Sharp R-25JT-F User Manual

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Page 1

SERVICE MANUAL

S0513R25JTF//

COMMERCIAL

MICROWAVE OVEN

R-25JT-F

2100W/R-25JT

MODEL

S Q U

E C

ELE

T A

In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.

WARNING TO SERVICE PERSONNEL: Microwave ovens contain

R-25JT-F

circuitry capable of producing very high voltage and current, contact with 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..)

TABLE OF CONTENTS

Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO

AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER

BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER

WARNING TO SERVICE PERSONEL .................................................................................................................. 1

MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2

FOREWORD .......................................................................................................................................................... 3

PRODUCT SPECIFICATIONS .............................................................................................................................. 4

GENERAL INFORMATION ................................................................................................................................... 4

OPERATION .......................................................................................................................................................... 6

TROUBLE SHOOTING GUIDE/ TEST PROCEDURE ........................................................................................ 11

TOUCH CONTROL PANEL ................................................................................................................................. 21

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 31

PICTORIAL DIAGRAM ........................................................................................................................................ 37

CONTROL PANEL CIRCUIT ............................................................................................................................... 38

PRINTED WIRING BOARD ................................................................................................................................. 39

PARTS LIST ........................................................................................................................................................ 40

PACKING AND ACCESSORIES ......................................................................................................................... 45

SHARP CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice.

Page 2

R-25JT-F

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with the door open. (b) 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.

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

(d) 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.

(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release to the owner.

BEFORE SERVICING

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 @1-800-237-4277.

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 the Food and Drug Administration's Center for Devices and Radiological Health 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.

Page 3

WARNING TO SERVICE PERSONNEL

Don't Touch ! Danger High Voltage

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts fatal, electrical shock.

(Example) High Voltage Capacitor, High Voltage Power Trans-

former, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

Read the Service Manual carefully and follow all instructions.

may result in a severe, possibly

R-25JT-F

Before Servicing

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

WARNING: RISK OF ELECTRIC SHOCK.

DISCHARGE THE TWO HIGH VOLTAGE CAPACITORS BEFORE SERVICING.

The high-voltage capacitors remain charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the highvoltage capacitors (that are the connecting lead of the highvoltage rectifiers) against the chassis with the use of an insulated screwdriver.

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

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

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 insulation tape.

6. After that procedure, 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 two high voltage capacitors.

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

5. Reinstall the outer case (cabinet).

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

7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components during testing.

2. Reinstall the outer case (cabinet).

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

4. Run the oven and check all functions.

Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power to HIGH and set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out Before Servicing procedure and re-examine the connections 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 microwave leakage test should be carried out.

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R-25JT-F

MICROWAVE MEASUREMENT PROCEDURE

A. Requirements:

1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/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 shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

B. Preparation for testing: Before beginning the actual measurement of leakage, proceed as follows:

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

Important: Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.

2) Place the oven tray in the oven cavity.

3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity. The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 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 Full Power Cooking Mode

5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace it with 275 ml of cool water.

C. 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 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on 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 the 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 highest leakage and make sure that the highest leakage is no greater than 4mW/cm

, and that

the secondary interlock switch does turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.

Page 5

SERVICE MANUAL

COMMERCIAL

MICROWAVE OVEN

R-25JT-F

PRODUCT DESCRIPTION

R-25JT-F

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-25JT-F.

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

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

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 no other visible damage with the oven.

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

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

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, High Voltage Harness; If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

All the parts marked “*” on parts list are used at voltages more than 250V.

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

All the parts marked “∆” on parts list may cause undue microwave exposure, by themselves, or when they are damaged, loosened or removed.

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

PARTS LIST

Page 6

R-25JT-F

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 230/208 Volts 3.2 kW

Approx. 15.5 A at 208 V / Approx. 14.5 A at 230 V 60 Hertz / Single phase, 3 wire grounded

Power Output 2100 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz

Case Dimensions Width 20-1/8" (510mm) Height 13-1/4" (335mm) Depth 18-1/2" (470mm)

Cooking Cavity Dimensions Width 13" (330mm) Height 7-1/8" (180mm) Depth 13" (330mm)

Control Complement Touch Control System

Digital Display 10 Number Pads

STOP/CLEAR pad START pad SELECTAPOWER pad (Power level: 0 to 100%) SELECTATIME pad DOUBLE QUANTITY pad EXPRESS DEFROST pad Memory SET pad Memory CHECK pad SIGNAL pad

Weight Approx. 68 lbs/ 31 kg

Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J NSF Certified

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

This appliance must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is properly installed and grounded.

WARNING: Improper use of the grounding plug can result in a risk of electric shock. The electrical requirements are 230/208 Volt,

60 Hz, AC only, and 20 Amp 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. If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade grounding plug and a 3-slot receptacle that will accept the plug on the appliance. The marked rating of the extension cord should be AC 230/208 Volt 20 Amp.

VOLTAGE SELECT

The oven has been preset for 230V operation. If you need to change this oven for 208V operation, follow instructions below.

1. Unplug oven.

2. Remove one screw(A) from the Voltage Select Cover located on back of the oven near the bottom.

3. Remove the Voltage Select Cover and rotate 180 degrees.

4. Reinstall the Voltage Select Cover using one screw(A) removed in Step 2.

5. Plug power cord into wall outlet.

Your oven is now ready for 208V, 60Hz operation. Note: If “EE4” or “EE5” appears in the lighted digital display, a voltage adjustment

must be made.

Power supply cord

Receptacle Box Cover

3-Pronged plug (6-20P)

3-Pronged, Receptacle (6-20R)

230 V

(A)

208 V

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OVEN DIAGRAM

R-25JT-F

1. Touch control panel

2. Door latch openings

3. Ceramic shelf

4. Splash cover

5. Oven light

6. Air intake filter

7. Air intake openings

8. Door seals and sealing surfaces

9. Door hinges

10.Oven door with see-through window

11.Door latches

12.Door handle

13.Service window for replacing the oven light bulb.

14.Ventilation openings

15.Power supply cord

16.Mounting plate

17.Screw for mouning plate

18.Voltage select cover

Control Panel

19.DOUBLE QUANTITY pad

20.EXPRESS DEFROST pad

21.Ten number pads for time and memory programming

22.SELECTATIME pad

23.STOP/CLEAR pad; touch to stop operation of oven and clear remaining heating time

24.SELECTAPOWER pad for setting variable power level

25.START pad; touch to operate oven after door is closed and time is set

26.SET pad for setting memory

27.CHECK pad for checking memory

28.SIGNAL pad for setting signal sound

678

DEFONNO.X2CHECK

22 24

DOUBLE

QUANTITY

SELECTATIME STOP/CLEAR

SELECTAPOWER

SET CHECK SIGNAL

EXPRESS DEFROST

START

23 25

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R-25JT-F

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

OFF CONDITION

Closing the door activates the door sensing switch and secondary interlock switches (1), (2). (In this condition, the monitor switches (1) & (2) contacts are opened.) When the oven is plugged in, and the rated voltage is supplied to the control unit through the noise filter, (figure O-1), the display will show " . ".

IDLE CONDITION

When the door is opened, the contacts of the door sensing switch open, initiating the following:

1. A signal is input to the control unit energizing the coil of shutoff relay (RY-1).

2. The shut-off relay (RY-1) contacts close completing circuits to turn on the oven lamp, blower motor and stirrer motors.

3. If the door remains open, 60 seconds later the control unit de-energizes shut-off relay (RY-1) turning off the oven lamp, blower motor and stirrer motors.

When the door is closed, the door sensing switch contacts close. With the closing of the door sensing switch contacts, an additional circuit is provided which will permit the operation of the oven when one of the touch pads is depressed. Since the control is enabled through the door sensing switch, the door must be closed before the touch pads will be effective. When the door is closed, a full 60 second IDLE condition is always provided for selecting and pressing the desired touch pads. A 60 second IDLE condition will also follow the end of each cook cycle.

COOKING CONDITION

When the door is closed from the open position and Memory pad is touched the, following will occur:

1. The contacts of relays are closed and components connected to the relays are turned on (For details, refer to Figure O-3)

2. Rated voltage is supplied to the primary winding of the power transformer and is converted to about 3.15 volts output on the filament winding, and approximately 2305 volts on the high voltage winding.

3. The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.

4. The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed-box, and then into the cavity where the food is placed to be cooked.

5. Upon completion of the cooking time, the oven will revert to the IDLE condition.

6. When the door is opened during a cook cycle, monitor switches (1) & (2), door sensing switch, secondary interlock switches (1), (2) and primary interlock relays (1), (2) are activated with the following results. The circuits to the high voltage components are de-energized, and the digital readout displays " . " and cooking is cancelled (in the case of Memory cooking).

7. The monitor switch (1) is electrically monitoring the operation of the secondary interlock switch (1) and primary interlock relay (1), and monitor switch (2) is electrically monitoring the operation of the secondary interlock switch (2) and primary interlock relay (2), and monitor switches (1), (2) are mechanically associated with the door so that it will function in the following sequence.

(1) When the door opens from a closed position, the contacts

of the primary interlock relays (1), (2) and secondary interlock switches (1), (2) open. Then the monitor switch contacts close.

(2) When the door is closed from the open position, the monitor

switches (1), (2) contacts first open, and then the contacts of the secondary interlock switches (1), (2) close.

If the secondary interlock switches (1), (2) and primary interlock relays (1), (2) fail with their contacts closed when the door is opened, the closing of the monitor switches (1), (2) contacts will form a short circuit through the monitor fuse, secondary interlock switches (1), (2) and primary interlock relays (1), (2), causing the monitor fuse to blow.

VARIABLE POWER COOKING

When Variable Cooking Power is programmed, the rated voltage A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2, RY-3). Relays RY-2 and RY-3 are operated by the control unit within an interval second time base. Microwave power operation is as follows:

POWER LEVEL ON TIME OFF TIME 100% 32 sec. 0 sec. 90% 30 sec. 2 sec. 80 % 26 sec. 6 sec. 70% 24 sec. 8 sec. 60% 22 sec. 10 sec. 50% 18 sec. 14 sec. 40% 16 sec. 16 sec. 30% 12 sec. 20 sec. 20% 8 sec. 24 sec. 10% 6 sec. 26 sec. 0% 0 sec. 32 sec.

Note: The ON/OFF time ratio does not exactly correspond

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

Page 9

R-25JT-F

TWO MAGNETRON OPERATION SYSTEM

Two magnetrons (1), (2) are equipped in order to get higher microwave power output. The primary windings of the power transformers (1), (2) are connected so that each magnetron can be oscillated alternatively according to the frequency of the power supply. Refer to the Figure B-1.

COMMERCIAL FREQUENCY (60HZ)

POWER OUTPUT BY MAGNETRON 1

POWER OUTPUT BY MAGNETRON 2

Figure B-1. Operation of Magnetron

OPERATION OF MAGNETRON

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED OR 1 MINUTE AFTER COOK OFF

2. " . " APPEARS ON DISPLAY

NOISE FILTER

BLKWHT

208/230V 60Hz

GRN

FUSE 20A

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR 1.0 F AC250V

DISCHARGE RESISTOR 470K 1/2W

OVEN TEMP. FUSE

TAB1

RY1

A1 A3 B2 B1

V.S.

SW (1)

COM

3300pF 3300pF

BLOWER MOTOR

STIRRER MOTOR

PRIMARY INTERLOCK RELAY (1)

PRIMARY INTERLOCK RELAY (2)

TAB2

DOOR SENSING SWITCH

OVEN LAMP

RY2

RY3

SECONDARY INTERLOCK SWITCHE(1)

SECONDARY INTERLOCK SWITCHE(2)

OVEN

THERMISTOR (2)

OVEN

THERMISTOR (1)

MAGNETRON

TEMP. FUSE (1)

MAGNETRON

TEMP. FUSE (2)

MONITOR SWITCH (2)

MONITOR SWITCH (1)

MAGNETRON THERMISTOR

V.S.SW (3)

COM

VOLTAGE SELECT

SWITCH (V.S.SW) (2)

COM

POWER TRANSFORMER (1)

CAPACITOR (1)

0.94µF

POWER TRANSFORMER (2)

CAPACITOR (2)

0.94µF

H.V. RECTIFIER (1)H.V. RECTIFIER (2)

MAGNETRON (1)

MAGNETRON (2)

Figure O-1. Oven Schematic-OFF Condition (208 V Condition)

Page 10

R-25JT-F

SCHEMATIC

NOTE: CONDITION OF OVEN

1. FOR 1MINUTE AFTER DOOR OPENED.

2. " . " APPEARS ON DISPLAY.

