Sharp R-820BW User Manual

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SER VICE MANU AL

S5812R820BPW/

DOUBLE GRILL

CONVECTION

MICROWAVE OVEN

R-820BK R-820BW

MODELS

R-820BK R-820BW

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

GRILL

CONVECTION

Iinteractive

CUSTOM

HELP

PIZZA

GRILL

BAKE

COMPU

ROAST

COOK

DEFROST

CONVEC

GRILL ROAST

POPCORN

MINUTE

REHEAT

12345

100˚ F 150˚ F 275˚ F 300˚ F 325˚ F

6789O

350˚ F 375˚ F 400˚ F 425˚ F 450˚ F

KITCHEN

POWER

CLOCK

TIMER

LEVEL

STOP

START

CLEAR

TOUCH ON

COOK HELP

PLUS

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..)

TABLE OF CONTENTS

Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING 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 .................................................................................................................................24

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................30

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

POWER UNIT CIRCUIT ......................................................................................................................................38

CPU UNIT CIRCUIT ............................................................................................................................................39

PRINTED WIRING BOARD .................................................................................................................................40

PARTS LIST ........................................................................................................................................................41

PACKING AND ACCESSORIES .........................................................................................................................43

SHARP CORPORATION

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

R-820BK R-820BW

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

(a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

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

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

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

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

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

performed on each oven prior to releasing oven 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.

WARNING TO SERVICE PERSONNEL

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

Don't Touch ! Danger High Voltage

R-820BK R-820BW

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 highvoltage capacitor (that is the connecting lead of the highvoltage 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 reexamine the connections to the component being tested.

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

R-820BK R-820BW

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.

SERVICE MANUAL

R-820BK R-820BW

DOUBLE GRILL

CONVECTION

MICROWAVE OVEN

R-820BK / R-820BW

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-820BK, R-820BW.

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.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

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.

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

PARTS LIST

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

R-820BK R-820BW

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts

12.5 Amperes (Microwave) / 13.0 Amperes (Grill/ Convection) 60 Hertz / Single phase, 3 wire grounded

Power Output 900 watts (IEC 705 Test Procedure)

Operating frequency of 2450MHz Top Heater Power Output 1000 Watts Top & Bottom Heater Power Output 1500 Watts Case Dimensions Width 20-1/2" Height 12-1/8" Depth 19-3/4" Cooking Cavity Dimensions

(0.9 Cubic Feet ) Control Complement Touch Control System

Width 13-7/8" Height 7-1/2" Depth 14-1/2"

Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI...........................................Full power throughout the cooking time

P-90 ............................................................. approx. 90% of Full Power

P-80 ............................................................. approx. 80% of Full Power

P-70 ............................................................. approx. 70% of Full Power

P-60 ............................................................. approx. 60% of Full Power

P-50 ............................................................. approx. 50% of Full Power

P-40 ............................................................. approx. 40% of Full Power

P-30 ............................................................. approx. 30% of Full Power

P-20 ............................................................. approx. 20% of Full Power

P-10 ............................................................. approx. 10% of Full Power

P-0 ............................................. No power throughout the cooking time

Grill Cooking (GRILL)........Top and Bottom Grill Mode / Top Grill Mode only

Convection Cooking (CONVEC) .......................... 100 - 450˚F Temp. control

Roast Cooking (ROAST).......................... 325˚F with 30% microwave power

CUSTOM HELP pad, COMPU COOK/ BAKE/ PIZZA/ GRILL/ ROAST pads

COMPU DEFROST pad, CONVEC pad, GRILL pad, ROAST pad

POPCORN pad, REHEAT pad, MINUTE PLUS pad

Number and temperature selection pads, KITCHEN TIMER pad, CLOCK pad

STOP/CLEAR pad, POWER LEVEL pad, START / TOUCH ON pad

Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized

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

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

This oven is equipped with a three prong 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 the 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 115 -120 volt 60 Hz, AC only, 15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

A short power-supply cord is provided to reduce risks of becoming

entangled in or tripping over a longer cord. Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.

3-Pronged Plug

Grounding Pin

Grounded Receptacle Box

R-820BK R-820BW

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-

MOVE THE ROUND GROUNDING PRONG FROM THIS PLUG.

OVEN DIAGRAM

1. Oven light

2. Top heaters (Grill heaters)

3. Oven door with see through window

4. Door hinges

5. Safety door latches

6. Door seals and sealing surfaces

7. Bottom heater

8. Oven cavity

9. Turntable motor shaft

10.Ventilation openings

11.Waveguide cover

12.One touch door opening button

13.Auto-Touch control panel

14.Time display

15.Power supply cord

support

16.Outer cabinet

17.Menu label

Bottom  heater

NOTE:

1. Ensure that the bottom heater is in the lowest position as shown in the figure, as it is possible to move it up and down to help with cleaning.

2. Place the turntable support over the turntable motor shaft on the floor of the cavity.

3. Then place the turntable onto the turntable support.

Turntable Turntable

Turntable  motor shaft

Rack

3-Pronged Receptacle

TOUCH CONTROL PANEL

Iinteractive

CUSTOM

PIZZA GRILL

BAKE ROAST

COMPU

HELP

COOK

HELP

COOK

CONVEC

POPCORN

12345

100˚ F 150˚ F 275˚ F 300˚ F 325˚ F

6789O

350˚ F 375˚ F 400˚ F 425˚ F 450˚ F

KITCHEN

TIMER

STOP

CLEAR

DEFROST

GRILL ROAST

REHEAT

CLOCK

MINUTE

PLUS

POWER

LEVEL

START

TOUCH ON

R-820BK R-820BW

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

OFF CONDITION

Closing the door activates door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 120 volts A.C. is supplied to the control unit. (Figure O-1).

1. The display will show , , , , , , , ,

and . To set any program or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and " : " will appear.

MICROWAVE COOKING CONDITION

Program desired cooking time by touching the NUMBER pads. Program the power level by touching the POWER LEVEL pad and then a Number 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-2 Power transformer RY-5 Fan motor RY-6 Oven lamp/ Turntable motor

2. 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.1 volts A.C. output on the filament winding, and approximately 2260 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 feedbox, 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, secondary interlock switch, relay (RY5), relay (RY6) and primary interlock relay(RY2) 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 electrically monitors the operation of

the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence.

(1)

When the door opens from the closed position, the (RY5)

, primary interlock relay(RY2) and secondary interlock switch open their contacts. And contacts of the relay(RY6) remains closed. Then the monitor switch contacts close.

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

monitor switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch close. And contacts of the relay(RY6) open.

If the secondary interlock switch and primary interlock relay (RY2) fail with the contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, secondary interlock switch, relay(RY6) and primary interlock relay(RY2), causing the monitor fuse to blow.

relay

POWER LEVEL P-0 TO P-90 COOKING

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

VARI-MODE ON TIME OFF TIME Power 10(P-HI) 32 sec. 0 sec.

(100% power) Power 9(P-90) 30 sec. 2 sec.

(approx. 90% power) Power 8(P-80) 26 sec. 6 sec.

(approx. 80% power) Power 7(P-70) 24 sec. 8 sec.

(approx. 70% power) Power 6(P-60) 22 sec. 10 sec.

(approx. 60% power) Power 5(P-50) 18 sec. 14 sec.

(approx. 50% power) Power 4(P-40) 16 sec. 16 sec.

(approx. 40% power) Power 3(P-30) 12 sec. 20 sec.

(approx. 30% power) Power 2(P-20) 8 sec. 24 sec.

(approx. 20% power) Power 1(P-10) 6 sec. 26 sec.

(approx. 10% power) Power 0(P-0) 0 sec. 32 sec.

(0% power)

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

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

GRILL COOKING CONDITIONS

The oven has two grill cooking conditions. They are the TOP HEATER mode and TOP AND BOTTOM HEATER mode.

R-820BK R-820BW

TOP AND BOTTOM HEATER MODE In this mode, the food is cooked by both the top heaters and

bottom heater. Press the GRILL pad and number "1" pad and then enter the cooking time by pressing the number pads. When the START pad is pressed, the following operations occur (Figure O-3a):

1. The relays(RY3, RY4, RY5 and RY6) are energized.

2. The numbers of the digital read-out start the count down to zero.

3. Then the top heaters, bottom heater, turntable motor, oven lamp and fan motor are energized.

4. Now, the food is grilled by the top heaters and the bottom heater.

5. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays(RY3, RY4 and RY6) are opened, then the top heating elements, bottom heating element, turntable motor and oven lamp are deenergized. But the relay(RY5) stays closed and the fan motor operates for 5 minutes. But if the cooking time is less than 2 minutes the relay(RY5) will not stay closed.

NOTE: If the total grill cooking time is beyond 35 minutes,

the relay(RY1) is energized and the convection motor is energized.

TOP HEATER MODE In this mode, the food is cooked by the top heaters. Press the

GRILL pad and number "2" pad and then enter the cooking time by pressing the number pads. When the START pad is pressed, the following operations occur (Figure O-3b):

1. The relays(RY3, RY5 and RY6) are energized.

2. The numbers of the digital read-out start the count down to zero.

3. Then the top heaters, turntable motor, oven lamp and fan motor are energized.

4. Now, the food is grilled by the top heaters.

5. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays(RY3 and RY6) are opened, then the top heaters, turntable motor and oven lamp are de-energized. But the relay(RY5) stays closed and the fan motor operates for 5 minutes. But if the cooking time is less than 2 minutes the relay(RY5) will not stay close.

NOTE: If the total grill cooking time is beyond 35 minutes,

the relay(RY1) is energized and the convection motor is energized.

CONVECTION COOKING CONDITION WITH PREHEAT

Touch the CONVEC pad and select the convection with preheat mode by touching the number "1" pad.

1. Program desired convection temperature by touching the Temperature pad. Enter the cooking time by touching the number pads. When the START pad is touched, the following operations occur:

PREHEATING CONDITION

2. The coil of shut-off relays (RY5 and RY6) are energized, the oven lamp, cooling fan motor and turntable motor are turned on.

3. The coil of relays(RY3 and RY4) are energized by the control unit, and the top heaters and the bottom heater

work with 100% power. The relay(RY1) and the convection motor are not energized at this preheating condition.

NOTE: If the cavity temperature is lower than 100˚F(38C) at

4 minutes and 15 seconds after the preheat is started, the control unit judges that the thermistor is opened. And the oven is stopped.

4. When the oven temperature reaches the selected preheat temperature, the following operations occur: 4-1 The relays(RY3 and RY4) are de-energized by the

control unit temperature circuit and thermistor, opening the circuit to the heating element.

4-2. The oven will continue to function for 30 minutes,

turning the top heaters and the bottom heater on and off, as needed to maintain the selected preheat temperature. The oven will shutdown completely after 30 minutes

CONVECTION TIME COOKING CONDITION

5. When the preheat temperature is reached, a beep signal will sound indicating that the holding temperature has been reached in the oven cavity. Open the door and place the food to be cooked in the oven. When the START pad is touched, the following operations occur:

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

7. The relays(RY1, RY5 and RY6) are energized and the oven lamp, turntable motor, cooling fan motor and convection motor are energized.

8. The relays(RY3 and RY4) are energized (if the cavity temperature is lower than the selected temperature) and the main supply voltage is applied to the heating element to return to the selected cooking temperature. The top heaters and the bottom heater work in accordance with the following table while the heaters are energized.

Selected Temp- Top Heaters Bottom Heaters erature (˚F) Power (%) Power (%)

100 20 10(after 3min. 0%) 150 20 10 275 40 40 300 40 50 325 50 50 350 50 60 375 60 60 400 60 70 425 70 70 450 70 80

9. Upon completion of the cooking time, the audible signal will sound, and oven lamp, turntable motor, cooling fan motor and convection motor are de-energized. At the end of the convection cycle, if the cavity air temperature is above 250˚F(120˚C), the circuit to RY5 will be maintained (by the thermistor circuit) to continue operation of the cooling fan motor until the temperature drops below 220˚F(104˚C), at which time the relay will be deenergized, turning off the fan motor. Relay RY1 will however, open as soon as the convection cycle has ended, turning off the convection fan motor.

R-820BK R-820BW

ROAST COOKING CONDITION

Touch the ROAST pad once. And then program desired cooking time by touching the number pads. The ROAST pad is preprogrammed for 325˚F with 30% microwave power.

NOTE: The microwave power can not be changed. To

change the temperature, touch the ROAST pad twice. When the display says "SELECT TEMP",

touch desired temperature pad. When the START pad is pressed, the following operations occur:

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

2. The shut-off relays(RY1, RY5 and RY6) are energized,

turning on the oven lamp, turntable motor, cooling fan motor and convection motor.

3. The microwave relay(RY2) is energized for 16 seconds

within a 48 second time base.

4. The heater relays(RY3 and RY4) are energized

intermittently within a 48 second time base. The power output is set in accordance with the following table.

Selected Temp- Top Heaters Bottom Heaters erature (˚F) Power (%) Power (%)

100 20 40 150 30 50 275 50 60 300 60 70 325 70 70 350 70 70 375 70 70 400 70 70 425 70 70 450 70 70

5. The microwave relay(RY2) and the heater relays(RY3

and RY4) are not energized simultaneously.

ON/OFF TIME RATIO

In grill cooking, convection cooking or roast cooking, the top heaters, bottom heater or magnetron operate whithin a 48 second time base. The following table is the ON / OFF time ratio at each power output of the top heaters, bottom heater or magnetron.

POWER OUTPUT ON TIME OFF TIME

100% 48 sec. 0 sec.

90% 44 sec. 4 sec. 80% 40 sec. 8 sec. 70% 36 sec. 12 sec. 60% 32 sec. 16 sec. 50% 26 sec. 22 sec. 40% 22 sec. 26 sec. 30% 16 sec. 32 sec. 20% 12 sec. 36 sec. 10% 8 sec. 40 sec.

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 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 700mV 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, oven lamp and turntable motor. The LSI also stops counting down. Please refer to the following section for a more detailed description.

Operation

Please refer to the timing diagrams below.

1. 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 one (21) seconds after the thermistor is cut off the LSI turns on the cooling fan for six (6) seconds.

2. 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 700mV 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, oven lamp and turntable motor. The LSI also stops counting down.

3. 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.

0 2 32 64 (sec.)

3 sec.

THERMISTOR

SENSING

VOLTAGE

OFF

Sensing the voltage across temperature  measurement circuit.

R-820BK R-820BW

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. : OR CLOCK APPEAR ON DISPLAY.

SCHEMATIC

~ 60Hz

120V

BRNBLU

LIVENEUTRAL

EARTH

G-Y



THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

NOTE: Indicates components with potential above 250 V.

N.O.

COM.

CONTROL UNIT

COM.

TTM

RY3

COM.

TURNTABLE 

MOTOR

DOOR

SENSING

SWITCH

THERMISTOR

CONVECTION

SECONDARY INTERLOCK SWITCH

RY1

MOTOR

RY5

FAN MOTOR

RY6

RPIMARY

INTERLOCK RELAY

RY2:

N.O.

OVEN LAMP

Figure O-1 Oven Schematic-OFF Condition

RY4

COM.

N.O. N.O.

BOTTOM HEATER

POWER 

TRANSFORMER

MONITOR SWITCH

GRILL HEATER (TOP)

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

~ 60Hz

120V

SCHEMATIC

LIVENEUTRAL

BRNBLU

G-Y

EARTH



THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

DOOR

SENSING

SWITCH

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. MICROWAVE POWER LEVEL PAD PRESSED ONCE(100%).

3. COOKING TIME PROGRAMMED.

4. START PAD TOUCHED.

Figure O-2 Oven Schematic-Microwave cooking Condition

CONTROL UNIT

THERMISTOR

SECONDARY INTERLOCK SWITCH

RY5

RY1

CONVECTION

MOTOR

FAN MOTOR

RY6

N.O.

OVEN LAMP

N.O.

COM.

RPIMARY

INTERLOCK RELAY

RY2:

COM.

TTM

TURNTABLE 

RY3

COM.

MOTOR

RY4

COM.

N.O. N.O.

BOTTOM HEATER

POWER 

TRANSFORMER

MONITOR SWITCH

GRILL HEATER (TOP)

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

R-820BK R-820BW

BRNBLU

SCHEMATIC

LIVENEUTRAL

EARTH

G-Y



THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. GRILL PAD TOUCHED.

3. NUMBER "1" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. START PAD TOUCHED.

~ 60Hz

120V

Figure O-3a Oven Schematic-Grill cooking Condition (TOP AND BOTTOM HEATER mode)

DOOR

SENSING

SWITCH

CONTROL UNIT

THERMISTOR

SECONDARY INTERLOCK SWITCH

NOTE: Indicates components with potential above 250 V.

N.O.

COM.

N.O. N.O.

RY4

COM.

TTM

RY3

COM.

TURNTABLE 

MOTOR

GRILL HEATER (TOP)

BOTTOM HEATER

RY5

RY1

CONVECTION

MOTOR

FAN MOTOR

RY6

N.O.

OVEN LAMP

RPIMARY

INTERLOCK RELAY

RY2:

POWER 

TRANSFORMER

MONITOR SWITCH

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

BRNBLU

SCHEMATIC

LIVENEUTRAL

EARTH

G-Y



THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. GRILL PAD TOUCHED.

3. NUMBER "2" PAD TOUCHED.

4. COOKING TIME PROGRAMMED.

5. START PAD TOUCHED.

~ 60Hz

120V

DOOR

SENSING

SWITCH

CONTROL UNIT

THERMISTOR

SECONDARY INTERLOCK SWITCH

RY5

RY1

CONVECTION

MOTOR

FAN MOTOR

RY6

N.O.

OVEN LAMP

N.O.

COM.

RPIMARY

INTERLOCK RELAY

RY2:

COM.

TTM

TURNTABLE 

RY3

COM.

MOTOR

RY4

COM.

N.O. N.O.

BOTTOM HEATER

POWER 

TRANSFORMER

MONITOR SWITCH

GRILL HEATER (TOP)

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

Figure O-3b Oven Schematic-Grill cooking Condition (TOP HEATER mode)

R-820BK R-820BW

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. CONVECTION PAD TOUCHED.

3. NUMBER "1" PAD TOUCHED.

4. TEMPERATURE PAD TOUCHED.

5. COOKING TIME PROGRAMMED.

6. START PAD TOUCHED.

SCHEMATIC

~ 60Hz

120V

BRNBLU

LIVENEUTRAL

EARTH

G-Y



Figure O-4 Oven Schematic-Convection cooking Condition (Convection with preheat mode)

THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

DOOR

SENSING

SWITCH

CONTROL UNIT

THERMISTOR

SECONDARY INTERLOCK SWITCH

RY5

RY1

CONVECTION

MOTOR

FAN MOTOR

RY6

N.O.

OVEN LAMP

N.O.

COM.

RPIMARY

INTERLOCK RELAY

RY2:

COM.

TTM

TURNTABLE 

RY3

COM.

MOTOR

RY4

COM.

N.O. N.O.

BOTTOM HEATER

POWER 

TRANSFORMER

MONITOR SWITCH

GRILL HEATER (TOP)

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

NOTE: CONDITION OF OVEN

1. DOOR CLOSED.

2. ROAST PAD TOUCHED.

3. COOKING TIME PROGRAMMED.

4. START PAD TOUCHED.

SCHEMATIC

~ 60Hz

120V

BRNBLU

LIVENEUTRAL

EARTH

G-Y



NOTE: The microwave relay (RY2) and the heater relay (RY3 or RY4) are not energized

THERMAL CUT-OUT (OVEN)

FUSE 20A

THERMAL CUT-OUT (MAG.)

simultaneously.

N.O.

COM.

CONTROL UNIT

DOOR

SENSING

SWITCH

THERMISTOR

SECONDARY INTERLOCK SWITCH

CONVECTION

RY1

MOTOR

RY5

FAN MOTOR

RY6

RPIMARY

INTERLOCK RELAY

RY2:

N.O.

OVEN LAMP

COM.

TTM

RY3

COM.

TURNTABLE 

MOTOR

N.O. N.O.

RY4

COM.

Figure O-5 Oven Schematic-Roast cooking Condition

MONITOR SWITCH

GRILL HEATER (TOP)

BOTTOM HEATER

POWER 

TRANSFORMER

CAPACITOR

0.94µF

AC2200V

MAGNETRON

H.V. RECTIFIER

R-820BK R-820BW

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Latch

Latch Hook

Heads



Door Sensing  Switch

Door

Switch Lever

Monitor Switch

Secondary Interlock Switch

Figure D-1. Door Open Mechanism

DOOR SENSING AND SECONDARY INTERLOCK SWITCHES

The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the power to all high voltage components. 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.

of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), RELAY (RY6), 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.

TURNTABLE MOTOR

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

COOLING FAN MOTOR

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

MONITOR FUSE

1. The monitor fuse blows when the contacts (COM-NO) of the primary interlock relay (RY2) and secondary interlock switch remain closed with the oven door open and when the monitor switch closes.

2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric shock or fire hazard.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative, by means of blowing the monitor fuse, when the contacts of the primary interlock relay (RY2) and secondary interlock switch fail to open when the door is opened.

Functions:

1. When the door is opened, the monitor switch contacts close (to the ON condition) due to their being normally closed. At this time the primary interlock relay (RY2) and secondary interlock switch 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 (RY2) and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing

THERMAL CUT-OUT 125˚C (MAGNETRON)

This thermal cut-out protects the magnetron against overheating. If the temperature goes up higher than 257˚F (125˚C) because the fan motor is interrupted or the ventilation openings are blocked, the thermal cut-out will open and line voltages to the high voltage transformer will be cut off and the operation of the magnetron will be stopped. The thermal cut-out will not resume.

THERMAL CUT-OUT 170˚C (OVEN)

The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the food in the oven catch fire due to over heating produced by improper setting of the cooking time or failure of control unit. Under the normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 338˚F(170˚C) causing the oven to shut down. The thermal cut-out will close in at 311˚F(155˚C).

TOP HEATERS

The top heaters are located on the top of the oven cavity assembly. The top heaters send out heat to grill foods.

R-820BK R-820BW

BOTTOM HEATER

The bottom heater is located on the floor of the oven cavity assembly. The bottom heater sends out heat to grill foods.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where food is not directly heated by the top heaters and the bottom heater, but is heated by forced circulation of the hot air produced by the top heaters and the bottom heater. The air heated by the top heaters and the bottom heater 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 convection motor. It then enters the inside of the oven through the vent holes provided on the left side 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 rear wall.

Most of this hot air is reheated by the top heaters and the bottom heater and 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 top heaters and the bottom heater are de-energized. When the temperature inside the oven cavity drops below the selected temperature, the top heaters and the bottom heater 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 top heaters and the bottom heater are de-energized and the convection fan stops operating and the oven shuts off.

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 (RY6),

primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFSBA021WRK0 as an assembly.

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

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

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

2. Open the door and block it open.

3. Discharge 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.

R-820BK R-820BW

CK = Check / RE = Replace

TEST PROCEDURE

POSSIBLE CASE

AND 

DEFECTIVE PARTS

CONDITION PROBLEM

Monitor fuse blows when power cord is plugged into wall outlet.

Monitor fuse blows when the door is opened.

Oven lamp does not light when door is opened. (Display operates.)

OFF CONDITION

COOKING CONDITION (COMMON MODE)

MICROWAVE  COOKING CONDITION

GRILL COOKING CONDITION

ROAST COOKING CONDITION

CONVECTION COOKING CONDITION

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

"SHARP SIMPLY ..... PRESS CLOCK"

does not appear in display when power cord is plugged into wall outlet.

Display does not operate properly when STOP/CLEAR pad is pressed.

Oven does not start when the START pad is pressed. (Display operates.)

Oven lamp does not light. (Turntable motor operates.)



Fan motor does not operate. (Oven lamp lights.)

Turntable motor does not operate. (Oven lamp lights.)

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

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

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

Oven does not operate properly during variable cooking condition except 100% cooking condition.

Function of COMPU DEFROST does not operate properly.

 Top heaters do not operate. Bottom heater does not operate. Oven seems to be operating but

little or no heat is produced in oven load. (Microwave power does not seem to be generated properly.)

Top heaters do not operate. Bottom heater does not operate. Temperature is lower or higher than

preset. Convection motor does not operate. Oven stops after 4 minutes 15 sec..

ABCDEEFFGH I I JLMNNNNNNOP

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

THERMAL CUT-OUT 170˚C

THERMAL CUT-OUT 125˚C

SECONDARY INTERLOCK SWITCH

PRIMARY INTERLOCK SYSTEM

MONITOR SWITCH

MONITOR FUSE

TOP HEATERS

BOTTOM HEATER

THERMISTOR

TOUCH CONTROL PANEL

KEY UNIT

RELAY RY1

RELAY RY2

RELAY RY3

RELAY RY4

RELAY RY5



RERERERERE

RELAY RY6

COMPU DEFROST

FOIL PATTURN ON P.W.B.

FAN MOTOR

CONVECTION MOTOR

TURNTABLE MOTOR

POWER SUPPLY CORD

OVEN LAMP OR SOCKET

CK CK CK

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

MIS-ADJUSTMENT OF SWITCHES

TEST PROCEDURES

R-820BK R-820BW

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet).

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

9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

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

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

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

COMPONENT TEST

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

2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) 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 22 to 43˚F(12.2 to 23.9˚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 120 volts and the oven cavity is clean.

B POWER TRANSFORMER TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 73 ohms; the resistance of the filament coil should be less than 1 ohm.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

R-820BK R-820BW

TEST PROCEDURES

PROCEDURE

LETTER

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

C HIGH VOLTAGE RECTIFIER TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

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

D HIGH VOLTAGE CAPACITOR TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

E THERMAL CUT-OUT TEST 170˚C (OVEN)

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. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 338˚F(170˚C). The thermal cut-out resets automatically below approximately 311˚F(155˚C). An open thermal cut-out indicates overheating of the oven, check inside of oven cavity for improper setting of cooking time or operation of control unit. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

THERMAL CUT-OUT TEST 125˚C (MAGNETRON)

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. A continuity check across the thermal cut-out terminals should indicate a closed circuit. If the temperature of the magnetron reaches approximately 257˚F(125˚C), the thermal cut-out opens. An open thermal cut-out indicates overheating of the magnetron, exchange the thermal cut-out. Check for restricted air flow to the magnetron, especially the cooling fan air guide.

TEST PROCEDURES

R-820BK R-820BW

PROCEDURE

LETTER

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,

REPLACE THERMAL CUT-OUT.

F SECONDARY INTERLOCK SWITCH TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

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

fan, turntable and oven light will be activated by relay(RY6).

COMPONENT TEST

PRIMARY INTERLOCK RELAY (RY2)

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

G MONITOR SWITCH TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. 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

R-820BK R-820BW

TEST PROCEDURES

PROCEDURE

LETTER

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.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

H BLOWN MONITOR FUSE TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, 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 PRIMARY INTERLOCK

RELAY, 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-BA021WRK0, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

SCREW  DRIVER

RED

WHT

MONITOR  SWITCH

OHMMETER

I TOP HEATERS AND BOTTOM HEATER TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Make sure the heater is cooled completely.

5. Resistance of heater. Disconnect the wire leads to the heater to be tested. Using ohmmeter with low resistance range. Check the resistance across the terminals of the heater as described in the following table.

Table: Resistance of heater

Parts name Resistance Top heaters Approximately 7.2 Ω x 2 = 14.4 Ω Bottom heater Approximately 28.8 Ω

6. Insulation resistance. Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the heater terminal and cavity using a 500V - 100MΩ insulation tester. The insulation resistance should be more than 10 MΩ in the cold start.

7. If the results of above test 5 and/or 6 are out of above specifications, the heater is probably faulty and should be replaced.

8. Reconnect all leads removed from components during testing.

9. Reinstall the outer case (cabinet).

TEST PROCEDURES

R-820BK R-820BW

PROCEDURE

LETTER

COMPONENT TEST

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

11.Run the oven and check all functions.

J THERMISTOR TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect connector-D from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s D1 and D3.

Room Temperature Resistance 68˚F(20˚C) - 86˚F(30˚C) Approx. 293kΩ - 184KΩ

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

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.

K 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 (120 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%.

L TOUCH CONTROL PANEL ASSEMBLY TEST

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

Before testing,

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

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

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

1. Key Unit. NOTE ;

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) Check key unit ribbon connection before replacement.

5) Reconnect all leads removed from components during testing.

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TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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

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

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

a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.

If the key unit is defective.

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Replace the key unit.

5) Reconnect all leads removed from components during testing.

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

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

8) Run the oven and check all functions.

2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure M) to determine if control unit is faulty.

2-1 In connection with pads.

a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal.

2-2 In connection with indicators

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

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

a) Buzzer does not sound or continues to sound. b) Clock does not operate properly. c) Cooking is not possible. d) Proper temperature measurement is not obtained.

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.

M KEY UNIT TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.

TEST PROCEDURES

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PROCEDURE

LETTER

N RELAY TEST

COMPONENT TEST

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

5. Reconnect all leads removed from components during testing.

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

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

8. Run the oven and check all functions.

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

09876

START

TOUCH ON

G12 G11 G10 G 9

POWER

LEVEL

CLOCK

ROAST

MINUTE

PLUS

REHEAT CONVEC

ROAST

DEFROSTKITCHEN

GRILL

PIZZA

GRILL



TIMER

BAKE

COOK



POPCORN



CUSTOM

HELP

STOP

CLEAR

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

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

7. Remove the outer case and check voltage between Pin No. 1 of the 3 pin connector (A) and the common terminal of the relay RY6 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit.

Shut off, Cook and Heater Relay Test

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

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

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

unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 24.0V D.C. Convection motor RY2 Approx. 24.0V D.C. Power transformer RY3 Approx. 24.0V D.C. Grill heaters (Top) RY4 Approx. 24.0V D.C. Bottom heater RY5 Approx. 24.0V D.C. Fan motor RY6 Approx. 24.0V D.C. Oven lamp / Turntable motor

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

9. Open the door and block it open.

10.Discharge high voltage capacitor.

11.Reconnect all leads removed from components during testing.

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

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

14.Run the oven and check all functions.

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TEST PROCEDURES

PROCEDURE

LETTER

O COMPU DEFROST TEST

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 " Compu Defrost " pad once and touch the Number pad "1", and touch the

Number pad 5. And then touch the "START" pad. (3)The oven is in Compu Defrost cooking condition. (4)The oven will operate as follows

WEIGHT

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

LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME

0.5lb 70% 50sec. 0% 1min. 50% 35sec. 30% 45sec.

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

P FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

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

1. Foil pattern check and repairs.

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder. 2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 218Ω ± 10%). If any abnormal condition is detected, replace the defective parts.

(J1)

VRS1

FAN

CN - A

6) Reconnect all leads removed from components during testing.

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

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

9) Run the oven and check all functions.

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

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

5) Ensure that these leads remain isolated from other components and oven chassis by using

insulation tape.

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

7) Follow the troubleshooting guide given below for repair.

TEST PROCEDURES

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PROCEDURE

LETTER

COMPONENT TEST

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between

1 Pin No. 1 of the 3-pin connector (A) and the Check supply voltage and oven power cord.

common terminal of the relay RY6. The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and repair.

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

9) Open the door and block it open.

10) Discharge high voltage capacitor.

11) Reconnect all leads removed from components during testing.

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

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

14) Run the oven and check all functions.

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TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

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

(1) Key Unit (2) Control Unit (The Control unit consists of Power unit and

CPU unit.)

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

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit from P40, P41, P72, P73 P74, P75, P76 and P77. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P44 - P47 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit, relay circuit, temperature measurement circuit, indicator circuit and back light circuit.

1) LSI

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

2) Power Source Circuit

This circuit generates voltage necessary in the control unit.

4) ACL

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

5) Buzzer Circuit

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

6) Door Sensing Switch (Stop Switch)

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

7) Relay Circuit

To drive the magnetron, grill heaters, bottom heater, convection motor, fan motor, turntable motor and light the oven lamp.

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD1

- LD10).

9) Indicator Circuit

This circuit consists of 2line, 7-digits, 45-segments and 5-common electrodes using a Liquid Crystal Display.

10)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.

Symbol Voltage Application

VC -5.2V LSI(IC1)

3) Synchronizing Signal Circuit

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

DESCRIPTION OF LSI

16.7 msec.

H : GND

L (-5V)

LSI(IZA888DR)

The I/O signal of the LSI(IZA888DR) are detailed in the following table.

Pin No. Signal I/O Description

1 C1 IN Terminal not used. 2 VL1 IN Power source voltage input terminal.

Standard voltage for LCD. 3-5 AN7-AN5 IN Heating constant compensation terminal. 6 AN4 IN Terminal not used. 7 AN3 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. 8 AN2 IN Input signal which communicates the door open/close information to LSI.

Door closed; "H" level signal.

Door opened; "L" level signal. 9-10 AN1-AN0 IN Terminal not used. 11 P57 OUT Timing signal output terminal for temperature measurement(OVEN THERMIS-

TOR).

"H" level (GND) : Thermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing. (Convection cooking) 12 P56 OUT Signal to sound buzzer.

A: key touch sound.

B: Completion sound.

C: When the temperature of the oven cav-

ity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is elapsed.

13 P55 OUT Timing signal output terminal for temperature measurement(OVEN THERMIS-

TOR).

"H" level (GND) : Thermistor OPEN timing.

"L" level (-5V) : Temperature measuring timing. (Convection cooking) 14-18 P54-P50 IN/OUT Terminal not used. 19 P47 IN Signal coming from touch key.

When any one of G12 line keys on key matrix is touched, a corresponding signal from

P40, P41, P72, P73, P74, P75, P76 and P77 will be input into P47. When no key is

touched, the signal is held at "L" level. 20 P46 IN Signal similar to P47.

When any one of G11 line keys on key matrix is touched, a corresponding signal will

be input into P46. 21 P45 IN Signal similar to P47.

When any one of G10 line keys on key matrix is touched, a corresponding signal will

be input into P45. 22 P44 IN Signal similar to P47.

When any one of G9 line keys on key matrix is touched, a corresponding signal will

be input into P44. 23 INT1 IN Terminal not used. 24 INT0 IN Signal to synchronized LSI with commercial power source frequency(60Hz).

This is basic timing for time processing of LSI.

1.0 sec

0.1 sec

2.0 sec

1.0 sec H: GND

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25 P41 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G8 line key on matrix is touched.

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Pin No. Signal I/O Description

26 P40 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G7 line key on matrix is touched.

27 P77 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G6 line key on matrix is touched.

28 P76 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G5 line key on matrix is touched.

29 P75 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G4 line key on matrix is touched.

30 P74 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G3 line key on matrix is touched.

31 P73 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G2 line key on matrix is touched.

32 P72 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G1 line key on matrix is touched.

33 P71 OUT Oven lamp and turntable motor driving signal(Square Waveform : 60Hz).

To turn on and off shut-off relay (RY6). The

16.7 msec.

square waveform voltage is delivered to the relay (RY6) driving circuit.

During cooking

34 P70 IN Connected to VC. 35 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.

36 P81 OUT Magnetron high-voltage circuit driving signal.

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

VARI ON TIME OFF TIME P-HI(100% power) 32 sec. 0 sec. P-90(approx. 90% power) 30 sec. 2 sec. P-80(approx. 80% power) 26 sec. 6 sec. P-70(approx. 70% power) 24 sec. 8 sec. P-60(approx. 60% power) 22 sec. 10 sec. P-50(approx. 50% power) 18 sec. 14 sec. P-40(approx. 40% power) 16 sec. 16 sec. P-30(approx. 30% power) 12 sec. 20 sec. P-20(approx. 20% power) 8 sec. 24 sec. P-10(approx. 10% power) 6 sec. 26 sec. P-0(0% power) 0 sec. 32 sec.

37 P80 OUT Grill heaters (TOP HEATER) driving signal.

To turn on and off the grill heaters relay (RY3). "L" level during grill (TOP GRILL, TOP AND BOTTOM) cooking, Convection cooking or Roast cooking, "H" level otherwise. The heater relay turns on and off within a 48 second time base in accordance with the special program in LSI.

Power output ON time OFF time 100 % 48 sec. 0 sec. 90 % 44 sec. 4 sec. 80 % 40 sec. 8 sec. 70 % 36 sec. 12 sec. 60 % 32 sec. 16 sec. 50 % 26 sec. 22 sec. 40 % 22 sec. 26 sec. 30 % 16 sec. 32 sec. 20 % 12 sec. 36 sec. 10 % 8 sec. 40 sec.

38 XIN IN Internal clock oscillation frequency input setting.

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

Pin No. Signal I/O Description

39 XOUT OUT Internal clock oscillation frequency control output.

Output to control oscillation input of XOUT.

40 VSS IN Power source voltage: -5V.

VC voltage of power source circuit input.

41 P27 OUT Bottom heater driving signal.

To turn on and off the bottom relay (RY4). "L" level during grill (TOP AND BOTTOM) cooking, Convection cooking or Roast cooking, "H" level otherwise. The heater relay turns on and off within a 48 second time base in accordance with the special program in LSI.

42 P26 OUT Convection motor driving signal.

To turn on and off shut-off relay(RY1). "L" level during CONVECTION; "H" level otherwise. (Relay RY1 does not turn on at

preheating mode.)

43 P25 OUT Fan motor driving signal.

To turn on and off the fan motor relay RY5. "L" level during cooking, or for 5 minutes after grill

cooking or for a while after convection or roust cooking. "H" level otherwise.

44 P24 OUT Terminal not used. 45 P23 OUT Common data signal: COM5.

Connected to LCD (Pin No. 37)

46-48 P22-P20 OUT Segment data signal.

Connected to LCD. No connection in LCD.

49-50 P17-P16 OUT Segment data signal.

Connecte 0d to LCD. No connection in LCD.

51-80 SEG39-SEG10 OUT Segment data signal.

Connected to LCD. The relation between signals are as follows:

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

SEG 0 (90) ............... SEG45 (51) SEG23 (67) ............SEG17 (17)

SEG 1 (89) ............... SEG44 (50) SEG24 (66) ............SEG16 (16)

SEG 2 (88) ............... SEG43 (49) SEG25 (65) ............SEG15 (15)

SEG 3 (87) ............... SEG42 (48) SEG25 (65) ............SEG15 (32)

SEG 4 (86) ............... SEG41 (47) SEG26 (64) ............SEG14 (14)

SEG 5 (85) ............... SEG40 (46) SEG27 (63) ............SEG13 (13)

SEG 6 (84) ............... SEG39 (45) SEG28 (62) ............SEG12 (12)

SEG 7 (83) ............... SEG38 (44) SEG29 (61) ............SEG11 (11)

SEG 8 (82) ............... SEG37 (43) SEG30 (60) ............SEG10 (10)

SEG 9 (81) ............... SEG31 (31) SEG31 (59) ..............SEG 9 ( 9)

SEG10 (80) .............. SEG30 (30) SEG32 (58) ..............SEG 8 ( 8)

SEG11 (79) .............. SEG29 (29) SEG33 (57) ..............SEG 7 ( 7)

SEG12 (78) .............. SEG28 (28) SEG34 (56) ..............SEG 6 ( 6)

SEG13 (77) .............. SEG27 (27) SEG35 (55) ..............SEG 5 ( 5)

SEG14 (76) .............. SEG26 (26) SEG36 (54) ..............SEG 4 ( 4)

SEG15 (75) .............. SEG25 (25) SEG37 (53) ..............SEG 3 ( 3)

SEG16 (74) .............. SEG24 (24) SEG38 (52) ..............SEG 2 ( 2)

SEG17 (73) .............. SEG23 (23) SEG39 (51) ..............SEG 1 ( 1)

SEG18 (72) .............. SEG22 (22) P16 (50) .................SEG32 (38)

SEG19 (71) .............. SEG21 (21) P17 (49) .................SEG33 (39)

SEG20 (70) .............. SEG20 (20) P20 (48) .................SEG34 (40)

SEG21 (69) .............. SEG19 (19) P21 (47) .................SEG35 (41)

SEG22 (68) .............. SEG18 (18) P22 (46) .................SEG36 (42)

During

cooking

(Convection)

OFF

For 5 minutes after grill, or for a  while after convection or roust.  

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GND

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Pin No. Signal I/O Description

81 SEG9 OUT Segment data signal.

Connected to LCD. No connection in LCD.

82-90 SEG8-SEG0 OUT Segment data signal.

Connected to LCD. Signal is similar to SEG39. 91 VCC IN Connected to GND. 92 VREF IN Connected to GND. 93 AVSS IN Connected to VC. 94 COM3 OUT Common data signal: COM4.

Connected to LCD (Pin No. 36). 95 COM2 OUT Common data signal: COM3.

Connected to LCD (Pin No. 35). 96 COM1 OUT Common data signal: COM2.

Connected to LCD (Pin No. 34). 97 COM0 OUT Common data signal: COM1.

Connected to LCD (Pin No. 33). 98-99 VL3-VL2 IN Power source voltage input terminal.

Standard voltage for LCD. 100 C2 IN Terminal not used.

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 PW boards containing them in aluminium foil.

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

approx. 1M ohm

2. Shapes of Electronic Components

Transistor 2SB1238

3. Servicing of Touch Control Panel

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

(1) Servicing the touch control panel with power

supply of the oven : CAUTION:

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

Therefore, before checking the performance of the touch

control panel,

1) Disconnect the power supply cord, and then remove

outer case.

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

Transistor DTD143ES

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, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if the dummy resistor(s) with resistance equal to that of the controls are used.

(2) Servicing the touch control panel with power

supply from an external power source:

Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to check the sensorrelated controls of the touch control panel by using the dummy resistor(s).

4. Servicing Tools

Tools required to service the touch control panel assembly.

1) Soldering iron: 30W

(It is recommended to use a soldering iron with a grounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC -

10MHz type or more advanced model.

3) Others: Hand tools

5. Other Precautions

1) Before turning on the power source of the control unit,

remove the aluminium foil applied for preventing static electricity.

2) Connect the connector 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.

R-820BK R-820BW

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING AGAINST HIGH VOLTAGE:

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

WARNING:

1. Disconnect the power supply cord.

2. Make sure that a definite "click" can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button 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;

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 followiong parts;

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

2) Hot parts: Oven lamp, Magnetron, High voltage transformer, grill heater, bottom heater and Oven cavity.

1. Door does not close firmly.

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

3. The door gasket or seal is damaged.

4. The door is bent or warped.

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

6. There are defective parts in the microwave 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) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch, Switch lever, Open button.

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

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

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

To remove the outer case, proceed as follows.

1. Disconnect the power supply cord.

2. Open the oven door and block it open.

3. Remove the two (2) screws (LHSTIX screws) holding the back plate to the oven cavity rear plate, by using LHSTIX screw driver (LHSTIX "LR-4").

4. Remove the back plate with the sub back plate.

5. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver.

6. Remove the remaining three (3) screws from rear and along the side edge of case.

7. Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate.

R-820BK R-820BW

8. Lift the entire case from the oven.

9. Discharge the H.V. capacitor before carrying out any further work.

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

CAUTION: 1. DISCONNECT OVEN FROM POWER SUP

PLY BEFORE REMOVING OUTER CASE.

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

NOTE: When replacing the outer case, the 2 special

Torx screws must be reinstalled in the same locations.

POWER TRANSFORMER REMOVAL

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

2. Open the oven door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the filament leads of power transformer from high voltage capacitor and the magnetron.

5. Disconnect the H.V. wire B from the power transformer.

LHSTIX Screw

Outer Case Cabinet

LHSTIX  Screw  Driver(Size LR-4)

Sub Back Plate

Back Plate

Screw Driver (Type: TORX T20 H or  GTXH20-100)

Special  screw

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

7. Remove the two (2) screws holding the transformer to base plate.

8. Remove the transformer.

9. Now the power transformer is free.

HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL

To remove the components, proceed as follows.

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 H.V. wire of the high voltage rectifier assembly from the magnetron.

5. Disconnect all the leads and terminals of high voltage rectifier assembly from the high voltage capacitor.

6. Remove one (1) screw holding earth side terminal of the high voltage rectifier assembly.

Now, the high voltage rectifier assembly should be free.

8. Remove one (1) screw holding capacitor holder to the oven cavity rear plate.

9. Release the capacitor holder from the fan duct.

10.Remove the capacitor from the capacitor holder.

11.Now, the capacitor should be free.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-

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

MAGNETRON REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Release the tabs of air intake duct from the chassis support and the oven cavity.

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

6. Remove the one (1) screw holding the chassis support to the magnetron.

7. Move the air intake duct to the left.

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

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

CAUTION: WHEN REPLACING THE MAGNETRON, BE

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

CONTROL PANEL ASSEMBLY REMOVAL

CONTROL PANEL ASSEMBLY

Disconnect the power supply cord and case.

then

remove outer

2. Open the door and block it open.

3. Discharge high voltage capacitor.

R-820BK R-820BW

4. Disconnect the main wire harness, thermistor harness and the switch harness from the power unit.

5. Straighten the tab of the oven cavity front flange holding the tab of the control panel frame.

6. Lift up the control panel assembly.

7. Now, the control panel assembly is free.

CONTROL UNIT

Disconnect the flat ribbon cable from the connector CN-G.

9. Remove the two (2) screws holding the CPU unit to the control panel frame.

10.Release the four (4) tabs of the control panel frame holding the CPU unit to the control panel frame.

11.Release the liquid crystal display (LCD) from the LCD holder.

12.Now, the LCD sheet is free.

13.Release the two (2) tabs of the LCD holder holding the

OVEN LAMP AND LAMP SOCKET REMOVAL

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. Lift up the oven lamp socket from air intake duct.

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

6. Now, the oven lamp socket is free.

CPU unit to the LCD holder.

14.Remove the LCD holder from the CPU unit.

15.Remove the two (2) screws holding the power unit to the control panel frame.

16.Release the four (4) tabs of the control panel frame holding the power unit to the control panel frame.

17.Now, the control unit (CPU unit + Power unit) is free.

NOTE: 1. Before attaching a new key unit, wipe off remaining

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

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

3. Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flate type small screw driver

Figure C-1. Oven lamp socket

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

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. Push the lever of positive lock® connector.

5. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove the turntable motor cover by snipping of material in four corners.

3. Where the corners have been snipped off, bend corner areas flat. No sharp edge must be evident after removal of turntable motor cover.

4. Disconnect the wire leads from the turntable motor and

Terminal

Positive lock® connector

Lever

Push

Pull down

Figure C-2. Positive lock® connector

remove the two (2) screws holding the turntable motor.

5. Now, the turntable motor is free.

6. After replacement use the one (1) screw provided with the turntable motor assembly to fit turntable motor cover.

NOTE: The one (1) screw to fit the turntable motor cover

should be XFPSD40P12K00, XFPSD40P10K00 or XFPSD40P08K000.

COOLING FAN MOTOR REMOVAL

R-820BK R-820BW

REMOVAL

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 wire leads from the fan motor.

5. Remove the one (1) screw holding the capacitor holder to the oven cavity rear plate.

6. Remove the one (1) screw holding the fan duct to the oven cavity rear plate.

7. Release the tabs of the capacitor holder from fan duct.

8. Remove the fan duct from the oven.

9. Remove the fan blade from the fan motor shaft according to the following procedure.

10.Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.

CAUTION: * Make sure that no metal pieces enter the gap

between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced.

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

because the coil may be cut or injured.

* Do not disfigure the bracket by touching with the

pliers.

11.Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand.

12. Now, the fan blade will be free.

Coil

Groove joint pliers

CAUTION: * Do not reuse the removed fan blade because the

hole (for shaft) may be larger than normal.

13.Remove the two (2) screws holding the fan motor to the fan duct.

14.Now, the fan motor is free.

INSTALLATION

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

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

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

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

CAUTION: * Do not hit the fan blade hard when installing because

the bracket may be disfigured.

* Make sure that the fan blade rotates smooth after

installation.

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

5. Install the fan duct to the oven cavity rear plate with the one (1) screw.

6. Insert the tabs of the capacitor holder to the fan duct.

7. Install the capacitor holder to the oven cavity rear plate with the one (1) screw.

8. Re-connect the wire leads to the fan motor.

Shaft

Stator

Gap Bracket

Rear View

Rotor

Side View

Shaft

Axis

Stator

Rotor

CONVECTION MOTOR REMOVAL

Disconnect the power supply cord and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Now, the back plate with the sub back plate should be removed.

5. Disconnect the wire leads from the convection motor.

6. Remove the two (2) screws holding the conv. thermal cover to the oven cavity rear plate.

7. Remove the four (4) screws holding the convection duct to the oven cavity rear plate.

8. Remove the convection duct assembly from the oven cavity rear plate.

9. Remove the one (1) nut and the two (2) washers holding the convection fan to the convection motor shaft.

10.Remove the convection fan.

These are the positions that should be pinched with pliers

11.

Remove the three (3) screws holding the convection

Table

Center of bracket

duct to the conv. thermal cover.

12.

Remove the convection duct with the conv. air angles from the conv. thermal cover.

13.Remove the thermal insulation.

14.

Remove the one (1) pipe holding the cooling fan to the convection motor shaft.

15.

Remove the cooling fan and the one (1) washer from the convection motor shaft.

16.

Remove the two (2) screws holding the convection motor to the conv. thermal cover.

17.

Remove the convection motor from the conv. thermal cover.

18.

Remove the one (1) ring from the convection motor shaft.

19.

Now, the convection motor is free.

R-820BK R-820BW

THERMISTOR REMOVAL

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. Now, the back plate with the sub back plate should be removed.

5. Disconnect the connector CN-D from the control unit.

6. Remove the one (1) screw holding the air duct to the oven cavity rear plate.

POWER SUPPLY CORD REPLACEMENT

Removal

Disconnect the power supply cord and case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the one (1) screw holding the green wire to the cavity rear plate.

5. Disconnect the leads of the power supply cord from the main wire harness.

6. Release the power supply cord from the oven cavity rear plate.

7. Now, the power supply cord is free.

Re-install

1. Insert the moulding cord stopper of power supply cord into the square hole of the oven cavity rear plate, referring to the Figure C-3.

2. Install the earth wire lead of power supply cord to the

then

remove outer

7. Remove the air duct with the air guide cover and the partition plate from the oven cavity rear plate.

8. Remove the one (1) screw holding the thermistor angle to the oven cavity rear plate.

9. Remove the thermistor angle together with thermistor from the oven.

10.Straighten the tab of the thermistor angle holding the thermistor to the thermistor angle.

11.Remove the thermistor from the thermistor angle

cavity rear plate with one (1) screw and tighten the screw.

3. Connect the brown and blue wire leads of power supply cord to the main wire harness correctly, referring to the Pictorial Diagram.

Moulding Cord Stopper

Power Supply Cord

Oven Cavity Rear Plate

Square Hole

Figure C-3. Power Supply Cord Replacement

GRIL HEATER (TOP HEATER) REMOVAL

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. Remove the one (1) screw holding the exhaust duct to the oven cavity.

5. Remove the exhaust duct from the oven cavity.

6. Disconnect the wire leads from the grill heaters.

7. Lay down the two (2) tabs holding the reflector to the

oven cavity.

8. Remove the reflector from the oven cavity by sliding it leftward.

9. Remove the grill heaters and the short terminal together from the oven cavity top plate.

10.Remove the two (2) screws holding the short terminal to the grill heaters.

11.Now the individual grill heaters are free.

BOTTOM HEATER REMOVAL

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. Remove the fan duct from the oven cavity, referring to "FAN MOTOR REPLACEMENT".

5. Disconnect the wire leads from the bottom heater.

6. Remove the two (2) nuts holding the bottom heater with the bottom heater angle and the heat seal spring to the oven cavity right wall.

7. Remove the two (2) nuts holding the bottom heater with the bottom heater angle and the heat seal spring to the oven cavity left wall.

8. Remove the bottom heater from the oven cavity .

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

R-820BK

Tab

Secondary Interlock Switch

Door Sensing Switch

Monitor Switch

Latch Hook

R-820BW

4. Remove the control panel assembly referring to "CONTROL PANEL ASSEMBLY REMOVAL".

5. Disconnect the leads from all switches.

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

7. Remove the latch hook.

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

Figure C-4. Switches

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

5. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.

6. Secure the screws with washers firmly.

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

After adjustment, check the following.

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

hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.

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

3. Monitor switch contacts close when door is opened.

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

Latch Heads

Door

Switch Lever

Latch Hook 

Door Sensing  Switch

Monitor Switch

Secondary Interlock Switch

Figure C-5. Latch Switch Adjustments

DOOR REPLACEMENT

REMOVAL

1. Disconnect the power supply cord.

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

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-6 to free engaging parts.

4. Pry the principles of the lever and lift up the choke cover by inserting a putty knife as shown in Figure C-6.

5. Release choke cover from door panel.

6. Now choke cover is free.

Choke Cover

Putty Knife

Door Frame

Figure C-6. Door Disassembly

R-820BK

Upper Oven Hinge

Upper  Oven Hinge

Lower  Oven Hinge

Choke Cover

Door Panel

R-820BW

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

8. Now, door sub assembly is free from oven cavity.

9. Remove the four (4) screws holding the door panel to the door frame.

10.Release door panel from seven (7) tabs of door frame by sliding door panel downward.

11.Now, door panel is free.

12.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.

13.Now, latch head and latch spring are free.

14.Remove the two (2) screws holding the glass stopper to the door frame.

15.Remove the glass stopper from the door frame.

16.Slide the front door glass left and then slide upwards to release the tabs holding it.

17.Now, the front door glass is free

RE-INSTALL

1. Re-install the front door glass to the door frame as follows.

1-1. Insert the lower edge of the front door glass into the six

(6) tabs of the door frame.

1-2. Slide the front door glass upwards and insert the upper

edge of the front door glass into the five (5) tabs of the door frame.

1-3. Slide the front door glass right and insert the right edge

of the front door glass into the two (2) tabs of the door frame.

2. Re-install the glass stopper to the door frame as follows.

2-1. Re-install the glass stopper to the door frame so that the

two (2) holes of the glass stopper meet the two (2) pins of the door frame.

2-2. Hold the glass stopper to the door frame with the two (2)

screws.

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

4. Re-install door panel to door frame by fitting seven (7) tabs of door frame to seven (7) holes of door panel.

5. Hold the door panel to the door frame with four (4) screws.

6. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges.

7. Re-install choke cover to door panel by pushing.

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

interlock switch are operating properly. (Refer to chapter "Test Procedures".).

(B) An approved microwave survey meter should be

used to assure compliance with proper microwave radiation emission limitation standards. (Refer to Microwave Measurement Procedure.)

face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity face plate.

4. Check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)

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

an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air-tight, moisture (condensation)-tight or light-tight. Therefore, occasional appearance of moisture, light or sensing of gentle warm air movement around oven door is not abnormal and do not in themselves indicate a leakage of microwave energy from oven cavity.

Figure C-7. Door Replacement

After any service, make sure of the following :

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

2. Deviation of door alignment from horizontal line of cavity

R-820BK R-820BW

AC120V 60Hz

FAN MOTOR

A 1

A 3

VRS1

(J1)

10G471K

RY5

D12D11

RY1

D1-4 11ES1

C1 0.1µ/50v

R4 27

+ –

C2 470µ/50v

Q2 2SB1238

R5 4.7k

C3 0.1µ/50v

+ –

C4 10µ/35v

R3 510 1/2w

R2 510 1/2w

SP1

R6 3.3k

C10

C 2

C 3 C 1 C 9 C 4

C 5

C15

LED

GND

VC VA

VR INT

BUZZER FAN MOTOR

CONVECTION

MOTOR OVEN LAMP

A 5

N.O.



TURNTABLE MOTOR 

BOTTOM

COM

N.O.

HEATER

COM

N.O. TOP HEATER

COM

N.O. MICRO

COM

RY6

RY4

RY3

RY2

D7D10D9D8

Q3 DTD143ES

C5 10µ/35v

–

CONVECTION

C16

MOTOR

OVEN LAMP TURNTABLE

C 6

MOTOR

BOTTOM

C14

HEATER

TOP HEATER

C 8

C11

N.C.

C 7

MICRO

OVEN

C17

THERMISTOR N.C.

C13

DOOR

C12

SWITCH

B 2 B 1D 3 D 1

OVEN THERMISTOR

DOOR SWITCH

NOTE : IF NOT SPECIFIED, 1/4w ± 5%

: IF NOT SPECIFIED, 1SS270A

Figure S-2. Power Unit Circuit

R-820BK R-820BW



HELP

COOK

SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9

SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31

SEG15 COM1 COM2 COM3 COM4 COM5

SEG32

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

SEG39

SEG40

SEG41

SEG42

SEG43

SEG44

SEG45

51 1

VL3 VL2 C 2

SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VCC VREF AVSS COM3 COM2 COM1 COM0

SEG10

C 1

SEG11

VL1

SEG12

AN7

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25 65

P57

P56

P55

P54

P53

AN6

AN5

AN4

AN3

AN2

P52

AN1

AN0

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

 RH-IZA888DR IC-1

P51

P50

P47

P46

P45

P44

INT1

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

SEG39

P16

P17

P20 P21 P22 P23

P24 P25 P26 P27 VSS

XOUT XIN P80 P81

P70 P71 P72

P41

INT0

P73

P40

P77

P76

P75

P74

RESET



(J1)



R56



R55 4.7k



CF1 4.19MGW



R67 15k



R66 15k



R65 15k



R64 15k



R63 15k



R62 15k



R61 15k



R60 15k

CUSTOM

BAKE

GRILL

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

54321

G 8



HELP

STOP

COOK

PIZZA

09876



CLEAR

GRILLROAST

POWER

START



CONVEC

POPCORN

TIMER

KITCHEN

DEFROST



REHEAT



PLUS

ROAST

MINUTE



LEVEL

CLOOK



TOUCH ON

G12 G11 G10 G 9



: IF NOT SPECIFIED, 1/10 ± 5%

: IF NOT SPECIFIED, 1SS355

: IF NOT SPECIFIED, 0.01µF / 25v

NOTE

Q10



Q11

DTA143EKA



 1k R14

2SA1037AK



R10 1k



0.1µ/50v C13



1k

R13

R12



0.1µ/50v C12

(J10)

(J11)

(J12)



R11 4.7k



UDZ4.3B ZD10

(J13) 4.7k(J14) 4.7k(J15) 4.7k



R71 15k 

R70 15k 

R69 15k 

R68 15k



C80

R72 100k



R73 100k



R74 100k



R82 9.1kF



R83 15k

R75 100k



C60 330p/50v

C61 330p/50v



0

C62 330p/50v

C63 330p/50v

R80 150kF



Figure S-3. CPU Unit Circuit

R81



C14



R15 4.7k

C30



R31 15k



R30 4.7k

Q20

DTA123JKA



D22

D23

D30



C11 0.1µ/50v

Q23

DTA143EKA

C21



0.1µ/50v



Q22

DTA123JKA

Q21

DTA123JKA



C10 47µ/16v

–

Q40

DTA143EKA

LD2 LD3 LD4 LD5 LD1

Q25

DTA143EKA

Q24

DTA143EKA

LD10 LD9 LD8 LD7 LD6

C 4

INT

C 2

GND

C 3

C 5

BUZZER

C 1

C10

LED

C 9

C15

FAN

MOTOR

C16

OVEN LAMP

TURNTABLE

CONVECTION

MOTOR

C 8

MOTOR

TOP

HEATER

BOTTOM

C14

HEATER

C 7

MICRO

C11

C 6

C12

DOOR

SWITCH

C13

C17

OVEN

THERMISTOR

R-820BK R-820BW

D10

T - H

RY3

DIP

SP1

RY6

CN - C

12 1

ZD1

CN - B

D11

CN - D

B - H

RY4

MICRO

RY2

(J1)

LOT NO.

VRS1

FAN

CN - A

CON

RY1

D12

Figure S-4. Printed Wiring Board of Power Unit

RY5

PARTS LIST

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

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

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

ELECTRIC PARTS

1- 1 QSW-MA110WRE0 Secondary interlock switch / door sensing switch 2 AH 1- 1 QSW-MA131WRE0 1- 2 FFS-BA021WRK0 Monitor fuse and monitor switch assembly 1 AL 1- 3 RMOTDA231WRE0 Turntable motor 1 AR 1- 3 RMOTDA188WRE0 Turntable motor (Interchangeable) 1 AS 1- 4 FH-DZA025WRK0 High voltage rectifier assembly 1 AN

1- 5 RC-QZA173WRE0 High voltage capacitor 1 AX

1- 5 RC-QZA211WRE0 High voltage capacitor (Interchangeable) 1 AV

1- 6 RMOTEA370WRE0 Fan motor 1 AX 1- 7 QFSHDA009WRE0 Fuse holder 1 AG 1- 7 QFSHDA010WRE0 Fuse holder (Interchangeable) 1 AD 1- 8 FACCDA074WRE0 Power supply cord 1 AW 1- 9 FH-HZA063WRE0 Thremistor 1 AP 1-10 RMOTEA372WRE0 Convection motor 1 AX 1-11 QTANNA017WRW0 Short terminal 1 AD 1-12 RHET-A208WRE0 Grill heater (Top heater) 2 AU 1-13 RHET-A209WRE0 Bottom heater 1 BA 1-14 RLMPTA030WRE0 Oven lamp 1 AE 1-15 QSOCLA021WRE0 Oven lamp socket 1 AG 1-16 RTHM-A048WRE0 Thermal cut-out 170 deg. 1 AH 1-17 RTHM-A078WRE0 Thermal cut-out 125 deg. 1 AK 1-18 RTRN-A568WRE0 Power transformer 1 BP

1-19 RV-MZA222WRE0 Magnetron 1 BN

∆

1-19 RV-MZA267WRE0 Magnetron (Interchangeable) 1 BL

∆

2- 1 GCABDA097WRW0 Back plate 1 AW 2- 2 GCABUA631WRP0 Outer case cabinet [R-820BK] 1 BB 2- 2 GCABUA649WRP0 Outer case cabinet [R-820BW] 1 AZ 2- 3 GDAI-A305WRW0 Base plate 1 AX 2- 4 GLEGPA074WRE0 Leg 1 AC

3- 1 CPWBFA791WRK0 Power unit 1 BF 3- 1A QCNCMA234DRE0 3-pin connector (CN-A) 1 AC 3- 1B QCNCMA275DRE0 2-pin connector (CN-B) 1 AB 3- 1C FW-VZA238DRE0 9pin wire harness (WH-1, WH-2) 2 AK 3- 1D QCNCMA410DRE0 2-pin connector (CN-D) 1 AB C1 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA C2 VCEAB31HW477M Capacitor 470 uF 50V 1 AE C3 RC-KZA087DRE0 Capacitor 0.1 uF 50V 1 AA C4-5 VCEAB31VW106M Capacitor 10 uF 35V 2 AA D1-4 VHD11ES1///-1 Diode (11ES1) 4 AB D5-7 VHD1SS270A/-1 Diode (1SS270A) 3 AA D8-12 VHD1SS270A/-1 Diode (1SS270A) 5 AA Q2 VS2SB1238//-3 Transistor (2SB1238) 1 AA Q3 VSDTD143ES/-3 Transistor (DTD143ES) 1 AC R2-3 VRD-B12HF511J Resistor 510 ohm 1/2W 2 AB R4 VRD-B12EF270J Resistor 27 ohm 1/4W 1 AB R5 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA R6 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA RY1 RRLY-A080DRE0 Relay (OJ-SH-124LM) 1 AG RY2 RRLY-A081DRE0 Relay (VRB24) 1 AL RY3-4 RRLY-A076DRE0 Relay (OMIF-S-124LM) 2 AK RY5 RRLY-A080DRE0 Relay (OJ-SH-124LM) 1 AG RY6 RRLY-A076DRE0 Relay (OMIF-S-124LM) 1 AK SP1 RALM-A014DRE0 Buzzer (PKM22EPT-THAI) 1 AG T1 RTRNPA124DRE0 Transformer 1 AQ VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE 3- 2 DPWBFB794WRK0 CPU unit 1 BC 3- 3 DPNLCB494WRK0 Control panel frame with key unit [R-820BK] 1 BA 3- 3 DPNLCB496WRK0 Control panel frame with key unit [R-820BW] 1 BB 3- 3-1 JBTN-B086WRF0 Open button [R-820BW] 1 AF 3- 3-1 JBTN-B092WRF0 Open button [R-820BK] 1 AF 3- 3-2 MSPRCA050WRE0 Open button spring 1 AB 3- 3-3 FUNTKA869WRE0 Key unit [R-820BK] 1 AX 3- 3-3 FUNTKA871WRE0 Key unit [R-820BW] 1 AX

Secondary interlock switch / door sensing switch (Interchangeable)

2AG

CABINET PARTS

CONTROL PANEL PARTS

R-820BK R-820BW

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

3- 4 LHLD-A185WRF0 LCD holder 1 AL 3- 5 PSHEPA626WRE0 LED sheet 1 AF 3- 6 TCAUAA076WRR0 User caution label 1 AB 3- 7 XEPSD30P08XS0 Screw; 3mm x 8mm 4 AA

OVEN PARTS

4- 1 ************* Oven cavity (Not a replaceable part) 1--

∆

4- 2 PHOK-A106WRF0 Latch hook 1 AL

∆

4- 3 FDUC-A337WRK0 Air duct assembly 1 BH 4- 4 PCOVPA340WRW0 Sub back plate 1 AQ 4- 5 LANGQA478WRP0 Turntable motor angle 1 AP 4- 6 MSPRTA186WRE0 Plate spring 1 AE 4- 7 NCPL-A051WRE0 Turntable motor shaft 1 AN 4- 8 PSPA-A109WRE0 Spacer 1 AB 4- 9 LBNDKA136WRP0 HV capacitor holder 1 AQ 4-10 NFANJA041WRE0 Fan blade 1 AF 4-11 PDUC-A697WRF0 Fan duct 1 AM 4-12 GCOVHA388WRW0 Bottom heater cover 1 AF 4-13 GLEGPA071WRF0 Leg 1 AG 4-14 LANGFA185WRP0 Chassis support 1 AM 4-15 LANGQA489WRP0 Thermistor angle 1 AW 4-16 LFLG-A025WRE0 Bearing 1 AM 4-17 MLEVPA226WRF0 Switch lever 1 AF 4-18 MSPR-A004WRE0 Heat seal spring 2 AF 4-19 PCOV-A011WRP0 Bottom heater angle 2 AM 4-20 PCOVPA339WRE0 Waveguide cover 1 AF 4-21 PCUSGA385WRP0 Cushion 2 AH 4-22 PCUSUA190WRP0 Cushion 1 AC 4-23 PCUSUA191WRP0 Cushion 1 AC 4-24 PDUC-A691WRF0 Air intake duct 1 AG 4-25 PDUC-A692WRP0 Exhaust duct 1 AS 4-26 PDUC-A696WRP0 Air guide 1 AT 4-27 PGLSPA518WRE0 Light glass 1 AZ 4-28 PPACGA041WRE0 Cushion 1 AE 4-29 PREFHA061WRW0 Reflector 1 BE 4-30 PSHEPA487WRE0 Heater film 1 AA 4-31 PSKR-A331WRP0 Air separate angle 1 AY 4-32 MSPRCA113WRE0 H-spring 2 AC 4-33 PCUSGA420WRP0 Cushion 1 AE 4-34 NFANMA047WRP0 Convection fan 1 AX 4-35 NFANMA048WRP0 Cooling fan 1 AX 4-36 PCUSUA499WRP0 Cushion 1 AC 4-37 PDUC-A707WRW0 Convection duct 1 AR 4-38 PFPF-A210WRE0 Thermal insulation 1 AM 4-39 PPIPFA030WRE0 Pipe 1 AK 4-40 PSKR-A339WRP0 Convection air angle 2 AX 4-41 PSKR-A345WRW0 Convection motor angle A 1 AU 4-42 PSKR-A346WRW0 Convection motor angle B 1 AR 4-43 PSLDHA140WRW0 Convection thermal cover 1 AQ

DOOR PARTS

5- 1 DDORFA857WRK0 Door panel assembly 1 BB

∆

5- 2 GWAKPA570WRR0 Door frame [R-820BK] 1 AY

∆

5- 2 GWAKPA572WRR0 Door frame [R-820BW] 1 AX

∆

5- 3 LSTPPA176WRF0 Latch head 1 AN

∆

5- 4 LSTPPA177WRF0 Glass stopper 1 AF 5- 5 MSPRTA187WRE0 Latch spring 1 AC 5- 6 PGLSPA513WRE0 Front door glass [R-820BK] 1 AV 5- 6 PGLSPA514WRE0 Front door glass [R-820BW] 1 AW 5- 7 XCPSD40P06000 Screw : 4mm x 6mm 2 AA 5- 8 XCPSD40P08000 Screw : 4mm x 8mm 4 AA 5- 9 GCOVHA387WRF0 Choke cover 1 AS

MISCELLANEOUS

6- 1 FAMI-A104WRM0 Rack 1 AQ 6- 2 TCAUAA145WRR0 Earth caution 1 AG 6- 3 FSRAHA062WRY0 Turntable support 1 BC 6- 4 NTNT-A097WRE0 Turntable 1 BB 6- 5 TCAUAA200WRR0 Monitor caution 1 AB 6- 6 TINSEA752WRR0 Instruction book 1 AS 6- 7 FW-VZB045WRE0 Switch harness 1 AG 6- 8 FW-VZB673WRE0 Main wire harness 1 AY 6- 9 QW-QZA213WRE0 High voltage wire B 1 AF

R-820BK R-820BW

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

6-10 LHLDWA011WRE0 Purse lock M 1 AB 6-11 TCAUAA201WRR0 DHHS caution label 1 AC 6-12 TCAUAA240WRR0 Screw caution 1 AC 6-13 TLABMA570WRR0 Menu label 1 AF

SCREWS,NUTS AND WASHERS

7- 1 XFPSD40P08K00 Screw : 4mm x 8mm 13 AA 7- 2 XEPSD40P25000 Screw : 4mm x 25mm 2 AA 7- 3 LX-EZA042WRE0 Special screw 2 AB 7- 4 LX-NZ0061WRE0 Flange nut 4 AA 7- 5 XBPWW30P05K00 Screw : 3mm x 5mm 2 AA 7- 6 XCTWW40P08000 Screw : 4mm x 8mm 8 AB 7- 7 XHPSD30P06000 Screw : 3mm x 6mm 1 AA 7- 8 XHTSD40P08RV0 Screw : 4mm x 8mm 2 AA 7- 9 XOTSD40P12RV0 Screw : 4mm x 12mm 12 AA 7-10 XOTSD40P12000 Screw : 4mm x 12mm 10 AA 7-11 XOTSD40R12RV0 Line head screw : 4mm x 12mm 2 AA 7-12 XOTSF40P08000 Screw : 4mm x 8mm [R-820BK] 1 AA 7-12 XOTSE40P08000 Screw : 4mm x 8mm [R-820BW] 1 AA 7-13 XBTSD40P05000 Screw : 4mm x 5mm 2 AA 7-14 XNEUW40-32000 Nut : 4mm x 3.2mm 1 AA 7-15 XRESE40-06000 Ring : 4mm x 0.6mm 1 AA 7-16 XWHUW40-08000 Washer : 4mm x 0.8mm 1 AA 7-17 XWHUW50-08000 Washer : 5mm x 0.8mm 1 AA 7-18 XWSUW40-10000 Washer : 4mm x 1.0mm 1 AA 7-19 LX-CZA070WRE0 Special screw (Torx tamper proof screw) 2 AC

HOW TO ORDER REPLACEMENT PARTS

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

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

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

PACKING AND ACCESSORIES

TRAY HOLDER

(SPADFA424WRE0)

TURNTABLE TRAY

RACK

LAMP CAUTION

COOK BOOK &  INSTRUCTION BOOK

TOP PAD ASSEMBLY

(FPADBA381WRK0)

WRAP COVER

(SSAKHA034WRE0)

DOOR PROTECTION SHEET (SPADPA204WRE0)

TURNTABLE SUPPORT

TRAY PAD

(SPADPA577WRE0)

Not Replaceable Items.

BOTTOM PAD ASSEMBLY

(FPADBA382WRK0)

PACKING CASE

SPAKCD092WRE0 [R-820BK] SPAKCD095WRE0 [R-820BW]

R-820BK R-820BW

OVEN AND CABINET PARTS

4-23

4-26

7-4

4-19

4-32

6-13

4-1

7-6

1-13

4-20

4-25

7-5

1-11

7-10

4-18

7-6

6-4

2-2

4-33

4-29

1-12

4-27

1-16

4-16

7-1

4-7

4-6

4-8

4-5

7-1

1-3

4-12

7-10

4-30

6-7

7-9

7-1

4-18

4-32

7-1

1-9

7-9

4-15

4-19

4-2

7-10

7-1

6-12

7-8

7-4

1-1

7-19

7-9

6-11

7-19

7-11

2-1

7-12

7-10

4-3

4-41

7-17

7-13

4-39

1-8

4-31

7-10

1-14

4-38

1-15

4-40

7-6

4-34

7-16

4-10

4-40

4-14

4-11

7-10

6-5

4-24

7-10

1-5

7-7

4-21

7-14

1-17

7-18

7-8

1-4

1-7

7-1

4-9

7-11

7-13

4-37

7-15

4-35

1-6

7-9

4-36

1-10

4-43

4-4

7-2

6-2

7-10



7-10

4-42

6-3

7-9

2-4

7-1

4-22

1-18

7-3

4-17

4-28

2-3

7-9

2-4

1-2

1-1

1-19

7-1

4-13

7-9

R-820BK R-820BW

CONTROL PANEL PARTS

3-6

3-2

3-3

3-3-3

3-3-1

3-4

3-5

3-7

3-1

DOOR PARTS

5-2

6-1

5-6

3-3-2

5-1

5-5

5-4

5-7

5-8

5-9

5-3

MISCELLANEOUS

6-8

6-7

6-9

Actual wire harness may be different from illustration.

6-10

R-820BK R-820BW

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.

'98 SHARP CORP. (5S2.530E) Printed in U.S.A

Sharp R-820BW User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual