sure to re-connect the leads to their original locations.

1. On some models, the power supply cord between the touch control panel and the oven itself is so short that

Senricing Tools

Tools required to service the touch control panel assembly.

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

grounding terminal.)

2. Oscilloscope: DC-1 OMHz type or more advanced model.

3. Hand tools.

Single beam, frequency range:

Other 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 precision is required.

R-51 OBK R-51oeW

COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with the following parts may result in severe, possibly fatal, electric shock. Example

High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness

etc..

oid possible exposure to microwave energy. Please follow the

instructions below before operating the oven.

5. There are defective parts in the door interlock sys-

2. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.). Carry out any remedial work that is necessary before operating the oven.

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

1. Door does not close firmly.

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

3. The door gasket or seal is damaged. 3. If the door is not closed.

4. The door is bent or warped.

tern.

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:

1. Without the RF gasket (Magnetron).

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

4. If the outer case cabinet is not fitted.

To prevent electric shock, take the following precautions.

1. Before wiring.

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) Discharge the high voltage capacitor and wait for 60 seconds.

2. Don’t let the wire leads touch the following parts;

1) High voltage parts: Magnetron, High voltage Transformer, High volt-

age capacitor and High voltage rectifier assembly.

2) Hot parts: Oven lamp, Magnetron, High voltage Transform-

er and oven cavity.

3) Sharp edge: Bottom plate, oven cavity, waveguide, flange, chassis support and other metallic plate.

4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch , Switch lever, and Open button.

3. Do not catch the wire leads in the outer case cabinet.

4. Insert the positive lock connector until its pin is locked and make sure that the wire leads do not come off even if the wire leads are pulled.

5. To prevent an error function, connect the wire leads correctly, referring to the Wiring Diagram.

COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE

Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’ When carrying out any of the following removal procedures:

Outer Case Removal

left portion of rear cabinet using a T20H Torx type or GTXH20-100 screw driver.

1. Disconnect power supply cord before removing

~ outer case cabinet.

2. Discharge the high voltage capacitor before

To remove the outer case, proceed as follows.

1. Disconnect the power supply cord.

2. Open the oven door and block it open. Remove the two screws (2) from the upper and lower

Power Transformer Removal

Remove the two screws (2) from the rear of outer case. Slide the entire case back about 1 inch (3cm) to free it from retaining clips on the cavity face plate. Lift entire case from the unit.

When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.

R-51OBK RQlOBW

Disconnect the power supply cord and remove outer case cabinet.

Open the oven door and block it open.

Discharge high voltage capacitor.

Disconnect wire leads of the main wire harness and H.V. wire from power transformer. Disconnect the lead from magnetron filament.

5. Disconnect the leads of the power transformer from

6. high voltage capacitor.

Remove the four (4) screws holding the transformer to base plate.

Remove the transformer.

High Voltage Rectifier and High Voltage

Capacitor Removal

When replacing the high voltage rectifier and high volt-

age capacitor, the ground side terminal of the high

voltage rectifier must be secured firmly with a ground-

ing screw.

(RDAl504U)

Disconnect the power supply cord and remove outer case cabinet.

Open the oven door and block it open. Discharge high voltage capacitor.

Remove one (1) screw holding the capacitor band

9. Now the power transformer is free. Re-install

Rest transformer on baseplate with its primary terminals toward oven face plate. Secure transformer with four (4) screws to base-

2. plate. Reconnect the wire leads (primary and high volt-

3. age) to transformer and filament leads of transformer

to magnetron and high voltage capacitor. Refer to

‘Wiring Diagram”.

Re-install outercase cabinet and check that oven is

4. operating properly.

and the high voltage rectifier assembly to the base elate.

5. Disconnect the wire lead of high voltage rectifier assembly from the magnetron.

6. Disconnect terminals of rectifier assembly from capacitor and magnetron. High voltage rectifierassembly is now free.

Do not replace only high voltage rectifier. When replacing it, replace the entire high voltage rectifier assembly.

