Sharp R-1480, R-1482, R-1481 User Manual

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SER VICE MANU AL

S3807R1480X//

OVER THE RANGE

MICROWAVE OVEN

R-1480 R-1481 R-1482

MODELS

R-1480 R-1481

1 Coffee/tea

CUSTOM HELP

2 Roll/muffin, fresh

BREAKFAST

3 Roll/muffin, frozen 4 Hot cereal 5 Scrambled eggs  1 Dinner plate

SNACKS &

POPCORN

2 Pasta/casserole



3 Frozen entree

REHEAT

4 Frozen snack 5 Pizza, slice

1 Baked potatoes

COMPU DEFROST

2 Fresh vegetables

COMPU COOK

3 Frozen vegetables 4 Rice 5 Ground meat

12345 67890

POWER

KITCHEN TIMER

LEVEL

MINUTE

CLOCK

PLUS

TURNTABLE

STOP

ON/OFF

START

CLEAR

TOUCH ON

WORK

NIGHT

LIGHT

FAN

LIGHT

HI/LO

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

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

TABLE OF CONTENTS

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 ............................................................................................................................11

TEST PROCEDURE............................................................................................................................................12

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................26

PICTORIAL DIAGRAM ........................................................................................................................................34

CONTROL PANEL CIRCUIT ...............................................................................................................................35

PRINTED WIRING BOARD .................................................................................................................................36

PARTS LIST ........................................................................................................................................................37

PACKING AND ACCESSORIES .........................................................................................................................42

R-1482

Page

SHARP CORPORATION

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

R-1480 R-1481 R-1482

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-1480 R-1481 R-1482

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 these 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-1480 R-1481 R-1482

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-1480 R-1481 R-1482

OVER THE RANGE

MICROWAVE OVEN

R-1480 / R-1481 / R-1482

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP OVER THE RANGE MICROWAVE OVEN, R-1480, R-1481, R-1482.

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 not any 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

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

PARTS LIST

R-1480 R-1481 R-1482

PRODUCT SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 14.3 Amperes

60 Hertz Single phase, 3 wire grounded

Power Output 950 watts (IEC-705 TEST PROCEDURE)

Operating frequency of 2450MHz Convection Power Output 1700 watts Case Dimensions Width 29-15/16"

Height 16-3/8"

Depth 15- 1/4" (Not including the door handle) Cooking Cavity Dimensions Width 20-1/4"

Height 8-3/16"

1.4 Cubic Feet Depth 14-1/2" Hood lamp 2 bulbs, 30W x 2, Incandescent light bulbs Hood fan Approx. 300 C.F.M. Control Complement Touch Control System

Clock ( 1:00 - 12:59 )

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

CUSTOM HELP pad, BREAKFAST pad, POPCORN pad,

SNACKS & REHEAT pad, COMPU DEFROST pad, COMPU COOK pad,

Number selection pads, POWER LEVEL pad, KITCHEN TIMER / CLOCK pad

MINUTE PLUS pad, TURNTABLE ON / OFF pad, START / TOUCH ON pad

WORK LIGHT pad, NIGHT LIGHT pad, FAN HI / LO pad

Oven Cavity Light 30W x 1 Incandescent light bulb Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J Weight Approx. 55 lbs.

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.

R-1480 R-1481 R-1482

Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more branch circuit, using a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood system mounting location.

3-Pronged Plug

Grounded Receptacle Box

Grounding Pin

3-Pronged Receptacle

OVEN DIAGRAM

1. Oven door with see-through window.

2. Door hinges.

3. Stirrer cover.

4. Turntable motor shaft.

5. Oven lamp. It will light when oven is operating or door is open.

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

7. Auto-Touch control panel.

8. Time display: Digital display, 99 minutes 99 seconds.

9. Ventilation openings.

10.Light Cover.

11.Grease filters.

12.Removable turntable. The turntable will rotate clockwise or counterclockwise. Only remove for cleaning.

13.Removable turntable support.

14. Power supply cord

R-1480 R-1481 R-1482

CONTROL PANEL

MIX CONV COOK LBS KG

CUSTOM HELP

POPCORN

COMPU DEFROST

TURNTABLE

BREAKFAST

SNACKS & REHEAT

COMPU COOK

OFF HELP

1 Coffee/tea 2 Roll/muffin, fresh 3 Roll/muffin, frozen 4 Hot cereal 5 Scrambled eggs 

1 Dinner plate 2 Pasta/casserole



3 Frozen entree 4 Frozen snack 5 Pizza, slice

1 Baked potatoes 2 Fresh vegetables 3 Frozen vegetables 4 Rice 5 Ground meat

12345 67890

POWER

LEVEL

KITCHEN TIMER

CLOCK

MINUTE

PLUS

TURNTABLE

ON/OFF

WORK LIGHT

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

OFF CONDITION

Closing the door activates the door sensing switch and secondary interlock 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 .

STOP

CLEAR

NIGHT LIGHT

START

TOUCH ON

FAN

HI/LO

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

COOKING CONDITION

Program desired cooking time touching the NUMBER pads. 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)

R-1480 R-1481 R-1482

RELAY CONNECTED COMPONENTS RY1 Oven lamp / Fan motor / Stirrer motor RY2 Power transformer RY3 Turntable motor RY4 Hood fan motor

2. 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the filament winding, and approximately 2000 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 and primary interlock relay are activated with the following results. The circuits to the stirrer motor, the cooling fan motor, the turntable motor, and the high voltage components are de-energized, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

7. The monitor switch is electrically monitoring the operation of the secondary interlock switch and primary interlock relay (RY2) and is mechanically associated with the door so that it will function in the following sequence. (1) When the door opens from a closed position, the

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

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

monitor switch contacts first open, and then the contacts of the secondary interlock switch and door

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

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 (RY2) which is operated by the control unit within an interval 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.

COMPU COOK

COMPU COOK will automatically compute the microwave power and cooking time. Set the desired program by touching one of the COMPU COOK pad, and number pad to select menu. Enter the weight or quantity by touching the Number pads. When the START pad is touched, the following operations occur:

1. The COOK indicator will light.

2. The cooking time will appear on the display and start counting down to zero. The cooking time is adjusted automatically according to the weight of the food.

3. The shut-off relays (RY1, RY2 and RY3) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. The power supply voltage is applied to the heating element.

4. Now, the oven is in the microwave cooking mode.

COMPU DEFROST COOKING

The COMPU DEFROST key is a special function key to defrost meats and poultry faster and better. COMPU DEFROST automatically defrosts roast beef, etc.. Touch the COMPU COOK pad and number pad to select menu and enter the food weight by touching the number pads. When the START pad is touched, the oven will cook according to the special cooking sequence.

R-1480 R-1481 R-1482

VENTILATION METHODS HOT AIR EXHAUST

1. VERTICAL VENTING For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover, up through the right and left sides of the oven cavity, then discharged vertically at rear center top of the oven, into the customer's vent system.

_: AIR FLOW

TO DUCT

HOOD FAN MOTOR

HOOD  INTAKE  DUCT

GREASE  FILTER 

2. HORIZONTAL VENTING The air handing is the same as VERTICAL VENTING except that the final air discharge is directed horizontally out from the top rear of the oven into the customer's vent system.

TO DUCT

_: AIR FLOW

HOOD FAN MOTOR

HOOD  INTAKE  DUCT

GREASE  FILTER

3. RE-CIRCULATION (INSIDE VENTING)



The air handing is the same as VERTICAL VENTING except that the final air discharge is directed horizontally through the upper front of the oven into the kitchen. IN this case, the accessory charcoal filter RK-230 must be provided to filter the air before it leaves the oven.

_: AIR FLOW

HOOD FAN MOTOR

HOOD EXHAUST  LOUVER

HOOD  INTAKE  DUCT

CHARCOAL  FILTER

TO DUCT

CAVITY  THERMAL CUT-OUT

MAGNETRON  TEMPERATURE FUSE

R-1480 R-1481 R-1482

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

FUSE  20A

120 V AC. 60 Hz

BLKWHT

GRN

GND

HOOD FAN THERMAL CUT OUT

B3 B1

HOOD MOTOR

CAVITY  THERMAL CUT-OUT

CONTROL UNIT

RY4

RY5

High

N.C.

Low

HOOD CAPACITOR

A1 A3 B9 A7 A5 N.O.

HOOD LAMP

SSR

RY3 RY1

TTM

HL HL

TURNTABLE

MOTOR

FAN

MOTOR

SECONDARY INTERLOCK SWITCH

Figure O-1. Oven Schematic-Off Condition

MAGNETRON  TEMPERATURE FUSE

COM. N.O.