NOISE FILTER

BLKWHT

208/230V 60Hz

GRN

FUSE 20A

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR 1.0 F AC250V

DISCHARGE RESISTOR 470K 1/2W

OVEN TEMP.

FUSE

A1 A3 B2 B1

3300pF 3300pF

RY1

V.S.

SW (1)

COM

BLOWER MOTOR

TAB1

DOOR SENSING SWITCH

OVEN LAMP

STIRRER MOTOR

PRIMARY INTERLOCK RELAY (1)

PRIMARY INTERLOCK RELAY (2)

TAB2

RY2

RY3

SECONDARY INTERLOCK SWITCHE(1)

SECONDARY INTERLOCK SWITCHE(2)

OVEN

THERMISTOR (2)

OVEN

THERMISTOR (1)

MAGNETRON

TEMP. FUSE (1)

MAGNETRON

TEMP. FUSE (2)

MONITOR SWITCH (2)

MONITOR SWITCH (1)

MAGNETRON THERMISTOR

V.S.SW (3)

COM

VOLTAGE SELECT

SWITCH (V.S.SW) (2)

COM

POWER TRANSFORMER (1)

CAPACITOR (1)

0.94µF

POWER TRANSFORMER (2)

CAPACITOR (2)

0.94µF

H.V. RECTIFIER (1)H.V. RECTIFIER (2)

MAGNETRON (1)

MAGNETRON (2)

Figure O-2. Oven Schematic-IDLE Condition (208 V Condition)

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. SELECTATIME PAD TOUCHED.

3. COOKING TIME PROGRAMMED.

4. START PAD TOUCHED.

NOISE FILTER

FUSE 20A

BLKWHT

208/230V 60Hz

GRN

NOISE SUPPRESSION COIL

LINE CROSS CAPACITOR 1.0 F AC250V

DISCHARGE RESISTOR 470K 1/2W

3300pF 3300pF

PRIMARY INTERLOCK RELAY (1)

OVEN TEMP.

FUSE

RY1

A1 A3 B2 B1

V.S.

SW (1)

COM

BLOWER MOTOR

TAB1

DOOR SENSING SWITCH

OVEN LAMP

STIRRER MOTOR

PRIMARY INTERLOCK RELAY (2)

TAB2

RY2

RY3

SECONDARY INTERLOCK SWITCHE(1)

SECONDARY INTERLOCK SWITCHE(2)

OVEN

THERMISTOR (2)

OVEN

THERMISTOR (1)

MAGNETRON

TEMP. FUSE (1)

MAGNETRON

TEMP. FUSE (2)

MONITOR SWITCH (2)

MONITOR SWITCH (1)

MAGNETRON THERMISTOR

V.S.SW (3)

COM

VOLTAGE SELECT

SWITCH (V.S.SW) (2)

COM

POWER TRANSFORMER (1)

CAPACITOR (1)

0.94µF

POWER TRANSFORMER (2)

CAPACITOR (2)

0.94µF

H.V. RECTIFIER (1)H.V. RECTIFIER (2)

MAGNETRON (1)

MAGNETRON (2)

Figure O-3. Schematic-Cooking Condition (208 V Condition)

Page 11

DESCRIPTION AND FUNCTION OF COMPONENTS

R-25JT-F

DOOR OPEN MECHANISM

1. The door release lever is pulled.

2. The upper latch head is lifted up by the linked door release lever.

3. The latch lever is lifted up by the door release lever.

4. The joint lever is lifted up by the latch lever.

5. The lower latch head is lifted up by the joint lever.

6. Now both latch heads are lifted up, so they can be released from the latch hook.

7. Now the door can be opened.

Door release lever

Joint lever

Latch lever

Latch head

Switch lever A

Monitor switch (2)

Monitor switch (1)

Latch hook

Switch lever B

Secondary interlock switch (2)

Secondary interlock switch (1)

Door sensing switch

Switch lever C

Figure D-1. Door Open Mechanism

DOOR SENSING SWITCH

The door sensing switch is activated by the latch head of the door and switch lever C. When the door is opened, the contacts of the switch open and interrupt the circuit to the coils of the primary interlock relays (1), (2). The contacts of the primary relays (1), (2) then open and interrupt the circuit to the primary winding of the power transformers. At this time, the contacts of relay RY1 close and the blower motor, stirrer motors and oven lamps are energized for 1 minute.

SECONDARY INTERLOCK SWITCHES (1), (2)

The secondary interlock switches (1), (2) are activated by the upper latch head of the door and switch lever B. When the door is opened, the contacts of the switch open and interrupt the circuit to the primary winding of the power transformers (1), (2).

MONITOR SWITCHES (1), (2)

The monitor switches (1), (2) are mounted in the upper position of the latch hook. The monitor switches are activated by the upper latch head of the door and switch lever A. When the door is opened, the contacts of the monitor switches close. Monitor switch (1) is intended to render the oven inoperative by means of blowing the monitor fuse, when the contacts of the primary interlock relay (1) and secondary interlock switch (1) fail to open when the door is opened. Monitor switch (2) is intended to render the oven inoperative by means of blowing the monitor fuse, when the contacts of the primary interlock relay (2) and secondary interlock switch (2) fail to open when the door is opened.

Functions:

With the door shut, the contacts of the door sensing switch and the secondary interlock switches (1), (2) are closed and the contacts of the monitor switches (1), (2) are open.

1. When the door is opened, the contact of the door sensing switch and secondary interlock switches (1), (2) are opened first, then the contact of the monitor switches (1), (2) are closed.

2. As the door goes to a closed position, the contacts of the monitor switches (1), (2) are opened first, then the contacts of the door sensing switch and the secondary interlock switches (1), (2) close.

3. If the door is opened, and the contacts of the primary interlock relay and secondary interlock switch of the same circuit fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts of that circuit (1 or 2).

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAYS (1), (2), SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR SWITCHES (1), (2) FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND SWITCH ARE REPLACED

AS AN ASSEMBLY.

MAGNETRON TEMPERATURE FUSES (1), (2)

The temperature fuses (1), (2) located on the top of the upper and lower waveguide, are designed to prevent damage to the magnetrons (1), (2). If an over heated condition develops in the tube due to blower motor failure, obstructed air ducts, dirty or blocked air intake, etc., the circuit to the magnetrons are interrupted. Under normal operation, the temperature fuses remains closed. However, when abnormally high temperatures are generated within the magnetron, the temperature fuse will open at 302˚F (150˚C) causing the microwave energy to stop. The defective temperature fuse must be replaced with new rated one.

OVEN TEMPERATURE FUSE

The temperature fuse, located on the side of the exhaust duct assembly, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the temperature fuse will open. Under normal operation, the oven temperature fuse remains closed. However, when abnormally high temperatures are generated within the oven cavity, the oven temperature fuse will open at 248˚F (120˚C), causing the oven to shut down. The defective temperature fuse must be replaced with new rated one.

OVEN THERMISTOR (1)

The thermistor is a negative temperature coefficient type. The temperature in the exhaust duct is detected through the resistance of the thermistor. If the temperature is high, the control panel will display “EE7” and the oven will stop to avoid overheating and catching fire. If the thermistor is open, the control panel will display "EE6" and the oven will stop.

Page 12

R-25JT-F

OVEN THERMISTOR (2)

This thermistor detects temperature of the oven cavity bottom plate. The thermistor is a negative temperature coefficient type. The temperature is detected through the resistance of the thermistor. If the temperature is high, the control will display “EE17” and the oven will stop.

MAGNETRON THERMISTOR

The thermistor is a negative temperature coefficient type. The air temperature around the upper magnetron is detected through the resistance of the thermistor. If the temperature is high, the control panel will display "EE17" and the oven will stop to protect the lower magnetron against overheat. If the oven thermistor (2) and the magnetron thermistor are open at the same time, the control panel will display "EE16" and the oven will stop.

BLOWER MOTOR

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

SELECT SWITCH AND ELECTRICAL COMPONENTS CONDITION

SWITCH NO. ELECTRICAL PARTS

(1) Touch control unit (2) Power transformer (1) (Front side) (3) Power transformer (2) (Rear side)

Oven in the 208V setting: contacts between common and normally open are closed.

Oven in the 230V setting: contacts between common and normally closed are closed.

NOISE FILTER

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

STIRRER MOTORS

The upper and lower stirrer motors drive stirrer antennas to stir the microwave radiation from the upper and lower waveguides.

OVEN LAMPS

The oven cavity light illuminates the interior of the oven so that food being cooked can be examined visually through the door window without having to open the door. The oven lamp is on during the cooking cycle and idle condition.

SELECT SWITCHES (1) - (3)

The select switch assembly is an array of three separate switches which may be configured for either 208V or 230V operation (see General Information section, voltage select). These switches are connected to the windings of components specified in the table below and make those components compatible with the specified line voltage by changing their internal windings. For 208V operation contacts (Normal Open) of the all switches are open.

Select switch (3)

Select switch (1)

N.O

Oven cavity

COM.

Select switch (2)

Screw

Switch spacer

Select switch angle

Rear cabinet side

N.C.

Page 13

R-25JT-F

TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

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.

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switches (1), (2), primary

interlock relays RY2, RY3, door sensing switch and secondary interlock switches (1), (2), before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch (1) and/or (2) must also be replaced. Use part FFSBA033WRKZ as an assembly.

IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may, in some cases, be

necessary to connect the power supply cord after the outer case has been removed, in this event,

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect the leads to the primaries of the two power transformers.

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

6. After that procedure, 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 two high voltage capacitors.

4. Reconnect the all leads removed from components during testing.

5. Reinstall the outer case (cabinet).

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

7. Run the oven and check all functions.

Page 14

R-25JT-F

HIGH POWER SUPPLY VOLTAGE

CKCK

RST RST RST

NO LOAD OPERATION

EXCEED MAX. HEATING TIME

LOW POWER SUPPLY VOLTAGE

NO POWER AT OUTLET

SHORT IN POWER SUPPLY CORD

LOOSE WIRING

AIR FLOW BLOCKED

SITTER MOTORS

OPEN FOIL PATERN ON P.W.B.

RELAY (RY-3)

RELAY (RY-2)

RELAY (RY-1)

KEY UNIT

CK = Check / RST = Reset / RE = Replace

TOUCH CONTROL PANEL

NOISE FILTER MAGNETRON THERMISTOR

OVEN THERMISTOR (2)

OVEN THERMISTOR (1)

SELECT SWITCH (3)

SELECT SWITCH (2)

SELECT SWITCH (1)

BLOWER MOTOR

OVEN LAMP OR SOCKET

OVEN TEMPERATURE FUSE

MAGNETRON TEMP. FUSE (1), (2)

MONITOR FUSE

MONITOR SWITCH (1), (2)

DOOR SENSING SWITCH

PRIMARY INTERLOCK SYSTEM (1), (2)

SECONDARY INTERLOCK SWITCH (1), (2)

HIGH VOLTAGE CAPACITOR (1), (2)

H.V. RECTIFIER (1), (2)

POWER TRANSFORMER (1), (2)

ABCDEF FG I J JCK HHHKK LKMNOOOPCKCKCKCKCK

MAGNETRON (1), (2)

(1)

(2)

TEST PROCEDURE

DEFECTIVE PARTS

POSSIBLE CAUSE AND

PROBLEM

Home fuse blows when power cord is plugged into wall

receptacle

Monitor fuse blows when power cord is plugged into wall

receptacle.

" . " does not appear in display when power cord is first

plugged into wall receptacle.

Blower motor does not operate. (Oven lamp(s) and stirrer

motors go on for 1 minute after door is opened.)

Blower motor, oven lamp(s) and stirrer motors do not go on for

1 minute after door is opened.

Blower motor and stirrer motors go on but oven lamp(s) do not

light for 1 minute after door is opened.

Blower motor, oven lamp(s) and stirrer motors keep going on

after more than 1 minute when door is opened and closed.

Blower motor, oven lamp(s) and stirrer motors do not go on in

cook cycle.

Oven goes into a cook cycle but shuts down before and off

cooking cycle.

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

Low or no power is produced during cooking condition. (The

OFF

CONDITION

COOKING

CONDITION

food is heated incompletely or not heated at all.)

Extremely uneven heating is produced in oven load (food).