Magnetron Removal

Disconnect the power supply cord and remove outer case cabinet.

Open the oven door and block it open.

Discharge high voltage capacitor.

Disconnect wire leads from the magnetron.

Remove the one (1) screw holding chassis support to magnetron and magnetron duct. Slide the magnetron duct slightly so that two (2) screws at left hand

side of the magnetron appear. Carefully remove the four (4) screws holding magne-

6. tron to waveguide flange.

Remove the magnetron with care so that the magne-

tron antenna is not hit by any metal objects around the tube. Now, the magnetron is free.

R-510BK R-510BW

COMPONENT

REPLACEMENT / ADJUSTMENT PROCEDURE

Magnetron Installation

1 When reolacina the maanetron. be sure that the RF.

gasket is in p&e and that the’mounting screws are

tightened securely.

Install magnetron assembly to the waveguide flange

Control Panel Assembly Removal

Disconnect the power supply cord and remove outer case cabinet.

Open the oven door and block it open.

Discharge high voltage capacitor.

Disconnect wire leads from panel components.

Remove the one (1) screw holding the control panel.

Readjust the clip holding panel assembly to oven

flange.

Remove control panel assembly by sliding it upward.

Now, individual components can be removed.

Oven Lamp and Lamp Socket Removal

Disconnect the power supply cord and remove outer

case cabinet.

Open the oven door and block it open.

Discharge high voltage capacitor.

Pull the wire leads from the oven lamp socket with

the flat type small screw driver.

Remove the oven lamp socket from the magnetron duct by turning the socket counterclockwise. Pushing the small tab of magnetron locating the left hand

Turntable Motor

(RDA1305U)

Do not drop the turntable motor cover into the oven after cut-

ting the bridges. Because it will damage the wire leads of the

motor and it is difficult to remove it out of the oven.

1. Disconnect the power supply cord.

2. Remove turntable and turntable support from oven cavity.

with care to prevent damage to the magnetron tube.

2. Secure the magnetron with four (4) screws.

3. Hold the chassis support to the magnetron and mag-

netron duct with one (1) screw.

4. Connect wire leads to the magnetron .

5. Re-install outer case and check that the oven is oper-

ating properly.

NOTE:

Before attaching a new key unit, remove remaining adhesive on the control panel frame surface completely with alcohol.

When attaching the key unit to the control panel frame, adjust the upper edge and right edge of the key unit to the correct position of the control panel.

Stick the key unit firmly to the control panel frame by rubbing with soft cloth.

side of lamp socket.

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

7. Remove the oven lamp from the oven lamp socket by turning the oven lamp.

Now, the oven lamp and lamp socket are free.

Note: (orange) wires must be connected to the terminal with

blue mark on the lamp socket.

Removal

Lay the oven on its backside. Remove the turntable

3. motor cover by snipping off the material in four corners.

When the comers have been snipped off, bend the comer areas flat. No sharp edges must be evident after removal of the turntable motor cover.

Disconnect wire leads from turntable motor.

Remove two (2) screws holding turntable motor to

6. oven cavity. Now turntable motor is free.

TURNTABLE

,-3 ROTATE 7

CUTIING PLIERS

TURNTABLE

MOTOR COVER

3EW Supplied with lacement motor

Turntable motor cover removal Turntable motor cover re-install

R-51OBK R-SlOBW

COMPONENT

REPLACEMENT / ADJUSTMENT PROCEDURE

Turntable Motor Re-install

Remove any sharp edges on the turntable motor cover and the base plate with cutting pliers. Insert the edge of motor cover into tab on the base

2. plate.

Cooling Fan Motor Removal

1. Disconnect the power supply cord and remove outer

case cabinet.

2. Open the oven door and block it open. Discharge the high voltage capacitor.

4. Disconnect the wire leads from the fan motor. Remove two (2) screws holding the fan motor to the

5. back plate of the oven cavity. Remove the fan blade from the fan motor shaft ac-

6. cording to the following procedure.

a) Hold the edge of the rotor of the fan motor by using

a pair of groove joint pliers.