OVEN LAMP

COM.

PRIMARY

INTERLOCK 

RELAY

RY2

STM

STIRRER

MOTOR

DOOR SENSING SWITCH

POWER TRANSFORMER

MAGNETRON

MONITOR

SWITCH

HIGH VOLTAGE CAPACITOR

0.94µF

HIGH VOLTAGE RECTIFIER

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "HIGH"

4. "START" PAD TOUCHED

FUSE  20A

120 V AC. 60 Hz

BLKWHT

GRN

GND

HOOD FAN THERMAL CUT OUT

CONTROL UNIT

B3 B1

HOOD MOTOR

RY4

RY5

High

N.C.

Low

HOOD CAPACITOR

A1 A3 B9 A7 A5 N.O.

HOOD LAMP

SSR

HL HL

Figure O-2. Oven Schematic-Cooking Condition

RY3 RY1

TTM

TURNTABLE

MOTOR

FAN

MOTOR

SECONDARY INTERLOCK SWITCH

COM. N.O.

OVEN LAMP

COM.

PRIMARY

INTERLOCK 

RELAY

RY2

STM

STIRRER

MOTOR

DOOR SENSING SWITCH

MONITOR

SWITCH

POWER TRANSFORMER

HIGH VOLTAGE CAPACITOR

0.94µF

HIGH VOLTAGE RECTIFIER

MAGNETRON

R-1480 R-1481 R-1482

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM

The door is opened by pulling the door handle, refer to the Figure D-1.

Latch Hook

Latch Heads

Door

Door Sensing Switch

Monitor Fuse

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 circuit to all 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.

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 contact 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. And the contacts of relay (RY1) are in the ON condition (contacts close).

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 of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR

FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND SWITCH ARE REPLACED

AS AN ASSEMBLY

TEMPERATURE FUSE (MG)

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

THERMAL CUT-OUT (HOOD )

This thermal cut-out located on the right base plate. It is designed to automatically turn on the hood fan motor whenever the hot air rising from the conventional range below causes the temperature at the thermal cut-out to rise to 140˚F (60˚C) or higher, thus removing this hot air from around microwave oven. When the temperature around the thermal cut-out drops to 113˚F (45˚C) or lower, the thermal cut-out shuts off the hood fan motor.

THERMAL CUT-OUT (CAVITY )

This thermal cut-out is located on the top of the oven cavity. It is designed to prevent damage to the oven unit if the food in the oven catches fire due to overheating produced by improper setting of cooking time or failure of control unit. Under normal operation, the thermal cut-out remains closed. However, the thermal cut-out will open at 293˚F (145˚C) causing the oven to shut down.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the foods on the turntable cook evenly during cooking. Turntable will turn in either direction. The turntable motor can be turned off by touching TURNTABLE ON/OFF pad.

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 foods. It is then exhausted through the exhausting air vents at the oven cavity.

HOOD FAN MOTOR

The hood fan motor is a two-speed, single-phase, double pole induction type, requiring a hood fan capacitor. It is located outside the upper rear part of the oven cavity, is to remove, from around the oven, hot air rising from the conventional electric or gas range over which it is installed.

R-1480 R-1481 R-1482

This air is then expelled either vertically or horizontally through the customer supplied duct system, or discharged back into the kitchen.

HOOD LAMP

The hood lamps are mounted at the hood lamp angle on the base cover. The hood lamps can be turned off and on by touching the WORK LIGHT pad or the NIGHT LIGHT pad.

STIRRER MOTOR

The stirrer motor drives the stirrer fan to stir the microwave

And also the brightness can be varied to high or low by touching the WORK LIGHT pad or the NIGHT LIGHT pad.

radiation from the waveguide.

TROUBLESHOOTING GUIDE

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

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure "section.

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)

primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/ KiT 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-1480 R-1481 R-1482

CK LOW VOLTAGE CK NO POWER AT OUTLET 

RE SHORTED IN POWER CORD CK OPENED OR SHORTED WIRING CK HOOD MOTOR CAPACITOR RE HOOD LAMP OR SOCKET CK TURNTABLE OFF CONDITION RE STIRRER MOTOR RE TURNTABLE MOTOR RE FAN MOTOR RE OVEN LAMP OR SOCKET  P FOIL PATERN ON P.W.B.  O COMPU DEFROST  N RELAY (RY-5)  N RELAY (RY-4)  N RELAY (RY-3)  N RELAY (RY-2)  N RELAY (RY-1)  M KEY UNIT  L CONTROL UNIT  K HOOD FAN MOTOR   J HOOD HERMAL CUT-OUT   I MONITOR FUSE   H MONITOR SWITCH G

PRIMARY INTERLOCK SYSTEM  F SECONDARY INTERLOCK SWITCH E

TEMPERATURE FUSE OR THERMAL CUT-OUT



 D HIGH VOLTAGE CAPACITOR  C H.V. RECTIFIER   B POWER TRANSFORMER  A MAGNETRON

CK = Check / RE = Replace



POSSIBLE CASE AND  DEFECTIVE PARTS

TEST PROCEDURE

PROBLEM



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

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

Display does not illuminate when power cord is first plugged into wall

receptacle.



CONDITION



Display does not operate properly when STOP/CLEAR key is touched.

(The time of day should appear on the display with beep sound during

normal condition.)



Hood fan motor operates when power cord is first plugged into wall

receptacle.



Oven lamp does not light with door is opened.

 OFF

CONDITION



Temperature of oven base seems more than 140˚F (60˚C) because of

operation of the range below. But hood fan motor does not turn on

automatically. (Normally, food fan motor should be operating at low

speed.)



Hood lights do not turn on when WORK LIGHT pad or NIGHT LIGHT pad

is pressed.



Hood fan motor does not rotate at all with touched FAN HI/LO pad.



Speed of the hood fan motor does not change when the FAN HI/LO pad is

touched for this function.



Oven lamp does not light in cook cycle. (But it does light when door is

opened.)

 IDLE

CONDITION



Fan motor does not operate. (Oven lamp and turntable motor operate.)



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



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

(Food incompletely cooked or not cooked at all at end of cook cycle.)



Turntable motor does not operate (Oven lamp lights and fan motor

operate.)

Oven goes into a cook cycle but extremely uneven heating is produced in



COOKING

CONDITION

MICROWAVE



oven load (food).



Variable cooking does not operate properly except Cooking Power 10 (P-

HI) mode.



Stirrer motor does not operate. (Other parts operate.)



Oven goes into COMPU DEFROST but food is not defrosted well.

Function of COMPU DEFROST does not operate properly.



TEST PROCEDURES

R-1480 R-1481 R-1482

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:

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 27.7 to 51.5˚F(15.4 to 28.6˚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.

COMPONENT TEST

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 90 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-1480 R-1481 R-1482

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 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 CAVITY THERMAL CUT-OUT 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. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 293˚F(145˚C). An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and check inside of oven cavity and 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.

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

5. Reconnect all leads removed from components during testing.

TEST PROCEDURES

R-1480 R-1481 R-1482

PROCEDURE

LETTER

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 OR TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT

AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR TEMPERATURE FUSE.

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.

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

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.

H 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-1480 R-1481 R-1482

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.

I BLOWN MONITOR FUSE TEST

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

2. Open the door and block it open.

3. Discharge 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-BA016/KiT, 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. Re-install the outer case (cabinet).

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

8. Run the oven and check all functions.

COMPONENT TEST

Black

Screw Driver

Secondary Interlock Switch

White

/White

Monitor Switch

Ohmmeter

J HOOD THERMAL CUT-OUT 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. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the temperature of the thermal cut-out reaches approximately 140˚F(60˚C) or more. At that temperature, the contacts will close. The thermal cut-out opens automatically at approximately 113˚F(45˚C).

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.

K HOOD FAN MOTOR 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 motor does not turn, touch the FAN HI / LO pad once (set hood fan motor power "HIGH") and check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120 Volts appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not appear, check the motor circuit. The resistance values of motor terminals are as follows:

TEST PROCEDURES

R-1480 R-1481 R-1482

PROCEDURE

LETTER

YLW

HOOD FAN CAPACITOR

RED

20 Ω45 Ω

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

L TOUCH CONTROL PANEL ASSEMBLY TEST

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

Before testing,

1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of "HOOD EXHAUST LOUVER REMOVAL", "REMOVAL OF OVEN FROM WALL" and "OUTER CASE REMOVAL".