Variable cooking does not operates properly, except HIGH

power functions.

"EE1" Magnetron (1) failure.

"EE2" Magnetron (2) failure.

"EE3" Magnetron (1) and (2) failure.

"EE4" Voltage is too high.

"EE5" Voltage is too low.

"EE6" Oven thermistor (1) failure.

"EE7" Exhaust air temperature is too high.

"EE8" Relay melt short.

"EE9" Maximum time is exceeded.

"EE16" Oven thermistor (2) and Magnetron thermistor are

open.

"EE17" Magnetron temperature is too high.

ERROR

MODE

Page 15

TEST PROCEDURES

R-25JT-F

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

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 ohm.

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 and must be replaced.

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet).

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

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 assembled 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: silicon rectifier, high voltage capacitor and power transformer. This test will require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure must be followed carefully:

COMPONENT TEST

1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the water until the temperature stabilizes. Record the temperature of the water.

2. Place the cup of water in the oven. Operate oven at 100% POWER selecting more than 60 seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch or the digital read-out countdown.

3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded.

4. Subtract the cold water temperature from the hot water temperature. The normal result should be 55.4 to 103˚F(30.8 to 57.2˚C) rise in temperature. If the water temperatures are accurately measured and 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 cooking time. Because cooking 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 208/230 volts and the oven cavity is clean.

B POWER TRANSFORMER TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 57 ohms; the resistance of the filament coil should be less than 1 ohm.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

Page 16

R-25JT-F

TEST PROCEDURES

PROCEDURE

LETTER

(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

C HIGH VOLTAGE RECTIFIER (1) AND/ OR (2) TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

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. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

D HIGH VOLTAGE CAPACITOR (1) AND/ OR (2) TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for a short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case. If it is shorted, replace the capacitor.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

E SECONDARY INTERLOCK SWITCH (1) AND/ OR (2) TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Isolate the switch and connect the ohmmeter to 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 secondary interlock switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

F PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

Page 17

TEST PROCEDURES

R-25JT-F

PROCEDURE

LETTER

8. Run the oven and check all functions.

NOTE:If the door sensing switch contacts fail in the open position and the door is closed, the blower

motor, stirrer motors and oven light will be activated by RY1.

PRIMARY INTERLOCK RELAY (RY2, RY3)

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay RY2 and/or RY3. Check the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

G MONITOR SWITCH (1) AND/ OR (2) TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Before performing this test, make sure that the secondary interlock switches (1), (2) and the primary interlock relays RY2, RY3 are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switches (1), (2) (COM) terminals. Check the monitor switches (1), (2) operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the upper latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switches, reconnect the wire lead to the monitor switch (COM) terminals and check the continuity of the monitor circuit.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

SCREW DRIVER

LATCH HOOK

MONITOR SWITCH (2)

MONITOR SWITCH (1)

OHMMETER

H VOLTAGE SELECT SWITCHES TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

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

Plunger operation Between COM. and NO. Between COM. and NC. COM.: Common terminal

Plunger released Open circuit Close circuit NO.: Normal Open terminal

Plunger operation Close circuit Open circuit NC.: Normal Close terminal

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

Table: Switch Connection

Rear cabinet side

N.C.

Select switch (1)

Oven cavity

COM.

Select switch (2)

N.O

Select switch (3)

Select switch angle

Screw

Switch spacer

Page 18

R-25JT-F

TEST PROCEDURES

PROCEDURE

LETTER

I BLOWN MONITOR FUSE TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. If the monitor fuse is blown when the door is opened, check the primary interlock relays RY2, RY3, secondary interlock switches (1), (2) and monitor switches (1), (2) according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK

RELAYS, SECONDARY INTERLOCK SWITCHES, DOOR SENSING SWITCH AND MONITOR

SWITCHES FOR PROPER OPERATION. If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA033WRKZ, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

J TEMPERATURE FUSE TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches specfied temperature as shown below.

COMPONENT TEST

Magnetron temperature fuse (1)

Magnetron temperature fuse (2)

Oven temperature fuse

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,

REPLACE TEMPERATURE FUSE.

K THERMISTOR TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. Follow the procedures below for each thermistor.

4-1. MAGNETRON THERMISTOR TEST Disconnect connector-H from the CPU unit. And disconnect the connector of the magnetron thermistor from the switch harness. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Open Close Display or temperature temperature Condition Check point

Magnetron (1) Failure: Test magnetron (1) and Blower fan motor.

Magnetron (1), (2) Failure: Test magnetron (1), (2). Check blower fan motor and ventilation opening.

Magnetron (2) Failure: Test magnetron (2) and Blower fan motor.

Food has been burned in oven. Temperature of oven inside is very high.

150˚C

120˚C

Non resetable type

EE1

EE3

EE2

Oven shut off

Page 19

TEST PROCEDURES

R-25JT-F

PROCEDURE

LETTER

COMPONENT TEST

Room Temp. 59˚F (15˚C) 68˚F (20˚C) 77˚F (25˚C)

Resistance Approx. 373 kΩ Approx. 292 kΩ Approx. 231 kΩ

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

4-2. OVEN THERMISTOR (1) TEST Disconnect connector-B from the CPU unit. Measure the resistance of the thermistor with an ohmmeter.

Connect the ohmmeter leads to the leads of the thermistor.

Room Temp. 59˚F (15˚C) 68˚F (20˚C) 77˚F (25˚C)

Resistance Approx. 373 kΩ Approx. 292 kΩ Approx. 231 kΩ

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

4-3. OVEN THERMISTOR (2) TEST Disconnect connector-H from the CPU unit. And disconnect the connector of the magnetron thermistor from

the switch harness. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Room Temp. 59˚F (15˚C) 68˚F (20˚C) 77˚F (25˚C)

Resistance Approx. 16 kΩ Approx. 13 kΩ Approx. 11 kΩ

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

L NOISE FILTER TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the lead wires from the terminal the noise filter. Using an ohmmeter, check between the terminals as described in the following table. If incorrect reading are obtained, replace the noise filter.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

MEASURING POINT INDICATION OF OHMMETER

Between N and L Approx. 470 KΩ

Between terminal N and WHITE/ BLACK Short circuit.

Between terminal L and RED Short circuit.

M TOUCH CONTROL PANEL ASSEMBLY TEST

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

LINE CROSS CAPACITOR

NOISE SUPPRESSION COIL

LINE BYPASS

CAPACITOR

0.0033µF / AC 125V

BLACK

NOISE FILTER

DISCHARGE RESISTOR

470 K 1/2W

1.0µF / AC 250V

LINE BYPASS

CAPACITOR

0.0033µF / AC 125V

FUSE 20A

REDWHITE

Page 20

R-25JT-F

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

Before testing,

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

2) Open the door and block it open.

3) Discharge two high voltage capacitors.

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 insulation tape.

1. Key Unit. NOTE ;

1) Check Key unit ribbon connection before replacement.

2) Reconnect all leads removed from components during testing.

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

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

5) 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 outer case.

2) Open the door and block it open.

3) Discharge two high voltage capacitors.

4) Replace the Key unit.

5) Reconnect all leads removed from components during testing.

6) Re-install the outer case (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 N) to determine if control unit is faulty. Re-connect the power supply cord. And check for followings.

2-1 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 display

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 problems caused by defective control unit.

a) Buzzer does not sound or continues to sound. b) Cooking is not possible.

When testing is completed,

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

2) Open the door and block it open.

3) Discharge two high voltage capacitors.

4) Reconnect all leads removed from components during testing.

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.

Page 21

TEST PROCEDURES

R-25JT-F

PROCEDURE

LETTER

N KEY UNIT TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

COMPONENT TEST

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 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 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 a beep 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.

G 9

G 10

G 11

G 12

G 1

G 2

G 3

DOUBLE

QUANTITY

EXPRESS DEFROST

SELECTA

POWER

SELECTA

TIME

G 7G 6G 5G 4

START SET

STOP / CLEAR

11131519

12141620

G 8

CHECK

SIGNAL

O RELAY TEST

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

2. Open the door and block it open.

3. Discharge two high voltage capacitors.

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 insulation tape.

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

7. Remove the outer case and check voltage between Pins No. 5 (or No. 3 at 230V) and No. 7 of the 7 pin connector (A) on the control unit with an A.C. voltmeter. The meter should indicate rated voltage, if not check oven circuit.

RY1, RY2 and RY3 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

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 12.0V D.C. Oven lamp / Blower motor / Stirrer motors

RY2 Approx. 12.0V D.C. Power transformer 1 RY3 Approx. 12.0V D.C. Power transformer 2

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

9. Open the door and block it open.

10. Discharge two high voltage capacitors.

11. Reconnect all leads removed from components during testing.

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

good, control unit is defective.

Page 22

R-25JT-F

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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

14. Run the oven and check all function.

P 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, this foil pattern acts as a fuse.

1. Foil pattern check and repairs.

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

2) Open the door and block it open.

3) Discharge two high voltage capacitors.

4) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.

2Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 865Ω ± 10% between 208V terminals and 970Ω ± 10% between 230V terminals). If any abnormal condition is detected, replace the defective parts.

TB1

(J1)

(VRS2)

POWER

CT1

POWER

VRS1

6) Reconnect all leads removed from components during testing.

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

8) Reconnect the power supply cord after the outer case is installed.

9) Run the oven and check all functions.

2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are finished.

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

2) Open the door and block it open.

3) Discharge two high voltage capacitors.

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 insulation

tape.

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

7) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 The rated AC voltage is not present to power Check supply voltage and oven power cord.

terminal of CPU connector CN-A.

2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and repair.

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

9) Open the door and block it open.

10) Discharge two high voltage capacitors.

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 is installed.

14) Run the oven and check all functions.

Page 23

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-25JT-F

The touch control section consists of the following units as shown in the touch control panel circuit.

(1) Control Unit (2) Key Unit

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

1. Control Unit

Signal of key touch and oven function control are all processed by one microcomputer.

1) Power Supply Circuit

This circuit changes output voltage at the secondary side of the low voltage (T1) transformer to voltages required at each part by full wave rectifying circuit, constant voltage circuit, etc..

2) ACL Circuit

This is an Auto-clear Circuit, i.e., a reset circuit, which enables IC1 to be activated from initial state.

3) Power Synchronizing Signal Generating Circuit

This is a circuit for generating power synchronizing signal by virtue of the secondary side output of transformer T1. This signal is used as a basic frequency for time processing.

4) Clock Circuit

This is a circuit for controlling clock frequency required for operating IC1.

5) IC1 (Main Processor)

This is a one-chip microcomputer, responsible for controlling the entire control unit.

6) IC2 (Memory Processor)

This is a memory IC, responsible for memory function.

7) IC3

This is a IC for driving light emitting diode.

8) Display Circuit

This is a circuit for driving light emitting diode by IC1 output.

9) Key Input Circuit

This is a circuit for transmitting key input information to IC1.

10) Sound-body Driving Circuit

This is a circuit for driving sound body by IC1 output.

11) Relay Driving Circuit

This is a circuit for driving output relay by IC1 output.

12) Door Sensing Switch Circuit

This is a circuit for driving IC1 to detect door opening/ closing.

13) Exhaust Air Temperature Detecting Circuit

This is a circuit for transmitting output change of thermistor (Oven thermistor (1)) to IC1.

14) Magnetron Temperature Circuit (Detect no load or fan lock)

This is a circuit for transmitting output change of thermistor (Magnetron thermistor) to IC1.

15) Oven Cavity Temperature Detecting Circuit

This is a circuit for transmitting output change of thermistor (Oven thermistor (2)) to IC1.

16) High Voltage Monitoring Circuit.

This circuit detects problems in the magnetron / high voltage circuit by sensing a variation in the current flowing through the primary winding of the high voltage transformer. During heating, the primary current of the high voltage transformers also flows through the primary winding of the current transformer CT1. This causes a current to be induced in the secondary winding of CT1 and results in an AC voltage which is determined by R100. This AC voltage is then half wave rectified by D100 and smoothed (filtered) by C100. This AC voltage is the input to the AN3 port of IC1, which determines if there is a magnetron / high voltage problem.

TB1

TB2

CT1

D100 R102

C100

R100

820F

47µ/10v

R101

4.7k

100k

C101

To AN3 of IC1

0.01µ/16v

Figure T-1. High Voltage Monitoring Circuit

17) Supply Voltage Detecting Circuit

This is a circuit for detecting troubles of input voltage at microwave oven. The function of this circuit is to divide the variation of voltage across C1 to supply voltage variation by ZD1, R1 and R2 and to put the result to AN6 port of IC1 for detection.