Make sure that no metal pieces enter the gap between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may

3. Secure motorcoverwith one (1) screw to base plate.

INSTALLATION

Install the fan blade to the fan motor shaft according

to the following procedure

Hold the center of the bracket which supports the shaft of the fan motor on the flat table.

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

Install the fan blade to the shaft of the fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

not hit the fan blade hard when installing because

bracket may be disfigured.

blade rotates smooth after

b) Remove the fan blade from the shaft of the fan mo-

tor by pulling and rotating the fan blade with your hand.

c) Now, the fan blade will be free.

Do not use this removed fan blade again because the hole (for shaft) may become bigger than a standard

one.

Groove joint pliers

Side View

Install the fan motor to the back plate of the oven cavity with two (2) screws.

Connect the wire leads to the fan motor, referring to

the wiring diagram.

_ rnw are the positiins

which should be pinched w%l priers

R-BlOBK RQlOBW

COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE

Door Sensing Switch/Secondary Interlock Switch and Monitor Switch Adjustments

Disconnect the power supply cord and remove outer case cabinet. Open the oven door and block it open.

2. Discharge the high voltage capacitor.

3. If the door sensing switch, secondary interlock

switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

Loosen the two (2) screws holding the latch hook to

the oven cavity front flange. With the door closed, adjust the latch hook by moving

2. it back and forth, and up and down.

In and out play of the door allowed by the upper and

lower position of the latch heads should be less than

0.5mm. The vertical position of the latch hook should be placed where the door sensing switch and the secondary interlock switch have activated with the door closed. Secure the screws with washers firmly.

3. Make sure of the door sensing switch operation. If

4. the door sensing switch has not activated with the door closed, loosen the screw and adjust the latch hook position. Check operation of all switches. If each switch has

5. not activated with the door closed, loosen screw and adjust the latch hook position.

Note: After adjustments, make sure of the following:

1. In and out play of the door remains less than OSmm when in the latched position. Check the upper position of the latch hook by pushing and pulling the upper portion of the door.

Then check lower portion of the latch hook, by pushing

and pulling the lower portion of the door toward the oven face. Both results (play of the door) should be less than OSmm. The door sensing and secondary interlock switches

2. interrupt the circuit before the door can be opened.

Monitor switch contacts close when door is opened. Re-install outer case and check for microwave leakage around the door with an approved microwave survey meter. (Refer to “Microwave Measurement Procedure.“)

Door Sensing Switch /Secondary Interlock Switch and Monitor Switch Removal

Disconnect the power supply cord and remove outer case cabinet. The door sensing and secondary interlock switches

2. interrupt the circuit before the door can be opened. Discharge high voltage capacitor.

Disconnect wire leads from switches, fuse and connectors from control panel. Remove one (1) screw holding control panel to oven

5. cavity faceplate. Slide control panel assembly upward and remove

from cavity faceplate.

Open oven door. Remove two (2) screws holding the latch hook to

oven flange. Remove latch hook from oven flange by lifting up on

flexible tab and pushing latch hook back.

10. Locate the flexible retaining tabs on the latch hook.

11. Push tab inward and rotate switch counterclockwise to release switch.

Note: For monitor switch, lift switch over boss while ro-

tating counterclockwise.

12. Switch is now free.

Pivot Point

To release switch. push inward on fkdble retaining tab and rotate switch counte~se.

Caution: Apply only slight pres-

surs to retamg tabs to avoid breakage.

DOOR DISASSEMBLY

R-51OBK

R-51 OBW

Removal

1. Disconnect the power supply cord.

2. Push the open button and open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and comer portion of door panel as shown in the figure below to free engaging parts .

4. Pry the lever and lift up the choke cover by inserting a putty knife in the order as shown in the figure below.

5. Release choke cover from door panel.

6. Now choke cover is free from door panel.

7. Release two(2) pins of door panel from two (2) holes of upper and lower door hinges by lifting up.

8. Now, door panel is free from oven cavity.

9. Release door panel from eight (8) tabs of door frame and remove door frame.

lO.Now, door panel with sealer film is free.

11. Tear sealer film from door panel.

12.Now, door panel is free.

13.Slide latch head upward and remove it from door frame and latch head.

14.Now latch head and latch spring are free.

15. Remove door screen from door frame.

16.Now, door screen is free.

Re-Install

1. Re-install door screen to door frame.

2. Re-install latch spring to the head. Re-install latch spring to the door frame.

3. Re-install door panel to door frame by fitting eight (8) tabs of door frame to eight (8) holes of door panel.

4. Put sealer film on door panel. Refer to “Sealer Film

Installation” and on how to handle the new film.

5. Catch two (2) pins of door panel on two (2) holes of upper and lower door hinge.

6. Re-install choke cover to door panel by snapping on

to the door panel.

Note: After any service to the door

(A)Make sure that door sensing switch, secondary

Interlock switch, primary Interlock relay and monitor switch are operating property. (Refer to section “Test Procedures”.)

(B)An approved microwave survey meter should be

used to assure compliance with proper microwave radiation emission limitation standards.

After adjustment, make sure of th+ following:

1. Door latch heads smoothly catch latch hook through latch holes, and also latch head goes through the cen-

ter of the hole.

2. Deviation of door alignment from horizontal line of cavity face plate is less than 1 .O mm.

3. Door is positioned with its face depressed toward cav-

ity face plate.

4. Install the outer case cabinet and check for microwave leakage around the door with an approved microwave survey meter. (Refer to “Microwave Measurement Procedure”.)

Note: The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from the oven cavity during the cooking cycle. This function does not require that the door be airtight, moisture tight, or light tight. Therefore, the occasional appearance of moisture, light or sensing of gentle warm air movement around the oven door is not abnormal and does not indicate leakage of microwave energy from the cavity.

Sealer Film Installation

1. Put adhesive tape on the backing film of the sealer film as shown below.

2. Tear the backing film by pulling the adhesive tape.

3. Put the pasted side of the sealer film on the door pan-

el.

, Sealer film , Backing film

RdlOBK R-51OBW

MICROWAVE MEASUREMENT PROCEDURE

After adjustment of the door, interlock and monitor switches are completed individually or collectively, a INTERLOCK SWITCH TEST and MICROWAVE LEAKAGE TEST must be performed to assure compliance with DHHS (CDRH) Performance Standards for Microwave Ovens.

Interlock Switch Test

Make sure that the door sensing switch, secondary interlock switch and monitor switch are operating properly by checking with an ohmmeter.

Refer to the ‘Test Procedure” of the door sensing switch, secondary interlock switch and monitor switch.

Microwave Leakage Test

Requirements

1. Microwave leakage limit (Power density limit). The power density of microwave radiation emitted by a microwave oven shall not exceed 1 mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by the purchaser, and thereafter (through the useful life of the oven) 5mW/cm2 at any point 5cm or more from the external surface of the oven.

2. Safety interlock switches. Primary interlock relay and door sensing switch will

prevent microwave radiation emissions in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission or more from the external surface of the oven.

Preparation For Testing

Before beginning the actual measurement of leakage, proceed as follows:

1. Make sure that the actual instrument is operating nor-

mally as specified in its instruction booklet.

in excess of 5 mW/cm2 at any point 5cm

2. Place the oven tray in the oven cavity.

3. Place the load of 275 & 15ml(9.8 oz.) of tap water initially at 20 + 5’C (68OF) in the center of the oven cavity.

The water container shall be a low form of 660 ml (20 oz.) beaker with an inside diameter of approximately

8.5 cm (3 % in.) and made of an electrically nonconductive 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. Set the cooking control on High.

5. Close the door and put the oven into a cook cycle for several minutes. survey is completed, replace it with 275ml of cool water.

Leakage Test

Closed-door leakage test (microwave measurement).

1. Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.

2. Move the probe slowly, not faster than lin./sec (2.5cm/sec.) along the gap, watching for the maximum indication of the meter.

3. Check for leakage at the door screen, sheet metal

seams and other accessible positions where the continuity of the metal has been breached (eg., around switches, indicator and vents). While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly.

4. Measure carefully at the point of the highest leakage

and make sure that the highest leakage is no greater than 4 mW/cm2 to allow for measurement uncertainty, and that the secondary interlock switch does turn the oven OFF before any door movement.

If the water begins to boil before the

Note: Survey instruments that comply with the require-

ment for instrumentation 21 CFR1030.1 O(c)(3)(i),

as prescribed by the performance standard for

microwave ovens must be used for testing.

Note: After servicing, record data on service invoice

and microwave leakage report.

R-BIOBK

R-51OBW

-1

-4

R-51 OBK

R-51 OBW

-r

I I II I

R-51OBK R-51OBw

3 4

c C

D D

p&ABLE

KN LAMP

TURNTABLE

OVEN LAMP

MOTOR

MICRO

_ AC

NOTE

- : IF NOT SPECIFIED, 114~ f 5%

+ : IF

NOT SPECIFIED,

1 SS270

Power Unit Circuit

3 4

I?-51oBK R-510BW

2 3

4 5 6

I 2

3 4

R-SlOBK R-SlOBW

Printed Wiring Board of Power Unit

A I

5 I

R-51 OBK I?-SlOBW

PARTS LIST

Contact your nearest SHARP Parts Distributor to order.

For location of SHARP Parts Distributor, Please call Toil-Free;

l-800-BE-SHARP

1 Ref No. 1

t ---- ---- I

PartNo. 16 1

Descrbtion

Electrical

l- 1 RC-QZB018MREO M H.V. Capacitor

l- 2 FH-DZBOOEMRYO M H.V. Diode assembly l- 3 QSOCLB006MREO M Oven lamp socket l- 4 RLMPTAO68WREO l- 5 RMOTEA346WREO M Fan motor

l- 6 QFSHDB003MREO M Fuse block l- 7 FFS-BA016/KIT

l- 8 QSW-MAllOWREO l- 9 l-10 QFS-TBOOSMREO

1-11 RV-MZA255WREO 1-12 l-13 RTRN-BO59MREO l-14 FACCDBOO3MREO M Power cord l-15 QW-QZBO16MREO

1-16 FW-VZB150MRE0 l-17 FW-VZB125MREO

QFS-TBOOlMREO

RMOTDAlEZ/KIT

M Oven lamp

M Monitor switch (V-16G-2C25) & Fuse assembly 1

(20A-25OVAC) M Sec. interlock & Door sensing switch (V-16G-3C25) 2 M Magnetron Temperature fuse (l21'C) 1 M Cavity Temperature fuse (152°C) 1

M Magnetron M T.T. Motor M Power transformer

M H.V. wire A (Transformer - Capacitor) 1 M Main wire harness

M Stop switch harness

Oven

2- 1 LBNDKB007MRP0 2- 2 LANGTBO35MRPO M Chassis support 2- 3 PHOK-BO13MRFO M Latch hook 2- 4 2- 5

2- 6 2- 7 PDUC-BO73MRPO M Magnetron duct 2- 8 NFANPBOOlMREO M Fan blade 2- 9 PDUC-BO43MRFO M Fan duct 2-10

2-11 PCOVPB054MRPO M Waveguide cover 2-12 GCABUB069MRPO M Outer case cabinety (R-51OBK)

2-13 FROLPBO24MRKO M T.T. Roller assembly 2-14

2-15 PPACGBOllMRFO M T.T. Motor packing 2-16 PCUSUO464MREO M Base plate cushion 2-17

GDAI-BO51MRPO GLEGPB003MRFO

MLEVPB016MRFO

---______----------

GCABUBO68MRPO M Outer case cabinet (R-51OBW)

NTNT-BOOlMREO

PCUSUBO42MRPO

M H.V. Capacitor band

M Base plate M Foot

M Latch lever

- &en cavity (Not a renlaceable part)

M T.T. Tray

M Air flow cushion

1 Qtv /Code1

I ---a I

1 1 1 1 1

1 1 1 1

1 1

1 1 1 1 4

1 AD 1 1 1 1 -

1 AC 1 1 1 1

1 1 2

AQ AM

AE AE AR

AD AF

AE AF AF

BE AP BF AM AC

AU AF

AB AE AG AT AA

AG AC AD

AY AY AN AT

AA AA AA

Control Panel

3-1 3-1A 3-lB QCNCMA275DREO J 2-pin connector (CN-B) 3-1c QCNCMA422DREO

3-1D FW-VZBlQlMRE0 Cl

c2 c5 Dl-4

CPWBFBO23MRUO M Control unit QCNCMA446DREO

RC-KZA087DREO vCEAB31EWlOEM J Capacitor 1000pF 25V VCEAB~~VW~ 0 6~ VHDllESl///-1

J 2-pin connector (CN-A) 1

J g-pin connector (CN-C) 1

M Lead wire harness

J Capacitor

J Capacitor J Diode (11ESl)

O.&F 50V 1

(WH-1)

10CI.F 35V

1 2 4

BE AC AB AF AC

AB AD AB AB

R-51 OBK R-5100W

Ref No.

Part No. 5

Description

Control Panel

Ds-a VHDlSS27OA/-1 LDl-5

22 ;23

R3 VRD-B12HF680J R4 VRD-B12EF27OJ

R5 R6 VRD-B12EF332J RYl-2 RRLY-AllQDREO SPl RALM-AO14DREO

r1 RTRNPB016MREO VRSl RH-VZA032DREO 3-2 LHLD-B004MRFO 3-3 FPNLCB165MRKO 3L3 FPNLCB166MRKO

3-4 FUNTKBlZlMREO 3-4 3-5 3-5 JBTN'-B069MRFO 3-6

3-7 3-a

VHPSLZ381A9-3 vs2sBl238//-3

VSDTD143ES/-3

VRD-B12EF472J

FUNTKB122MREO JBTN-B064MRFO

MSPRTAO5OWREO PSHEPB023MREO

XEPSD3OPlOXSO

Diode (lSS270ATA)

Light emitting diode

Transistor (2SB1238)

Transistor (DTD143ES)

Resistor 68OQ'/2W

Resistor 27&l/4W

Resistor 4.7kR l/4W 1

Resistor 3.3kQ 1/4W Relay (DUlZDl-lPR(M))

Buzzer (PKM22EPT)

-t

Transformer

Varistor (104G471K)

LED holder

Control panel assembly (R-51OBK) 1

M M

Control panel assembly (R-510BW) 1

Key unit (R-510BK)

Key unit

Open Button (R-51OBK) Open Button

Button Spring

LED sheet

Screw; Control unit mtg.

(R-51OBW) 1

(R-51OBW)

Door

0 CDORFB183MRKO

0 CDORFB193MRKO

1 FCOV-BO94MRKOA

1 FCOV-BllIMRKOA

2 FDORFBO49MRTO

3 PSHEPB016MREO

4 GCOVHBO28MRFO

5 LSTPPBOZlMRFO

6 MSPRTA046WREO

7 HPNL-BO80MREO

7 HPNL-BO81MREO

Door assembly (R-51OBK)

Door assembly (R-510BW)

Door screen assembly(R-SlOBK)

Door screen assembly(R-SlOBW)

Door panel

Sealer film

i-r

Choke cover

Latch head

Latch spring

Door Screen (R-51OBK)

Door Screen (R-51OBW)

Miscellaneous

5- 1 1 TCAUABO15MRRO 1 M IMonitor caution label / 11

/ ;; ; 1

5- 4 TINSEB189MRRO

TCAUABO27MRRO TCAUAB033MRRO

1 ; ID$,S9;t:ze:abe1

M Operation manual

Qty Code

4 5 1 1 1

1 2 1

1 1 1

1 1

1 1 BE 1 1 BE 1 / AW 1 1 AW 1 1 1 AG 1 AE 1

-I-

I 1 IAH I 1 I=

11 /

AC AA AC

AA AA

AA AA AG

AG AN

AE AC AX AX

AR AR AE AE AA

AR AA

AX AD

6- 1 6- 2 6- 3 6- 4 6- 5

6- 6 6- 7 6- a 6- 9 6-10 6-11 6-11 6-12

Fasteners

LX-BZAO41WREO 1 1 M Screw: Base plate mtg. LX-CZOO52WREO M Screw; Latch hook XHTSDIOPlZRVO M Screw; Power cord mtg. LX-BZ0081YBEO M Screw; H.V. Capacitor mtg.& Magnetron mtg. XOTSD4OP12000 M Screw;

XCPSD30P08000 / M IScrew; T.T. Motor mtg. XCBSD30P08000 XHTSD40P08000 LX-CZA038WREO XHTSD4OPO8RVO XOTSF40P12000 XOTSE40P12000 LX-CZBOllMREO M Screw;

Power transformer mtg., Chassis support &

Base plate.

UL O.C. Cabinet

R-51 OBK

R-51

OBW

Cavity Assembly

R-51

OBW

Control Panel Assembly

L~____________~_______~_~_~_~_~~

________J,

----

OBK

R-51

R-5106W

Wire Harnesses

Packing and Accessories

Actual

harnesses may

different than

illustrations.

* TRAY PACK

Non-mplaceabie

items.

* PACKING CASE

‘980 SHARP CORP. (5M2.7E) Printed in U.S.A.

SHARP R510BK, R-510BW Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

Foreword

WARNING TO SERVICE PERSONNEL

Before Servicing

When the testing is completed

After repairing

SPECIFICATIONS

Grounding Instructions

Key Unit Layout

Description of Operating Sequence

OPERATION

Off Condition

Cooking Condition

DESCRIPTION AND FUNCTION OF COMPONENTS

Cooling Fan Motor

Oven Temperature Fuse

Magnetron Temperature Fuse

Monitor Switch

Monitor Switch Functions

Door Open Mechanism

Off Condition

TEST PROCEDURES

Monitor Switch Test

Open Monitor Fuse

Before testing

H. Relay Test

I. Foil pattern on the printed wiring board Test

J Compu Defrost Test

OUTLINE OF TOUCH CONTROL PANEL

Key Unit

Control Unit

DESCRIPTION OF LSI

SERVICING

Shapes of Electronic Components

Servicing The Touch Control Panel With An External Power Supply

Servicing of Touch Control Panel

Servicing The Touch Control Panel With The Oven Power Supply

Other Precautions

COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE

Outer Case Removal

Power Transformer Removal

Magnetron Removal

Magnetron Installation

Control Panel Assembly Removal

Oven Lamp and Lamp Socket Removal

Turntable Motor Re-install

Cooling Fan Motor Removal

Door Sensing Switch/Secondary Interlock Switch and Monitor Switch Adjustments

Door Sensing Switch /Secondary Interlock Switch and Monitor Switch Removal

DOOR DISASSEMBLY

Removal

Re-Install

Sealer Film Installation

MICROWAVE MEASUREMENT PROCEDURE

Interlock Switch Test

Microwave Leakage Test

Power Unit Circuit

Printed Wiring Board of Power Unit

PARTS LIST

Electrical

Oven

Control Panel

Door

Miscellaneous

Fasteners

Cavity Assembly

Control Panel Assembly

Wire Harnesses

Packing and Accessories