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.

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).

32 Ω

COMPONENT TEST

BLU

BLU (1) AND YLW (4) = 0Ω (Shorted) BLK (2) AND YLW (4) = 32 Ω BLU (1) AND BLK (2) = 32Ω BLK (2) AND WHT (3) = 20Ω WHT (3) AND RED (5) = 45Ω

BLK

WHT

Resistance between;

6-PIN CONNECTOR OF HOOD FAN MOTOR

BLU BLK WHT

123

YLW RED

R-1480 R-1481 R-1482

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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.

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

BREAK

CUSTOM

FAST

&

HELP

POPCORN

COMPU

DEFROST

G 9G10G11G12

SNACKS REHEAT

COMPU

COOK



POWER

LEVEL

KITCHEN

TIMER

CLOCK

MINUTE

PLUS

8 9

26 3

4 5

TURN

TABLE

ON / OFF

STOP

CLEAR

START

TOUCH ON

WORK LIGHT

NIGHT LIGHT

FAN

HI / LO

TEST PROCEDURES

R-1480 R-1481 R-1482

PROCEDURE

LETTER

N RELAY TEST

COMPONENT 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 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. 7 of the 4 pin connector (A) and the common terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit.

RY1 and RY2 Relay Test

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

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

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

good, control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 24.0V D.C. Oven lamp / Fan motor / Stirrer motor RY2(COOK) Approx. 24.0V D.C. Power transformer RY3 Approx. 24.0V D.C. Turntable motor RY4 Approx. 24.0V D.C. Hood motor RY5 Approx. 24.0V D.C. Hood motor (HIGH /LOW selection)

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.

O COMPU DEFROST TEST

(1)Place one cup of water in the center of the turntable tray in the oven cavity. (2)Close the door, touch the " COMPU DEFROST " pad once and touch the Number pad "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

0.5lbs 70% 35sec. 0% 40sec. 50% 30sec. 30% 35sec.

(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.

R-1480 R-1481 R-1482

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

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 192Ω ± 15%). If any abnormal condition is detected, replace the defective parts.

Q27

AC(H)

RY3

D20

(J1)

(470V) VRS1

AC(N) TTM

357

C100

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.

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between

1 Pin No. 7 of the 4-pin connector (A) and the Check supply voltage and oven power cord.

common terminal of the relay RY1. 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.

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

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

(1) Key Unit (2) Control Unit

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

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00 - P07. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R24 - R27 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 and indicator circuit.

1) LSI

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

2) Power Source Circuit

This circuit generates voltages necessary for the control unit from the AC line voltage.

Symbol Voltage Application

3) Synchronizing Signal Circuit

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

4) ACL Circuit

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

5) Buzzer Circuit

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

6) Door Sensing Switch

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

7) Relay Circuit

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

8) Indicator Circuit

Indicator element is a Fluorescent Display. Basically, a Fluorescent Display is a triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode. The Fluorescent Display has 8-digits, 15-segments are used for displaying figures.

VC -5.1V LSI(IC1) VP -28V Fluorescent display tube : Grid

and anode voltage

VF1-VF2 2.7Vac Filament of fluorescent dis-

play tube (VF1 to VF2 voltage)

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DESCRIPTION OF LSI

LSI(IZA876DR)

The I/O signals of the LSI(IZA876DR) are detailed in the following table.

Pin No. Signal I/O Description

1 VCC IN Connected to GND. 2 VEE IN

3 AVSS IN

4 VREF IN

5-6 AN7-AN6 IN Terminal not used. 7-9 AN5-AN3 IN Heating constant compensation terminal. 10 AN2 IN

11-12 AN1-AN0 IN Connected to GND(0V). 13 P55 OUT Terminal not used.

14 P54 OUT

Anode (segment) of Fluorescent Display illumination voltage: -31V.

Vp voltage of power source circuit input.

Power source voltage:-5V.

VC voltage of power source circuit input.

Reference voltage input terminal.

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

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

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

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

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

16.7 msec.

During cooking

15 P53 OUT Turntable motor driving signal.

To turn on and off relay(RY3). "L" level: During Turntable ON. "H" level: During Turntable OFF or during the oven is off condition.

16 P52 OUT Terminal not used.

17 P51 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay(RY2). In P-HI operation, the signals holds "L" level during microwave cooking and "H" level while not cooking. In other cooking modes (P-90,P-80,P-70,P60,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-MODE 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.

18 P50 OUT Terminal not used. 19 P47 OUT

Hood lamp driving signal.

To turn on and off solid state relay(SSR1). "1" level: During Hood lamp ON (WORK LIGHT level). "2" level: During Hood lamp ON (NIGHT LIGHT level). "H" level: During Hood lamp OFF.

20 P46 OUT Hood motor driving signal.

To turn on and off relay(RY9). "L" level: During Hood motor ON. "H" level: During Hood motor OFF.

21 P45 OUT

Hood motor high / low driving signal.

To turn on and off relay(RY5). "L" level: During Hood motor high. "H" level: During Hood motor low.

H : GND

OFF

L H

OFF

AC CURRENT

WORK LIGHT

NIGHT LIGHT

H : GND

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H: GND

0.1 sec

2 sec

1 sec

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Pin No. Signal I/O Description

22 P44 OUT Terminal not used. 23 P43 OUT

Signal to sound buzzer.

A: key touch sound. B: Completion sound. C: When the temperature of the oven cavity reaches

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

24 P42 IN Terminal not used. 25 INT1 IN

Signal to synchronize LSI with commercial power source frequency.

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

16.7 msec

H : GND

L (-5V)

26 P40 IN Connected to VC. 27 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.

28-29 P71-P70 OUT Terminal not used. 30 XIN IN

Internal clock oscillation frequency setting input.

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

31 XOUT OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

32 VSS IN

Power source voltage:-5V.

VC voltage of power source circuit input.

33 P27 IN

Signal coming from touch key.

When any one of G12 line keys on key matrix is touched, a corresponding signal will be input into P27. When no key is touched, the signal is held at "L" level.

34 P26 IN

Signal similar to P27.

When any one of G11 line keys on key matrix is touched, a corresponding signal will be input into P26.

35 P25 IN

Signal similar to P27.

When any one of G10 line keys on key matrix is touched, a corresponding signal will be input into P25.

36 P24 IN

Signal similar to P27.

When any one of G9 line keys on key matrix is touched, a corresponding signal will be input into P24.

37-40 P23-P20 OUT

Digit selection signal.

The relationship between digit signal and digit are as follows;

Digit signal .................................. Digit

P14................................................1st.

ß(60Hz)

P15...............................................2nd.

P16............................................... 3rd.

P17................................................4th.

P20................................................5th.

P21................................................6th.

P22................................................7th.

P23................................................8th.

(ß : INTO signal)

Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal (ß) period, and input to the grid of the fluorescent display.

P14

P15

P16

P17

P20

P21

P22

P23

GND VP

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Pin No. Signal I/O Description

41-44 P17-P14 OUT Digit selection signal.

Signal similar to P23.

45-48 P13-P10 OUT

Segment data signals.

The relation between signals and indicators are as follows:

Signal Segment Signal Segment

P13............... P15 P03................ P7

P12............... P14 P02................ P6

P11............... P13 P01................ P5

P10............... P12 P00................ P4

P07............... P11 P37................ P3

P06............... P10 P36................ P2

P05................. P9 P35................ P1

P04................. P8

(ß : INTO signal)

Refer to the touch control panel circuit about the relation between signals and indicators. Normally, one pulse is output in every synchronized signal (ß) period, and input to the anode of the fluorescent display.

49 P07 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

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

50 P06 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

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

51 P05 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

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

52 P04 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

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

53 P04 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

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

54 P02 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one of G3 line keys on key matrix is touched.

55 P01 OUT Segment data signal. Signal similar to P13.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one of G2 line keys on key matrix is touched.

56 P00 OUT

Segment data signal.

Signal similar to P13.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one of G1 line keys on key matrix is touched.

57-59 P37-P35 OUT Segment data signal. Signal similar to P13. 60-64 P34-P30 OUT Terminal not used.

ß(60Hz)

GND

SERVICING

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1. Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc, and sometimes it is not fully protected by the built-in protection circuit. In order to protect CMOS LSI.

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

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

approx. 1M ohm

2. Shapes of Electronic Components

Transistor DTA123ES KRA101M KRC243M

3. Servicing of Touch Control Panel

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

(1) Servicing the touch control panel with power supply

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

Therefore, before checking the performance of the touch control panel,

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

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

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

After checking the performance of the touch control panel,

1) Disconnect the power supply cord.

2) Open the door and block it open.

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

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

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

6) Run the oven and check all functions.

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

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

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

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

(2) Servicing the touch control panel with power supply

from an external power source:

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

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Hood exhaust  louver

Tab (left )

Tab (right)

Push

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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:

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

1. Disconnect the power supply cord.

2. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).

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

1. Door does not close firmly.

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

3. The door gasket or seal is damaged.

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 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 and Oven cavity.

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 PANAL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED

WITHOUT REMOVING THE OVEN FROM THE WALL

1. Hood lamps, sockets and grease filter.

2. Oven lamp, base cover and hood lamp glass assembly.

3. Turntable motor.

4. Hood exhaust louver.

5. Control panel assembly or components

6. Stirrer cover and stirrer fan.

HOOD EXHAUST LOUVER REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove the one (1) screw holding the hood exhaust louver to the oven cavity with the outer case cabinet.

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4. Pull the hood exhaust louver from the oven cavity by pushing the right and left tabs of the hood exhaust louver

to remove.

5. Now, the hood exhaust louver is free.

REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven)

1. Disconnect the power supply cord, and uncoil the power supply cord.

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

3. Remove the one (1) screw holding the exhaust damper assembly to the rear stay, and remove the exhaust damper assembly by sliding it backward.

4. Remove the two (2) screws holding the oven (outer case cabinet) to the top cabinet.

5. Remove the hood exhaust louver referring to "HOOD EXHAUST LOUVER REMOVAL".

6. While supporting the front of the oven, unfasten the two (2) unit mounting screws holding the oven to the unit mounting plate.

7. Remove the oven by sliding it into the arms of the unit mounting plate and pull the power cord out of the wall cabinet.

8. The oven is now free and can be placed on the work surface selected for servicing the oven.

9. Installation is the reverse of this procedure.

OUTER CASE REMOVAL

Remove the oven from the wall and proceed as follows;

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove one (1) screw holding the hood exhaust louver to the oven, and pull it forward to remove by pushing the right and left tabs of the hood exhaust louver. (Refer to procedure of "HOOD EXHAUST LOUVER REMOVAL".)

4. Remove four (4) screws holding the rear stay to the hood fan motor or the oven, and remove it.

5. Remove the four (4) screws from the rear of the outer case cabinet.

6. Slide the outer case cabinet back about 1 inch (3 cm) to

free it from retaining clips on the cavity face plate.

7. Disconnect the three (3) pin connector of the power supply cord from the wiring harness and remove the power supply cord together with the outer case.

8. Discharge high voltage capacitor.

CAUTION: 1. DISCONNECT OVEN FROM POWER

SUPPLY BEFORE REMOVING OUTER CASE.

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

POWER TRANSFORMER REMOVAL

1. Disconnect the power supply cord, remove the oven from wall, and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer Case Removal".) And proceed as follows.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove one (1) screw holding the hood duct to the oven cavity front flange.

Disconnect the stop switch harness from the chassis support and disconnect the wire leads from the fan motor.

6. Lift up the fan motor side of the hood duct.

7. Disconnect filament leads of transformer from the magnetron and capacitor.

8. Disconnect high voltage leads of capacitor from the transformer.

9. Disconnect wire leads from transformer.

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

HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the 6-pin connector of the hood fan motor from the main wire harness located at the right edge of the hood duct and release the snap band from the hood duct.

Re-install

1. Install by sliding the transformer on the right base plate with its primary terminals toward the outer case.

2. Secure the transformer with two (2) screws to right base plate.

3. Re-connect wire leads (primary and high voltage) to the transformer and filament leads of transformer to magnetron and high voltage capacitor. Refer to "PICTORIAL DIAGRAM".

4. Re-install the hood duct holding the fan motor to the oven cavity front flange with one (1) screw.

5. Reconnect the wire leads to the chassis support and the fan motor, referring to "PICTORIAL DIAGRAM".

6. Re-install the outer case and check that oven is operating properly.

CAUTION: MAKE SURE THE WIRE LEADS NEVER

TOUCH THE FAN BLADE.

5. Remove the hood fan motor from the hood duct by lifting it up.

6. Now, the hood fan motor is free.

7. Remove one (1) screw holding the hood duct to the oven cavity front plate.

8. Release the 6-pin connector and the 3-pin connector of the main harness A from the hood duct.

9. Disconnect the wire leads from the fan motor and chassis support, and release the wire leads from holes of the

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hood duct.

10.Remove the two (2) unit mounting screws from the chassis support (right side) and the hood duct (left side).

11.Remove the one (1) screw holding the chassis support.

12.Remove the chassis support.

13.Remove the hood duct from the oven cavity by lifting it up

14.Screw the oven lamp off from the lamp socket.

15.Remove the lamp socket from the lamp angle.

16.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.

MAGNETRON REMOVAL

1. Disconnect the power supply cord , remove the oven from wall and remove outer case (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal".)

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the fan motor and the chassis support, and release them from the holes of hood duct.

5. Remove the one (1) screw holding the hood duct to the oven cavity front plate, and lift up the fan motor side of the hood duct.

6. Remove the one (1) screw holding the capacitor holder to the hood intake duct.

7. Disconnect the high voltage wire leads of the high voltage rectifier assembly from the magnetron.

17.Now, the oven lamp socket and the hood duct are free.

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flate type small screw driver

8. Disconnect the filament lead of the transformer from the magnetron.

9. Remove the power transformer from the right base plate, referring to "POWER TRANSFORMER REMOVAL".

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

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

CAUTION: WHEN REPLACING THE MAGNETRON, BE

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

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

1. Disconnect the power supply cord , remove the oven from wall and remove outer case (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal".)

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the fan motor and the chassis support, and release them from the holes of hood duct.

5. Remove the one (1) screw holding the hood duct to the oven cavity front flange, and lift up the fan motor side of the hood duct.

6. Disconnect the high voltage wire leads with high voltage rectifier from the magnetron.

7. Disconnect filament lead of the transformer from high

HOOD FAN THERMAL CUT-OUT REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the hood fan thermal

voltage capacitor.

8. Disconnect high voltage wire from capacitor.

9. Remove one (1) screw holding capacitor holder and high voltage rectifier to the hood intake duct.

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

11.Now, the high voltage rectifier assembly is free.

12.Remove capacitor from the holder.

13.Now, the high voltage capacitor is free.

CAUTION: WHEN REPLACING THE HIGH VOLTAGE

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

cut-out.

5. Remove one (1) screw holding the thermal cut-out to the right base plate.

6. Remove the hood fan thermal cut-out from the right base plate.

7. Now, the hood fan thermal cut-out is free.

THERMAL CUT-OUT (CAVITY) REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of

"Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

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Gap

Rotor

Bracket

Stator

Groove joint pliers

Coil

Shaft

Axis

Stator

Rotor

These are the positions that should be pinched with pliers

R-1481 R-1482

3. Discharge high voltage capacitor.

4. Remove two (2) unit mounting screws.

5. Remove the hood duct. (Refer to the procedure of " HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL".

6. Straighten the tab holding the thermal cut-out to the top plate of the oven cavity.

7 . Release the thermal cut-out (cavity) from the one slit of

the oven cavity top plate.

8. Disconnect the wire leads from the thermal cut-out (cavity).

9. Now, the thermal cut-out (cavity) is free.

TEMPERATURE FUSE (MAGNETRON) REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood duct from the oven cavity, referring to the procedure of " HOOD FAN

COOLING FAN MOTOR REMOVAL

NOTE: When the tab is broken or turned off, use the another

tab which is fixed near the slit when the new thermal cut-out is replaced.

Tab

Thermal  Cut-Out

Slit

Thermal  Cut-Out

Tab

Thermal  Cut-Out (Cavity)

Top of Oven Cavity

Waveguide

MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL".

5. Disconnect the wire leads from the temperature fuse (Magnetron).

6. Remove the one (1) screw holding the temperature fuse (Magnetron) to the oven cavity.

7. Now, the temperature fuse (Magnetron) is free.

1. Disconnect the power supply cord, remove the oven from wall and remove outer case (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal".)

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the fan motor and the chassis support.

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

6. Release the wire leads from the hole of the hood duct.

7. Lift up the fan motor side of the hood duct.

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

9. Remove the fan blade from the fan motor shaft according 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 any pieces do not 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.

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

hole (for shaft) may be larger than normal.

13.Now, the fan motor is free.

Rear View

Side View

INSTALLATION

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

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

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

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.

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

CAUTION: * Do not hit the fan blade strongly 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.

R-1480 R-1481 R-1482

6. Install the hood duct to the oven cavity with the one (1) screw.

7. Re-install the wire leads to the hole of the hood duct.

8. Connect the wire leads to the fan motor and chassis support, referring to the pictorial diagram.

9. Refer to procedure of "OUTER CASE REMOVAL". And reverse their procedure. And re-install the outer case.

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove the three (3) screws holding the base cover to the oven cavity

4. Remove the base cover from the oven cavity by pulling

STIRRER MOTOR REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the hood fan motor and the hood duct from the oven cavity, referring to the procedure of " HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL".

Shaft

Table

Center of bracket

down and moving to the left slightly.

5. Disconnect the wire leads from the turntable motor.

6. Remove two (2) screws holding turntable motor to the oven cavity.

7. Now the turntable motor is free.

5. Disconnect the wire leads from the stirrer motor.

6. Remove the two (2) screws holding the stirrer motor to the waveguide of the oven cavity.

7. Remove the stirrer motor from the waveguide.

8. Now, the stirrer motor is free.

9. When installing the stirrer motor, the shaft of stirrer motor must be inserted to the stirrer fan shaft. Refer to the procedure of "STIRRER COVER AND STIRRER FAN INSTALLATION".

STIRRER COVER AND STIRRER FAN INSTALLATION

1. Put the stirrer fan on the stirrer cover to match the stirrer fan shaft to the center of the stirrer support.

2. Insert the shaft of stirrer fan to the shaft of stirrer motor.

3. Insert the cutout of stirrer cover to the tabs on the ceiling.

4. Install the stirrer cover to the oven cavity, and secure it by one canoe clip.

OVEN LAMP REMOVAL

1. Disconnect the power supply cord.

2. Remove one (1) screw holding the hood exhaust louver to oven cavity front flange.

3. Remove the hood exhaust louver from the oven by pushing the right and left tabs of the hood exhaust louver. (Refer to procedure of "HOOD EXHAUST LOUVER

CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL

1. Disconnect the power supply cord.

2. Open the door and block it open.

3. Remove one (1) screw holding the hood exhaust louver to oven cavity front flange.

4. Remove the hood exhaust louver from the oven by pushing the right and left tabs of the hood exhaust louver. (Refer to procedure of "HOOD EXHAUST LOUVER REMOVAL")

5. Remove one (1) screw holding the control panel to the oven cavity front face plate.

6. Release the control panel from the oven cavity front face plate by lifting it up.

7. Disconnect the wire leads from the relays RY1 and RY2.

Shaft

Stirrer Fan Stirrer Support

Stirrer  Cover

Canoe Clip

REMOVAL")

4. Lift the oven lamp cover up.

5. Now, the oven lamp and the socket are found.

6. Screw the oven lamp off from the lamp socket.

7. Now, the oven lamp is free.

8. Disconnect the connectors CN-A, CN-B, CN-E and CNF from the control unit.

9. Remove the control panel assembly from the oven.

10.Now, the control panel assembly is free.

11.Disconnect the connector CN-G from the control unit.

12.Remove four (4) screws holding the control unit to the key fixing plate.

13.Release the two (2) tabs holding the control unit to the key fixing plate.

14.Now, the control unit is free.

15.Remove the one (1) screw holding the key fixing plate to the control panel.

16.Release the four (4) tabs holding the key fixing plate to

R-1480

Terminal

Push

Pull down

Lever

Positive lock® connector

R-1481 R-1482

the control panel.

17.Remove the key fixing plate from the control panel.

18.Tear the key unit from the key fixing plate.

19.Now, the key unit is free

NOTES FOR KEY UNIT REPLACEMENT

1. Do not reuse the torn key unit because the performance of the adhesive becomes weak.

2. Before attaching a new key unit, wipe off remaining adhesive on the key fixing plate surfaces completely with a soft cloth soaked in alcohol.

3. When attaching the key unit to the key fixing plate, adjust the upper edge and right edge of the key unit to the correct position of key fixing plate.

4. Stick the key unit firmly to the key fixing plate by rubbing with soft cloth not to scratch.

NOTES FOR NEW CONTROL UNIT REPLACEMENT

1. Before installation of the new CPU into the control panel, grasp the middle section between thumb and finger, bend the display board forward a until b breaks as shown in step 1.

2. To remove the middle section push both sides of the middle section towards d until c breaks as shown in step 2.

NOTE: Discard the middle section.

3. After removing the middle section, bend the display board 90˚, positioning the jumper wires into the notches

of the display board as shown in step 3.

4. Insert the bottom edge of the display board under the tab of control panel as shown in step 4.

5. Place the top edge of the display board on the clip (F). And press the display board downward as shown in step

4. (Holes in middle of display board should be positioned into locator pins.)

6. After installing display board, press the CPU downward 90˚ until CPU is locked into place by the clips.

7. Hold the CPU with the four (4) screws.

8. After installing CPU, make sure jumper wires are not bent, touching or broken.

Top edge of the display board

Display Board

Middle section

LSI

Control Unit

CN-G

b c

Break point

Jumper wires

Middle Section

Jumper

Notches

wires

Control  panel

Clip (E)

Clip (F)

Locator pin

STEP 1 STEP 2 STEP 3 STEP 4

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

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

DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

Positive lock® connector

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the control panel assembly, referring to the

R-1480 R-1481 R-1482

procedure of "CONTROL PANEL ASSEMBLY , CONTROL UNIT AND KEY UNIT REMOVAL".

5. Remove the two (2) screws holding the latch hook to the oven cavity front flange.

6. Remove the latch hook from the oven cavity front flange.

7. Disconnect the wire leads of each switch.

8. Remove each switch from the latch hook by pushing the one (1) stopper tub holding each switch.

9. Now, each switch is free.

Re-install

switch is in the lower position, door sensing switch is in the upper position and the monitor switch is in the middle position.

2. Re-connect wire leads to each switch. Refer to pictorial diagram.

3. Secure the latch hook (with two (2) mounting screws) to oven cavity front flange.

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

1. Re-install each switch in its place. The secondary interlock

DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the control panel assembly, referring to the procedure of "CONTROL PANEL ASSEMBLY , CONTROL UNIT AND KEY UNIT REMOVAL".

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.

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

6. 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 monitor switch is activated with the door closed.

7. Secure the screws with washers firmly.

8. Check all of the switches operation. If any 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. The contact of door sensing switch and secondary interlock switch open within 1.2mm gap between right side of cavity face plate and door when door is open.

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

Latch Hook

Latch Heads

Door

Door Sensing Switch

Monitor Fuse

Monitor Switch

Secondary Interlock Switch

Figure C-1. Latch Switch Adjustments

DOOR REPLACEMENT

DOOR ASSEMBLY REMOVAL

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the hood exhaust louver from the oven cavity by pushing the right and left tabs of the hood exhaust louver. (Refer to the procedure of "HOOD EXHAUST LOUVER REMOVAL".)

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

6. Lift up the door stopper.

7. Now, the door stopper is free from the door assembly.

8. Lift up the door assembly to release the upper and lower door hinge pins from the upper and lower oven hinges.

9. Now, the door assembly is free.

Note: When the individual parts are replaced, refer to

"Door Disassembly".

DOOR ASSEMBLY RE-INSTALL

1. On re-installing door, insert the lower oven hinge to lower door hinge pin.

2. Insert the upper oven hinge to the upper door hinge pin.

3. Shut the door (close the contacts of interlock switches).

4. Make sure upper and lower oven hinges are inserted into the upper an lower door hinge pins.

5. Make sure the door is parallel with oven face lines (left and upper side lines) and door latch heads pass through

R-1480

Upper Door Hige Pin

Upper  Oven Hige

Lower  Oven Hige

Lower Door Hige Pin

RE-INSTALL

Door Stopper

Door assembly

Latch Heads

Hood Exhaust Louver

Tab

Choke Cover

Door Frame

Door Stopper

Putty Knife

R-1481 R-1482

latch holes correctly.

6. Re-install the door stopper to the door assembly.

7. Re-install the hood exhaust louver to the oven cavity front face plate.

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.

After any servicing, 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 face plate is to be less than 1.0mm.

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

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

Note: The door on a microwave oven is designed to

act as an electronic seal preventing the leakage

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

Figure C-2. Door Replacement and adjustment

DOOR DISASSEMBLY

1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal")

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the hood exhaust louver from the oven cavity by pushing the right and left tabs of the hood exhaust louver. (Refer to the procedure of "HOOD EXHAUST LOUVER REMOVAL".)

5. Remove door assembly, refer to "Door Replacement". Replacement of door components are as follows:

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

Note: As the engaging part of choke cover and door frame

are provided at 15 places, do not force any particular part.

CHOKE COVER

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

8. Pry the principles of the lever and lift up the choke cover by inserting a putty knife in order shown in Figure C-3.

9. Now choke cover is free from door panel and door frame.

DOOR FRAME

10.Remove six (6) screws holding the door panel and the door handle to the door frame assembly.

11.Release the door frame assembly from the door panel.

NOTE: It is easier to release the engaging parts of the upper

or lower door hinge pin side at first.

12.Now, door frame assembly is free.

LATCH SPRING, LATCH HEAD AND DOOR PANEL

13.Release the latch spring from the tab of the latch head and tab of the door frame.

14.Release the latch head from the door frame.

15.Now, the latch spring, latch head and door frame are free.

Figure C-3. Door Disassembly

DOOR GLASS

16.Remove the glass stopper from the door frame by releasing the tab of door frame.

17.At first, slide the door glass toward the glass stopper side, and then slide it up. And release it from the right and lower long tabs of the door frame.

18.Release the door glass from the upper long tab of the door frame.

19.Release the door glass from the long tabs of the door frame.

20.Now, the door glass is free.

R-1480 R-1481 R-1482

Power Supply

cord 120V 60Hz

BLK 3

BLK

WHT 2

WHT

GRN

HOOD FAN MOTOR

BLK

YLW

456

YLW

WHT

BLK

BLU 1

BLU

RED

ORG

Blue 

RED

WHT

OVEN LAMP & SOCKET

Marking

STIRRER MOTOR

CAVITY

THERMAL

CUT-OUT

BLK RED

RED

WHT

REDRED

MAGNETRON

TEMPERATURE 

FUSE

HIGH

VOLTAGE

RECTIFIER

HIGH VOLTAGE

CAPACITOR

HIGH VOLTAGE

WIRE A

RED

POWER 

TRANSFORMER

W W

MAGNETRON

HIGH VOLTAGE COMPONENTS

FAN

WHT

MOTOR

WHT

RED

HOOD FAN

THERMAL

ORG

H

GRY

WHT

ORG

HOOD LAMPS

& SOCKETS

CUT-OUT

ORG

Blue Marking

WHT

ORG

BLK

WHT

GRN

CN-E

to Chassis Support

GRN

RED 1

RED

GRN

N.O.

COM.

DOOR SENSING SWITCH

CN-B

BLU

ORG

WHT

G

WHT

R

RED

TURNTABLE

MOTOR

WHT

GRY

WHT

RED

RY1

ORG

N.O.

RY1

RED

COM.

WHT

N.C.

BLK

COM.

RY2

RED

N.O.

MONITOR

SWITCH

ORG

RY2

COM.

N.O.

COM.

SECONDARY

to Right Base Plate

INTERLOCK

SWITCH

BLK

RED

BLK

ORG

WHT

CN-A

345

BLK

FUSE & HOLDER

BLK

WHT

YLW

34567

C100

CN-A

RED

1 357

Figure S-1. Pictorial Diagram

IC1

IC2

CN-G

1132

CN-E

CN-F

CN-E

PRIMARY

INTERLOCK

RY2:

CN-B

RELAY

RY4

RY5

N.O.

RY1RY2

N.O.

COM.

R-1480 R-1481 R-1482

: IF NOT SPECIFIED 1/8w ± 5%

: IF NOT SPECIFIED 1SS270A

Note

: IF NOT SPECIFIED 0.01µF/16v

C10 0.1µ/50v



29 8G 28 7G 27 6G 26 5G 25 4G 24 3G 23 2G 22 1G

OFF HELP

20 P15 19 P14

17 P13

TURNTABLE

16 P12 15 P11

13 P10

MIX CONV COOK LBS KG

12 P9 11 P8

10 P7 9 P6 8 P5 7 P4 6 P3 5 P2 4 P1

Fluorescent display tube

VF2

VF1

1. 2 F

33. 32 F

R10 3.3 1/2w

R93 100k

R92 100k

R91 100k

P30

P31

P32

P33

P34

P35

P36

P37

P00

P01

P02

P03

P04

P05

P06

AN3

AN2

AN1

AN0

P55

P54

P53

AN7

AN6

AN5

AN4

VEE

VCC

VREF

AVSS

R83 3.3k

D77

LIGHT

D76

D752

D74

D73

D72

D71

WORK

172

HELP

CUSTOM

FAST

BREAK

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

R73 3.3k

R72 3.3k

R71 3.3k

R70 3.3k

C73 330pF

R82 3.3k

R81 3.3k

R80 3.3k

R79 3.3k

R78 3.3k

R77 3.3k

P07

P10

P11

P12

P13

P14

P15

P16

P17

P20

P21

P22

P23

P24

P25

P26

P40

P71

RESET

P27

32 33

XIN

P70

VSS

XOUT

IZA876DR IC1

P52

P51

P50

P47

P46

P45

P44

P43

P42

INT1

FAN

LIGHT

NIGHT

HI / LO



STOP

TURN

TABLE

CLEAR

ON / OFF

LEVEL

TIMER

CLOCK

POWER

KITCHEN

COMPU

DEFROST

POPCORN

&

COOK

COMPU

REHEAT

SNACKS

C72 330pF

C71 330pF

START

TOUCH ON

PLUS

MINUTE

G12 G11 G10 G 9

C70 330pF

Q4

DTA123ES

R1 4.3k 1/2w

10G471K

VRS1

A 7

C6 10µ/35v

–

ZD3 HZ5C2



C2 1000µ/35v

–

C1 0.1µ/50v

(J1)

D1-D4

4.7k R7

HZ4A2 ZD4

11ES1

R4 510 1/2wR3 750 1w

ZD1 HZ6A3

C100

A 1

7µ/230v

4.7k R8

Q20

KRA101M

CF1

KRC243M

N.O.

RY2

CST4.00MGW

C30

N.O.

Q28

KRA101M

COM

R30 15k

R31 4.7k

Figure S-2. Control Panel Circuit

D31

DOOR

SWITCH

E 1 E 2

D30

(J15)

(J7)

KRA101M



SSR1

C110 0.033µ/250v

R110 47 1/2w

B 9

R20

(J5) (J3) (J6) (J4) (J2)

1k 1/2w

C110

Q25

KRA101M

S101D01

R110

C21 0.1µ/50v

–

Q30

KRA101M

C20 10µ/35v

–

Q26

KRA101M

D25D26D27D28

RY4

RY5

NO NC

B 7

B 5

B 3

HIGHLOW

Q27

RY1

B 1

COM



Q3

KRA101M

/50v

0.1µ C9

Q40

KRA101M

R40 3.3k

SP40

Q24

D20

RY3

A 3

A 5

MOTOR RUN

CAPACITOR

TURNTABLE

MOTOR

HOOD LAMP

COM

HOOD THERMO

HOOD MOTORCOM(H)

FAN MOTOR

OVEN LAMP

STIRRER MOTOR

MICRO

R-1480 R-1481 R-1482

DIP

QKITPB027MRE0

(J10)

HOOD

LAMP

COM

HOOD

THERM

HOOD

MHIGH

HOOD

MLOW

D77

(J14)

753 19

CN - B

D27

(D70)

D71 D72 D73 D74 D75 D76

CN - G

(CN - B)

D28

RY2

C71C73

SSR1

R77 R78 R79 R80 R81 R82

R83

R70 R71 R72

R73

C72

E E

C70

C110

(R76)

R93

(J6)

R31

Q26

3 1

R110

RY4

RY5

RY1

1914151617

20212223242526

,BFB

(IC2)

R91

R92

(J4)

(J2)

Q24 Q25

R20

(CN - G)

OLMICRO

(J5)

(J7)

(J3)

R30

AC(H)

D26

Q27

(R100)

C30

D31

D25

C20

27 28 29

30 31

(J11)

Q20

C21

Q30

D30

CN - E

(R2)

(ZD2)

4356

D20

(J1)

RY3

(J12)

(J15)

357

23456789101112

CF1

R40

CN - A

ZD4

SP40

C100

(CN - A)

ZD3

D4 D1

(J13)

R10

C10

ZD1

IC1

Q28

Q40

(Q1)

S1 S2

(470V) VRS1

AC(N) TTM

Figure S-3. Printed Wiring Board

PARTS LIST

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

The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION

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

ELECTRIC PARTS

1- 1 FH-DZB012MRY0 M High voltage rectifier assembly 1 AK

1- 2 RC-QZA173WRE0 M High voltage capacitor 1 AR

1- 3 QFS-TA013WRE0 M Temperature fuse 150˚C (Magnetron) 1 AG 1- 4 RMOTDA182WRE0 M Turntable motor 1 AQ 1- 5 RMOTDA214WRE0 M Stirrer motor 1 AQ 1- 6 RTHM-B005MRE0 M Thermal cut-out N.O. 60˚C (Hood Fan) 1 AG 1- 7 RTRN-B055MRE0 M Power transformer 1 BE

∆

1- 8 RV-MZA280WRE0 M Magnetron 1 BD

1- 9 QFSHDB003MRE0 M Fuse holder 1 AD 1-10 QSW-MA110WRE0 M Secondary interlock and door sensing switches 2 AE 1-11 FFS-BA016/KIT M Monitor switch with fuse assembly 1 AF 1-12 FACCDB011MRE0 M Power supply cord 1 AP 1-13 QSOCLB006MRE0 M Oven lamp socket 3 AE 1-14 FMOTEA366WRK0 M Hood fan motor 1 BE 1-15 RMOTEA346WRE0 M Fan motor 1 AR 1-16 RLMPTA071WRE0 M Oven lamp 3 AG 1-17 RTHM-A080WRE0 M Thermal cut-out 145˚C (Cavity) 1 AG

CABINET PARTS

2- 1 LSTY-B021MRP0 M Rear stay 1 AF 2- 2 PDIF-B018MRF0 M Hood exhaust louver [R-1480] 1 AT 2- 2 PDIF-B019MRF0 M Hood exhaust louver [R-1481] 1 AT 2- 2 PDIF-B020MRF0 M Hood exhaust louver [R-1482] 1 AT 2- 3 GDAI-B045MRP0 M Right base plate 1 AM 2- 4 PCUSUB040MRP0 M Base cover cushion 1 AA 2- 5 GCABUB084MRP0 M Outer case cabinet [R-1480] 1 BA 2- 5 GCABUB085MRP0 M Outer case cabinet [R-1481] 1 BB 2- 5 GCABUB086MRP0 M Outer case cabinet [R-1482] 1 BC 2- 6 TMAPCB052MRR0 M Schematic diagram 1 AB 2- 7 FANGKB009MRY0 M Hood lamp glass assembly [R-1480] 1 AN 2- 7 FANGKB010MRY0 M Hood lamp glass assembly [R-1481] 1 AM 2- 7 FANGKB011MRY0 M Hood lamp glass assembly [R-1482] 1 AM 2-7-1 LANGQB016MRP0 M Hood lamp glass angle [R-1480] 1 AG 2-7-1 LANGQB020MRP0 M Hood lamp glass angle [R-1481] 1 AG 2-7-1 LANGQB027MRP0 M Hood lamp glass angle [R-1482] 1 AG 2-7-2 PGLSPB004MRE0 M Hood lamp glass 1 AH 2- 8 PCOVPB064MRt0 M Base cover [R-1480] 1 AY 2- 8 PCOVPB066MRt0 M Base cover [R-1481] 1 AY 2- 8 PCOVPB067MRt0 M Base cover [R-1482] 1 AY

CONTROL PANEL PARTS

3- 1 DPWBFB081MRU0 M Control unit 1 BL 3- 1A QCNCMA447DRE0 M 4-pin connector CN-A 1 AA 3- 1B QCNCMA448DRE0 M 5-pin connector CN-B 1 AA 3- 1C QCNCMA275DRE0 J 2-pin connector CN-E 1 AB 3- 1D QCNCWA030DRE0 J 12-pin connector CN-G 1 AE 3- 1E RV-KXB004MRE0 M Fluorescent display tube 1 AS 3- 1F PTPEHB010MRE0 M Tape 2mm 1 AB C1 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 1 AB C2 VCEAB31VW108M J Capacitor 1000 uF 35V 1 AF C5 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C6 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB C7-8 VCKYD11CY103N J Capacitor 0.01 uF 16V 2 AH C9-10 RC-KZA087DRE0 J Capacitor 0.1 uF 50V 2 AB C20 VCEAB31VW106M J Capacitor 10 uF 35V 1 AB C21 VCEAB31HW104M J Capacitor 0.1 uF 50V 1 AM C30 VCKYD11CY103N J Capacitor 0.01 uF 16V 1 AH C70-73 VCKYD11HB331K J Capacitor 330 pF 50V 4 AA C100 RC-QZB014MRE0 M Capacitor 7 uF 230V 1 AK C110 RC-QZB019MRE0 M Capacitor 0.033 uF 250V 1 AC CF1 RCRS-A010DRE0 J Ceramic resonator (CST4.00MGW) 1 AD D1-4 VHD11ES1///-1 J Diode (11ES1) 4 AB D20 VHD1SS270A/-1 J Diode (1SS270A) 1 AA D25-28 VHD1SS270A/-1 J Diode (1SS270A) 4 AA D30-31 VHD1SS270A/-1 J Diode (1SS270A) 2 AA D71-77 VHD1SS270A/-1 J Diode (1SS270A) 7 AA

R-1480 R-1481 R-1482

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

IC1 RH-IZA876DRE0 J LSI 1 AW Q3 VSKRA101M//-3 J Transistor (KRA101M) 1 AB Q4 VSDTA123ES/-3 J Transistor (DTA123ES) 1 AA Q20 VSKRA101M//-3 J Transistor (KRA101M) 1 AB Q24-26 VSKRA101M//-3 J Transistor (KRA101M) 3 AB Q27 VSKRC243M//-3 J Transistor (KRC243M) 1 AB Q28 VSKRA101M//-3 J Transistor (KRA101M) 1 AB Q30 VSKRA101M//-3 J Transistor (KRA101M) 1 AB R1 VRD-B12HF432J J Resistor 4.3k ohm 1/2W 1 AH R2 VRD-B12EF152J J Resistor 1.5k ohm 1/4W 1 AA R3 VRS-B13AA751J J Resistor 750 ohm 1W 1 AH R4 VRD-B12HF511J J Resistor 510 ohm 1/2W 1 AB R7-8 VRD-B12EF472J J Resistor 4.7k ohm 1/4W 2 AA R10 VRD-B12HF3R3J J Resistor 3.3 ohm 1/2W 1 AH R20 VRD-B12HF102J J Resistor 1k ohm 1/2W 1 AA R30 VRD-B12EF153J J Resistor 15k ohm 1/4W 1 AA R31 VRD-B12EF472J J Resistor 4.7k ohm 1/4W 1 AA R40 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 1 AA R70-73 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 4 AA R77-83 VRD-B12EF332J J Resistor 3.3k ohm 1/4W 7 AA R91-93 VRD-B12EF104J J Resistor 100k ohm 1/4W 3 AA R110 VRS-A12HA470J J Resistor 47 ohm 1/2W 1 AH RY1-2 RRLY-A113DRE0 M Relay (DU24D1-1PR(M)) 2 AG RY3-4 RRLY-A080DRE0 J Relay (OJ-SH-124LM) 2 AG RY5 RRLY-A112DRE0 M Relay (VE24HSE-K) 1 AH SSR1 RH-SZA009DRE0 M Solid state relay 1 AG SP40 RALM-A014DRE0 J Buzzer (PKM22EPT) 1 AG T1 RTRNPB014MRE0 M Transformer 1 AM VRS1 RH-VZA032DRE0 J Varistor (10G471K) 1 AE ZD1 VHEHZ6A3///-1 J Zener diode (HZ6A-3) 1 AC ZD3 VHEHZ5C2///-1 J Zener diode (HZ5C-2) 1 AA ZD4 VHEHZ4A2///-1 J Zener diode (HZ4A-2) 1 AA 3- 2 FPNLCB205MRK0 M Control panel sub. assembly [R-1480] 1 AZ 3- 2 FPNLCB211MRK0 M Control panel sub, assembly [R-1481] 1 AZ 3- 2 FPNLCB212MRK0 M Control panel sub, assembly [R-1482] 1 AZ 3- 2-1 FUNTKB153MRE0 M Key unit [R-1480] 1 AU 3- 2-1 FUNTKB159MRE0 M Key unit [R-1481] 1 AU 3- 2-1 FUNTKB160MRE0 M Key unit [R-1482] 1 AU 3- 2-2 GMADIB030MRF0 M Display window 1 AF 3- 3 XEPSD30P10XS0 M Screw; 3mm x 10mm 5 AB

OVEN PARTS

4- 1 FFTA-B003MRK0 M Exhaust damper assembly 1 AH 4- 2 FROLPB024MRK0 M Turntable support assembly 1 AK 4- 3 NTNT-A090WRE0 M Turntable tray 1 AN 4- 4 LANGKB010MRP0 M Capacitor holder 1 BB 4- 5 FCOVPB012MRY0 M Stirrer cover assembly 1 AK 4- 6 FFAN-B006MRK0 M Stirrer fan assembly 1 AL 4- 7 ************* M Oven cavity (Not replaceable part) 1 --

∆

4- 8 PPACGB014MRF0 M Turntable motor packing 1 AA 4- 9 PHOK-B017MRF0 M Latch hook 1 AG

∆

4-10 LANGTB036MRP0 M Unit mounting plate 1 AP 4-11 NFANPB001MRE0 M Fan blade 1 AC 4-12 LBSHC0037WRE0 M Cord bushing 1 AB 4-13 PCOVPB065MRP0 M Oven lamp cover 1 AD 4-14 PDUC-B077MRP0 M Hood intake duct 1 AG 4-15 PCUSUB039MRP0 M Hood intake duct cushion 2 AA 4-16 PFILWB005MRP0 M Lamp filter 1 AB 4-17 PSKR-B012MRP0 M Magnetron air guide 1 AB 4-18 LANGTB040MRP0 M Chassis support 2 AE 4-19 PDUC-B078MRF0 M Hood duct 1 AX 4-20 PCUSUB043MRP0 M Hood duct cushion 1 AB 4-21 LSTPPB031MRF0 M Door stopper 1 AC 4-22 PCUSUB045MRP0 M Cushion 1 AE

DOOR PARTS

∆

5 CDORFB203MRK0 M Door assembly [R-1480] 1 BD

∆

5 CDORFB205MRK0 M Door assembly [R-1481] 1 BE

∆

5 CDORFB206MRK0 M Door assembly [R-1482] 1 BE

∆

5- 1 FDORFB060MRT0 M Door panel assembly 1 AX

∆

5- 2 FCOV-B125MRK0 M Door frame assembly [R-1480] 1 AS

∆

5- 2 FCOV-B127MRK0 M Door frame assembly [R-1481] 1 AS

∆

5- 2 FCOV-B128MRK0 M Door frame assembly [R-1482] 1 AS

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

5-2-1 PGLSPB012MRE0 M Front door glass [R-1480] 1 AQ

∆

5-2-1 PGLSPB014MRR0 M Front door glass [R-1481] 1 AQ

∆

5-2-1 PGLSPB013MRR0 M Front door glass [R-1482] 1 AQ 5-2-2 LSTPPB030MRF0 M Latch head 1 AC 5-2-3 LSTPPB032MRF0 M Glass stopper 1 AC 5-2-4 MSPRTA046WRE0 M Latch spring 1 AB

∆

5- 3 GCOVHB035MRF0 M Choke cover 1 AG 5- 4 PSHEPB024MRE0 M Sealer film 1 AF 5- 5 JHNDPB007MRF0 M Door handle [R-1480] 1 AK 5- 5 JHNDPB008MRF0 M Door handle [R-1481] 1 AK 5- 5 JHNDPB009MRF0 M Door handle [R-1482] 1 AK 5- 6 XCPSD40P08000 M Screw : 4mm x 8mm 6 AA

MISCELLANEOUS

6- 1 CFZK-B131MRK0 M Installation material assembly 1 AM 6-1-1 LBSHC0040MRE0 M Grommet 1 AC 6-1-2 LX-BZ0195WRE0 M Toggle screw 4 AC 6-1-3 LX-MZ0001WRE0 M Cord holder 1 AC 6-1-4 XBRSD50P60000 M Screw : 5mm x 60mm 2 AC 6-1-5 XOTSD40P12000 M Screw : 4mm x 12mm 1 AA 6-1-6 XTSSD50P35000 M Screw : 5mm x 35mm 6 AA 6-1-7 XWHSD50-16300 M Washer 2 AA 6- 2 TINSEB177MRR0 M Installation instruction 1 AB 6- 3 TINSEB178MRR0 M Operation manual 1 AD 6- 4 TINSKB047MRR0 M Top template 1 AC 6- 5 TINSKB048MRR0 M Wall template 1 AB 6- 6 QW-QZB023MRE0 M High voltage wire A 1 AD

6- 7 FW-VZB145MRE0 M Main harness A 1 AU 6- 8 TCAUAA025WRR0 M Caution label 2 AA 6- 9 TCAUAB015MRR0 M Monitor caution label 1 AA 6-10 TCAUAB005MRR0 M DHHS caution label 1 AB 6-11 FW-VZB149MRE0 M Stop switch harness 1 AM 6-12 PFIL-B004MRE0 M Chacoal filter 1 AH 6-13 PFIL-B002MRE0 M Grease filter 1 AF 6-14 PCLIC0020MRE0 M Canoe clip 1 AA

SCREWS,NUTS AND WASHERS

7- 1 XCPSD40P08000 M Screw : 4mm x 8mm 3 AA 7- 2 XOTSF40P12000 M Screw : 4mm x 12mm [R-1480] 4 AB 7- 2 XOTSE40P12000 M Screw : 4mm x 12mm [R-1481] 4 AA 7- 2 XOTSD40P12000 M Screw : 4mm x 12mm [R-1482] 4 AA 7- 3 XOTSD40P12000 M Screw : 4mm x 12mm 24 AA 7- 4 XBTSD40P08000 M Screw : 4mm x 8mm 2 AA 7- 5 LX-CZA038WRE0 M Special screw 4 AA 7- 6 LX-CZ0052WRE0 M Special screw 2 AA 7- 7 LX-BZ0081YBE0 M Screw : 4mm x 8mm 5 AA 7- 8 XCPSD30P08000 M Screw : 4mm x 8mm 4 AA 7- 9 LX-BZB012MRE0 M Unit mounting screw 2 AD

R-1480 R-1481 R-1482

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.

R-1480 R-1481 R-1482

OVEN AND CABINET PARTS

1-3

4-13

4-19

4-11

1-15

4-18

7-3

1-14

7-4

7-1 1-16

1-17

1-5

7-3

4-1

7-3

2-1

7-5

7-3

4-10

2-5

4-12

1-12

2-6

1-13

7-8

1-3

6-10

7-3

7-5

4-6

7-9

6-12

4-5

6-14

4-7

4-16

2-2

4-3

6-13

4-2

1-13

1-16

7-9

4-8 1-4

6-8

7-8

2-8

2-7-2

2-7

7-2

4-20

1-8

6-9

7-6

4-9

1-10

1-9

4-22

7-8

4-17

7-3

7-7

1-10

4-4

7-1

1-11

1-2

1-7

7-8

1-1

1-6

7-3

2-4

2-3

7-3

6-13

7-2

2-7-1

4-18

7-3

4-14

4-15

R-1480

6-6

6-7

6-11

6-1

5-6

5-4

5-3

4-21

5-1

5-2-1

5-2

5-5

5-6

6-1-1

5-2-4

5-2-2

5-2-3

6-1-2

6-1-3

6-1-7

6-1-5

6-1-6

6-1-4

3-2-2

3-2-1



3 - 3

3 - 2

3 - 1

7 - 3

3-1E

R-1481 R-1482

CONTROL PANEL PARTS

DOOR PARTS

MISCELLANEOUS

R-1480 R-1481 R-1482

PACKING AND ACCESSORIES

DOOR PROTECTOR

SPADP0221MRE0

TOP PAD SPADBB026MRE0

6-1

INSTALL MATERIAL ASSEMBLY

6-3

OPERATION MANUAL

6-5

WALL TEMPLATE

INSTALLATION INSTRUCTION

6-2

6-4

TOP TEMPLATE

6-13

GREASE FILTER (x 2)



TRAY PACK

SPADPB037MRE0

4-3

TURNTABLE TRAY

Non-replaceable items

WRAP COVER SSAKH0103MRE0

BOTTOM PAD SPADBB025MRE0

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.

PACKING CASE

'98 SHARP CORP. (3S2.530E) Printed in U.S.A

Sharp R-1480, R-1482, R-1481 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual