SHARP R8000G Service Manual

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Page 1

SERVICE MANUAL

COMMERCIAL

HIGH SPEED CONVECTION

MICROWAVE OVEN

R-8000G

SY313R8000GP/

MODEL

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 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..)

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 PERSONNEL ........................................................................................................................ 1

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

FOREWORD AND WARNING ....................................................................................................................................... 3

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

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

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

TROUBLESHOOTING GUIDE ..................................................................................................................................... 13

TEST PROCEDURE ..................................................................................................................................................... 15

TOUCH CONTROL PANEL .......................................................................................................................................... 25

PRECAUTIONS FOR USING LEAD-FREE SOLDER .................................................................................................. 29

PROCEDURE FOR CHECKING/ SETTING TOTAL OPERATION TIME .................................................................... 30

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

SERVICE MAINTENANCE CLEANING ....................................................................................................................... 39

PICTORIAL DIAGRAM ................................................................................................................................................. 40

POWER UNIT, CPU UNIT AND CONTROL UNIT CIRCUIT ........................................................................................ 41

GRID ASSIGNMENT OF FLUORESENT DISPLAY TUBE .......................................................................................... 42

PRINTED WIRING BOARD .......................................................................................................................................... 42

PARTS LIST ................................................................................................................................................................. 44

PACKING AND ACCESSORIES .................................................................................................................................. 47

R-8000G

Page

SHARP CORPORATION

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

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R-8000G

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.

generating 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 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.

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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-8000G

Before Servicing

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.

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

Whenever troubleshooting is performed the power supply must be disconnected. 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 high voltage capacitor.

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

5. Ensure that the leads remain isolated from other components and oven chassis by using 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 high voltage capacitor.

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 a microwave leakage test should be carried out.

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R-8000G

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/cm2, 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.

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SERVICE MANUAL

COMMERCIAL

HIGH SPEED CONVECTION

MICROWAVE OVEN

R-8000G

FOREWORD

R-8000G

PRODUCT DESCRIPTION

GENERAL INFORMATION

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP COOMERCIAL HIGH SPEED CONVECTION MICROWAVE OVEN, R-8000G.

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.

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.

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST

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

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R-8000G

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 208 Volts

9.0 Amperes (Microwave) / 14.0 Amperes (Convection)/ 16.0 Amperes (Speed Cooking) 60 Hertz / Single phase, 3 wire grounded

Power Output 1000 watts (IEC Test Procedure)

Operating frequency of 2450MHz

Top Heater Power Output 1500 Watts

Side Heater Power Output 1200 Watts

Case Dimensions Width 21-5/8" Height 16-1/2" Depth 24-1/4"

Cooking Cavity Dimensions Width 16-1/8" (1.1 Cubic Feet ) Height 8-3/8"

Depth 13-5/8"

Control Complement Touch Control System

Timer (0 - 99 min. 99 seconds) Microwave Power for Variable Cooking Repetition Rate;

100 PERCENT ......................................... Full power throughout the cooking time

90 PERCENT ............................................................approx. 90% of Full Power

80 PERCENT ............................................................approx. 80% of Full Power

70 PERCENT ............................................................approx. 70% of Full Power

60 PERCENT ............................................................approx. 60% of Full Power

50 PERCENT ............................................................approx. 50% of Full Power

40 PERCENT .............................................................approx. 40% of Full Power

30 PERCENT .............................................................approx. 30% of Full Power

20 PERCENT ............................................................approx. 20% of Full Power

10 PERCENT .............................................................approx. 10% of Full Power

0 PERCENT .......................................... No power throughout the cooking time

NOTE: Internal capacity is calculated by measuring maximum width,

depth and height. Actual capacity for holding food is less.

Oven temperature setting

100˚F, 150˚F, 275˚F, 300˚F, 325˚F, 375˚F, 400˚F, 425˚F, 450˚F

AUTOMATIC COOKING pads, SELECTA TIME pad, SELECTA POWER pad CUSTOM HELP pad, Number pads, OVEN READY ON/OFF pad, SELECTA PROGRAM pad SET pad, DOUBLE/TRIPLE QTY pad, START/MINUTES PLUS pad, STOP/CLEAR pad

Oven Cavity Light Yes

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. This oven is equipped with a cord having a grounding wire with a grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces risk of electric shock by providing an escape wire for the electric current.

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

Electrical Requirements

The electrical requirements are a 208 volt 60 Hz, AC only, 20 amp. or more protected electrical supply. It is recommended that a separate circuit serving only this appliance be provided. The 208 volt circuit is absolutely necessary for optimum cooking performance. The oven is equipped with a 3-prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded.

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R-8000G

Receptacle Box Cover

3-Pronged NEMA plug (6-20P)

3-Pronged, NEMA receptacle (6-20R)

11 10

Extension Cord

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 high speed oven. The marked rating of the extension cord should be AC 208 volt, 20 amp. or more. Be careful not to drape the cord over the countertop or table where it can be pulled on by children or tripped over accidentally.

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG.

OVEN DIAGRAM

1 Door handle

To open the door, pull the handle down and forward. Never hold the door handle when moving the oven.

2 Oven door with see-through window 3 Safety door latches

The oven will not operate unless the door is securely closed.

4 Door hinges 5 Door seals and sealing surfaces 6 Turntable motor shaft 7 Removable turntable support

Carefully place the turntable support in the center of the oven floor. After cooking, always clean the turntable support, especially around the rollers. These must be free from food splashes and grease. Built-up splashes or grease may overheat and cause arcing, begin to smoke or catch fire.

8 Removable turntable

Place the turntable on the turntable support securely. The turntable will rotate clockwise or counterclockwise. Only remove for cleaning.

9 Ventilation openings 10 Oven light

It will light when oven is operating or door is open.

11 Waveguide cover 12 Auto-Touch control panel 13 Time display: 99 minutes, 99

seconds

14 Convection air openings 15 Removable low rack 16 Removable high rack 17 Ventilation cover 18 Oven light access cover

TOUCH CONTROL PANEL

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R-8000G

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, secondary interlock switch and 3rd. latch switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 208 volts A.C. 60 Hz is supplied to the control unit. (Figure O-1).

1. The display will show " . ".

NOTE: When the door is opened, the oven lamp comes on.

MICROWAVE COOKING CONDITION

Press the SELECTA TIME pad. Program desired cooking time by touching the NUMBER pads and the power level pad by touching SELECTA POWER pad. When the START pad is touched, the following operations occur:

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

RELAY CONNECTED COMPONENTS

RY-1 Oven lamp/Turntable motor

RY-2 Power transformer

RY-5 Fan motor

2. 208 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the filament winding, and approximately 2300 volts A.C. 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 power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.

6. When the door is opened during a cook cycle, monitor switch, door sensing switch, relay (RY1), the primary interlock relay (RY2) and the secondary interlock switch are activated with the following results. The circuits to the turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation of the primary interlock relay (RY2) and the secondary interlock switch and is mechanically associated with the door so that it will function in the following sequence.

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

interlock relay (RY2), the secondary interlock switch and the 3rd. latch switch open their contacts. And contacts of the relay (RY1) remain closed. Then the monitor switch contacts close.

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

switch contacts first open and the 3rd. latch switch contacts close, and then the contacts of the secondary interlock switch close. And contacts of the relay (RY1) open.

If the primary interlock relay (RY2) and the secondary interlock switch fail with their contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, relay (RY1), primary interlock relay

(RY2) and the secondary interlock switch, causing the monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 208 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2). RY-2 is operated by the control unit within an varying time base. Microwave power operation is as follows:

VARI-MODE ON TIME OFF TIME

100 PERCENT (100% power) 32 sec. 0 sec.

90 PERCENT (approx. 90% power) 30 sec. 2 sec.

80 PERCENT (approx. 80% power) 26 sec. 6 sec. 70 PERCENT (approx. 70% power) 24 sec. 8 sec.

60 PERCENT (approx. 60% power) 22 sec. 10 sec.

50 PERCENT (approx. 50% power) 18 sec. 14 sec.

40 PERCENT (approx. 40% power) 16 sec. 16 sec.

30 PERCENT (approx. 30% power) 12 sec. 20 sec.

20 PERCENT (approx. 20% power) 8 sec. 24 sec.

10 PERCENT (approx. 10% power) 6 sec. 26 sec.

0 PERCENT (0% power) 0 sec. 32 sec.

NOTE: The ON/OFF time ratio does not correspond with the

percentage of microwave power, because approx. 3 seconds are needed for heating of the magnetron filament.

EXPRESS DEFROST COOKING

This is the multiple sequence cooking composed of low microwave power.

NORMAL CONVECTION COOKING CONDITION

Touch SELECTA PROGRAM pad 3 times. Then touch SET pad. Program desired oven temperature by touching the SET pad. Enter cooking time by touching number pads. When the START pad is touched, the following operations occur: (Figure O-3)

1. The coil of shut-off relays (RY1, RY3 and RY5) are energized, the oven lamp, cooling fan motor, turntable motor and jet motor are turned on.

2. The solid-state relays are energized by the control unit and the main supply voltage is applied to the top and side heating elements.

3. When the oven temperature reaches the selected preheat temperature, the following operations occur: 3-1 The solid-state relays are de-energized by the control unit

temperature circuit and thermistor, opening the circuit to the heating elements.

3-2 The oven will continue to function for 30 minutes, turning

the heating elements on and off, as needed to maintain the selected preheat temperature. The oven will shutdown completely after 30 minutes

4. Open the door and place food in the oven. Close door. Touch the START pad. (Figure O-3)

5. The numbers on the digital read-out start to count down to zero.

6. The oven lamp, turntable motor, cooling fan motor and jet motor are energized.

Page 9

R-8000G

JET MOTOR

THERMISTOR

Sensing

Voltage

OFF

023283132 (sec.) 64 (sec.)

3 sec.

Sensing the voltage across temperature measurement circuit.

3 sec.

7. The solid-state relays are energized (if the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the heating elements to return to the selected cooking temperature.

8. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and jet motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 230˚F, the circuit to RY5 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 195˚F, at which time the relay will be de-energized, turning off the fan motor. Relay RY3 will however, open as soon as the convection cycle has ended, turning off the convection fan motor.

SPEED BAKE COOKING

Touch SELECTA PROGRAM pad 8 times and touch SET pad. Then touch SET pad to select desired temperature. Enter cooking time. When the START pad is touched, the following operations occur: (Figure O-3)

1. The contacts of the relays RY1, RY3 and RY5 are closed, and the oven lamp, turntable motor, jet motor and fan motors are energized.

NOTE : The rotate direction of the jet motor is the same as one of

the convection cooking.

2. The solid-state relays are energized and the main supply voltage is applied to the top and side heating elements.

NOTE : After cooking, the operation of the fan motors is the

same as one of the convection cooking.

HIGH SPEED GRILL/ SPEED GRILL COOKING

Touch SELECTA PROGRAM pad 6 times and touch SET pad. Enter cooking time. When the START pad is touched, the following operations occur: (Figure O-4)

1. The contacts of the relays RY1, RY3, RY5 and RY6 are closed, and the oven lamp, turntable motor, jet motor and fan motors are energized.

NOTE : The rotate direction of the jet motor is reverse to one

of the convection cooking by the relay RY6.

2. The solid-state relays are energized and the main supply voltage is applied to the top and side heating elements.

NOTE : After cooking, the operation of the fan motors is the

same as one of the convection cooking.

AUTOMATIC COOKING

Automatic cooking will automatically compute the oven temperature, microwave power and cooking time. And the oven will cook according to the special cooking sequence.

FIRE SENSING FEATURE (MICROWAVE MODE)

This model incorporates a sensing feature which will stop the oven's operation if there is a fire in the oven cavity during microwave cooking. This fire sensing feature will operate when the microwave power level is set to 80% or more. This is accomplished by the LSI repeatedly measuring the voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base comparing the obtained voltage measurements. If the most recent voltage measured is 300 mV greater than the previous voltage measured, the LSI judges it as a fire in the oven cavity and switches off the relays to the power transformer, fan motor and jet motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity. Please refer to the following section for a more detailed description.

Operation

Please refer to the timing diagrams below.

1. The fire sensing will start after 5 minutes when the oven is started.

2. The thermistor operates within a 32-seconds time base and it is energized for three (3) seconds and off for 29 seconds. Two (2) seconds after the thermistor is energized, the voltage across the temperature measurement circuit is sampled by the LSI and twenty five (25) seconds after the thermistor is cut off the LSI turns on the convection fan for three (3) seconds.

3. The above procedure is repeated. If the difference between the first voltage measured (in step 1) and the voltage measured when the procedure is repeated (step 2) is greater than 300 mV the LSI makes the judgment that there is a fire in the oven cavity and will switch off the relays to the power transformer, fan motor and jet motor. The LSI also stops counting down and closes the damper door so that no fresh air will enter the oven cavity.

4. Once the fire sensor feature has shut the unit down, the programmed cooking cycle may be resumed by pressing the "START" pad or the unit may be reset by pressing the "CLEAR" pad.

HIGH SPEED GRILL WITH MICRO/ SPEED GRILL WITH MICRO/ SPEED ROAST COOKING

Touch SELECTA PROGRAM pad 9 times and touch SET pad. Then touch SET pad to select desired temperature. Enter cooking time. When the START pad is touched, the following operations occur: (Figure O-5)

1. The contacts of the relays RY1, RY3 and RY5 are closed, and the oven lamp, turntable motor, jet motor and fan motors are energized.

NOTE : The rotate direction of the jet motor is the same as one

of the convection cooking for the first time. But for the last 15 minutes, the direction is reverse by the relay

2. The solid-state relays and relay RY2 are energized alternately, and the main supply voltage is applied to the top and side heating elements and the power transformer alternately.

NOTE : After cooking, the operation of the fan motors is the

RY6.

same as one of the convection cooking.

FAN MOTOR OPERATION

After cooking is completed, the fan motors will continue for 1 minute. At the end of the cooking cycle, if the cavity air temperature is above 230˚F, the circuit to RY5 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 195˚F, at which time the relay will be deenergized, turning off the fan motor.

Page 10

R-8000G

SCHEMATIC DIAGRAM

NOTE: CONDITION OF OVEN

SCHEMATIC

1. DOOR CLOSED.

2. . APPEARS ON DISPLAY.

NOISE FILTER

BLK

MONITOR FUSE 20A

60Hz

208V

RESISTO 10MΩ 1/2W

LINE BYPASS CAPACITOR

0.0033 µF 250V

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

LINE BYPASS CAPACITOR

WHT GRY

0.0033 µF 250V

RED

T/C TRANSFORMER

A8 A6 A4 A3 A2E1A1 D9

CONTROL UNIT

B3 B4

DOOR

SENSING

SWITCH

THER-

MISTOR

Figure O-1. Oven Schematic-OFF Condition

NOTE: " " indicates components with potential above 250V.

MAGNETRON TEMPERATURE FUSE 150˚C

TOP HEATER THERMAL CUT-OUT 170˚C

RY6

D7D1

D5 D3

JET MOTOR CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

COM.

RY3

JET MOTOR

SIDE HEATER THERMAL CUT-OUT 150˚C

COM.

RY5

COM.

RY1

N.O.

FAN MOTOR

N.O.

PRIMARY

INTERLOCK RELAY

RY2

COM.

OVEN LAMP

SOLID-STATE RELAY

TTM

TURNTABLE MOTOR

FUSE F10A

POWER TRANSFORMER

SIDE HEATIMG ELEMENT

TOP HEATIMG ELEMENT

MONITOR SWITCH

WITH 160˚C THERMOSTAT

IN PRIMARY WINDING

CAPACITOR 1µ AC 2300V

H.V. RECTIFIER

MAGNETRON

SCHEMATIC (MICROWAVE TIME COOKING)

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. "SELECTA TIME" PAD TOUCHED.

3. COOKING TIME PROGRAMMED.

4. "START" PAD TOUCHED.

NOISE FILTER

BLK

MONITOR FUSE 20A

60Hz

208V

RESISTO 10MΩ 1/2W

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

WHT GRY

RED

A8 A6 A4 A3 A2E1A1 D9

LINE BYPASS CAPACITOR

0.0033 µF 250V

LINE BYPASS CAPACITOR

0.0033 µF 250V

T/C TRANSFORMER

B3 B4

DOOR

SENSING

SWITCH

CONTROL UNIT

D7D1

THER-

MISTOR

NOTE: CONDITION OF OVEN

SCHEMATIC (EXPRESS DEFROST)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED TWICE.

3. "SET" PAD TOUCHED.

4. FOOD WEIGHT ENTERED.

5. "START" PAD TOUCHED.

MAGNETRON TEMPERATURE FUSE 150˚C

TOP HEATER THERMAL CUT-OUT 170˚C

RY6

D5 D3

JET MOTOR CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

COM.

RY3

JET MOTOR

SIDE HEATER THERMAL CUT-OUT 150˚C

COM.

RY5

COM.

RY1

N.O.

FAN MOTOR

N.O.

PRIMARY

INTERLOCK RELAY

RY2

COM.

OVEN LAMP

SOLID-STATE RELAY

TTM

TURNTABLE MOTOR

FUSE F10A

POWER TRANSFORMER

TOP HEATIMG ELEMENT

SIDE HEATIMG ELEMENT

MONITOR SWITCH

WITH 160˚C THERMOSTAT

IN PRIMARY WINDING

CAPACITOR 1µ AC 2300V

H.V. RECTIFIER

MAGNETRON

Figure O-2. Oven Schematic-Microwave or Express Defrost Cooking Condition

Page 11

R-8000G

NOTE: CONDITION OF OVEN

SCHEMATIC (CONVECTION)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 3 TIMES.

3. "SET" PAD TOUCHED.

4. DESIRED TEMPERATURE SELECTED WITH "SET" PAD.

5. COOKING TIME PROGRAMMED.

6. "START" PAD TOUCHED.

NOISE FILTER

BLK

MONITOR FUSE 20A

60Hz

208V

RESISTO 10MΩ 1/2W

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

WHT GRY

RED

T/C TRANSFORMER

A8 A6 A4 A3 A2E1A1 D9

LINE BYPASS CAPACITOR

0.0033 µF 250V

DOOR

SENSING

SWITCH

LINE BYPASS CAPACITOR

0.0033 µF 250V

CONTROL UNIT

B3 B4

THER-

MISTOR

MAGNETRON TEMPERATURE FUSE 150˚C

TOP HEATER THERMAL CUT-OUT 170˚C

RY6

D7D1

D5 D3

JET MOTOR

JET MOTOR CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

NOTE: CONDITION OF OVEN

SCHEMATIC (SPEED BAKE)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 8 TIMES.

3. "SET" PAD TOUCHED.

4. DESIRED TEMPERATURE SELECTED WITH "SET" PAD.

5. COOKING TIME PROGRAMMED.

6. "START" PAD TOUCHED.

FUSE

SIDE HEATER THERMAL CUT-OUT 150˚C

COM.

RY5

RY3

COM.

RY1

N.O.

FAN MOTOR

N.O.

PRIMARY

INTERLOCK RELAY

RY2

COM.

OVEN LAMP

SOLID-STATE RELAY

TTM

TURNTABLE MOTOR

F10A

POWER TRANSFORMER

TOP HEATIMG ELEMENT

SIDE HEATIMG ELEMENT

MONITOR SWITCH

WITH 160˚C THERMOSTAT

IN PRIMARY WINDING

CAPACITOR 1µ AC 2300V

MAGNETRON

H.V. RECTIFIER

Figure O-3. Oven Schematic-Normal Convection or Speed Bake Cooking Condition

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 4 TIMES.

3. "SET" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. "START" PAD TOUCHED.

BLK

60Hz

208V

WHT GRY

SCHEMATIC (HIGH SPEED GRILL)

NOISE FILTER

MONITOR FUSE 20A

RESISTO 10MΩ 1/2W

LINE BYPASS CAPACITOR

0.0033 µF 250V

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

LINE BYPASS CAPACITOR

0.0033 µF 250V

RED

T/C TRANSFORMER

A8 A6 A4 A3 A2E1A1 D9

CONTROL UNIT

B3 B4

DOOR

SENSING

SWITCH

THER-

MISTOR

NOTE: CONDITION OF OVEN

SCHEMATIC (SPEED GRILL)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 6 TIMES.

3. "SET" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. "START" PAD TOUCHED.

MAGNETRON TEMPERATURE FUSE 150˚C

TOP HEATER THERMAL CUT-OUT 170˚C

RY6

D7D1

D5 D3

JET MOTOR CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

COM.

RY3

JET MOTOR

SIDE HEATER THERMAL CUT-OUT 150˚C

COM.

RY5

COM.

RY1

N.O.

FAN MOTOR

N.O.

PRIMARY

INTERLOCK RELAY

RY2

COM.

OVEN LAMP

SOLID-STATE RELAY

TTM

TURNTABLE MOTOR

FUSE F10A

POWER TRANSFORMER

SIDE HEATIMG ELEMENT

TOP HEATIMG ELEMENT

MONITOR SWITCH

WITH 160˚C THERMOSTAT

IN PRIMARY WINDING

CAPACITOR 1µ AC 2300V

H.V. RECTIFIER

MAGNETRON

Figure O-4. Oven Schematic-High Speed Grill or Speed Grill Cooking Condition

Page 12

R-8000G

NOTE: CONDITION OF OVEN

SCHEMATIC (HIGH SPEED GRILL WITH MICRO)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 5 TIMES.

3. "SET" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. POWER LEVEL PROGRAMMED WITH "SELECTA POWER" PAD.

6. "START" PAD TOUCHED.

SCHEMATIC (SPEED ROAST)

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 9 TIMES.

3. "SET" PAD TOUCHED.

4. DESIRED TEMPERATURE SELECTED WITH "SET" PAD.

5. COOKING TIME PROGRAMMED.

6. "START" PAD TOUCHED.

NOTE: The contacts of relay RY6 will contact D3 at the 1st.

stage only.

NOISE FILTER

BLK

MONITOR FUSE 20A

60Hz

208V

RESISTO 10MΩ 1/2W

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

WHT GRY

RED

T/C TRANSFORMER

A8 A6 A4 A3 A2E1A1 D9

LINE BYPASS CAPACITOR

0.0033 µF 250V

DOOR

SENSING

SWITCH

LINE BYPASS CAPACITOR

0.0033 µF 250V

CONTROL UNIT

B3 B4

THER-

MISTOR

TOP HEATER THERMAL CUT-OUT 170˚C

RY6

D7D1

D5 D3

JET MOTOR CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

NOTE: CONDITION OF OVEN

SCHEMATIC (HIGH SPEED GRILL WITH MICRO)

1. DOOR CLOSED.

2. "SELECTA PROGRAM" PAD TOUCHED 7 TIMES.

3. "SET" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. POWER LEVEL PROGRAMMED WITH "SELECTA POWER" PAD.

6. "START" PAD TOUCHED.

NOTE: " " indicates components with potential above 250V.

MAGNETRON TEMPERATURE FUSE 150˚C

JET MOTOR

SIDE HEATER THERMAL CUT-OUT 150˚C

COM.

RY3

RY5

COM.

RY1

N.O.

FAN MOTOR

N.O.

PRIMARY

INTERLOCK RELAY

RY2

COM.

OVEN LAMP

SOLID-STATE RELAY

TTM

TURNTABLE MOTOR

FUSE F10A

POWER TRANSFORMER

SIDE HEATIMG ELEMENT

TOP HEATIMG ELEMENT

MONITOR SWITCH

WITH 160˚C THERMOSTAT

IN PRIMARY WINDING

CAPACITOR 1µ AC 2300V

MAGNETRON

H.V. RECTIFIER

Figure O-5. Oven Schematic-High Speed Grill with Micro, Speed Grill with Micro or Speed Roast Cooking Condition

Page 13

DESCRIPTION AND FUNCTION OF COMPONENTS

R-8000G

DOOR OPEN MECHANISM

The door is opened by pulling the door handle down and forward, referring to the figure D-1. When the door handle is pulled down, the latch heads are moved upward. And then when the door handle is pulled forward, the latch heads are released from the latch hooks right and left. Now, the door will open.

Monitor switch

Latch hook left

Latch head

Figure D-1. Door Open Mechanism

Secondary interlock switch

Latch hook right

Latch head

3rd. latch switch

Door sensing switch

DOOR SENSING AND SECONDARY INTERLOCK SWITCHES

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

MONITOR SWITCH

The monitor switch is mounted on the upper position of latch hook left. It is activated (the contacts opened) by the left latch head while the door is closed. The switch is intended to render the oven inoperative by means of blowing the monitor fuse when the contacts of the primary interlock relay and secondary interlock switch fail to open when the door is opened.

Functions:

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

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

3. If the door is opened, and the primary interlock relay and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE

TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

3RD. LATCH SWITCH

The 3rd. latch switch is mounted on the upper position of the latch hook right. When the oven door is opened, the switch interrupt the circuit to the top and side heating elements.

THERMISTOR

The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the heater relay to operate, thus the current to the heating elements is turned ON/ OFF. If the convection cooking or some cooking modes which use the top / side heating elements is started and the oven temperature does not rise above 100˚F (37.8˚C), the control unit will stop the oven after 10 minutes. In this case, the thermistor may be opened.

MAGNETRON TEMPERATURE FUSE.

The temperature fuse located on the waveguide flange is designed to prevent damage to the magnetron if an over heated condition develops in the magnetron due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the magnetron, the temperature fuse will open at 302˚F(150˚C) causing the oven to shut down.

TOP HEATER THERMAL CUT-OUT

The thermal cut-out located on the thermal cover upper is designed to prevent damage to the top heating element unit if an over heated condition develops in the top heating element unit due to convection fan failure, thermistor failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperature are reached within the top heating element unit, the thermal cut-out will open at 338˚F (170˚C) causing the oven to shut down. When the thermal cut-out has cooled, the thermal cut-out closes at 311˚F(155˚C).

SIDE HEATER THERMAL CUT-OUT

The thermal cut-out located on the thermal cover left is designed to prevent damage to the side heating element unit if an over heated condition develops in the side heating element unit due to convection fan failure, thermistor failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperature are reached within the side heating element unit, the thermal cut-out will open at 302˚F (150˚C) causing the oven to shut down. When the thermal cut-out has cooled, the thermal cut-out closes at 266˚F (130˚C).

TOP HEATING ELEMENT

The top heating element is located at the top of the oven cavity. It is intended to heat air driven by the convection fan.

Page 14

R-8000G

Hot air

Convection fan

Hot air

Oven cavity left side

Oven cavity top wall

Side heating element unit

Top heating element unit

Turntable

Convection Mode JET Mode

The heated air is kept in the oven and force-circulated and reheated by the top heating element.

SIDE HEATING ELEMENT

The side heating element is located at the left side of the oven cavity. It is intended to heat air driven by the convection fan. The heated air is kept in the oven and force-circulated and reheated by the top heating element.

TURNTABLE MOTOR

The turntable motor rotates the turntable located in the bottom of the oven cavity, so that the food on the turntable is cooked evenly during cooking. The turntable may turn in either direction.

FAN MOTOR (MAGNETRON SIDE)

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

FAN MOTOR (POWER TRANSFORMER SIDE)

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

Top heating element unit

Side heating element unit

Convection fan

Convection mode

FRONT VIEW

JET mode

Figure D-2. Rotation direction of convection fan

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the heating element, but is heated by forced circulation of the hot air produced by the heating elements. The air heated by the heating elements is circulated through the convection passage provided on the outer casing of the oven cavity by means of the convection fan which is driven by the jet motor. It then enters the inside of the oven through the vent holes provided on the top and left sides of the oven. Next, the hot air heats the food on the turntable and leaves the oven cavity through the vent in the center of the oven cavity back side wall. Without leaving the oven, this hot air is reheated by the heating elements, passes through the convection passage and enters the inside of the oven cavity again, in a continuing cycle. In this way, the hot air circulates inside the oven cavity to raise its temperature and, at the same time, comes into contact with the food being cooked. When the temperature inside the oven cavity reaches the selected temperature, the heating elements are de-energized. When the temperature inside the oven cavity drops below the selected temperature, the heating elements are energized again. In this way, the inside of the oven cavity is maintained at approximately the selected temperature. When the convection time reaches 0, the heating elements are de-energized and the convection fan stops operating and the oven shuts off.

Flow of hot air:

The rotation direction of the jet motor is controlled by relay RY6. When the convection fan rotates clockwise, the hot air from the oven cavity left side wall blows stronger than one from the oven cavity top wall. ( This mode is called “Convection mode”.) When the convection fan rotates counterclockwise, the hot air from the oven cavity top wall blows stronger than one from the oven cavity left side wall. (This mode is called “JET mode”.)

Figure D-3. Flow of hot air

Page 15

R-8000G

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 switch, relay (RY1) primary interlock

relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA033WRKZ 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

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Remove the back plate from the oven, referring to "BACK PLATE REMOVAL".

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

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

8. 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 high voltage capacitor.

4. Reconnect all leads removed from components during testing.

5. Reinstall the outer case (cabinet) and theback plate.

6. Reconnect the power supply cord after the outer case and the back plate are installed.

7. Run the oven and check all functions.

Page 16

R-8000G

TEST PROCEDURE

POSSIBLE CASE AND

DEFECTIVE PARTS

CONDITION OFF CONDITION COOKING CONDITION MICROWAVE COOKING ERROR MODE

ABCDEEFGHJKMOSTUVVVVVXYWW

RE: Replace / CK: Check

RE RERE RERECK CKCKCK CK

PLNUIP

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.

Oven lamp does not light with door opened.

Oven lamp does not light in cook cycle. (It light when door is opened).

Oven lamp light, but turntable motor does not operate.

Tu r ntable motor operates normally but cooling fan motor does not operate.

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

Low or no power is produced during microwave cooking (The food is heated incompletely or not heated at all)

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

Function of variable cooking does not operate properly except 100% power.

Function of EXPRESS DEFROST does not operate properly.

EXCEPT FOR

MICROWAVE

Heating elements do not heat.

COOKING

Temperature in the oven cavity is lower or higher than preset.

Jet motor does not operate at all or properly.

Oven operates for 10 minutes then shuts down, and "THERMISTOR FAILURE" appears.

"MEMORY FAILURE" appears. "MAXIMUM TIME EXCEEDED" ap-

pears. "CHECK 1" appears. (Total opera-

tion time (hours) of magnetron exceeds 1250 hours.)

"CHECK 2" appears. (Total operation time (hours) of top heating element exceeds 4000 hours.)

"CHECK 3" appears. (Total operation time (hours) of side heating element exceeds 4000 hours.)

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

SECONDARY INTERLOCK SWITCH

3RD. LATCH SWITCH

PRIMARY INTERLOCK SYSTEM

MONITOR SWITCH

MONITOR FUSE 20A

MAGNETRON TEMPERATURE FUSE

THERMAL CUT-OUT (TOP)

TOP HEATING ELEMENT

THERMISTOR

NOISE FILTER

TOUCH CONTROL PANEL

TACT SWITCH

RELAY RY-1

RELAY RY-2

RELAY RY-3

RELAY RY-5

RELAY RY-6

EXPRESS DEFROST

FUSE1 ON PWB.

SOLID-STATE RELAY (TOP)

SOLID-STATE RELAY (SIDE)

OVEN LAMP

FAN MOTOR (MAGNETRON)

TURNTABLE MOTOR

JET MOTOR

LOOSE WIRING

SHORTED IN POWER CORD

NO POWER AT OUTLET

LOW VOLTAGE

THERMAL CUT OUT (SIDE)

SIDE HEATING ELEMENT

FAN MOTOR (POWER TRANSFORMER)

T/C TRANSFORMER

FUSE F10A

JET MOTOR CAPACITOR

WRONG OPERATION

MISADUSTMENT SWITCH

Page 17

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. 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.

7. 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.

8. Reconnect all leads removed from components during testing.

9. Reinstall the outer case (cabinet).

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

11.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:

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 HIGH POWER (100%) 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 29.5 to

54.9˚F(16.4 to 30.5˚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 240 volts and the oven cavity is clean.

R-8000G

TEST PROCEDURES

COMPONENT TEST

B POWER TRANSFORMER TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. 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 approximately 0.9 ohms and the resistance of the high voltage coil should be approximately 67 ohms; the resistance of the filament coil should be less than 1 ohm.

7. Also, the power transformer has the thermostat in the primary coil. Measure the resistance of the primary coil. The resistance of the primary coil should be above resistance unless the temperature of the thermostat in the primary coil reaches approximately 320˚F (160˚C). The thermostat resets automatically at 221˚F(105˚C). If an ohmmeter indicates an open circuit under normal condition, replace the power

Page 18

R-8000G

PROCEDURE

LETTER

C HIGH VOLTAGE RECTIFIER TEST

TEST PROCEDURES

COMPONENT TEST

transformer because the primary coil (thermostat) has opened. An open primary coil (thermostat) indicates overheating of the power transformer. Check for restricted air flow to the power transformer, especially the fan motor (power transformer side).

8. Reconnect all leads removed from components during testing.

9. Reinstall the outer case (cabinet) and the back plate.

10.Reconnect the power supply cord after the outer case and the back plate are installed.

11.Run the oven and check all functions.

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

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. 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.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet) and back plate.

9. Reconnect the power supply cord after the outer case and the back plate are installed.

10.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 TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate 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.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet) and the back plate.

9. Reconnect the power supply cord after the outer case and the back plate are installed.

10.Run the oven and check all functions.

E SECONDARY INTERLOCK SWITCH/ 3RD. LATCH SWITCH TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. 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 switch.

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.

Page 19

PROCEDURE

LETTER

F PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

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.

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

motor and oven light will be activated by RY1.

PRIMARY INTERLOCK RELAY (RY2)

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay (RY2). 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.

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.

8. Run the oven and check all functions.

R-8000G

TEST PROCEDURES

COMPONENT TEST

G MONITOR SWITCH

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

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

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.

Monitor switch

Screw driver

WHT

GRY

BLK

OHMMETER

Latch hook left

Secondary interlock switch

Page 20

R-8000G

PROCEDURE

LETTER

H BLOWN MONITOR FUSE

TEST PROCEDURES

COMPONENT TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. If the monitor fuse is blown when the door is opened, check the RY1, primary interlock relay (RY2), secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE RELAY RY1, PRIMARY INTERLOCK

RELAY (RY2), SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR SWITCH 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.

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.

I BLOWN FUSE F10A

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. If the monitor fuse is blown, there could be short or ground in high voltage rectifier, magnetron, power transformer, high voltage capacitor or high voltage wire. Check them and replace the defective parts or repair the wire harness.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet) and the back plate.

7. Reconnect the power supply cord after the outer case and back plate are installed.

8. Run the oven and check all functions.

CAUTION: ONLY REPLACE FUSE F10A WITH CORRECT VALUE REPLACEMENT.

J MAGNETRON TEMPERATURE FUSE TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron reaches approximately 302˚F(150˚C). An open temperature fuse indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling duct and cooling fan.

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.

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

REPLACE TEMPERATURE FUSE.

K THERMAL CUT-OUT (TOP HEATER) TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the

Page 21

TEST PROCEDURES

PROCEDURE

LETTER

temperature of the thermal cut-out reaches approximately 338˚F(170˚C). The thermal cut-out resets automatically at approximately 311˚F(155˚C). If thermal cut-out has opened under normal condition, replace the same item as in the parts list. An open thermal cut-out indicates overheating of the top heating element unit. Check for restricted air flow to the top heat element unit through the vent holes of the oven cavity, especially the heater duct upper and convection fan.

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.

CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, RE-

PLACE THERMAL CUT-OUT.

L THERMAL CUT-OUT (SIDE HEATER) TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 302˚F(150˚C). The thermal cut-out resets automatically at approximately 266˚F(130˚C). If thermal cut-out has opened under normal condition, replace the same item as in the parts list. An open thermal cut-out indicates overheating of the side heating element unit. Check for restricted air flow to the side heat element unit through the vent holes of the oven cavity, especially the heater duct left and convection fan.

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.

CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, RE-

PLACE THERMAL CUT-OUT.

R-8000G

COMPONENT TEST

M TOP HEATING ELEMENT TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Make sure the heating element is fully cooled and test as follows; a. Disconnect wire leads from the heating element and measure the resistance with an ohmmeter. On the R

x 1 scale, the resistance between the heating element terminals should be approximately 27.8Ω.

b. Disconnect wire leads from the heating element and measure the insulation resistance with 500V -

100MΩ insulation resistance meter. The insulation resistance between heating element terminal and cavity should be more than 0.5MΩ.

6. If the meter does not indicate above resistance, replace the top heating element.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet).

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

10.Run the oven and check all functions.

N SIDE HEATING ELEMENT TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Make sure the heating element is fully cooled and test as follows; a. Disconnect wire leads from the heating element and measure the resistance with an ohmmeter. On the R x 1 scale,

the resistance between the heating element terminals should be approximately 35 Ω.

Page 22

R-8000G

PROCEDURE

LETTER

O THERMISTOR TEST

TEST PROCEDURES

COMPONENT TEST

b. Disconnect wire leads from the heating element and measure the insulation resistance with 500V -

100MΩ insulation resistance meter. The insulation resistance between heating element terminal and cavity should be more than 0.5MΩ.

6. If the meter does not indicate above resistance, replace the top heating element.

7. Reconnect all leads removed from components during testing.

8. Reinstall the outer case (cabinet).

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

10.Run the oven and check all functions.

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s E-5 and E-6.

Room Temperature Resistance

68˚F(20˚C) - 86˚F(30˚C) Approx. 360 kΩ - 152 KΩ

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

8. Reconnect all leads removed from components during testing.

9. Reinstall the outer case (cabinet).

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

11.Run the oven and check all functions.

P JET MOTOR CAPACITOR TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Disconnect input leads and check for short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the 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 the terminals. If it is shorted, replace the capacitor.

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet) and the back plate.

8. Reconnect the power supply cord after the outer case and the back plate are installed.

9. Run the oven and check all functions.

Q JET MOTOR TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

5. Disconnect the 3-pin connector of the jet motor from the main wire harness.

6. Measure the resistance of the jet motor with an ohmmeter. The resistance of the main coil, across the black and the red wires, should be approximately 100 ohms. The resistance of the sub coil, across the black and the white wires, should be approximately 110 ohms.

7. Also, the jet motor has the thermal cut-out in it. Measure the resistance of the main coil (or the sub coil). The resistance across the black and the red wires (or across the black and the white wires) should be above resistance unless the temperature of the thermal cut-out reaches approximately 266˚F (130˚C). The thermal cut-out resets automatically at 212˚F (100˚C). If an ohmmeter indicates an open circuit under normal condition, replace the jet motor because the thermal cut-out has opened. An open thermal cut-out indicates overheating of the jet motor. Check for restricted air flow to the jet motor or a lock of the convection fan, especially the fan motor (power transformer side).

Page 23

PROCEDURE

NOISE SUPRESSION COIL

LINE CROSS CAPACITOR 1.0µF 275V

RESISTO 680kΩ 1/2W

RESISTO 10MΩ 1/2W

LINE BYPASS CAPACITOR

0.0033 µF 250V

LINE BYPASS CAPACITOR

0.0033 µF 250V

MONITOR FUSE 20A

BLK

WHT GRY

RED

LETTER

R-8000G

TEST PROCEDURES

COMPONENT TEST

8. Reconnect all leads removed from components during testing.

9. Reinstall the outer case (cabinet) and the back plate.

10. Reconnect the power supply cord after the outer

Thermal

Cut-out

case and the back plate are installed.

11. Run the oven and check all functions.

130˚C OFF 100˚C ON

R CHECKING TEMPERATURE IN THE CONVECTION MODE

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

It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate. The temperature should be checked with outer case cabinet installed, approx. 5 minutes after preheat temperature is reached (audible signal sounds four times). The temperature experienced may be approx. 30˚F more or less than indicated on the display, however, in most cases the food cooking results will be satisfactory. Difference in power supply voltage will also affect the oven temperature. The Household power supply voltage may sometimes become lower than the rated voltage (240 V) and cause under-cooking. If the power supply voltage is 10% lower than the rated voltage, longer cooking time is required by 10% to 20%.

S NOISE FILTER TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. 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.

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.

Main Coil

100Ω

110Ω

Sub Coil

JET MOTOR

3-pin Connector

BLU RED

WHT

T TOUCH CONTROL PANEL ASSEMBLY TEST

MEASURING POINT INDICATION OF OHMMETER

Between L and L Approx. 680 kΩ

Between terminal L and RED Short circuit.

Between terminal L and GRY Short circuit.

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, troubleshooting by unit replacement is described according to the symptoms indicated.

Before testing,

1) Disconnect the power supply cord.

2) Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3) Open the door and block it open.

4) Discharge high voltage capacitor.

5) Disconnect the leads to the primary of the power transformer.

6) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

Page 24

R-8000G

PROCEDURE

LETTER

TEST PROCEDURES

COMPONENT TEST

1. Tact switches on the CPU unit or the control unit (switch unit)

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

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

3) Run the oven and check all functions. The following symptoms indicate a defective tact switch.

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 tact switch is defective.

1) Disconnect the power supply cord.

2) Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3) Open the door and block it open.

4) Discharge high voltage capacitor.

5) Check which tact switch is defective, one on the CPU unit or one on the control unit (switch unit), referring to "TACT SWITCH TEST". (Procedure U)

6) Replace the unit that has a defective tact switch.

7) Reconnect all leads removed from components during testing.

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

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

10)Run the oven and check all functions.

2. CPU Unit The following symptoms indicate a defective CPU unit. Reconnect the power supply cord. And check for followings.

2-1 In connection with indicators

a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f )A certain group of indicators do not light up. g) The figure of all digits flicker.

2-2 Other possible problems caused by defective CPU unit.

a) Cooking is not possible.

3. Other possible problems caused by defective control unit (switch unit). a) Buzzer does not sound or continues to sound.

4. Other possible problems caused by defective power unit. a) Cooking is not possible. b) Electrical parts do not operate. c) Oven or electrical parts do not stop.

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 high voltage capacitor.

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.

U TACT SWITCH TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Remove the CPU unit and the control unit (switch unit), referring to "CONTROL PANEL ASSEMBLY, CPU UNIT AND CONTROL UNIT REMOVAL".

6. By using an ohmmeter, check the tact switch operation.

7. When the tact switch is not depressed, an ohmmeter should indicate an open circuit. When the tact switch is depressed, an ohmmeter should indicate a short circuit. If improper operation is indicated, the tact switch is probably defective.

8. Refer to the switch unit matrix, and judge which unit has any defective tact switches.

Page 25

PROCEDURE

LETTER

9. Replace the CPU unit or the control unit that has any

10. Assemble the control panel and reinstall it to the

11. Reconnect all leads removed from components

12. Reinstall the outer case cabinet.

13. Reconnect the power supply cord after the outer

14. Run the oven and check all functions.

V RELAY TEST

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

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

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

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

8. Remove the outer case and check voltage between Pin Nos. 1 and 9 of the 5 pin connector (CN-D) on the control

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

10. Open the door and block it open.

11. Discharge high voltage capacitor.

12. Reconnect all leads removed from components during testing.

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

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

15. Run the oven and check all functions.

R-8000G

TEST PROCEDURES

COMPONENT TEST

defective tact switches.

oven.

during testing.

case is installed.

(SW12)

(SW16)

(SW13) (SW14)

2 127

(SW17)

OVEN READY

ON/OFF

SP1

R11

(SW11)

(SW15)

3.3K 1/4W

R10

(SW19)

(SW23)

START

MINUTEPLUS

1.5K 1/4W

3 138

SW11-23

(SW18)

(SW22)(SW21)(SW20)

STOP

CLEAR

CN-J

WH-A

S10B-PH

10Pin

J6J3J5J4J2

J10

(SW1)

CONVENIENCE APPETIZERS

& SNACKS

(SW4)

BASIC COOK

(SW7)

SELECTA

PROGRAM

(SW10)

SET

(SW2)

BAKED

GOODS

(SW5)

SELECTA

TIME

(SW8)

CUSTOM

HELP

SW1-10

(SW3)

CONVENIENCE

MEAT, FISH

& POULTRY

(SW6)

SELECTA

POWER

(SW9)

DOUBLE/

TRIPLEQTY

unit with an A.C. voltmeter. The meter should indicate 208 volts, if not check oven circuit. Shut-off, Cook and Heater Relays 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, high speed grill or normal convection cooking condition.

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

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

control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 Approx. 27.0V D.C. Oven lamp / Turntable motor RY2 (COOK) Approx. 25.0V D.C. Power transformer RY3 Approx. 25.0V D.C. Jet motor RY5 Approx. 25.0V D.C. Fan motors RY6 Approx. 25.0V D.C. Jet motor capacitor

W SOLID-STATE RELAY TEST

1. Disconnect the power supply.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

5. Disconnect the wire leads from the solid-state relay.

6. Measure the resistance between the terminals as described in the following table, with an ohmmeter.

Terminals Resistance Between 1 and 2 Approx. 50MΩ Between 3 and 4 Approx. 1.3MΩ

7. If the meter does not indicate above resistance, replace the solid-state relay.

8. Reconnect all leads removed from components during testing.

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

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

11. Run the oven and check all functions.

Solid-state relay

Page 26

R-8000G

PROCEDURE

LETTER

X EXPRESS DEFROST TEST

Y PROCEDURES TO BE TAKEN WHEN THE FUSE 1 ON THE PRINTED WIRING BOARD (PWB)

TEST PROCEDURES

COMPONENT TEST

WARNING : The oven should be fully assembled before following procedure.

(1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the SELECTA PROGRAM pad twice. And touch the SET pad. (3) Enter weight by touching the number pad 3. (Example: 0.3 lbs steak) (4) Touch the START pad. (5) The oven is in Express Defrost cooking condition. (6) The oven will operate as follows.

WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE

Steaks/Chops LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME

0.3lbs 70% 16sec. 0% 16sec. 50% 21sec. 30% 21 sec.

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

IS OPEN.

To protect the electronic circuits, this model is provided with a fuse added to the primary on the PWB.

1. Fuse 1 check and repairs.

1) Disconnect the power supply cord.

2) Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3) Open the door and block it open.

4) Discharge high voltage capacitor.

5) If the Fuse 1 is blown, replace power unit.

6) Make a visual inspection of the varistor. Check for burned damage. If the varistor has been burned, replace the power unit.

7) Examine the touch control transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 248Ω ± 10%). If any abnormal condition is detected, replace the touch control transformer.

8) Reconnect all leads removed from components during testing.

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

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

11) 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.

2) Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3) Open the door and block it open.

4) Discharge high voltage capacitor.

5) Disconnect the leads to the primary of the power transformer.

6) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

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

8) 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 connecter (CN-D).

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

side of touch control transformer. Check and replace touch control transformer, power

unit or CPU unit.

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

10) Open the door and block it open.

11) Discharge high voltage capacitor.

12) Reconnect all leads removed from components during testing.

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

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

15) Run the oven and check all functions.

Page 27

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-8000G

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

(1) Tact switch circuit on the CPU unit and the control unit (switch

unit).

(2) Control Unit (The control unit consists of Power unit and CPU

unit.)

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

Tact Switch Circuit

The tact switch circuit is composed of a matrix, signals AN0-AN7 generated in the LSI are sent to the tact switches. When a tact switch is touched, a signal is completed through the tact switch circuit and passed back to the LSI through PB0-PB3 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, temperature measurement circuit, relay watching circuit, input voltage watching circuit and indicator circuit.

1) LSI (IC-1)

This LSI controls the temperature measurement signal, tact switch strobe signal, relay driving signal and indicator signal. And also LSI watches the relay operation and the primary input voltage.

2) Power Source Circuit This circuit generates the voltage necessary for the control unit from the AC line voltage.

3) Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on commercial frequency.

5) Buzzer Circuit

The buzzer is responds to signals from the LSI to emit noticing sounds (tact switch touch sound and completion sound).

6) Temperature Measurement Circuit : (OVEN THERMISTOR)

The temperature in the oven cavity is sensed by the thermistor. The variation of resistance according to sensed temperature is detected by the temperature measurement circuit and the result applied to LSI. The LSI uses this information to control the relay and display units.

7) Relay Operation Watching Circuit

This circuit watches so that the three (3) relays for the top heating element, the side heating element and the power transformer do not operate at the same time. This circuit consists of the transistor Q24 - Q27 and resistors R23 - R26.

8) Input Voltage Watching Circuit

This circuit watches the primary input voltage.

9) Door Sensing Switch

A switch to inform the LSI if the door is open or closed.

10) Relay Circuit

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

11) Indicator Circuit

Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display has 10-digits, 42-segments are used for displaying figures.

12) Memory Processor (IC-2)

This is a memory IC, responsible for memory function.

4) Reset Circuit

A circuit to generate a signals which resetting the LSI to the initial state when power is applied.

DESCRIPTION OF LSI (IC-1)

LSI(IC-1):

The I/O signals of the LSI(IC-1) are detailed in the following table.

Pin No. Signal I/O Description

1 AN5 OUT Tact switch strobe signal.

Signal applied to tact switch section (SW1, SW4, SW7, SW10).

2 AN4 OUT Turminal not used.

3 AN3 OUT

4 AN2 OUT Tact switch strombe signal

5 AN1 OUT

6 AN0 OUT

Tact switch strobe signal.

Signal applied to tact switch section (SW14, SW18, SW22).

Signal applied to tact switch section (SW13, SW17, SW21).

Tact switch strobe signal.

Signal applied to tact switch section (SW12, SW16, SW20).

Tact switch strobe signal.

Signal applied to tact switch section (SW11, SW15, SW19, SW23).

Page 28

R-8000G

During cooking

16.7 msec.

Pin No. Signal I/O Description

7 AN15 IN Primary input voltage watching terminal.

The LSI is watching the primary input voltage through this terminal.

8-10 AN14-AN12 IN Input terminal to change the specification according to the model.

11 AN11 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.

12 AN10 IN

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

Door closed; “H” level signal(0V). Door opened; “L” level signal(-5V).

13 AN9 IN Turminal not used.

14 AN8 IN Turminal not used.

15 P83 OUT

Timing signal output terminal for temperature measurement(OVEN THERMISTOR).

“L” level (-5V) : Thermistor OPEN timing. “H” level (GND) : Temperature measuring timing.

16 P82 OUT

Oven lamp and turntable motor driving signal. (Square Waveform : 60Hz)

To turn on and off the shut-off relay(RY1). The square waveform voltage is delivered to the relay(RY1) driving circuit.

17 CNVSS IN Power source voltage: -5V.

VC voltage of power source circuit input.

18 RESET IN Auto clear terminal.

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

19 P81 OUT

Top heating element driving signal.

To operate the solid-state relay for driving the top heating element.

20 P80 OUT

Side heating element driving signal.

To operate the solid-state relay for driving the top heating element.

21 VSS IN Power source voltage: -5V.

VS voltage of power source circuit input.

22 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.

23 Xout OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of Xin.

24 VCC IN Power source voltage: 0V.

VC voltage of power source circuit input. Connected to GND.

25 P77 OUT

Signal to sound buzzer.

A: Tact switch touch sound.

0.1 sec

B: Completion sound.

C: When the oven stops so that the food can be

checked in Automatic cooking mode.

1.0 sec

26 P76 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay(RY2). In 100% power operation, the signals holds “L” level during microwave cooking and “H” level while not cooking. In other cooking modes (90%, 80%, 70%, 60%, 50%, 40%, 30%, 20%, 10%, 0%) the signal turns to “H” level and “L” level in repetition according to the power level.

VARI MODE ON TIME OFF TIME ON TIME OFF TIME

100% power 32 sec. 0 sec. 54sec. 0ec.

90% power 30 sec. 2 sec. 49sec. 5sec.

80% power 26 sec. 6 sec. 45sec. 9sec.

70% power 24 sec. 8 sec. 40sec. 14sec.

60% power 22 sec. 10 sec. 36sec. 18sec.

50% power 18 sec. 14 sec. 29sec. 25sec.

40% power 16 sec. 16 sec. 24sec. 30sec.

30% power 12 sec. 20 sec. 18sec. 36sec.

20% power 8 sec. 24 sec. 13sec. 41sec.

10% power 6 sec. 26 sec. 9sec. 45sec.

0% power 0 sec. 32 sec. 0sec. 54sec.

2.0 sec

1.0 sec

Microwave cooking mode

H: GND

Microwave cooking with other cooking mode

27 P75 OUT Cooling fan motor driving signal.

To turn on and off shut-off relay(RY5). “L” level during fan motor driving; “H” level otherwise

During

fan motor driving

OFF

GND

Page 29

Pin No. Signal I/O Description

OFF

During

Jet motor

driving

GND

16.7 msec.

H : GND

L (-5V)

28 P74 OUT Turminal not used.

29 P73 OUT

Jet motor driving signal.

To turn on and off shut-off relay(RY3). “L”level during jet motor driving “H” level otherwise

30 P72 OUT Control signal to turn over the rotatory direction of the jet motor.

31 P71 IN

Signal to synchronize LSI with commercial power source frequency.

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

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

33 P67 OUT Terminal to input the program to LSI.

34 P66 IN Terminal to input the program to LSI.

35 P65 OUT Memory (EEPROM) clock out.

36 P64 IN/OUT Terminal to input the program to LSI.

37-88

FLD51-FLD0 OUT Segment data signals.

The relation between signals and indicator are as follows:

Signal (Pin No.) Segment (Pin No.) Signal (Pin No.) Segment (Pin No.) Signal(Pin No.) Segment(Pin No.) FLD 0 (88) FLD 1 (87) FLD 2 (86) FLD 3 (85) FLD 4 (84) FLD 5 (83) FLD 6 (82) FLD 7 (81) FLD 8 (80) FLD 9 (79) FLD10 (78) FLD11 (77) FLD12 (76) FLD13 (75) FLD14 (74) FLD15 (73) FLD16 (72) FLD17 (71)

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

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

10G(45) FLD 18 (70)

9G (46) FLD 19 (69) 8G (47) FLD 20 (68) 7G (48) FLD 21 (67) 6G (49) FLD 22 (66) 5G (50) FLD 23 (65) 4G (51) FLD 24 (64) 3G (52) FLD 25 (63) 2G (53) FLD 26 (62) 1G (54) FLD 27 (61)

P1 (59) FLD 28 (60) P2 (60) FLD 29 (59) P3 (61) FLD 30 (58) P4 (62) FLD 31 (57) P5 (63) FLD 32 (56) P6 (64) FLD 33 (55) P7 (65) FLD 34 (54) P8 (66) FLD 35 (53)

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

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

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

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

P9 (67) FLD 36 (52) P10 (68) FLD 37 (51) P11 (69) FLD 38 (50) P12 (70) FLD 39 (49) P13 (71) FLD 40 (48) P14 (72) FLD 41 (47)

P42 (7) FLD 42 (46)

P41 (8) FLD 43 (45)

P40 (9) FLD 44 (44) P39 (10) FLD 45 (43) P38 (11) FLD 46 (42) P37 (12) FLD 47 (41) P36 (13) FLD 48 (40) P35 (14) FLD 49 (39) P34 (15) FLD 50 (38) P33 (16) FLD 51 (37) P32 (17) P31 (18)

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

R-8000G

P30 (19) P29 (20) P28 (21) P27 (22) P26 (23) P25 (24) P24 (25) P23 (26) P22 (27) P21 (28) P20 (29) P19 (30) P18 (31) P17 (32) P16 (33) P15 (34)

89 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -30V.

VEE voltage of power source circuit input.

90-92 PB6-P84 OUT Terminal not used.

93 PB3 IN Signal coming from tact switches (SW10, SW23).

94 PB2 IN Signal coming from tact switches (SW7-9, SW19-22).

95 PB1 IN Signal coming from tact switches (SW4-6, SW15-18).

96 PB0 IN Signal coming from tact switches (SW1-3, SW11-14)

97 AVSS IN A/D converter power source voltage.

The power source voltage to drive the A/D converter in the LSI.

98 VREF IN Reference voltage input terminal.

A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)

99 AN7 OUT

Tact switch strobe signal.

Signal applied to tact switch section (SW3, SW6, SW9).

100 AN6 OUT Tact switch strobe signal.

Signal applied to tact switch section (SW2, SW5, SW8).

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R-8000G

Memory Processor (IC-2)

Memory processor is a 16K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 2048 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.

TOP VIEW

VSS

Figure T-3 Relation between Pin Nos, and Signals

Pin No. Signal I/O Description

1-3 A0-A2 IN Connected to -5V. 4 VSS IN Connected to -5V. 5 SDA IN/OUT Serial data input/output : input/outputs data to IC1. 6 SCL IN Clock signal input : input/outputs sireal data at every one pulse. 7WPINConnected to -5V.

8 VCC IN Connected to GND.

TOUCH CONTROL PANEL 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. 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.

VCC

SCL

SDA

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 trans-

former.

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 trans-

former.

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

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R-8000G

(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).

3. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 60W (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

4. 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.

PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

“Main PWB” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder. Example:

Sn-Ag-Cu

Indicates lead-free solder of tin, silver and copper.

2. Using lead-free wire solder

When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks. As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40˚C, we recommend you to use a dedicated soldering bit.

3. Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is about 220˚C which is higher than the conventional lead solder by 40˚C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition. Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it. When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

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R-8000G

PROCEDURE FOR CHECKING/ SETTING TOTAL OPERATION TIME

This oven can display each total operation time (hours) of the top heating element, the side heating element and the magnetron.

Procedure for checking the total operation time (e.g. 1234 hours) of the top heating element.

STEP PROCEDURE DISPLAY

CUSTOM HELP x 4 CUNTER

CHECK

PRESS SET

SET PRESS SET

TO CHECK

TOTAL

2 COUNT

SELECT NUMBER PAD

SET 123456

CUSTOM HELP

Procedure for setting the total operation time (e.g. 1000 hours) of the top heating element.

STEP PROCEDURE DISPLAY

CUSTOM HELP x 4 CUNTER

CHECK

PRESS SET

SET PRESS SET

TO CHECK

TOTAL

2 COUNT

SELECT NUMBER PAD

SET 123456

CUSTOM HELP

SELECTA PROGRAME U 1234 H

STOP/ CLEAR

NOTE: 1 To check the total operation time of the side heating

element, touch SELECTA PROGRAM twice at step 6 above.

NOTE: 2 To check the total operation time of the magnetron,

touch SELECTA PROGRAM 3 times at step 6 above.

SELECTA PROGRAME U 1234 H

SET U 0 H

1,0,0,0 U 1000 H

SET SAVED

(After 1 sec.) .

NOTE: 1 To set the total operation time of the side heating

element, touch SELECTA PROGRAM twice at step 6 above.

NOTE: 2 To set the total operation time of the magnetron,

touch SELECTA PROGRAM 3 times at step 6 above.

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R-8000G

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. (Pull down the door handle in a closed position with one hand, then push the door 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 high voltage capacitor and wait for 60 seconds.

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

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

2) Hot parts: Oven lamp, Magnetron, Power transformer, Oven cavity and Heating element.

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.

3) Sharp edge:

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

4) Moveable parts (to prevent a fault)

Fan blade, Fan motor, Switch, Door cam, Jet motor, Convection fan, Turntable motor.

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 REMOVAL

1. Disconnect the power supply cord.

2. Open the oven door and block it open.

3. Remove the three (3) screws holding the exhaust cover to the back plate.

4. Remove the four (4) screws holding the louver cover to the back plate.

5. Remove the three (3) screws holding the rear side of the outer case cabinet to the back plate.

6. Remove the four (4) screws holding the right and left sides of

the outer case cabinet to the bottom plate.

7. Slide the entire outer case cabinet back out about 1 inch (3cm) to free it from retaining clips on the oven cavity front plate.

8. Lift entire outer case cabinet from the unit.

CAUTION

1. DISCONNECT THE OVEN FROM THE POWER SUPPLY BEFORE REMOVING THE OUTER CASE CABINET.

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

OVEN LAMP AND LAMP SOCKET REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the door and block it open.

4. Discharge high voltage capacitor.

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R-8000G

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

6. Tear the cushion from the light mounting plate.

7. Bend the tab of the light mounting plate holding the oven.

8. Pull out the oven lamp socket.

9. Remove the oven lamp from the oven lamp socket.

10. Now, the oven lamp socket is free.

TERMINAL INSULATOR REPLACEMENT

1. Open covers of the terminal insulator by using small flat type screw driver.

2. Remove the receptacle from the terminal insulator.

3. Now, the terminal insulator is free.

Terminal insulator

Figure C-2(a). Terminal insulator Figure C-2(b). Terminal insulator

Flat type screw driver

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Figure C-1. Oven lamp socket

Installation

1. Insert the receptacle into terminal insulator.

2. Close covers of the terminal insulator, as shown illustrated below

Covers

Receptacle

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

1. Push the lever of positive lock® connector.

2. Pull down on the positive lock® connector. CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CON-

NECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU.

POWER SUPPLY CORD REPLACEMENT

Removal

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the one (1) screw holding the green wire of the power supply cord to the bottom plate.

6. Disconnect the black wire and the white wire of the power supply cord from the noise filter.

7. Nip the cord bushing with bushing pliers and release it from the hole of the back plate.

8. Remove the cord bushing from the power supply cord, and the power supply cord from the back plate.

9. Now, the power supply cord is free.

Reinstall

1. Reinstall the cord bushing to the power supply cord.

2. Insert the power supply cord with the cord bushing into the hole of the back plate.

3. Hold the green wire of the power supply cord to the bottom plate

Terminal

Positive lock® connector

Lever

Push

Pull down

Figure C-3. Positive lock® connector

with the one (1) screw.

4. Reconnect the black wire and the white wire of the power supply cord to the noise filter, referring to the pictorial diagram.

5. Reinstall the outer case cabinet and check that the oven is operating properly.

Cord bushing

Power supply cord

Back plate

White wire

Noise filter

Bottom plate

WHT

Screw

BLK

High voltage capacitor

Green wire

Black wire

Figure C-4. Power supply cord replacement

Page 35

BACK PLATE REMOVAL

R-8000G

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the one (1) screw holding the green wire of the power supply cord to the bottom plate.

6. Disconnect the black wire and the white wire of the power supply cord from the noise filter.

POWER TRANSFORMER REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Disconnect the main wire harness from the power transformer.

7. Disconnect the high voltage wire and filament leads of the

MAGNETRON REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Disconnect the high voltage wire of the high voltage rectifier assembly from the magnetron.

7. Disconnect the filament wire of the power transformer from the magnetron.

8. Remove the two (2) screws holding the magnetron guide to the magnetron and remove it.

7. Remove the two (2) screws holding the back plate to the exhaust duct.

8. Remove the three (3) screws holding the back plate to the bottom plate.

9. Remove the two (2) screws holding the right and left chassis supports to the back plate.

10. Release the tabs of the chassis supports from the back plate.

11. Now, the back plate (with the power supply cord) is free.

power transformer from the high voltage capacitor and the magnetron.

8. Remove the four (4) screws holding the transformer mounting angle to the bottom plate from under the bottom plate.

9. Slide the transformer mounting angle rightward.

10. Remove the four (4) screws holding the power transformer to the transformer mounting angle.

11. Now, the power transformer is free.

9. Release the main wire harness from the hole of the magnetron separator and the hook of the fan motor.

10. Remove the three (3) screws holding the magnetron separator to the bottom plate and the thermal cover back.

11. Remove the magnetron separator from the oven.

12. Carefully remove the four (4) screws holding the magnetron to the waveguide. When removing the screws, hold the magnetron to prevent it from falling.

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

CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE

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

HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Disconnect the high voltage wire of the high voltage rectifier assembly from the magnetron.

7. Disconnect the high voltage wire and the filament lead of the power transformer from the high voltage capacitor.

8. Remove the one (1) screw holding the capacitor holder to the

fan motor mounting angle.

9. Remove the one (1) screw holding the high voltage rectifier assembly to the capacitor holder.

10. Disconnect the high voltage rectifier assembly from the high voltage capacitor.

11. Now, the high voltage rectifier assembly is free, and also the high voltage capacitor is free.

CAUTION: WHEN REPLACING THE HIGH VOLTAGE RECTI-

FIER ASSEMBLY, THE GROUND SIDE TERMINAL MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

FAN MOTOR REMOVAL

POWER TRANSFORMER SIDE

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK

PLATE REMOVAL”.

6. Remove the one (1) screw holding the capacitor holder to the fan motor mounting angle. And remove the capacitor holder from the fan motor mounting angle.

7. Disconnect the wire leads from the fan motor.

8. Remove the four (4) screws holding the fan motor mounting angle to the bottom plate and the thermal cover back.

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R-8000G

9. Remove the three (3) screws holding the fan motor to the fan motor mounting angle.

10. Now, the fan motor is free.

MAGNETRON SIDE REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Disconnect the wire leads from the fan motor.

7. Disconnect the connector of the main wire harness from the connector of the thermistor.

8. Release the main wire harness from the hole of the magnetron separator and the hook of the fan motor.

9. Remove the three (3) screws holding the magnetron separator to the bottom plate and the thermal cover back.

10. Remove the magnetron separator from the oven.

11. Remove the one (1) screw holding the fan motor to the bottom plate.

12. Now, the fan motor is free.

SOLID-STATE RELAY REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Disconnect the wire leads and the connector from the solidsate relay.

6. Remove the two (2) screws holding the solid-sate relay to the radiation plate.

7. Now, the solid-sate relay is free. CAUTION: WHEN THE SOLID-STATE RELAY IS INSTALLED,

APPLY THE SILICON GREASE (SHINETSU SILICON GREASE G746 OF SHINETSU CHEMICAL CO., LTD.) TO THE BACK SIDE OF THE SOLIDSTATE RELAY IN A THICKNESS OF 0.3MM. THIS IS TO PREVENT THE OVER HEATING OF THE SOLID-STATE RELAY.

EXHAUST DUCT, HEATER DUCT LEFT ASSEMBLY, CONVECTION DUCT ASSEMBLY AND

HEATER DUCT UPPER ASSEMBLY REMOVAL

EXHAUST DUCT REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Remove the door assembly from the oven, referring to “DOOR REPLACEMENT”, and remove the door springs, the door cam right and the door cam left.

7. Remove each two (2) screws holding the oven hinges left and right.

8. Remove the power transformer, magnetron, magnetron separator, high voltage capacitor assembly, fan motor (power transformer side) with fan motor mounting angle, and fan motor (magnetron side), referring to their removal procedures.

9. Disconnect the wire leads from all electrical parts except for the turntable motor, monitor switch, secondary interlock switch, door sensing switch and 3rd. latch switch.

10. Remove each one (1) screw holding the latch hook right and latch hook left from the oven cavity front plate.

11. Remove each one (1) screw holding the right and left chassis supports to the oven cavity front plate.

12. Remove the two (2) screws holding the exhaust duct to the oven cavity. And remove it.

13. Now, exhaust duct is free.

HEATER DUCT LEFT ASSEMBLY REMOVAL

14. Remove the three (3) screws holding the damper duct assembly to the thermal cover upper and the waveguide.

15. Remove the damper duct assembly from the oven.

16. Remove the one (1) screw holding the thermal cover back to the separator left.

17. Remove the two (2) screws holding the separator left to the thermal cover upper. And remove it.

18. Disconnect the connector of the touch control transformer from the power unit.

19. Remove the one (1) screw holding the touch control transformer to the bottom plate. And remove it.

20. Remove the two (2) screws holding the PWB mounting angle to the bottom plate.

21. Remove the PWB mounting angle with the power unit from the bottom plate.

22. Remove the three (3) screws holding the thermal cover left to the heater duct left.

23. Remove the one (1) screw holding the thermal cover left to the thermal cover upper.

24. Straighten the three (3) tabs holding the thermal cover left to the oven cavity, and remove the thermal cover left and the thermal insulation left from the oven cavity.

25. Remove the two (2) screws holding the thermal cover upper to the heater duct upper.

26. Straighten the four (4) tabs holding the thermal cover upper to the oven cavity, and remove the thermal cover upper and the thermal insulation upper from the oven cavity.

27. Straighten the two (2) tabs holding the thermal insulation upper, and remove it.

28. Remove the fourteen (14) screws holding the heater duct left to the oven cavity and the convection duct.

29. Remove the heater duct left assembly from the oven cavity.

30. Now, the heater duct left assembly is free.

CONVECTION DUCT ASSEMBLY REMOVAL

31. Remove the two (2) screws holding the convection motor mounting angle to the bottom plate from under the bottom plate.

32. Remove the fourteen (14) screws holding the convection duct to the oven cavity and the heater duct upper.

33. Remove the convection duct assembly (with the jet motor) from the oven cavity.

34. Now, the convection duct assembly (with the jet motor) is free.

HEATER DUCT UPPER ASSEMBLY REMOVAL

35. Remove the nine (9) screws holding the heater duct upper to the oven cavity.

36. Remove the heater duct upper from the oven cavity.

37. Now, the heater duct upper assembly is free.

Page 37

SIDE HEATING ELEMENT REMOVAL

Door sensing switch

Latch hook right

Monitor switch

3rd. latch switch

Latch hook left

Secondary interlock switch

Pole Pole

Stopper tab

R-8000G

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Remove the heater duct left assembly from the oven cavity,

JET MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Remove the convection duct assembly from the oven cavity, referring to "EXHAUST DUCT, HEATER DUCT LEFT ASSEMBLY, CONVECTION DUCT ASSEMBLY AND HEATER DUCT UPPER ASSEMBLY REMOVAL".

TOP HEATING ELEMENT REMOVAL

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.

6. Remove the heater duct left assembly from the oven cavity,

referring to "EXHAUST DUCT, HEATER DUCT LEFT ASSEMBLY, CONVECTION DUCT ASSEMBLY AND HEATER DUCT UPPER ASSEMBLY REMOVAL".

7. Remove the one (1) screw holding the heater mounting angle B to the heater duct left.

8. Remove the two (2) nuts holding the side heating element to the heater duct left.

9. Now, the side heating element is free.

7. Loosen the one (1) screw holding the convection fan assembly to the jet motor shaft with a hexagon key wrench, and remove the convection fan.

8. Remove the four (4) screws holding the convection motor mounting angle to the convection duct.

9. Remove the six (6) screws holding the jet motor to the convection motor mounting angle.

10. Remove the jet motor from the convection motor mounting angle.

11. Now, the jet motor is free.

referring to "EXHAUST DUCT, HEATER DUCT LEFT ASSEMBLY, CONVECTION DUCT ASSEMBLY AND HEATER DUCT UPPER ASSEMBLY REMOVAL".

7. Remove the one (1) screw holding the heater mounting angle A to the heater duct upper.

8. Remove the two (2) nuts and the two (2) screws holding the top heating element to the heater duct upper.

9. Now, the top heating element is free.

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Wait for 60 seconds to discharge the high voltage capacitor.

3. Remove the turntable tray and the turntable support from the oven cavity.

4. Lay the oven on its backside.

5. Remove the turntable motor cover by snipping off the material in four corners.

6. Where the corners have been snipped off, bend corner areas

DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH, 3RD LATCH SWITCH AND

MONITOR SWITCH REPLACEMENT

Removal

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Disconnect the wire leads from the switch.

6. Remove the one (1) screw holding the latch hook (right or left) to the oven cavity front plate, and release the latch hook (right or left).

7. Keep pushing the stopper tab holding the switch to the latch hook (right or left) and revolve the switch on the pole.

8. Remove the switch from the latch hook (right or left).

9. Now, the switch is free.

flat. No sharp edges must be evident after removal of the turntable motor.

7. Disconnect the wire leads from the turntable motor.

8. Remove the one (1) screw holding the turntable motor to the oven cavity bottom plate.

9. Now, the turntable motor is free.

10. After replacement, use the one (1) screw to fit the turntable motor cover.

Figure C-5. Switches

Page 38

R-8000G

Reinstallation

1. Reinstall the switch in its place. The door sensing switch is in the lower position of the latch hook right. The 3rd. latch switch is in the upper position of the latch hook right. The secondary interlock switch is in the lower position of the latch hook left. And the monitor switch is in the upper position of the latch hook left.

2. Hold the latch hook (right or left) to the oven cavity front plate with the one (1) screw.

3. Reconnect the wire leads to the switch.

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

DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH, 3RD LATCH SWITCH AND

MONITOR SWITCH ADJUSTMENT

If the door sensing switch, secondary interlock switch, 3rd latch switch and monitor switch do not operate properly due to a misadjustment, the following adjustment should be made.

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Loosen each one (1) screw holding the latch hook right and the latch hook left to the oven cavity front plate.

6. With door closed, adjust the latch hook right and the latch hook left by moving them back and forth, and up and down. In and out play of the door allowed by the latch hook right and the latch hook left should be less than 0.5 mm. The vertical position of the latch hook right and the latch hook left should be adjusted so that the door sensing switch and the secondary interlock switch are activated with the door closed. The horizontal position of the latch hook right and the latch hook left should be adjusted so that the plungers of the monitor switch and the 3rd. latch switch are pressed with the door closed.

7. Secure the screws firmly.

8. Check all of the switches operation. If each switch has not activated with the door closed, loosen the screws and adjust the position of the latch hook right and the latch hook left.

After adjustment, check the following.

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

face. Both results (play in the door) should be less than 0.5 mm.

2. The door sensing switch and the secondary interlock switch interrupt the circuit before the door can be opened.

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

4. The 3rd. latch switch interrupt the circuit when the door is opened.

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

Monitor switch

Latch hook left

Latch head

Secondary interlock switch

Latch hook right

Latch head

Door sensing switch

Figure C-6. Latch Switch Adjustment

3rd. latch switch

DOOR REPLACEMENT AND ADJUSTMENT

Door assembly removal

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Close the door.

6. Remove the two (2) door springs from the door cam right, oven hinge right, door cam left and oven hinge left.

7. Release the door cams right and left from the right and left door cam pins of the door.

8. Remove the door cams right and left from the oven cavity front plate.

9. Open the door assembly at an angle of more than 90˚ with the oven cavity front plate.

10. To release the right and left door hinge pins of the door assembly from the oven hinges right and left, slide the door assembly leftward. When removing the door assembly, hold the door assembly to prevent it from falling.

11. Now, the door assembly is free.

NOTE: When the individual parts are replaced, refer to “Door

Disassembly”

Door assembly reinstallation

1. On reinstalling the door assembly, insert the oven hinges right and left into the right and left door hinge pins.

2. Insert and hook the door cams right and left to the right and left door cam pins.

3. Reinstall the two (2) door springs between the door cams and the oven hinges right and left.

NOTE: After any service to the door;

(A) Make sure that the door sensing switch, the secondary

interlock switch, the 3rd. latch switch and the monitor switch are operating properly. (Refer to chapter “Test Procedure”.)

(B) An approved microwave survey meter should be used to

assure compliance with proper microwave radiation emission limitation standards.

Page 39

Door adjustment

Door cam left

Door assembly

Door spring

Oven hinge left

Oven hinge right

Door cam right

When removing and/or loosening the oven hinges such as in door replacement, the following adjustment criteria are taken. Door adjustment is performed with the door properly installed and closed and while the oven hinges are loose.

1. Loosen the screws holding the oven hinge right and the oven hinge left to the bottom plate with screwdriver.

2. Adjust the door by moving it so that the door is parallel with the oven cavity front plate lines (right and left side lines) and the door latch heads pass through the latch holes correctly.

3. Tighten the screws holding the oven hinge right and the oven hinge left to the bottom plate.

After adjustment, make sure of the following:

1. The door latch heads smoothly catch the latch hooks through latch holes and the latch heads goes through center of latch holes.

2. The door is positioned with its face pressed toward oven cavity front plate.

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

NOTE: The door on a microwave oven is designed to act as an

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

Left door hinge pin

Figure C-7(a). Door Replacement

Left door cam pin

Door cam left

Oven hinge left

Door assembly

Right door hinge pin

Figure C-7(b). Door Replacement

R-8000G

Right door cam pin

Door cam right

Oven hinge right

DOOR DISASSEMBLY

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Remove the door assembly, referring to “Door Replacement”.

6. Place the door assembly on a soft cloth with latch heads facing up.

NOTE: As the engaging parts of the choke cover and the door

panel assembly are provided at 16 places, do not force any particular part.

7. Replacement of the door components are as follows:

CHOKE COVER

8. Insert a putty knife (thickness of about 0.5 mm) into the gap between the choke cover and the door panel assembly as shown in Figure C-8.

9. Lift up the choke cover.

10. Now, the choke cover is free from the door panel assembly.

NOTE: When carrying out any repair to the door, do not bend or

wrap the slit choke (tabs on the door panel assembly) to prevent microwave leakage.

DOOR HANDLE ASSEMBLY

11. Remove the two (2) screws holding the door handle assembly to the door panel assembly through the door frame.

12. Now, the door handle is free.

DOOR PANEL ASSEMBLY, LATCH HEAD RIGHT AND LATCH HEAD LEFT

13. Remove the fourteen (14) screws holding the door panel assembly to the door frame.

14. Remove the door panel assembly from the door frame.

15. Remove the one (1) screw holding the latch head right to the door panel assembly.

16. Remove the latch spring right from the latch head right and the handle lever.

17. Now, the latch head right is free.

18. Remove the one (1) screw holding the latch head left to the door panel assembly.

19. Remove the latch spring left from the latch head left and the handle lever.

20. Now, the latch head left is free.

21. Release the two (2) handle springs from the two (2) handle levers.

22. Pull out the two (2) handle pins from the two (2) handle levers.

23. Remove the two (2) handle levers and two (2) handle springs from the door panel.

24. Now, the door panel is free.

MIDDLE DOOR GLASS

25. Remove the two (2) screws holding the glass mounting angle B to the door frame.

26. Remove the middle door glass from the door frame.

27. Now, the middle door glass is free.

Page 40

R-8000G

Choke Cover

Door Frame

Door Panel Assembly

Putty Knife

FRONT DOOR GLASS

28. Remove each two (2) screws holding the two glass mounting angles A to the door frame.

29. Remove the two (2) glass mounting angles A from the door frame.

30. To release the two (2) tabs holding the lower end of the front door glass, slide the front door glass upward.

31. Release the three (3) tabs holding the upper end of the front door glass and remove the front door glass from the door frame.

32. Now, the front door glass is free.

CONTROL PANEL ASSEMBLY, CPU UNIT AND CONTROL UNIT REMOVAL

Figure C-8. Door Disassembly

Control panel assembly

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Disconnect the harness assembly from the connector CN-G on the power unit.

6. Remove the four (4) screws holding the control panel assembly to the oven cavity front plate.

7. Slide the control panel assembly leftward to release the eight (8) tabs of the control panel assembly from the oven cavity front plate.

8. Now, the control panel assembly is free.

CPU unit

9. Remove the four (4) screws holding the panel angle to the panel sub assembly.

10. Release the panel angle from the two (2) tabs of the panel sub assembly first.

11. Pull out the panel angle from the panel sub assembly and remove it.

12. Disconnect the harness from the connector CN-J on the CPU unit.

13. Disconnect the harness assembly from the connector CN-H on the CPU unit.

14. Remove the seven (7) screws holding the CPU unit to the panel sub assembly.

15. Now, the CPU unit is free.

Control unit

14. Remove the eleven (11) screws holding the control unit to the panel sub assembly.

15. Now, the control unit is free.

NOTE: After the panel angle is removed from the panel sub

assembly, it is can be found that the bottom side of the panel sub assembly is transformed by heat. But it is not abnormal and no problem to use the oven.

Screw

Bottom side of panel sub assembly

Screw

Panel angl

Screw

Figure C-9. Panel Angle Removal

Tabs

Panel sub assembly

Page 41

R-8000G

SERVICE MAINTENANCE CLEANING

It is recommended to schedule maintenance cleaning for the following portions 12 months or more often if heavy grease-laden foods are cooked very frequently.

Portions to be cleaned:

1) Inside surface of Exhaust duct

2) Inside surface of Heater duct left

3) Inside surface of Convection duct

4) Convection fan

5) Inside surface of Heater duct upper

6) Left outside wall of oven cavity (site for Heater duct left)

7) Rear outside wall of oven cavity (site for Convection duct)

8) Upper outside wall of oven cavity (site for Hater duct upper and Exhaust duct)

1. Disconnect the power supply cord.

2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".

3. Open the oven door and block it open.

4. Discharge the high voltage capacitor.

5. Refer to the chapter of "EXHAUST DUCT, HEATER DUCT LEFT ASSEMBLY, CONVECTION DUCT ASSEMBLY, HEATER DUCT UPPER ASSEMBLY REMOVAL", "SIDE HEATING ELEMENT REMOVAL", "JET MOTOR REMOVAL", and "TOP HEATING ELEMENT REMOVAL". And prepare so that the above portions are touched.

6. Wipe and clean the above portions with a soft cloth or sponge that is damp with water or mild soap.

8. After cleaning, dry the cleaned portions fully.

9. Assemble the microwave oven completely.

CAUTION : DO NOT SPREAD WATER OR SOAP ON THE SIDE HEATING ELEMENT AND THE TOP HEATING ELEMENT BECAUSE

THEY MAY RUST OR CAUSE POOR-INSULATION. TO CLEAN THEM, CARRY OUT “REFRESH CYCLE” OPERATION, REFERRING TO THE OPERATION MANUAL, IN A FULLY ASSEMBLED CONDITION. REFRESH CYCLE IS THE CONVECTION COOKING MODE AT 450˚C FOR 30 MINUTES.

Page 42

R-8000G

TURNTABLE

MOTOR

TOUCH CONTROL

TRANSFORMER

JET MOTOR

CAPACITOR

RY2

RY3

RY5

GRN

WH-A

CN-J

CN-H

RY2:

PRIMARY

INTERLOCK

RELAY

TOP HEATER

THERMAL

CUT-OUT

To POWER UNIT

From CPU UNIT

MAGNETRON

TEMPERATURE

FUSE

GRY

CN-A

CN-B

N.O.

CN-B

CN-A

SECONDARY

INTERLOCK

SWITCH

CONTROL UNIT

(SWITCH UNIT)

CPU

UNIT

HIGH VOLTAGE

COMPONENTS

POWER UNIT

TOP

HEATING

ELEMENT

MONITOR

SWITCH

JET MOTOR

THERMISTOR

POWER SUPPLY CORD

120V 60Hz

NOTE:

The grounding conductor of the power supply cord

has been grounded by power supply cord fixing

screw. The screw must be kept allways tight.

GRN

FUSE F10A

MAGNETRON

HIGH VOLTAGE

CAPACITOR

HIGH VOLTAGE

RECTIFIER

POWER

TRANSFORMER

BLK

WHT

RED

BLK

RED

WHT

RED

DOOR

SENSING

SWITCH

3RD. LATCH

SWITCH

BRN

RED

COM.

N.O.

COM.

N.C.

BLK

ORG

RED

YLW

WHT

BLU

BRN

CN-E

CN-C

CN-G

COM.

CN-D

FUSE1

GRY

WHT

COM.

N.C.

GRY

WHT

GRY

WHT

BLK

CN-C

CN-D

BLU

GRN

WHT

BRN

GRY

RY6

RY1

COM.

N.O.

RED

WHT

GRY

BLK

WHT

GRY

ORG

FAN MOTOR

(Power transformer side)

BRN

BLK

RED

BRN

ORG

RED

BRN

BLK

SOLID-STATE RELAY

(For side heating

element control)

SOLID-STATE RELAY

(For top heating element control )

WHT

ORG

WHT

BLU

RED

WHT

BLU

RED

WHT

BLU

RED

SIDEHEATER

THERMAL CUT-OUT

TERMINAL

BOARD

GRY

RED

WHT

BLK

WHT

BLK

GRN

NOISE FILTER AND MONITOR FUSE 20A

SIDE

HEATING

ELEMENT

BRN

RED

ORG

RED

OVEN LAMP

& SOCKET

Blue

Mark

NOTE:

Hot (BLK) wire must be

connected to the terminal

with blue mark on the

oven light socket.

3421

CN-E

321

FAN MOTOR

(Magnetron side)

BLK

Figure S-1. Pictorial Diagram

Page 43

R-8000G

TURN

OVER

JET

MOTOR

FAN

MOTOR

TOP

HEATER

SIDE

HEATER

COM

TTM,OL

: 0.01uF/50V

VCC

SDA

SCLK BUSY

CNVSS

RESET

VSS

CN-F

PB0

PB1

PB2

PB3

FLD0 FLD1 FLD2 FLD3 FLD4 FLD5 FLD6 FLD7 FLD8 FLD9

FLD11 FLD12 FLD13 FLD14 FLD15 FLD16 FLD17 FLD18 FLD19 FLD20 FLD21 FLD22 FLD23

FLD10

FLD24

FLD25

FLD26

FLD27

FLD28

FLD29

FLD30

FLD31

FLD32

FLD33

FLD34

FLD35

FLD36

FLD37

FLD38

FLD39

FLD40

FLD41

FLD42

FLD43

FLD44

FLD45

FLD46

FLD47

FLD48

FLD49

FLD50

FLD51

DG1

P14

P13

P12

P11

P10

10G

32 31

P42

P41

P40

P39

P38

P37

P36

P35

P34

P33

P32

P31

P30

P29

P28

P27

P26

P25

P24

P23

P22

P21

P20

P19

P18

P17

P16

P15

FLD37

FLD36

FLD35

FLD34

FLD33

FLD32

FLD31

FLD30

FLD29

FLD28

FLD27

FLD26

FLD25

FLD24

FLD23

FLD22

FLD21

FLD20

FLD19

FLD18

FLD17

FLD16

FLD15

FLD14

FLD13

FLD12

FLD11

FLD10

FLD9

FLD8

FLD7 FLD6 FLD5 FLD4 FLD3 FLD2 FLD1

FLD0 VEE PB6 PB5 PB4 PB3 PB2 PB1 PB0

AVss Vref AN7 AN6

IC-1

P71

P70

P67

P66

P65

P64

FLD51

FLD50

FLD49

FLD48

FLD47

FLD46

FLD45

FLD44

FLD43

FLD42

FLD41

FLD40

FLD39

FLD38

AN5

AN4

AN3

AN2

AN1

AN0

AN15

AN14

AN13

AN12

AN11

AN10

AN9

AN8

P83

P82

P81

P80

CNVss

RESET

VSS

Xin

Xout

VCC

P77

P76

P75

P74

P73

P72

G,H6

G,H7

G,H8

G,H12

G,H15

G,H14

F-8 F-7 F-6 F-5 F-4 F-3 F-2 F-1

AC208V

60Hz

VRS1

FUSE1

10G471K

1N4002L x4

6.8

100u/10V

2200u/35V

0.1u/50V

300

10u/50V

C11

DTA143ESA

0.01u

/50 V

0.01u

/50V

0.01u

/50 V

C50C51

D21

D20

1N5817

D10

D13D11D14D15

RY6

VE-24HE-K

RY3

RY5

FTR-F3AA024E

RY1

DU18D1-1P(M)-R-S

RY2

0.1u

/50 V

CN-A

(J1)

(J2)

DTA123EKA

KRA117S

ZD1

4.7K

(J10)

(J12)

(J14)

(J11)

(J13)

(J15)

AN12

AN13

AN14

4.7K

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R60

R61

SP1

R11

R10

1.5K 1/4W

3.3K 1/4W

1.5K 1/4W

ZD6

HZ20-1

Q14

Q18

Q17

Q15

Q13

Q10

Q11

Q12

P72

P73

P75

P76

P82

P81

P80

C10

0.1u/16V

D16

D18

D17

R21

R20

C20

CF1

R76

R77

R75

C75

IC-2

R41

C40

R42

R40

Q40

ZD10

P83AN11

AN10

R13

R14

C14

HZU20B13.3K1.5K

0.1u/50V

C13

C12

HZU3.6B2

4.7K

0.1u/16V

47K

4.7K

1SS355

330F

18KF

4.7K

DTC143EKA

52808-0890

4.7K

47K

CN-D

CN-E

CN-J

DOOR SENSING SW

OTH

10Pin

J10

AN0

AN1

AN2

AN3

AN4 AN5

AN6 AN7

SW1-10

CN-G

B4P-VH

B3P-VH

B5P9-VH

B2P3

AT24C16N-10SI-2.7

S10B-PH

G4A-1A-DC24V

R78

47K

H,G5

H,G11

G,H4

G,H16

G,H10

G,H9

G,H3

G,H2

G,H1

START

(SW11)

1.5K

R24

R25

R26

Q24

Q25

Q26

Q27

KRA223S

KTC3875S

R23

1/4W

KRC243M or

DTD143ES

NOTE:

IF NOT SPECIFIED

: DTA143EKA or KRA101S

: 1/16W±5%

: 1SS270A or 1SS133

100Kx10

R70

R71

100Kx10

KXA080

VSS

VCC

SCL

SDA

CN-B

or KRC101S

2.2K

CN-H

S16B-PH

B16B-PH

4MHz

(SW1)

CONVENIENCE

APPETIZERS

& SNACKS

(SW2)

(SW3)

(SW6)

(SW5)

(SW4)

(SW7)

(SW10)

(SW8)

(SW9)

SET

BAKED

GOODS

CONVENIENCE

MEAT, FISH

& POULTRY

BASIC

COOK

SELECTA

TIME

SELECTA

POWER

SELECTA

PROGRAM

CUSTOM

HELP

DOUBLE/

TRIPLEQTY

WH-A

SW11-23

(SW12)

(SW13) (SW14)

(SW18)

(SW17)

(SW16)

(SW15)

(SW22)(SW21)(SW20)

(SW19)

(SW23)

OVEN READY

ON/OFF

STOP

CLEAR

MINUTEPLUS

KIA79L05P

D1-D4

-VH

B6P(8-5,7)

-VH

MICRO

2SB1238

Q19

CN-C

G,H13

Figure S-2. Power Unitl, CPU Unit and Control Unit Circuit

Page 44

R-8000G

S1 S2 S3 S4 S5 S6 S7 S8 S9

2G 3G 4G

col1

col2

Dp2

Dp3

5G 6G 7G 8G 9G 10G

col1

col2

Dp2

Dp3

Dp2

Dp3

[ 1G - 10G ]

Figure S-3. Grid Assignment of Fluoresent Display Tube

Figure S-4. Printed Wiring Board of Power Unit

Page 45

R-8000G

Figure S-5(a). Printed Wiring Board of CPU Unit (Component side)

Figure S-5(b). Printed Wiring Board of CPU Unit (Solder side)

Figure S-6. Printed Wiring Board of Control Unit (Switch Unit)

Page 46

R-8000G

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

ELECTRICAL PARTS

1- 1 QSW-MA085WRE0 Secondary interlock/3rd. Latch/door sensing switches 3 AF 1- 2 FPWBFA370WRKZ Noise filter 1 AZ 1- 3 RHET-A282WRZZ Top heating element 1 BB 1- 4 RHET-A281WRZZ Side heating element 1 BB 1- 5 FH-HZA053WRE0 Thermistor 1 AM 1- 6 RMOTCA015WRZZ Jet motor 1 BR 1- 7 RMOTDA255WRZZ Turntable motor 1 AW 1- 7 RMOTDA189WRE0 Turntable motor (Interchangeable) 1 AT 1- 8 FMOTEA474WRKZ Fan motor assembly 2 BE 1- 9 FACCDA104WREZ Power supply cord 1 BD 1-10 FH-DZA104WRKZ High voltage rectifier assembly 1 AN

1-11 RC-QZA288WRZZ High voltage capacitor (Interchangeable) 1 AW

1-11 RC-QZA235WRE0 High voltage capacitor 1 AU

1-12 FFS-BA033WRKZ Monitor fuse 20A and monitor switch (V-5220Q) assembly 1 AM 1-13 VHRG3NE22TL-1 Solid-state relay 2 AY 1-14 QFS-CA026WRZZ Fuse F10A 1 AH 1-15 QFS-TA014WRE0 Temperature fuse 150 deg. C (MG) 1 AG 1-16 QSOCLA021WRE0 Oven lamp socket 1 AG 1-17 QFSHDA019WRE0 Fuse holder 1 AH 1-18 RC-QZA311WREZ Jet motor capacitor 1 AQ 1-19 RLMPTA089WRZZ Oven lamp 1 AM 1-20 RTHM-A109WRE0 1-20 RTHM-A048WRE0 1-21 RTHM-A110WRE0 1-22 RTRN-A716WRZZ Power transformer 1 BS

1-23 RTRNPA003WRZZ Touch control transformer 1 AY 1-24 RV-MZA294WRE0 Magnetron 1 BL

∆

1-25 QTANDA001WRZZ Terminal board 1 AE

2- 1 GCABDA104WRPZ Back plate 1 AZ 2- 2 GDAI-A356WRWZ Bottom plate 1 AW 2- 3 GLEGPA096WREZ Front leg 2 AD 2- 4 GCABUA906WRPZ Outer case cabinet 1 BH 2- 5 GCOVHA449WRWZ Turntable motor cover 1 AP

3- 1 DPWBFC375WRKZ Power unit 1 BK 3- 2 DPWBFC374WRKZ CPU unit 1 BT 3- 3 DPWBFC377WRKZ Control unit (switch unit) 1 BK 3- 4 FPNLCB769WRKZ Panel sub assembly 1 BD 3- 4-1 HDECAA231WRPZ Sus decoration 1 AU 3- 4-2 HDECQA228WRTZ Panel decoration 1 AN 3- 4-3 XEBSD30P08000 Special screw 7 AA 3- 4-4 PCUSGA641WRPZ Cushion 2 AG 3- 5 FW-VZB993WREZ Harness assembly 1 AT 3- 6 GMADIA115WRFZ Display window 1 AD 3- 7 LANGKB018WRPZ Panel angle 1 AV 3- 8 PCUSGA583WREZ Cushion 1 AH 3- 9 PSHEPA960WREZ Key sheet 1 AY 3-10 XEPSD30P10000 Screw; 3mm x 10mm 22 AA

4- 1 DFTA-A017WRYZ Damper duct assembly 1 AZ 4- 2 PZETEA084WRFZ PWB mounting angle 1 AL 4- 3 PCUSGA600WREZ Cushion 1 AF 4- 4 MLEVPA248WRFZ Switch lever right A 1 AH 4- 5 MLEVPA249WRFZ Switch lever right B 1 AH 4- 6 MSPRCA146WREZ Spring 1 AE 4- 7 MSPRTA222WREZ Spring 2 AE 4- 8 MLEVPA250WRFZ Switch lever left A 1 AH 4- 9 LANGFA242WRPZ Heater mounting angle A 1 AS 4-10 PDUC-A821WRTZ Heater duct upper 1 BF 4-11 MLEVPA251WRFZ Switch lever left B 1 AH 4-12 LANGFA260WRPZ Heater mounting angle B 1 AS 4-13 PDUC-A822WRTZ Heater duct left 1 BF 4-14 FANGTA167WRKZ Coupling assembly 1 AK

Thermal cut out 170 deg.C(Top heater) 170deg.C OFF 155deg.C ON Thermal cut out 170 deg.C " " (Interchangeable) Thermal cut out 150 deg.C(Side heater) 150deg.C OFF 130deg.C ON

CABINET PARTS

CONTROL PANEL PARTS

OVEN PARTS

1AM 1AH 1AK

Page 47

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

4-15 FDUC-A381WRWZ Exhaust duct 1 AZ 4-16 FFANMA016WRKZ Convection fan assembly 1 AZ 4-17 LANGFA243WRPZ Convection motor mounting angle 1 AS 4-18 PDUC-A825WRPZ Convection duct 1 AW 4-19 PFPF-A229WREZ Thermal insulator back 1 AP 4-20 PREFHA072WRWZ Thermal cover back 1 AV 4-21 PSKR-A388WRWZ Divide plate A 1 AS 4-22 PSKR-A389WRWZ Divide plate B 1 AS

∆

4-23 ************* Oven cavity (Not replaceable part) 1 -4-24 LANG-A095WRPZ Turntable mounting angle 1 AN 4-25 LANGQA569WRPZ Separator left 1 AS 4-26 LANGQA596WRWZ Light mounting plate 1 AS 4-27 PSKR-A387WRPZ Magnetron separator 1 AS 4-28 PCUSGA601WREZ Cushion 1 AC 4-29 PCUSGA603WREZ Cushion 2 AD 4-30 PFPF-A236WRPZ Thermal insulation left 1 AX 4-31 PSKR-A400WRFZ Rear separator 1 AS 4-32 PFPF-A237WRPZ Thermal insulation Upper 1 AX 4-33 PFPF-A228WRPZ Thermal insulation Bottom 1 AQ 4-34 PGLSPA597WRZZ Lamp glass 1 AF 4-35 PPACGA189WREZ Silicon packing 1 AE 4-36 PREFHA077WRPZ Thermal cover Upper 1 AV 4-37 PREFHA078WRWZ Thermal cover Left 1 AV 4-38 PREFHA071WRPZ Thermal cover D 1 AV 4-39 LANGQA572WRPZ Fan motor mounting angle 1 AS 4-40 LBNDKA158WRPZ Capacitor holder 1 AF

∆

4-41 FHNG-A316WRYZ Oven hinge Left 1 AU

∆

4-42 FHNG-A317WRYZ Oven hinge Right 1 AU

∆

4-43 PHOK-A134WRFZ Latch hook Right 1 AL

∆

4-44 PHOK-A135WRFZ Latch hook Left 1 AL 4-45 GCOVHA460WRPZ Louver cover 1 AS 4-46 LANG-A096WRPZ Transformer mounting angle 1 AN 4-47 LANGFA241WRWZ Chassis support 2 AS 4-48 LANGKB019WRWZ Magnetron guide 1 AV 4-49 MCAMPA115WRMZ Door cam Left 1 AP 4-50 MCAMPA116WRMZ Door cam Right 1 AP 4-51 MSPRTA219WREZ Door spring 2 AE 4-52 PCOVPA402WREZ Waveguide cover 1 AK 4-53 PCUSGA602WREZ Cushion 1 AG 4-54 GCOVHA446WREZ Screw cap 1 AC 4-55 PCUSGA584WREZ Cushion 2 AB 4-56 PCUSUA589WREZ Cushion 1 AC 4-57 PCUSGA585WREZ Cushion 1 AB 4-58 PCUSUA591WREZ Cushion 1 AD 4-59 PCUSUA592WREZ Cushion 2 AC 4-60 PCOVPA389WREZ Edge cover 2 AC 4-61 PCUSUA614WREZ Cushion 1 AB 4-62 PCUSUA609WREZ Cushion 1 AD 4-63 PCUSUA610WREZ Cushion 1 AE 4-64 PCUSUA611WREZ Cushion 3 AB 4-65 PCUSUA612WREZ Cushion 1 AC 4-66 PCUSUA502WRP0 Cushion 1 AD 4-67 LANGKB074WRPZ Glass mounting plate 1 AV 4-68 PCUSGA637WRPZ Cushion 1 AG 4-69 MSPRCA147WREZ Spring 1 AE 4-70 MSPRTA220WREZ Spring 1 AD 4-71 GCOVHA461WRPZ Exhaust cover 1 AS 4-72 GCOVHA462WRPZ Lamp cover 1 AS 4-73 GCOVHA466WRWZ Steam cover 1 AP 4-74 LANGQA581WRPZ Noise filter angle 1 AS 4-75 LANGQA595WRPZ Radiation plate 1 AS 4-76 PCUSGA586WREZ Cushion 1 AC 4-77 PCUSGA607WREZ Cushion 1 AF 4-78 PCUSGA626WRPZ Cushion 1 AG 4-79 PCUSGA627WRPZ Cushion 1 AG 4-80 PCUSUA237WRP0 Cushion 3 AF 4-81 PCUSUA424WRP0 Cushion 1 AG 4-82 PCUSUA616WREZ Cushion 1 AE 4-83 PPACGA218WRPZ Cushion 2 AG

DOOR PARTS

∆

5 CDORFA994WRKZ Door assembly 1 BZ

∆

5- 1 DDORFB092WRYZ Door panel assembly 1 BR 5- 2 JHNDPA225WREZ Door handle 1 BF

R-8000G

Page 48

R-8000G

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

5- 3 LHLD-A258WRFZ Handle holder R 1 AR 5- 4 LHLD-A259WRFZ Handle holder L 1 AR 5- 5 PCUSGA588WRPZ Cushion 2 AH

∆

5- 6 GCOVHA439WRFZ Choke cover 1 AR

∆

5- 7 GWAKPA924WRFZ Door frame 1 BD 5- 8 HDECAA230WRPZ Stainless cover 1 AY 5- 9 HDECQA227WRTZ Door decoration 1 AT 5-10 LANGKA989WRPZ Glass mounting angle A 2 AG 5-11 LANGKA990WRPZ Glass mounting angle B 1 AQ

∆

5-12 LSTPPA224WREZ Latch head Right 1 AH

∆

5-13 LSTPPA225WREZ Latch head Left 1 AH 5-14 MSPRCA149WREZ Handle spring 2 AE 5-15 PGLSPA577WREZ Front door glass 1 AX 5-16 PGLSPA578WREZ Middle door glass 1 AU 5-17 MLEVFA089WRWZ Handle lever 2 AM 5-18 MSPRCA137WREZ Latch spring Right 1 AC 5-19 MSPRCA138WREZ Latch spring Left 1 AC 5-20 XEPSD40P08000 Screw : 4mm x 8mm 16 AB 5-21 XEPSD40P20000 Screw : 4mm x 20mm 6 AB 5-22 LPIN-A179WREZ Handle pin 2 AG 5-23 LX-BZ0139WRE0 Special screw 2 AA 5-24 PPACGA224WRPZ Cushion 2

MISCELLANEOUS

6- 1 FAMI-A120WRYZ High rack assembly 1 AX 6- 2 FAMI-A121WRYZ Low rack assembly 1 AX 6- 3 FROLPA105WRYZ Turntable support 1 AX 6- 4 NTNT-A113WRHZ Turntable tray 1 AU 6- 5 TLABMA942WRRZ Menu label 1 AL 6- 6 TMAPCA769WRRZ Schematic diagram 1 AL 6- 7 TINSEB012WRRZ Instruction book 1 AP 6- 8 TLABNA964WRRZ Recipe sheet 1 AL 6- 9 FW-VZB994WREZ Main wire harness 1 BK 6-10 FW-VZB995WREZ Thermistor harness 1 AU 6-11 LBSHCA012WRE0 Cord bushing 1 AD 6-12 LHLDWA060WREZ Wire holder 1 AF 6-13 TCAUAA285WRRZ Monitor caution 1 AF 6-14 TCAUAA166WRR0 DHHS caution label 1 AB 6-15 TCAUAA276WRRZ User caution label 1 AH 6-16 PZET-A011WRE0 Thermal insulator 1 AA 6-17 LHLDWA029WRE0 Cord holder 1 AB 6-18 LHLDWA013WRE0 Purse lock LL 2 AC 6-19 TCAUAA286WRRZ Lamp caution 1 AH 6-20 TCAUZA005WRRZ Caution sheet 1 AF

SCREWS NUTS AND WASHERS

7- 1 XNEUW40-32000 Nut: 4mm x 3.2mm 4 AA 7- 2 XOTWW40P08000 Screw : 4 mm x 8 mm 51 AB 7- 3 XBTSD40P06000 Screw : 4 mm x 6 mm 6 AA 7- 4 XHPSD40P08K00 Screw : 4 mm x 8 mm 7 AC 7- 5 XHTSD40P08RV0 Screw : 4mm x 8mm 2 AA 7- 6 XWSUW40-10000 Washer : 4mm x 1.0mm 2 AA 7- 7 XOTSD40P08000 Screw : 4mm x 8mm 23 AA 7- 8 XOTSD40P12000 Screw : 4mm x 12mm 14 AA 7- 9 LX-BZA148WREZ Special screw 11 AC 7-10 LX-BZA149WREZ Special screw 8 AE 7-11 LX-EZA060WREZ Special screw 4 AC 7-12 XOTSD40P10000 screw : 4mm x 10mm 16 AA 7-13 XHTSD40P08000 Screw : 4mm x 8mm 7 AA 7-14 LX-BZA144WREZ Special screw 4 AB 7-15 XOTSD40P12RV0 Screw : 4mm x 12mm 4 AA 7-16 LX-BZA143WREZ Special screw 11 AB 7-17 LX-BZA146WREZ Special screw 7 AC 7-18 XEPSD30P10000 Screw : 3 mm x 10 mm 3 AA 7-19 LX-CZ0052WRE0 Special screw 2 AA 7-20 LX-BZA147WREZ Special screw 4 AC 7-21 XHPSD40P12KS0 Screw : 4mm x 12mm 4 AE 7-22 XONSC40P10000 Screw : 4mm x 10mm 1 AA 7-23 XOTSE40P08000 Screw : 4mm x 8mm 4 AA

Page 49

HOW TO ORDER REPLACEMENT PARTS

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

1. MODEL NUMBER 3. PART NO.

2. REF. NO. 4. DESCRIPTION

Order Parts from the authrized SHARP parts Distributor for your area.

Defective parts required return should be returned as indicated in the Service Policy.

PACKING AND ACCESSORIES

TRAY HOLDER

SPADFA530WREZ

6-4 TURNTABLE TRAY

DOOR PROTECTION SHEET

SPADPA620WREZ

TRAY PROTECT

(SPADPA629WREZ)

R-8000G

CAUTION SHEET

TCAUZA005WRRZ

TOP PAD ASSEMBLY

FPADBA549WRKZ

PLASTIC BAG

SSAKHA075WREZ

6-7 INSTRUCTION BOOK

6-5 MANU LABEL

6-8 RECIPE SHEET

6-2 LOW RACK

6-1 HIGH RACK

6-3 TURNTABLE SUPPORT

TRAY PAD

SPADPA621WREZ

Not replaceable items.

MICROWAVE OVEN

BOTTOM PAD ASSEMBLY

FPADBA550WRKZ

PACKING CASE

SPAKCD991WREZ

Page 50

R-8000G

7-8

6-14

2-4

4-1

4-56

4-36

4-59

7-12

1-8

1-25

4-60

7-10

4-60

4-68

4-40

1-11

7-7

7-1

7-6

7-7

4-47

7-4

7-10

1-10

4-15

4-77

1-17

1-14

7-17

1-19

7-9

4-81

7-7

7-8

4-72

6-19

6-6

4-45

2-1

7-23

4-78

7-22

7-23

1-18

7-9

4-25

4-63

7-9

7-2

7-12

7-17

4-26

1-16

4-64

7-2

4-21

7-2

1-5

7-17

7-2

7-20

6-12

7-9

4-75

7-2

4-79

4-37

4-13

4-30

7-12

4-55

7-2

7-19

4-12

7-2

7-7

7-16

1-4

7-16

4-35

4-52

7-2

4-69

1-13

6-13

1-21

7-13

4-32

4-10

7-13

7-7

4-39

4-59

6-4

7-14

4-70

4-7

4-11

6-3

7-4

7-7

4-38

7-8

2-3

4-29

2-2

7-12

7-8

7-13

7-7

7-17

1-15

4-64

7-7

4-47

7-21

4-73

4-7

2-5

4-41

4-29

4-51

4-49

4-46

7-2

7-4

4-80

7-13

7-4

4-53

7-5

7-12

4-23

7-11

4-48

4-74

1-2

1-12

7-2

7-10

4-16

7-2

1-3

4-9

7-14

7-2

4-22

1-22

1-24

4-42

4-50

7-21

7-12

7-10

7-7

4-54

7-8

7-7

7-8

7-12

4-33

4-34

4-67

7-4

4-5

4-76

7-19

4-24

6-15

7-4

1-7

4-14

7-1

7-12

4-83

4-80

4-28

4-31

1-8

7-13

7-5

7-15

4-2

3-1

7-18

7-8

6-11

1-9

7-9

7-7

4-71

7-7

7-3

1-6

6-17

7-9

4-58

4-3

4-82

4-80

4-19

4-18

7-3

4-20

4-66

1-23

4-27

4-65

4-57

4-17

7-8

1-20

4-62

4-61

1-1

4-4

4-6

4-43

1-12

1-1

4-8

4-44

OVEN AND CABINET PARTS

Page 51

R-8000G

3-4-1

3-4-2

3-9

3-6

3-7

3-10

3-8

3-3

3-4

3-10

3-2

3-4-3

3-10

x11

Actual wire harness may be different than illustration.

POSITION OF PURSE LOCK

6-18 Purse lock LL

Main wire harness

Touch control transformer

Harness assembly

Power unit

3-5

3-4-4

1-23

5-2

5-8

5-9

5-7

5-15

5-5

5-10

5-20

x10

5-10

5-11

5-1

5-20

5-14

5-23

5-19

5-13

5-20

5-21

5-6

5-21

5-12

5-18

5-23

5-22

5-17

5-20

5-24

5-16

5-21

6-1

6-16

6-18

6-2

6-9

6-10

5-14

5-22

5-17

5-4

5-3

MISCELLANEOUS

CONTROL PANEL PARTS

DOOR PARTS

Page 52

R-8000G

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.

'04 SHARP CORP. (1S1.700E) Printed in U.S.A

SHARP R8000G Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

BEFORE SERVICING

WARNING TO SERVICE PERSONNEL

MICROWAVE MEASUREMENT PROCEDURE

SPECIFICATION

GENERAL INFORMATION

OVEN DIAGRAM

OPERATION

SCHEMATIC DIAGRAM

DESCRIPTION AND FUNCTION OF COMPONENTS

TROUBLESHOOTING GUIDE

A MAGNETRON ASSEMBLY TEST

TEST PROCEDURES

B POWER TRANSFORMER TEST

C HIGH VOLTAGE RECTIFIER TEST

D HIGH VOLTAGE CAPACITOR TEST

E SECONDARY INTERLOCK SWITCH/ 3RD. LATCH SWITCH TEST

F PRIMARY INTERLOCK SYSTEM TEST

Monitor switch

H BLOWN MONITOR FUSE

I BLOWN FUSE F10A

J MAGNETRON TEMPERATURE FUSE TEST

K THERMAL CUT-OUT (TOP HEATER) TEST

L THERMAL CUT-OUT (SIDE HEATER) TEST

M TOP HEATING ELEMENT TEST

N SIDE HEATING ELEMENT TEST

O THERMISTOR TEST

P JET MOTOR CAPACITOR TEST

Q JET MOTOR TEST

R CHECKING TEMPERATURE IN THE CONVECTION MODE

S NOISE FILTER TEST

T TOUCH CONTROL PANEL ASSEMBLY TEST

U TACT SWITCH TEST

V RELAY TEST

W SOLID-STATE RELAY TEST

X EXPRESS DEFROST TEST

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

DESCRIPTION OF LSI (IC-1)

Memory Processor (IC-2)

TOUCH CONTROL PANEL SERVICING

PRECAUTIONS FOR USING LEAD-FREE SOLDER

PROCEDURE FOR CHECKING/ SETTING TOTAL OPERATION TIME

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING AGAINST HIGH VOLTAGE:

WARNING FOR WIRING

OUTER CASE REMOVAL

OVEN LAMP AND LAMP SOCKET REMOVAL

TERMINAL INSULATOR REPLACEMENT

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

POWER SUPPLY CORD REPLACEMENT

BACK PLATE REMOVAL

POWER TRANSFORMER REMOVAL

MAGNETRON REMOVAL

HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

FAN MOTOR REMOVAL

SOLID-STATE RELAY REMOVAL

SIDE HEATING ELEMENT REMOVAL

JET MOTOR REMOVAL

TOP HEATING ELEMENT REMOVAL

TURNTABLE MOTOR REMOVAL

DOOR REPLACEMENT AND ADJUSTMENT

DOOR DISASSEMBLY

CONTROL PANEL ASSEMBLY, CPU UNIT AND CONTROL UNIT REMOVAL

SERVICE MAINTENANCE CLEANING

PARTS LIST

HOW TO ORDER REPLACEMENT PARTS

PACKING AND ACCESSORIES

OVEN AND CABINET PARTS