10EDB10 x 4

VRS1

D2 D4

C1 2200µ/25v

ZD1

IC1(AN6)

AC230V

60Hz

AC208V

60Hz

A 3

A 5

VRS2

(J1)

A 7

FIgure T-2. Supply Voltage Detecting Circuit

HZ12B1

470

Page 24

R-25JT-F

VOLTAGE REGULATION FOR "ERROR" INDICATION

Voltage Input to Input to

regulation 208V 230V

*Normal +6% excel. 208.0--220.48 230.0--243.8

*Normal -9% excel. 189.28--208.0 209.3--230.0

*Error.or +6% to 220.48 243.8 indication +13% excel. 235.04 259.9 range -9% to 189.28 209.3

-13% excel. 180.96 200.1

Not over +13% over 235.04 over 259.9 cookable under -13% under 180.96 under 200.1

* Cookable Range

2. Key Unit

The key unit is composed of a matrix circuit in which when a key it touched, one of signals P30--P34 generated by the LSI, is passed through the key and returned to the LSI as one of signals P24--P27. This model has 20 Memory pads. When the oven is shipped, Memory pad 1 to 10 are set as follows: fig.1.

Memory No. Cook Time Output Power

1 10 sec. 100% 2 20 sec. 100% 3 30 sec. 100% 4 45 sec. 100% 51 min. 100% 61 min. 15 sec. 100% 71 min. 30 sec. 100% 82 min. 100% 92 min. 30 sec. 100% 03 min. 100%

(fig. 1)

This model has a double quantity pad. When the oven is shipped, Magnification "1.8" is preset in the double quantity pad. This model has an express defrost pad. When the oven is shipped, express defrost is set as follows: fig.2.

1 STAGE 2 STAGE 3 STAGE

FORMULA P = 0.2T + 20 P = 0.13T + 30 P = 0.67T - 50

POWER 40 % 30 % 20 %

T : Total cooling time

(fig. 2)

When 1/2 total cooking time is passed, the signal will

sound and "CHECK" indicator will flash.

Page 25

DESCRIPTION OF LSI

LSI(IZA633DR)

The I/O signal of the LSI(IZA633DR) is detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Power source voltage: +5V.

VC voltage of power source circuit input.

2/3

VEE/AVSS IN Connected to GND

4 VREF IN Connected to VC. (+5V)

5 AN7 IN

Temperature measurement input: INTAKE THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.

6 AN6 IN Used (judge for input voltage).

7-8 AN5-AN4 IN

Terminal to change functions according to the model.

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

9 AN3 IN A/D input for troubleshooting Magnetron 1. and/or Magnetron 2.

10 AN2 IN

Temperature measurement input: OVEN THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.

11 AN1 IN

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

Door closed; "L" level signal (0V). Door opened; "H" level signal (+5V).

12 AN0 IN

Temperature measurement input: FAN LOCK THERMISTOR.

By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.

13-14 P55-P54 OUT

Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay. In 100% power level operation, "H" level during cooking; "L" level otherwise. In other power level operation (90,80,70,60,50,40,30,20,10 or 0%), "H" and "L" level is repeated according to power level.

Power level ON OFF Power level ON OFF

100% 32sec. 0sec. 40% 16sec. 16sec. 90% 30sec. 2sec. 30% 12sec. 20sec. 80% 26sec. 6sec. 20% 8sec. 24sec. 70% 24sec. 8sec. 10% 6sec. 26sec. 60% 22sec. 10sec. 0% 0sec. 32sec. 50% 18sec. 14sec.

32 sec.

OFF

R-25JT-F

+5V

GND

15 P53 OUT Oven thermistor circuit power supply control signal.

Output the "H" signal to supply power to oven thermistor circuit about 1.7msec. after plugging in.

16-18 P52-P50 IN Terminal not used.

19 P47 OUT

20 P46 OUT

Signal to sound buzzer.

This signal is to control the 2.5kHz continuous signal through IC3. A: key touch sound. B: Guydance sound. C: Completion sound.

Oven lamp, Blower motor and Stirrer motor driving signal. (Square Waveform : 60Hz)

0.1 sec

1 sec

2 sec

To turn on and off the shut-off relay (RY1). The Square waveform voltage is delivered to the RY1 driving circuit and relays(RY2,RY3,COOK RELAY) control circuit.

1 sec

+5V

GND

16.7 msec

+5V

GND

+5V

GND

During cooking

200µsec.

Page 26

R-25JT-F

Pin No. Signal I/O Description

21 P45 OUT Digit selection signal.

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

P42 ..................... 1st.

P43 .................... 2nd.

P44 ..................... 3rd.

P45 ..................... 4th.

Normally, one pulse is output in every ß period, and input to the grid of the light-emitting diode.

22-24 P44-P42 OUT

Digit selection signal.

Signal similar to P45.

25 INT1 IN

Signal synchronized with commercial power source frequency.

This is basic timing for all time processing of LSI.

26 INT0 IN Connected to GND through resistor.

27 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.

28 P71 OUT Memory (EEPROM) clock output.

29 P70 IN/OUT Memory (EEPROM) data input/output.

30 XIN IN

Internal clock oscillation frequency setting input.

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

31 XOUT OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

32 VSS IN Connected to GND.

33 P27 IN

Signal coming from touch key.

When either one of G-12 line keys on key matrix is touched, a corresponding signal out of P30, P31, P32, P33, P34 will be input into P27. When no key is touched, the signal is held at "L" level.

34 P26 IN

Signal similar to P27.

When either one of G-11 line keys on key matrix is touched, a corresponding signal will be input into P26.

35 P25 IN

Signal similar to P27.

When either one of G-10 line keys on key matrix is touched, a corresponding signal will be input into P25.

36 P24 IN

Signal similar to P27.

When either one of G-9 line keys on key matrix is touched, a corresponding signal will be input into P24.

37-38 P23-P22 OUT Terminal not used.

39-40 P21-P20 OUT

Segment data signals.

The relation between signals and indicators are as follows: Signal Segment Signal Segment

P21,P20 .......... 1 P05,P04 .............7

P17.P16 .......... 2 P03,P02 .............8

P15,P14 .......... 3 P01,P00 .............9

P13,P12 .......... 4

P11,P10 .......... 5

P07,P06 .......... 6

ß(60Hz)

P42

P43

P44

P45

ß(60Hz)

16.7 msec

+5V

GND

H : +5V

L : GN

+5V

GND

Page 27

Pin No. Signal I/O Description

FUNCTIONAL DIAGRAM

E PROM

256 x 8

START

STOP

LOGIC

CONTROL

LOGIC

SLAVE ADDRESS

COMPARATOR

H.V. GENERATION

TIMING

& CONTROL

YDEC

DATA REGISTER

Dout

XDEC

START CYCLE

INC

LOAD

WORD ADDRESS COUNTER

R/W

Dout ACK

(6) SCL

(5) SDA

(4) Vss

(3) Vcc

R-25JT-F

41-48 P17-P10 OUT

Segment data signal.

Signal similar to P21.

49-56 P07-P00 OUT

Segment data signal.

Signal similar to P21.

57-59 P37-P35 OUT Terminal not used.

60 P34 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G4 line keys on key matrix is touched.

61 P33 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G5 line keys on key matrix is touched.

62 P32 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G6 line keys on key matrix is touched.

63 P31 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G7 line keys on key matrix is touched.

64 P30 OUT

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27, P26, P25 and P24 terminals while one of G8 line keys on key matrix is touched.

X24C02P is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 256 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2 are as shown in the following diagram.

2-2 Memory IC (IC2)

TOP VIEW

VSS

Pin No. Signal I/O Description

1-3 A0-A2 IN Connected to +5V. 4 VSS IN Connected to GND. 5 SDA IN/OUT Serial data input/output : input/outputs data to IC1. 6 SCL IN 7 TEST IN Connected to GND. 8 VCC IN Connected to +5V.

VCC

TES

SCL

SDA

Figure T-3 Relation between Pin Nos, and Signals

Clock signal input : input/outputs sireal data at every one pulse.

Page 28

R-25JT-F

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 aluminium 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.

approx. 1M ohm

2. Shapes of Electronic Components

Transistor DTA123ES DTB143ES

DTD143ES KRA101M KRC101M

KIA7805PI

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, before checking the performance of the touch control panel,

1) Disconnect the power supply cord, and then remove

outer case.

2) Open the door and block it open.

3) Discharge 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 insulation tape.

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

After checking the performance of the touch control panel,

1) Disconnect the power supply cord.

2) Open the door and block it open.

3) Re-connect the leads to the primary of the power

transformer.

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

5) Re-connect the power supply cord after the outer case is installed.

6) Run the oven and check all functions.

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, 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 activates 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 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).

4. Servicing 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: Single beam, frequency range: DC-10MHz type or more advanced model.

3) Others: Hand tools

5. Other Precautions

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

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

3) After aluminium 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.

Page 29

R-25JT-F

PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN

The following procedure enables the servicer to obtain the total using times (cook cycles) since the microwave oven is purchased and the total operation time (hours) since the microwave oven is purchased. The maximum capacity of the total using is 999,999 times, and the maximum capacity of total operation time is 999,999 hours.

1) Practice for checking total using times (Ex. 345678 times).

... Flashing / ... 0.1sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) .

CHECK . CHECK No.

CHECK 82 68 CHECK

(user total count)

SIGNAL SIGNAL

DOUBLE 34 56

QUANTITY (service total count upper figure)

3456XX

1 (No 1) 1 No.

(after 1 sec.) 34 56

(service total count upper figure)

2 (No 2) 2 No.

3) Practice for inputting total using times (Ex. 310000 times).

... Flashing / ... 0.1sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) .

CHECK . CHECK No. CHECK 82 68 CHECK

(user total count)

SIGNAL SIGNAL DOUBLE 34 56 QUANTITY (service total count upper figure)

3456XX

22No.

(after 1 sec.) 78

(service total count lower figure)

XXXX78

11No.

(after 1 sec.) 34 56

SET 0

3,1,0,0 31 00 x 4

SET 31 00

22No.

(after 1 sec.) 78

SET 0 00 SET 0

(service total count 310000 set)

CHECK .

(after 1 sec.) 78

(service total count lower figure)

CHECK .

2) Practice for checking total operation time (Ex. 4567 hours).

... Flashing / ... 0.1sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) .

CHECK . CHECK No. CHECK 82 68 CHECK

(user total count)

SIGNAL SIGNAL DOUBLE 34 56

QUANTITY (service total count upper figure)

3456XX

9 (No 9) 9 No.

(after 1 sec.) 45

(Total operation time upper figure)

0 (No 0) 0 No.

(after 1 sec.) 67

(Total operation time lower figure)

CHECK .

4) Practice for inputting total operation time (Ex. 1234 hours).

... Flashing / ... 0.1sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) .

. CHECK . CHECK No. CHECK 82 68 CHECK

(user total count)

SIGNAL SIGNAL DOUBLE 34 56 QUANTITY (service total count upper figure)

3456XX

99No.

(after 1 sec.) 45

SET 0 1,2 12 x 2 SET 12

010No.

(after 1 sec.) 67

SET 0 3,4 34 x 2 SET 34

(Total operation time 1234 hours set)

CHECK .

Page 30

R-25JT-F

5) Practice for cancelling total using times and total operation time (user and service) and all other counter.

... Flashing / ... 0.1sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) . SET . SET . No. (within 2.0sec.) .

DOUBLE QUANTITY . DOUBLE CHECK . SINGLE . SET .

OTHER SETTING AND CHECKING PROCEDURE

1. EXPRESS DEFROST

T = STG1 + STG 2 + STG3 STG = A x T + B

1) To set the constants of Express defrost.

Ex. 0.20T + 20, 40% at 1st stage

0.13T + 30, 30% at 2nd stage

(

0.67T - 50, 20% at 3rd stage

)

" ": Flicker / : 0.1 sec BUZZER

PAD ORDER DISPLAY TONE

(Door close) .

SET .

SET "NO" .

(within 2 sec.) #1 START .

EXPRESS DEF 0.00 DEF.

2,0 0.20 DEF x 2

(A)

#2 SELECTATIME 0 DEF

2 20 DEF

(+ - B)

DEF

#4 SELECTAPOWER P -

DEF

4P - 40

SELECTATIME 0.00 DEF

1,3 0.13 DEF x 2

(A)

SELECTATIME 0 DEF

3 30 DEF

(+ - B)

DEF

#4 SELECTAPOWER P -

DEF

3 P - 30 SELECTATIME 0 DEF

#3 5 5 DEF

DEF

SELECTAPOWER P -

DEF

2P - 20 SET . DEF

SET .

#1 : No key entry signal. #2 : To set -B, touch the selectapower key twice. #3 : Ex. defrost is paused after 50% of cooking time has lapsed when 5

key is entered, otherwise it is paused at the end of each stage.

KEY DISPLAY PAUSE

00End of each stage

11After 10% of total cooking time is passed

:::

99After 90% of total cooking time is passed

START A There is no pause

2) To check the constants of Express defrost.

" ": Flicker / : 0.1 sec BUZZER

PAD DISPLAY INDICATOR TONE

CHECK . "No." CHECK EXPRESS DEFROST 0.20 DEF

CHECK .

( A )

( +-B )

P - 40

( PL )

0.13

( A )

( +-B )

P - 30

( PL )

( pause time )

P - 20

( PL )

( repeat )

3) To set user counts Practice for inputting total number of using times (Ex. 3100 times), and using times of Memory 1 (Ex. 100 times).

" ": Flicker / : 0.1 sec BUZZER

PAD DISPLAY INDICATOR TONE

(Door close) .

CHECK . CHECK No. CHECK 82 68 CHECK

DOUBLE QUANTITY

SIGNAL SET 0 3,1,0,0 31 00 x 4 SET 31 00

#A 1 1 No.

(after 1 sec.) 1 32

SET 0 1,0,0 1 00 x 3 SET 1 00

CHECK .

NOTE: 1 : To input using times of other memory, touch necessary Memory key

at above step #A.

2 : To input using times of manual cooking, touch SELECTATIME key

at above step #A.

3 : To input using times of Express Defrost, touch EXPRESS

DEFROST key at above step #A.

(user total count 3100 set)

(memory 1 count 100 set)

(user total count)

(memory 1 count)

Page 31

MEMORY READJUSTMENT PROCEDURE

1. To set the standard voltage

When the IC2 is changed in the control unit, the standard voltage must be set again for power supply check. The power supply must be set 230V within ± 1V, and 230V connector in control unit installed.

PAD ORDER DISPLAY TONE (230V power)

(Door close) (BLANK)

(Plug in) . SIGNAL .

DOUBLE .

SET .

All

CHECK 0633 indicators

(plug off) (BLANK)

NOTE :

1. This procedure must be performed within 1 minute.

2. When IC2 malfunctions the unit does not function normally (correct cooking data is not output, data is not stored correctly in memory, etc.).

3. Initialization of memory after repairing the touch control panel.

R-25JT-F

After repairing the touch control panel, reset all counters to 0 (including service counter). Make sure that the constant which is stated on page 22 (fig.2) has been memorized. If it mismatches, input the constant according to "EXPRESS DEFROST" on page 28.

A CHECK PROCEDURE FOR ERROR CODE INDICATION EE1, EE2

When the error code EE1 or EE2 is displayed, carry out following procedures and find out the defective parts. When oscillation is unstable due to defect of upper and/or lower magnetron or defective driving circuits, error code indications EE1 or EE2 do not function properly.

[CHECK METHOD FOR ERROR CODE INDICATION]

Put water in a cup and place inside the oven inside, and operate each circuit separately. And check working of each circuit by temperature rise of the water and judge which magnetron circuit is defect. After judging, please replace or repair applicable part according to the troubleshooting guide in the service manual.

[CAUTION ABOUT HIGH VOLTAGE]

There is high voltage present inside, disconnect the power supply cord from the outlet before removing the outer case. Reinstall the outer case when operate the unit.

[JUDGMENT PROCEDURE]

1]. PREPARATION FOR JUDGMENT

1. Disconnect the plug from the outlet.

2. Remove the air filter and unscrew two screws at the control panel lower holding the control panel.

3. Push up the control panel and pull it toward.

Page 32

R-25JT-F

2]. [JUDGMENT PROCEDURE FOR UPPER MAGNETRON AND ITS CIRCUIT]

Disconnect the power supply cord.

Disconnect lead wires to the interlock relay RY3 to avoid operation of lower magnetron circuit.

Reconnect power supply

Heating for one minute.

Temperature of the water increased?

If EE1 is indicated, carry out Test procedures A-J and find out the defective part. Upper magnetron, its driving circuit or any parts on its circuit may be defective.

Yes

EE2 should be indicated. Upper magnetron, its driving circuit and parts on the circuit are normal.

*1: CHECK OF TEMPERATURE RISE

Fill approx. 453 CC of water in a measuring cup and place it in the oven. Operate the oven for one minute. Substract cold water temperature from hot water temperature. The result should be approx. 18 - 36F (10 - 20 deg. C).

[JUDGMENT PROCEDURE FOR LOWER MAGNETRON AND ITS CIRCUIT]

3].

Disconnect the power supply cord.

Disconnect lead wires to the interlock relay RY2 to avoid operation of lower magnetron circuit. Lead wires to the interlock relay RY3 should be connected.

Reconnect power supply

Heating for one minute.

Temperature of the water increased?

If EE2 is indicated, carry out Test procedures A-J and find out the defective part. Lower magnetron, its driving circuit or any parts on its circuit may be defective.

Yes

EE1 should be indicated. Lower magnetron, its driving circuit and parts on the circuit are normal.

*1: CHECK OF TEMPERATURE RISE

Page 33

R-25JT-F

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING AGAINST HIGH VOLTAGE:

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with 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..

WARNING:

1. Disconnect the power supply cord.

2. Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then pull the door release lever with the other, this causes the latch leads 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.).

Carry out any remedial work that is necessary before operating the oven. Do not operate the oven if any of the following conditions exist;

1. Door does not close firmly.

Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.

WARNING FOR WIRING

To prevent an 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 two high voltage capacitors and wait for 60 seconds.

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

1) High voltage parts: Magnetron, High voltage transformer, High voltage capacitor, High voltage rectifier assembly and High voltage wire.

2) Hot parts: Oven lamp, Magnetron, High voltage transformer, and

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:

1. Without the RF gasket (Magnetron).

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

3. If the door is not closed.

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

Oven cavity.

3) Sharp edge:

Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate.

4) Movable parts (to prevent a fault)

Blower fan blade, Blower fan motor, Switches, Switch levers, Antenna motor and Sirrer antennas.

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 Pictorial Diagram.

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

OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL

To remove the components, procedure as follows.

1. Disconnect the power supply cord.

2. Remove the screws from the rear and along side the edge of the outer case.

3. Slide the case back about 1 inch (3 cm) to free it from the oven cavity.

4. Lift entire case from the unit.

5. DISCHARGE TWO HIGH VOLTAGE CAPACITORS BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

6. Now, outer case is free.

To remove rear cabinet and power supply cord:

7. Remove the screws holding the rear cabinet to the oven

cavity and blower motor.

8. Remove the one (1) screws holding the switch mounting angle to the rear cabinet and release the switch mounting angle from the rear cabinet.

9. Disconnect the power supply cord from the supply harness.

10.Remove the one (1) screws holding the grounding wire of power supply cord to the oven cavity.

11.Remove the rear cabinet with the power supply cord from the oven cavity.

12. Loosen the tab of the cord bushing, and remove the power

supply cord with the cord bushing from the rear cabinet.

13.Remove the cord bushing from the power supply cord,

14.Now, the power supply cord and rear cabinet are free.

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R-25JT-F

POWER TRANSFORMERS (1) AND/OR (2) REMOVAL

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect wire leads of power transformers (1) and/or (2) from magnetrons (1) and/or (2).

5. Remove the wire leads of power transformers from the wire holder.

6. Pull out the wire leads of power transformers from the tube.

7. Disconnect wire leads of power transformers (1) and/or (2)

MAGNETRONS (1) AND/OR (2) REMOVAL

Removal

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Remove the two (2) screws holding magnetron exhaust duct to upper and lower waveguide.

5. Remove the magnetron exhaust duct from oven cavity.

6. Disconnect wire leads from magnetrons (1) and/or (2).

7. Disconnect magnetron thermistor from the connector of the stop switch harness.

8. Remove the one (1) screw holding the thermistor angle to the upper magnetron.

from high voltage capacitors (1) and/or (2).

8. Disconnect the high voltage wire lead(s) from power transformers (1) and/or (2).

9. Disconnect the main wire harness from power transformers (1) and/or (2).

10.Remove two (2) screws holding each power transformer (1) and/or (2) to base plate.

11.Remove the power transformers (1) and/or (2) from base plate.

12.Now, power transformers (1) and/or (2) are free.

9. Remove the four (4) screws holding each magnetron (1) and/or (2) to upper and/or lower waveguide. When removing the screws, hold the magnetron to prevent it from falling.

10.Remove the magnetrons (1) and/or (2) from upper and/or lower waveguide with care so magnetron antenna is not hit by any metal object around antenna.

11.Pull out the thermistor angle from the upper magnetron (1).

12.Remove the thermo-contactor from the upper magnetron (1).

13.Now, the magnetrons (1) and/or (2) are free.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE

THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY.

MAGNETRON THERMISTOR REPLACEMENT

Removal

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Remove the upper magnetron from the upper waveguide flange, referring to "MAGNETRON (1) AND /OR (2) REMOVAL".

5. Now, the upper magnetron with the magnetron thermistor should be free.

6. Remove the thermistor angle from the upper magnetron by pulling out.

7. Straighten the tab of the magnetron thermistor angle holding the magnetron thermistor.

8. Remove the magnetron thermistor from the thermistor angle.

9. Now, the magnetron thermistor is free.

Re-install

1. Apply the silicone grease (Shinetsu silicone grease G746 of Shinetsu Chemical Co. Ltd.) to the thermo-contactor and the magnetron thermistor.

2. Insert the thermo-contactor between the 1st. fin and the 2nd. fin.

3. Install the magnetron thermistor to the thermistor angle as shown in Figure C-1.

4. Hold the magnetron thermistor to the thermistor angle by bending the tab of the thermistor angle.

5. Insert the thermistor angle between the 2nd. fin and 3rd. fin from the upper fin of the upper magnetron and push it until the thermistor angle stops.

NOTE:The magnetron thermistor should be between the

upper fin and the 2nd. fin.

6. Re-install the upper magnetron to the upper waveguide flange with four (4) screws.

7. Re-install the thermistor angle to the upper waveguide flange with one (1) screw.

8. Re-install the magnetron exhaust duct to the upper and lower waveguide flanges with two (2) screws.

9. Route the thermistor harness under the magnetron temperature fuse.

10.Connect the thermistor harness to the stop switch harness.

11.Connect the wire leads to the upper magnetron, referring to the pictorial diagram.

12.Re-install the power supply cord, rear cabinet and outer case cabinet to the oven by reversing the procedures of "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

CAUTION: WHEN REPLACING MAGNETRON, BE SURE

THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY.

Upper magnetron

Upper fin

Thermo contactor

Thermistor angle

Tab

Apply grease here.

Magnetron thermistor

Figure C-1. Magnetron thermistor installation

Page 35

HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

R-25JT-F

1. Disconnect the power supply cord and then remove outer case and rear cabinet , referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Remove two (2) screws holding ground side terminals of high voltage rectifier assembly to the capacitor holder and oven cavity.

5. Disconnect all wire leads from the high voltage capacitor.

6. Disconnect wire leads of high voltage rectifier assembly from the power transformers (1) and/or (2). Now, high voltage assembly is free.

7. Remove the three (3) screws holding the blower motor to the top of oven cavity, the chassis support and air duct.

8. Remove two (2) screws holding the capacitor holder to oven cavity.

HOW TO RELEASE THE POSITIVE LOCK® CONNECTOR.

Procedure

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Pushing the lever of positive lock® connector, pull down the connector from the terminal.

5. Now, the connector is free.

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

remove it. If you do not, you can not push the lever of positive lock®.

CAUTION: THE POSITIVE LOCK® TERMINAL CAN NOT BE

REMOVED BYJUST PULLING ON IT. THE LOCK LEVER MUST BE RELEASED TO REMOVE THE CONNECTOR FROM THE TERMINAL.

Now, the capacitors (1), (2) and the high voltage rectifier assembly are free.

CAUTION:

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

2. DO NOT REPLACE ONLY THE HIGH VOLTAGE RECTIFIER. IF IT IS DEFECTIVE, REPLACE THE HIGH VOLTAGE RECTIFIER ASSEMBLY.

3. WHEN REPLACING THE HIGH VOLTAGE RECTIFIER ASSEMBLY AND THE HIGH VOLTAGE CAPACITOR, THE GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

Terminal

Positive lock® connector

Push

Lever

Pull down

Figure C-2. How to release the positive lock connector.

BLOWER MOTOR REMOVAL

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect the main wire harness from the blower motor and noise filter.

5. Remove the two (2) screws holding the blower motor angle

STIRRER MOTORS (UPPER AND LOWER) REMOVAL

UPPER

1. Disconnect the power supply cord and then remove outer case, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Disconnect the wire leads from the stirrer motor (upper).

5. Remove the one (1) screw holding the stirrer motor (upper) to the oven cavity.

6. Turn and lift up the stirrer motor (upper).

7. Now, the stirrer motor (upper) is free.

LOWER

1. Disconnect the power supply coed.

to the oven cavity.

6. Remove the one (1) screw holding the blower motor angle to the chassis support.

7. Remove the blower motor from the oven cavity.

8. Remove the two (2) screws holding the noise filter angle to the blower motor.

9. Now, the blower motor is free.

2. Remove the stirrer motor cover by snipping off the material in four portions.

3. Where the portions have been snipped off bend the portions flat. No sharp edge must be evident after removal of the stirrer motor cover.

4. Disconnect the wire leads from the stirrer motor (lower).

5. Remove the one (1) screw holding the stirrer motor (Lower) to the oven cavity.

6. Now, the stirrer motor (lower) is free.

7. After replacement use one (1) screw to fit the stirrer motor cover. (This screw has been fitted to the base plate near the stirrer motor cover beforehand.)

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CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

CONTROL PANEL ASSEMBLY REMOVAL

The complete control panel should be removed for replacement of components. To remove the control panel, proceed as follows:

1. Disconnect the power supply cord.

Remove the air intake filter assembly from the base plate.

3. Remove two (2) screws holding the control panel to the base plate.

4. Pull down the control panel and remove it forward.

5. Disconnect connectors (A), (B), (D), (H), wiring from tab terminal 1 and 2 and wiring from RY1 and RY2.

6. Now the control panel assembly is free.

CAUTION FOR TOUCH CONTROL PANEL REMOVAL

Hold the lower end (Position A, Fig. 1) of the touch control panel assembly firmly while sliding it down and toward you.

DO NOT FORCE THE CONTROL UNIT TO SLIDE DOWN DURING REMOVAL. THIS MAY CAUSE DAMAGE TO THE CONTROL UNIT BY HITTING THE TAB TERMINALS LOCATED AT THE FRONT OF THE OVEN CAVITY.

2) If the Touch Control Panel is hard to remove;

(1) Insert a flat head screw driver into space B . (Fig. 1) (2) Rotate the screwdriver clockwise while holding position C

of the Touch Control Panel. (Fig. 2)

TO AVOID DAMAGE TO TOUCH CONTROL PANEL, COVER THE TIP OF SCREWDRIVER WITH TAPE.

Replacement of individual component is as follows:

CONTROL UNIT AND CONTROL PANEL FRAME (WITH KEY)

7. Remove two (2) screws holding the control panel mounting angle to the panel frame.

8. Lift up the control panel mounting angle from the panel frame.

9. Disconnect connector (G) from the control unit by pushing the hooks of cable holder inwardly.

10.Remove five (5) screws holding the control unit to the panel frame assembly.

11.Push down the right side two (2) hooks fixing the control unit to the panel frame assembly, and lift up the control unit

upward.

12.Now, the control unit and control panel frame (with key) are free.

CAUTION: When installing the control unit into the control panel frame:

1. Be careful not to damage any of the components on the control unit.

2. When inserting key units ribbon cable through the frame, ensure it is not pinched or bent. Ensure the control unit is pushed upward to lock into the control panel frame prior to screwing the control unit into the frame.

3. Ensure there are not any wires near the varistors, if the explode, they may damage the wires.

NOTE: 1. Before attaching a new key unit, remove

remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol.

2. 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 control panel frame.

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

Fig. 1

TOUCH CONTROL PANEL

SCREW DRIVER

Fig. 2

VOLTAGE SELECT SWITCH REMOVAL

1. Disconnect the power supply cord and then remove outer case and rear cabinet, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Now, the switch mounting angle should be removed from the rear cabinet.

3. Remove the two (2) screws and the two (2) nuts holding the

voltage select switches and the switch spacer to the switch mounting angle.

4. Remove the voltage select switches and the switch spacer f rom the switch mounting angle.

5. Now, the voltage select switches are free.

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR

SWITCHES (1), (2) REPLACEMENT

REMOVAL

1. Disconnect the power supply cord and then remove outer case, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Remove outer control panel reffering to "CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL".

5. Disconnect all wire leads from the all switches.

6. Remove two (2) screws holding latch hook to oven flange.

7. Remove latch hook assembly from oven flange.

8. Remove the switch(es) in accordance with following

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R-25JT-F

procedure.

DOOR SENSING SWITCH

Push the two (2) tabs outward and pull switch forwards to release switch.

MONITOR SWITCHES OR SECONDARY INTERLOCK

SWITCHES Remove one (1) screw and nut holding two switches together to latch hook.

8. Now, switch(es) is now free.

RE-INSTALL

1. Re-install the switch(es) in accordance with following procedure.

DOOR SENSING SWITCH

Mount the door sensing switch in the lower position of latch hook.

MONITOR SWITCHES

1) Mount the two (2) switches side by side in the top position

of the latch hook.

2) Fasten both switches together to latch hook with one (1) screw and nut.

SECONDARY INTERLOCK SWITCHES

1) Mount the two (2) switches side by side in the middle position of the latch hook.

2) Fasten both switches together to latch hook with one (1) screw and nut.

2. Re-install latch hook assembly and fasten it to oven flange with two (2) screws.

3. Re-connect all wire leads to all switches, referring to pictorial diagram. Be careful to ensure proper connection of the wire leads.

4. Make sure that the monitor switches (1), (2) and all other switches are operating properly. And check continuity of the monitor circuit. Refer to chapter "Test Procedure" and Adjustment procedure.

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR

SWITCHES (1), (2) ADJUSTMENT

1. Disconnect the power supply cord and then remove outer case, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

If the door sensing switch, secondary interlock switches (1), (2) and monitor switches (1), (2) do not operate properly due to a misadjustment, the following adjustment should be made.

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

5. With door closed, adjust latch hook by moving 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 hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switches (1), (2) are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the monitor switches (1), (2) are activated with the door closed.

6. Secure the screws with washers firmly.

7. Check the operation of all switches. If all switches have not activated with the door closed, loosen two (2) screws and adjust the latch hook position.

After adjustment, check the following.

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

2. The door sensing switch and secondary interlock switches (1), (2) interrupt the circuit before the door can be opened.

3. Monitor switches (1), (2) contacts close when door is opened.

4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

Door release lever

Joint lever

Latch lever

Latch head

Switch lever A

Monitor switch (2)

Monitor switch (1)

Latch hook

Switch lever B

Secondary interlock switch (2)

Secondary interlock switch (1)

Door sensing switch

Switch lever C

Figure C-3. Latch Switch Adjustments

DOOR REPLACEMENT

REMOVAL

1. Disconnect the power supply cord and then remove outer case, referring to "OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL".

2. Open the oven door and block it open.

3. Discharge two high voltage capacitors.

4. Remove the two (2) screws holding each of the upper and lower oven hinges to the oven cavity.

5. Remove door assembly with upper and lower oven hinges by pulling it forward.

6. Release upper and lower oven hinges from door assembly.

7. Now, door assembly is free.

NOTE:When individual parts are replaced, refer to "Door

Disassembly".

RE-INSTALL

1. Insert the upper and lower oven hinges into door hinge pins.

2. Insert the upper and lower oven hinges with door assembly into rectangular holes of oven cavity front plate.

3. Make sure that the door is parallel with oven face lines (left and upper side line) and door latch heads pass through the latch holes correctly.

4. Fasten upper and lower oven hinges firmly to oven cavity with two (2) screws on each hinge.

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R-25JT-F

Note: After any service to the door; (A) Make sure that door sensing switch, secondary

interlock switches (1), (2) and monitor switches (1), (2) are operating properly. (Refer to chapter "Test Procedures".).

(B) An approved microwave survey meter should be used

to assure compliance with proper microwave radiation emission limitation standards.

DOOR ADJUSTMENT

Door adjustment is performed with the door properly installed and closed and while the oven hinges are loose.

1. Loosen upper and lower oven hinges with phillips head screw driver.

2. Adjust the door by moving it vertically so that the top right hand corner of the door is in line with the top of the control panel frame assembly.

3. Tighten the upper and lower oven hinge screws.

After adjustment, make sure of the following:

1. Door latch heads smoothly catch the latch hook through the latch holes, and the latch head goes through the center of the latch hole.

2. Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1.0mm.

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

4. Re-install outer case and check for microwave leakage around 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 oven cavity during cook cycle.

This function does not require that door be air-tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from oven cavity. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

UPPER OVEN HINGE

OUTER CASE CABINET

LOWER OVEN HINGE

LATCH HEADS

Figure C-4. Door Replacement

DOOR DISASSEMBLY

CHOKE COVER REMOVAL

1. Open the door and insert a putty knife (thickness of about

0.5mm) in gap between the choke cover and corner portion of door panel to free engaging parts. Refer to Fig. C-5.

NOTE:As the choke cover and door panel are engage at 16

places, do not force any perticular part.

2. Remove the choke cover carefully. (If choke cover is broken, replace with a new one.)

PUTTY KNIFE

DOOR HANDLE

DOOR COMPONENTS REMOVAL

DOOR HANDLE REMOVAL

1. Remove the door assembly from oven cavity, referring to "DOOR REMOVAL".

2. Place door assembly on a soft cloth with latches facing up.

CHOKE COVER

UPPER OVEN HINGE

CHOKE COVER

BENT

LOWER OVEN HINGE

LATCH HEAD

Figure C-5. Choke cover

PUTTY KNIFE

BENT

DOOR PANE

FRONT

3. Remove choke cover from door panel, referring to "CHOKE COVER REMOVAL".

4. Remove two (2) screws holding the door handle to door.

5. Remove the door handle from door panel.

6. Now, door handle is free.

UPPER AND LOWER LATCH HEADS REMOVAL

7. Remove the door release lever from the door assembly.

8. Remove the three (3) screws holding the joint plate to the door panel.

9. Release the latch spring from the tab of the joint lever and joint plate.

10.Release the latch heads from joint lever and joint plate.

11.Now, the latch heads are free.

DOOR CASE REMOVAL

1. Remove the door assembly from oven cavity, referring to "DOOR REMOVAL".

2. Remove choke cover from door panel, referring to "CHOKE COVER REMOVAL".

3. Remove door handle from door panel, referring to "DOOR HANDLE REMOVAL".

4. Bend up four (4) nails of door case.

5. Remove door case from door panel.

6. Now, the door case is free.

DOOR GLASS REMOVAL

7. Remove the four (4) screws holding two (2) outside window fixing plates to door panel.

8. Now, the door glass is free.

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R-25JT-F

RED

BLK

CN-H

RED

BLK

WHT

RED

WHT

CN-B

GRN

ORG

BLK

GRN

TOUCH CONTROL

PANEL

CN-B

CN-H

RY2(1)

RY3(2)

SP1

TAB2

TAB1

RY1

BLK

CN-A

YLW

BRN

COM COM

Blue case

Blue

case

MONITOR

SWITCH (1)

(CABINET SIDE)

MONITOR

SWITCH (2)

(OVEN SIDE)

COM

WHT

BLK

GRY

SECONDARY

INTERLOCK

SWITCH (1)

(CABINET SIDE)

SECONDARY

INTERLOCK

SWITCH (2)

(OVEN SIDE)

ORG

GRN

COM

DOOR

SENSING

SWITCH

OVEN

LAMP

SOCKET

OVEN

THERMISTOR (1)

OVEN

THERMISTOR (2)

MAGNETRON

THERMISTOR

HICH VOLTAGE COMPONENTS

HIGH VOLTAGE

CAPACITOR

HIGH VOLTAGE

CAPACITOR

H.V. RECTIFIER

MAGNETRON

(LOWER)

MAGNETRON

(UPPER)

POWER

TRANSFORMER

POWER

TRANSFORMER

BLU

WHT

ORG

STIRRER MOTOR

(LOWER)

MAGNETRON TEMP.

FUSE (1) 150˚C

OVEN TEMP.

FUSE 120˚C

BRN

BLK

RED

BLK

ORG

STIRRER MOTOR

(UPPER)

BLK

WHT

BLK

GRY

ORG

WHT

BLU

RED

COM

BLK

GRY

BRN

VOLTAGE SELECT SWITCHES

for Control panle

(Cabinet side)

for front Power

transformer

for rear Power

transformer (Oven side)

(1) (2)

(2)

(1)

(1) (2)

(3)

(2)

(1)

(1) (2)

(1)

(2)

BLK

RED

WHT

RED

MAGNETRON TEMP.

FUSE (2) 150˚C

White

Case

Blue

Case

Black tape

WHT

BLK

WHT

BLK

GRN

POWER SUPPLY CORD

230/208V 60Hz

WHT

BLK

BLOWER

MOTOR

NOISE FILTER AND FUSE

BLK

BLU

RED

NOTE:

THE GROUNDING WIRE OF THE POWER

SUPPLY CORD HAS BEEN GROUDED BY A

SCREW.

THE SCREW MUST ALWAYS BE KEPT TIGHT.

Figure S-1. Pictorial Diagram

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R-25JT-F

–

A 3

A 5

A 7

A 1

N C

COM

N C

COM

TB2

TB1

B 1 B 2

B 3 H 1 H 3

G12

G11

G10

G 9

G 1 G 2 G 3 G 4 G 5 G 6 G 7 G 8

(J1)

(J2)

D1-D4

10EDB10

D3 D4

C1 2200µ/25v

C2 0.1µ/50v

0.1µ/50v

Q1 KIA7805PI

C3 47µ/10v

C4 0.1µ/50v

C64 5.6k

KRC101M

R65

6.8k

(J9)

R66

4.7k

DTA123ES

R3 4.7k

ZD2

HZ4A2

(J4)

(J6)

(J3)

(J5)

RY1

RY2

RY3

D21

D20

D22

Q21

KRC101M

Q20

DTB143ES

R4 4.7k

R40 2.7k

SP1

R30 100R31 15k

R32 2.7k

C21

10µ/25v

C20

0.1µ/50v

R5 4.7k

(B)

(A)

Q60 KRA101M

Q22

DTD143ES

Q23 DTD143ES

R102 4.7k

D100

D101

C30 47µ/10v

C31

C61

C70

R70 4.7k

R71 4.7k

D70

CT1

R100 820F

C100 47µ/10v

R101 100k

C101

(B)

D23 10EDB10

C60

0.1µ

/50v

R60 1.1k

R61 4.7k

R62 33k

R63 1.5k

R64 4.7k

47µ/10v

0.1µ/50v

C63

C62

0.1µ/50v

TEST

VCC

SCL

SDA

VSS

VCC

VEE

AVSS

VREF

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

P55

P54

P53

P52

P51

P50

P47

P46

P45

P44

P43

P42

INT1

INT0

RESET

P71

P70

XIN

XOUT

VSS

P30

P31

P32

P33

P34

P35

P36

P37

P00

P01

P02

P03

P04

P05

P06

P07

P10

P11

P12

P13

P14

P15

P16

P17

P20

P21

P22

P23

P24

P25

P26

P27

IC1

IZA633DR

CF1 CST4.00MGW

R80 4.7k

R81 4.7k

R82 4.7k

R83 4.7k

R88 4.7k

R87 4.7k

R86 4.7k

R85 4.7k

R84 4.7k

R50 100

R51 100

R52 100

R53 100

R54 100

R55 100

R56 100

R57 100

R58 100

GND 17 16 15 14 13 12 11 01

10 11 12 13

(A)

LED1

LIGHT EMITTING DIODE

SELECTA

POWER

DOUBLE

QUANTITY

START SET

SELECTA

TIME

EXPRESS

DEFROST

STOP/

CLEAR

CHECK

SIGNAL

ON DEF. NO. X 2 CHECK

DOOR

SWITCH

OVEN

THERMISTOR (1)

OVEN

THERMISTOR (2)

MAGNETRON

THERMISTOR

NOTE : IF NOT SPECIFIED, 1/4w ± 5%

IF NOT SPECIFIED, 1SS270A

IF NOT SPECIFIED, 0.01µ / 16v

AC230V

60Hz

OVEN LAMP

STIRRER

MOTOR

BLOWER

MOTOR

MICRO 1

MICRO 2

IC2

IC3

VRS1

VRS2

10G471K

AC208V

60Hz

R2 470 R1 470

ZD1

HZ12B1

C10

20k 10k

C8 0.1µ/50v

R33

4.7k

Figure S-2. Control Panel Circuit

Page 41

R-25JT-F

DIP

R30

C31

Q60

R83

CN-1

RY2

C83 R82

C82

R81

C81

R80

C80

R58

R57

IC1

R56 R55 R54

R53 R52

R51

R50

(J91) (J90) (J89)

J88 J87 J86

J85

R60

D70

D23

C62

CN-H

POWER

RY1

(J1)

(VRS2)

R64

R63

CT1

VRS1

CN-G

R84

C60

CN-B

MICRO 1

MICRO 2

RY3

TB2

TB1

(J2)

TTM

R71

D20

Q21

C30

R62

R61

C70

R70

C63

Q22

D21

R102

(C10)

Q23

D22

C100

D100

R100

Q20

IC2

R101

C20

C21

C61

D101

(J9)

(R2)

CF1

(R1)

(J4)

ZD2

IC3

C101

R31

R33

R32

CN-D

(J3)

(J5)

(J6)

R40

R65

R66

C64

SP1

(ZD1)

Figure S-3. Printed Wiring Board

Page 42

R-25JT-F

PARTS LIST

Note: The parts marked “∆” may cause undue microwave exposure.

The parts marked “*” are used in voltage more than 250V.

REF. NO. PART NO. DESCRIPTION Q'TY CODE

ELECTRIC PARTS

1- 1 FH-HZA064WRE0 Oven thermistor (2) 1 AV 1- 2 QSOCLA026WRZZ Oven lamp socket 2 AF 1- 3 RV-MZA295WRE0 Magnetron 2 BF

∆

1- 4 FMOTEA503WRKZ Blower motor 1 1- 5 FPWBFA383WRKZ Noise filter 1 AN 1- 6 FACCDA114WRKZ Power supply cord 1 AZ 1- 7 FH-HZA070WRE0 Oven thermistor (1) & Magnetron thermistor 2 AM 1- 8 FW-QZA117WRK0 High voltage rectifier assembly 1 AU

1- 9 FFS-BA033WRKZ Monitor switch (V-5220Q) and fuse (20A) assembly 2 -1-10 QSW-MA087WRE0 Voltage select switch 3 AF 1-11 QSW-MA085WRE0 Secondary interlok switch and Door sensing switch 3 AF 1-12 RC-QZA260WRE0 High voltage capacitor 2 AU

1-13 RLMPTA081WRZZ Oven lamp 2 AK 1-14 RMOTDA209WRE0 Stirrer motor 2 AR 1-15 QFS-TA014WRE0 Temperature fuse 150C (MG.) 2 AG 1-16 QFS-TA015WRE0 Temperature fuse 120C (OVEN) 1 AG 1-17 RTRN-A594WRE0 Power transformer 2 BM

CABINET PARTS

2- 1 FDAI-A275WRTZ Base plate assembly 1 BC 2- 2 PSHEGA009WREZ Rubber sheet D 2 AF 2- 3 PSHEGA010WREZ Rubber sheet E 2 AE 2- 4 GCOVAA271WRW0 Rear cabinet 1 AX 2- 5 FFTASA064WRY0 Oven lamp access cover assembly 1 AN 2- 5-1 PCUSUA585WRPZ Cushion 1 AF 2- 5-2 PREFHA059WRP0 Reflector 1 AF 2- 6 GCABUA860WRPZ Outer case cabinet 1 BD 2- 7 FFPF-A016WRK0 Vibration-proof sheet 1 AU 2- 8 TMAPCA778WRRZ Schematic diagram 1 AE

CONTROL PANEL PARTS

3- 1 DPWBFB975WRU0 Control unit [R-25JT-F] 1 BG 3- 1A QCNCMA308DRE0 4-pin connector (A) 1 AC 3- 1B QCNCMA312DRE0 3-pin connector (B) 1 AB 3- 1C QCNCMA039DRE0 3-pin connector (H) 1 AB 3- 1D QCNCWA030DRE0 12-pin connector (G) 1 AE 3- 1E QLUGPA012DRE0 Tab terminal (TAB1,TAB2) 2 AB C1 VCEAB51EW228M Capacitor 2200 uF 25V 1 AE C2 VCKYD11HF104Z Capacitor 0.1 uF 50V 1 AB C3 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C4 VCKYD11HF104Z Capacitor 0.1 uF 50V 1 AB C5 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C6 VCKYD11HF104Z Capacitor 0.1 uF 50V 1 AB C7 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C8-9 VCKYD11HF104Z Capacitor 0.1 uF 50V 2 AB C10 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C20 VCEAB31HW104M Capacitor 0.1 uF 50V 1 AM C21 VCEAB31EW106M Capacitor 10 uF 25V 1 AA C30 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C31 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C60 VCKYD11HF104Z Capacitor 0.1 uF 50V 1 AB C61 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C62 VCKYD11HF104Z Capacitor 0.1 uF 50V 1 AB C63 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C64 VRD-Q12EF562J Resistor 5.6k ohm 1/4W 1 AA C70 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA C100 VCEAB31AW476M Capacitor 47 uF 10V 1 AA C101 VCKYD11CY103N Capacitor 0.01 uF 16V 1 AA CF1 RCRS-A010DRE0 Ceramic resonator CST4.00MGW 1 AD D1-4 VHD10EDB10+-1T Diode (10EDB10) 4 AB D20-22 VHD1SS270A/-1 Diode (1SS270A) 3 AA D23 VHD10EDB10+-1T Diode (10EDB10) 1 AB D70 VHD1SS270A/-1 Diode (1SS270A) 1 AA D100-101 VHD1SS270A/-1 Diode (1SS270A) 2 AA IC1 RH-IZA633DRE0 LSI 1 AW IC2 RH-IZA980DRE0 IC (AT24C02-10PC2.5) 1 AN IC3 RIC--A025BDE0 IC (KID65004AP) 1 AE

Page 43

REF. NO. PART NO. DESCRIPTION Q'TY CODE

LED1 VHPSL3966T/1B Light emitting diode 1 AS Q1 RIC--A022BDE0 IC (KIA7805PI) 1 AE Q2 VSDTA123ES/-3 Transistor (DTA123ES) 1 AA Q3 RH-TZA036CBE0 Transistor (KRC101M) 1 AA Q20 VSDTB143ES/-3 Transistor (DTB143ES) 1 AC Q21 RH-TZA036CBE0 Transistor (KRC101M) 1 AA Q22-23 VSDTD143ES/-3 Transistor (DTD143ES) 2 AC Q60 RH-TZA037CBE0 Transistor (KRA101M) 1 AA R1-2 VRD-Q12EF471J Resistor 470 ohm 1/4W 2 AA R3-5 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 3 AA R30 VRD-Q12EF101J Resistor 100 ohm 1/4W 1 AA R31 VRD-Q12EF153J Resistor 15k ohm 1/4W 1 AA R32 VRD-Q12EF272J Resistor 2.7k ohm 1/4W 1 AA R33 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 1 AA R40 VRD-Q12EF272J Resistor 2.7k ohm 1/4W 1 AA R50-58 VRD-Q12EF101J Resistor 100 ohm 1/4W 9 AA R60 VRD-Q12EF112J Resistor 1.1k ohm 1/4W 1 AA R61 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 1 AA R62 VRD-Q12EF333J Resistor 33k ohm 1/4W 1 AG R63 VRD-Q12EF152J Resistor 1.5k ohm 1/4W 1 AA R64 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 1 AA R65 VRD-Q12EF682J Resistor 6.8k ohm 1/4W 1 AA R66 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 1 AA R70-71 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 2 AA R80-88 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 9 AA R100 VRN-R12EK821F Resistor 820 ohm (F) 1/4W 1 AA R101 VRD-Q12EF104J Resistor 100k ohm 1/4W 1 AA R102 VRD-Q12EF472J Resistor 4.7k ohm 1/4W 1 AA (J5) VRD-Q12EF203J Resistor 20k ohm 1/4W 1 AA (J6) VRD-Q12EF103J Resistor 10k ohm 1/4W 1 AA RY1 RRLY-A071DRE0 Relay (OJE-SS-112LM) 1 AG RY2-3 RRLY-A094DRE0 Relay (OMIF-S-112LM) 2 AN SP1 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG T1 RTRNPA095DRE0 Touch control transformer 1 AU CT1 RTRN-026CHRE0 Current transformer 1 AH VRS1-2 RH-VZA034DRE0 Varistor (10G471K) 2 AD ZD1 VHEHZ12B1//-1 Zener diode (HZ12B1) 1 AB ZD2 VHEHZ4A2///-1 Zener diode (HZ4A2) 1 AA 3- 2 FPNLCB468WRK0 Control panel frame with key unit 1 AZ 3- 2-1 FUNTKA773WRE0 Key unit 1 AT 3- 2-2 HDECAA195WRP0 Decoration metal fittings 1 AP 3- 2-3 PCUSUA417WRP0 Cushion 1 AB 3- 3 LANGTA243WRW0 Control panel mounting angle 1 AF 3- 4 XEPS730P10XS0 Screw; control unit mounting 5 AA 3- 5 XEPS740P12000 Screw; control panel mounting angle mounting 2 AA 3- 6 LX-BZA138WREZ Screw; decoration panel mounting for earth 1 AB

OVEN PARTS

4- 1 PGLSPA632WREZ Lamp glass 1 AG 4- 2 FDUC-A345WRY0 Exhaust duct assembly 1 AP

∆

4- 3 ************* Oven cavity (Not a replaceable part) 1 -4- 4 PFILWA063WRPZ Oven light screen (Inside) 1 AD 4- 5 MLEVPA153WRF0 Switch lever A 1 AC 4- 6 MLEVPA154WRF0 Switch lever B 1 AC 4- 7 MLEVPA155WRF0 Switch lever C 1 AC 4- 8 MSPRCA075WRE0 Switch spring A 1 AB 4- 9 MSPRCA076WRE0 Switch spring B 2 AB 4-10 PHOK-A081WRF0 Latch hook 1 AP

∆

4-11 MHNG-A216WRM0 Lower oven hinge 1 AG

∆

4-12 PSPAGQ002YBE0 Vibration-proof spacer 1 AA 4-13 PCUSU0407WRP0 Cushion 2 AA 4-14 FGLSPA067WRYZ Ceramic shelf 1 BH 4-15 FPLT-A008WRY0 Stirrer antenna upper assembly 1 AV 4-16 FPLT-A009WRY0 Stirrer antenna lower assembly 1 AV 4-17 LANGKA762WRP0 Partition angle R 1 AE 4-18 LANGQA228WRW0 Oven lamp mounting plate 1 AF 4-19 LBNDKA068WRP0 Capacitor holder 1 AD 4-20 PGIDHA054WRW0 Water-proof cover 1 AF 4-21 NSFTPA031WRF0 Antenna motor shaft 2 AH 4-22 LANGQA622WRPZ Noise filter angle 1 AK 4-23 PCUSUA417WRP0 Cushion 1 AB 4-24 MHNG-A215WRM0 Upper oven hinge 1 AG

∆

4-25 PCUSUA413WRP0 Cushion 1 AG 4-26 PCUSUA415WRP0 Cushion 3 AC

R-25JT-F

Page 44

R-25JT-F

REF. NO. PART NO. DESCRIPTION Q'TY CODE

4-27 PDUC-A729WRF0 Air duct 1 AL 4-28 PDUC-A564WRW0 Mg exhaust duct 1 AP 4-29 PCUSUA414WRP0 Cushion 1 AD 4-30 LANGKA679WRPZ Fixing angle S 1 AD 4-31 HDECQA147WRM0 Corner cap right 1 AE 4-32 LANGFA195WRW0 Chassis support 1 AG 4-33 LBSHCA014WRE0 Cord bushing 1 AF 4-34 LANGQA593WRPZ Blower motor angle 1 AH 4-35 FFIL-A003WRK0 Air intake filter assembly 1 AV 4-36 HDECEA001WRP0 Decoration sash 1 AR 4-37 HDECQA146WRM0 Corner cap left 1 AE 4-38 PCUSGA409WRP0 Cushion 2 AE 4-39 PCOVPA422WRFZ Splash cover 1 BK 4-40 LANGQA512WRP0 Thermistor angle 1 AE 4-41 LANGKA475WRP0 Switch mounting angle 1 AD 4-42 LANGKA760WRP0 Switch lever 1 AE 4-43 PCUSUA268WRP0 Cushion 1 AA 4-44 MSPRCA101WRE0 Switch lever spring C 1 AC 4-45 LSUB-A133WRPZ Thermo contactor 1 AD 4-46 LANGTA408WRWZ Lamp glass mounting plate 1 AK 4-47 PSPA-A114WRF0 Switch spacer 1 AC 4-48 LSUB-A134WRPZ Hinge support angle 1 AD

DOOR PARTS

∆

5 CDORFB029WRKZ Door assembly 1 BT 5- 2 GCOVAA242WRY0 Door case 1 BD 5- 3 FHNDMA011WRY0 Door lever assembly 1 AP

∆

5- 4 GCOVHA350WRF0 Choke cover 1 AR 5- 5 JHNDMA039WRM0 Door handle 1 AX 5- 6 LANGKA766WRP0 Outside window fixing plate 2 AF 5- 7 PCUSGA430WRP0 Cushion 2 AM 5- 8 PGLSPA457WRE0 Door glass 1 AV 5- 9 PPACGA142WRP0 Door case packing 2 AF 5-10 PGID-0024WRF0 Handle guide 4 AC 5-11 PGID-0025WRF0 Handle spacer 1 AC 5-12 PSPA-A102WRE0 Door case spacer 2 AE 5-13 XHTS740P08RV0 Screw : 4mm x 8mm 9 AG 5-14 FANGKA200WRY0 Latch fixing angle 1 AQ 5-15 FLEVFA019WRY0 Joint lever 1 AP 5-16 LSTPCA002WRM0 Latch head 2 AM

∆

5-17 MLEVPA220WRF0 Head lever 1 AM 5-18 MSPRCA097WRE0 Latch spring 1 AG 5-19 HBDGCA090WRE0 Door badge 1 AF 5-20 PCUSGA486WRP0 Handle cushion 1 AM

MISCELLANEOUS

6- 1 TINSEB105WRRZ Instruction manual 1 AG 6- 2 TLABHA024WRR0 Menu sticker 1 AH 6- 3 FW-VZB755WRE0 Switch harness 1 AQ 6- 4 FW-VZC077WREZ Main wire harness 1 BD 6- 5 LHLDWQ005YBE0 Purse lock LL 1 AA 6- 6 LBNDKA079WRE0 Wire holder 3 AB 6- 7 FW-VZC039WREZ Supply harness 1 AL 6- 8 TCAUAA130WRR0 Lamp caution 1 AC 6- 9 QW-QZA238WRE0 High voltage wire 2 AF 6-10 TCAUAA288WRRZ Monitor caution label 1 AD

6-11 TCAUA0165WRR0 DHHS caution label 1 AB 6-12 TCAUAA279WRRZ Voltage caution label 1 AF 6-13 LHOLDA004WRE0 Cord holder 1 AA 6-14 TCAUAA181WRR0 Filter caution label 1 AC 6-15 TCAUAA165WRR0 User caution 1 AC 6-16 LHLDWQ004YBE0 Purse lock L 1 AA

SCRE,NUTS AND WASHERS

7- 1 XCBWW30P08000 Screw : 3mm x 8mm 6 AB 7- 2 XBPS730P28KS0 Screw : 3mm x 28mm 2 AB 7- 3 XNES730-24000 Nut : 3mm x 2.4mm 4 AE 7- 4 LX-BZA130WRE0 Special screw 1 AD 7- 5 LX-BZA116WRE0 Special screw 2 AD 7- 6 LX-BZA041WRE0 Special screw 2 AA 7- 7 LX-BZA132WREZ Special screw 4 AB 7- 8 LX-BZA138WREZ Special screw 11 AB 7- 9 LX-BZA139WREZ Special screw 1 AA

Page 45

R-25JT-F

REF. NO. PART NO. DESCRIPTION Q'TY CODE

7-10 LX-EZA004WRE0 Special screw 2 AA 7-11 XOTS740P06000 Screw : 4mm x 6mm 1 AA 7-12 LX-NZ0082WRE0 Special nut 1 AA 7-13 LX-BZA152WREZ Special screw 1 AB 7-14 LX-BZA164WREZ Special screw 12 AC 7-15 LX-CZA095WREZ Special screw 3 AB 7-16 LX-WZA035WRE0 Special washer 1 AB 7-17 XOTS740P10RV0 Screw : 4mm x 10mm 3 AB 7-18 XOTS740P08000 Screw : 4mm x 8mm 6 AA 7-19 XCHWW40P08000 Screw : 4mm x 8mm 2 AB 7-20 XBPS730P50K00 Screw : 3mm x 50mm 2 7-21 XJPS740P10000 Screw : 4mm x 10mm 3 AA 7-22 XOTWW40P08000 Screw : 4mm x 8mm 32 AB 7-23 LX-BZA169WREZ Special screw 4 AC

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION

Order Parts from the authorized SHARP parts Distributor for your area. Defective parts requiring return should be returned as indicated in the Service Policy.

PACKING AND ACCESSORIES

DOOR PROTECTION SHEET SPADPA552WRE0

DOOR PAD SPADF0341WRE0

TOP PAD ASSEMBLY FPADBA313WRK0

WRAP COVER

BOTTOM PAD ASSEMBLY FPADBA314WRK0

6-2 MENU STICKER

6-1 INSTRUCTION MANUAL

PACKING CASE SPAKCD288WRE0

* Not replaceable items.

Page 46

R-25JT-F

OVEN AND CABINET PARTS

7-18

1-11

4-41

4-47

7-22

7-2

7-22

4-13

4-34

1-11

7-19

7-3

7-17

6-11

1-4

4-28

1-9

7-18

7-22

1-10

6-10

7-18

1-5

7-9

7-6

6-6

1-6

7-22

4-29

4-32

7-8

7-15

7-21

4-13

4-22

4-33

6-12

7-22

7-21

4-42

4-20

7-22

6-8

2-5-2

2-5-1

2-6

4-30

4-23

2-4

2-5

4-43

1-7

7-14

4-19

4-40

4-27

7-8

7-22

4-45

1-3

1-8

4-9

7-22

4-8

7-20

7-8

1-10

7-16

1-9

7-2

4-5

4-44

4-6

2-8

7-22

2-7

7-22

4-26

7-22

4-18

4-12

7-23

6-6

4-38

x-2

7-8

1-14

4-2

7-22

4-21

7-13

1-7

7-14

1-15

7-14

4-25

7-8

1-6

1-2

7-1

1-16

1-13

7-1

4-46

7-21

7-6

4-1

4-37

4-24

7-22

4-48

4-3

7-4

7-21

7-17

1-12

7-23

4-11

4-4

4-15

7-12

1-1

7-16

4-36

6-14

1-15

1-12

7-8

7-10

7-7

4-21

1-14

4-31

1-17

7-8

4-16

4-39

7-3

7-14

4-10

4-9

1-11

1-17

2-1

7-11

4-7

4-17

7-5

6-13

4-14

2-2

4-35

7-22

7-15

7-17

7-8

2-2

2-3

x2 both side

7-15

Page 47

R-25JT-F

CONTROL PANEL PARTS

6-15

3-2

3-2-3

3-2-2

3-1

3-5

3-4

3-6

3-3

DOOR PARTS

5-4

3-2-1

5-12

5-13

5-14

5-13

5-15

5-8

5-6

5-13

5-9

5-17

5-18

5-16

5-7

6-3

MISCELLANEOUS

5-6

5-10

5-3

5-19

5-20

5-11

5-10

5-13

5-2

6-4

5-5

To high voltage capacitor

To power transformer

6-9

6-7

Actual wire harness may be different from illustration.

6-5

6-16

Page 48

R-25JT-F

No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

Sharp R-25JT-F User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual