SHARP R320D, R-320DK, R-320DQ Service Manual

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SER VICE MANU AL

S1002R320DPW/

MICROWAVE OVEN

R- 320DK R-320DQ R-320DW

MODELS

R-320DK R-320DQ R-320DW

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

R-320DW

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 ............................................................................................................................10

TEST PROCEDURE............................................................................................................................................11

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

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................27

PICTORIAL DIAGRAM ........................................................................................................................................33

POWER UNIT CIRCUIT ......................................................................................................................................34

CPU UNIT CIRCUIT ............................................................................................................................................35

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

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

PACKING AND ACCESSORIES .........................................................................................................................41

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..)

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-320DK R-320DQ R-320DW

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

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

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

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

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

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

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

performed on each oven prior to release to the owner.

BEFORE SERVICING

Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.

If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and 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-320DK R- 320DQ R-320DW

Before Servicing

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.

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

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

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

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

When the testing is completed,

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reinstall the outer case (cabinet).

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

7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components during testing.

2. Reinstall the outer case (cabinet).

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

4. Run the oven and check all functions.

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

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

R-320DK R-320DQ R-320DW

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-320DK R- 320DQ R-320DW

MICROWAVE OVEN

R-320DK/ R-320DQ/ R-320DW

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-320DK, R-320DQ, R-320DW.

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

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

WARNING

Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is no other visible damage with the oven.

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

DANGER

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

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST

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

Removal of the outer wrap gives access to voltage above 250V. All the parts marked “∆” on parts list may cause undue microwave

exposure, by themselves, or when they are damaged, loosened or removed.

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

R-320DK R-320DQ R-320DW

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts / 14 Amperes

60 Hertz Single phase, 3 wire grounded

Power Output 1150 watts (IEC TEST PROCEDURE)

Operating frequency of 2450MHz

Case Dimensions Width 20-1/2"

Height 11-7/8" Depth 17-1/8"

Cooking Cavity Dimensions Width 14-3/4"

Height 8-3/4"

1.2 Cubic Feet Depth 15-3/4" 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

REHEAT SENSOR pad, CUSTO, HELP pad COMPU DEFROST pads, SENSOR COOK pads INSTANT ACTION pads, Number selection pads KITCHEN TIMER pad, CLOCK pad, MINUTE PLUS pad POWER LEVEL pad, STOP/CLEAR pad, START pad

Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized

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

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

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

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

Electrical Requirements The electrical requirements are a 120 volt 60 Hz, AC only, 15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances. A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to

contact a qualified electrician and have it replaced with a properly

grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.

3-Pronged Plug

Grounded Receptacle Box

R-320DK R- 320DQ R-320DW

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-

MOVE THE ROUND GROUNDING PRONG FROM THIS PLUG.

1. Door open handle. Pull to open door.

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

3. Removable turntable support.

4. Removable turntable. The turntable will rotate clockwise or counterclockwise.

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

6. Oven door with see-through window.

7. Ventilation openings. (Rear)

8. Auto-Touch control panel.

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

OVEN DIAGRAM

10.Coupling.

11.Wave guide cover.

12.Power supply cord

TOUCH CONTROL PANEL

Grounding Pin

3-Pronged Receptacle

See note

NOTE: The directed features are disabled after one minute when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.

See note

R-320DK R-320DQ R-320DW

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 "SHARP SIMPLY THE BEST PRESS CLEAR AND PRESS CLOCK".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 by touching the NUMBER pads. Program the power level by touching the POWER LEVEL pad and then a Number pad. When the START pad is touched, the following operations occur:

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

RELAY CONNECTED COMPONENTS RY-1 oven lamp/turntable motor/fan motor RY-2 power transformer

2. 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.1 volts A.C. output on the filament winding, and approximately 2370 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, the monitor switch, door sensing switch, secondary interlock switch, relay (RY1) and primary interlock relay are activated with the following results. The circuits to the turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

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

(1)

When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close.

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

monitor switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch

close. And contacts of the relay (RY1) open. If the secondary interlock switch and primary interlock relay (RY2) fail with the contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, secondary interlock switch, relay (RY1) 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 (RY-2) which is operated by the control unit within a 32 second time base. Microwave power operation is as follows:

VARI-MODE ON TIME OFF TIME

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

SENSOR COOKING CONDITION

Using the SENSOR function, the food is cooked without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works: (POTATOES)

1. Potates at room temperature. Vapor is emitted very slowly.

MICROWAVE

2. Heat Potates. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks.

AH SENSOR

MICROWAVE

3. Sensor detects moisture and humidity and calculates cooking time and variable power.

R-320DK R- 320DQ R-320DW

Cooking Sequence.

1. Touch one of the SENSOR pads. NOTE: The oven should not be operated on SENSOR

immediately after plugging in the unit. Wait two minutes before cooking on SENSOR.

2. The coil of shut-off relay (RY-1) is energized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.

3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced and first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor.

NOTE: During this first stage, do not open the door or touch

STOP/CLEAR pad.

4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time and the timer counts down to zero. At this time, the door may be opened to stir, turn, or season food.

5. When the timer reaches zero, an audible signal sounds. The shut-off relay and cook relay are de-energized and the power transformer, oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display and the oven will revert to an OFF condition.

R-320DK R-320DQ R-320DW

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

THERMAL CUT-OUT (OVEN)

CONTROL UNIT

OVEN

OL FM

LAMP

SECONDARY INTERLOCK SWITCH

120V AC 60 Hz

GRN

MONITOR FUSE 20A

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "HIGH"

4. "START" PAD TOUCHED

THERMAL CUT-OUT (MG.)

TTM

(RY-1)

TURNTABLE MOTOR

N.O.

FAN MOTOR

(RY-2)

COM.COM.

SH-B SH-A

PRIMARY INTERLOCK RELAY

DOOR SENSING SWITCH

N.O.

AH SENSOR

MONITOR SWITCH

Figure O-1. Oven Schematic-Off Condition

POWER TRANSFORMER

CAPACITOR 0.94µF

AC 2300V

RECTIFIER

MAGNETRON

120V AC 60 Hz

GRN

MONITOR FUSE 20A

THERMAL CUT-OUT (OVEN)

CONTROL UNIT

OVEN

OL FM

LAMP

SECONDARY INTERLOCK SWITCH

Figure O-2. Oven Schematic-Cooking Condition

THERMAL CUT-OUT (MG.)

(RY-1)

TTM

TURNTABLE MOTOR

COM.

N.O.

FAN MOTOR

(RY-2)

COM.

SH-B SH-A

PRIMARY INTERLOCK RELAY

DOOR SENSING SWITCH

AH SENSOR

POWER TRANSFORMER

CAPACITOR 0.94µF

AC 2300V

RECTIFIER

MAGNETRON

N.O.

MONITOR SWITCH

DESCRIPTION AND FUNCTION OF COMPONENTS

R-320DK R- 320DQ R-320DW

DOOR OPEN MECHANISM

The door is opened by pulling the door. Refer to the Figure D-1.

Door

Latch Heads

Latch Hook

Door Sensing Switch

Monitor Switch Secondary

Interlock Switch

Figure D-1. Door Open Mechanism

DOOR SENSING AND SECONDARY INTERLOCK SWITCHES

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

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.

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), RELAY (RY1), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

TURNTABLE MOTOR

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

COOLING FAN MOTOR

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

MONITOR FUSE

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

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

OVEN THERMAL CUT-OUT

The thermal cut-out, located on the top of the oven cavity, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the thermal cut-out will open. Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 257˚F(125˚C), causing the oven to shut down.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located near the magnetron 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 thermal cut-out remains closed. However, when abnormally high temperatures are reached within the magnetron, the thermal cut-out will open at 293˚F(145˚C) causing the oven to shut down.

R-320DK R-320DQ R-320DW

TROUBLESHOOTING GUIDE

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

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

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

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

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

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

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

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

When the testing is completed

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Reconnect all leads removed from components during testing.

5. Reinstall the outer case (cabinet).

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

7. Run the oven and check all functions.

R-320DK R- 320DQ R-320DW

CK = Check / RE = Replace

CONDITION

OFF CONDITION

COOKING CONDITION

SENSOR COOKING CONDITION

TEST PROCEDURE

AND

POSSIBLE CAUSE

DEFECTIVE PARTS

PROBLEM

Home fuse or circuit breaker blows when power cord is plugged into wall receptacle

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

All letters and indicators do not appear in display when power cord is first plugged into wall outlet.

Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and ":" or time of day should appear in display.)

Oven lamp does not light when door is opened.

Oven lamp does not go out when door is closed.

Oven lamp lights but fan motor and turntable motor do not 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.)

Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food).

Oven does not cook properly when programmed for Cooking Power P50 mode. (Operates properly on Cooking Power P-HI (HIGH) mode.)

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

AH sensor does not end during Sensor cooking condition. (Oven does not shut off after a cup of water is boiling by sensor cooking.)

Oven stops at 16 sec. after starting.

RERE A B C D E F F G H RERECK I CKCK CK J K L M N

SHORT IN POWER CORD

SHORT OR OPENED WIRING

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

THERMAL CUT-OUT

PRIMARY INTERLOCK SYSTEM

SECONDARY INTERLOCK SWITCH

MONITOR SWITCH

MONITOR FUSE

OVEN LAMP OR SOCKET

COOLING FAN MOTOR

TURNTABLE MOTOR

TOUCH CONTROL PANEL

WRONG OPERATION

LOW VOLTAGE

DIRTY OVEN CAVITY

KEY UNIT

RELAY (RY1)

COMPU DEFROST

FOIL PATTERN ON PWB.

AH SENSOR

R-320DK R-320DQ R-320DW

TEST PROCEDURES

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

6. Reconnect all leads removed from components during testing.

7. Reinstall the outer case (cabinet).

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

9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

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

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

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

COMPONENT TEST

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

2. Place the cup of water in the oven. Operate oven at power P-HI (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 34.3 to 63.6˚F(19.1 to 35.4˚C) rise in temperature. If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power output (high rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate for power output, the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits. The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean.

B POWER TRANSFORMER TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 74.2 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.

TEST PROCEDURES

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8. Run the oven and check all functions. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO

MEASURE THE FILAMENT AND HIGH VOLTAGE.)

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 OVEN 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 257˚F(125˚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 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 magnetron reaches approximately 293˚F(145˚C). An open thermal cut-out

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TEST PROCEDURES

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LETTER

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.

6. Reinstall the outer case (cabinet).

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

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

REPLACE THERMAL CUT-OUT.

F SECONDARY INTERLOCK SWITCH TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

PRIMARY INTERLOCK SYSTEM TEST

COMPONENT TEST

DOOR SENSING SWITCH

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

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

fan, turntable and oven light will be activated by RY1.

PRIMARY INTERLOCK RELAY (RY2)

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

G MONITOR SWITCH TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Before performing this test, make sure that the secondary interlock switch and the primary interlock relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter

TEST PROCEDURES

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as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

H BLOWN MONITOR FUSE TEST

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

COMPONENT TEST

Screw Driver

RED

WHT

Monitor Switch

Secondary Interlock Switch

Ohmmeter

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

RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR

SWITCH FOR PROPER OPERATION. If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA021WRK0, even if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).

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

8. Run the oven and check all functions.

I TOUCH CONTROL PANEL ASSEMBLY TEST

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

Before testing,

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

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

insulation tape.

1. Key Unit. NOTE ;

1) Check Key unit ribbon connection before replacement.

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TEST PROCEDURES

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LETTER

COMPONENT TEST

2) Reconnect all leads removed from components during testing.

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

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

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

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

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Replace the Key unit.

5) Reconnect all leads removed from components during testing.

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

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

8) Run the oven and check all functions.

2. Control Unit The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure J) 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.

J 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. I

f 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

12345 67890

START

CLOCK

BEVERAGE

POWER

LEVEL

CHICKEN

PIECES

CHICKEN

BREAST

MINUTE

PLUS

KITCHEN

TIMER

REHEAT SENSOR

CUSTOM

HELP

STEAKS/

CHOPS

BAKED

POTATOES

FISH/

SEAFOOD

POPCORN

RICE

STOP

CLEAR

FROZEN

VEGETABLES

FRESH

VEGETABLES

FROZEN

ENTREES

FRESH

ROLLS &

MUFFINS

FROZEN ROLLS &

MUFFINS

GROUND MEAT

(SENSOR COOK)

GROUND MEAT

(COMPU DEFROST)

G 8

G 9

G10

G11

G12

G13

G14

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

TEST PROCEDURES

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PROCEDURE

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K RELAY TEST

COMPONENT TEST

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.

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

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

7. Remove the outer case and check voltage between Pin No. 1 of the 2 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

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 Approx. 24.0V D.C. Power transformer

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.

L COMPU DEFROST TEST

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 function.

WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the " STEAKS / CHOPS " pad once.

is good, control unit is defective.

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(3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows

WEIGHT

0.5lb 70% 40sec. 40% 30sec.

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

M FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

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

1. Foil pattern check and repairs.

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

4) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

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

5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 212Ω ± 10%). If any abnormal condition is detected, replace the defective parts.

1ST STAGE 2ND STAGE

LEVEL TIME LEVEL TIME

COMPONENT TEST

RY3

RY1

(J1)

VRS1

6) Reconnect all leads removed from components during testing.

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

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

9) Run the oven and check all functions.

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

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

2) Open the door and block it open.

3) Discharge 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. 1 of the 2-pin connector (A) and the Check supply voltage and oven power cord.

common terminal of the relay RY1.

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

side of low voltage transformer. Check and repair.

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

9) Open the door and block it open.

TEST PROCEDURES

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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.

N AH SENSOR TEST

Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure.

(1) The oven should be plugged in at least two minutes before sensor cooking. (2) Room temperature should not exceed 95˚F (35˚C). (3) The unit should not be installed in any area where heat and steam are generated. The unit should

not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS” of the operation manual.

(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To

permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture

with a dry cloth or paper towel.

(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be

at refrigerator temperature and canned soup at room temperature.

(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The

sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

(8) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

Water load cooking test WARNING : The oven should be fully assembled before following procedure.

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. (2) Place the container on the center of tray in the oven cavity. (3) Close the door. (4) Touch REHEAT SENSOR pad once. Now, the oven is in the sensor cooking condition “REHEAT” and

"SENSOR" will appear in the display. (5) The oven will operate for the first 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of

(6) After approximately 16 seconds, microwave energy is produced, and the display should start to count

down the remaining cooking time and oven should turn off after water is boiling (bubbling). If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.

COMPONENT TEST

sensor cooking.

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open. (3) Discharge high voltage capacitor. (4) Remove the AH sensor. (5) Install the new AH sensor. (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) Reconnect the oven to the power supply and check the sensor cook operation as follows:

9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup. 9-2. Place the container on the center of tray in the oven cavity.

R-320DK

Plunger

NC NO

COM

R3 R4

1 2 3

F-1 F-2

F-3

To connector (F) on Control Unit.

CONNECTOR

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COMPONENT TEST

9-3. Close the door. 9-4. Touch REHEAT SENSOR pad once. 9-5. The control panel is in automatic Sensor operation. 9-6. The display will start to count down the remaining cooking time, and the oven will turn off

automatically after the water is boiling (bubbling). If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below.

CHECKING CONTROL UNIT

(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 sensor connector that is mounted to control panel. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel. (6) Disconnect the leads to the primary of the power transformer. (7) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. (8) After that procedure, re-connect the power supply cord. (9) Check the sensor cook operation proceed as follows:

9-1. Touch REHEAT SENSOR pad once. 9-2. The control panel is in the sensor cooking operation. 9-3. After approximately 30 seconds, push plunger of select switch for more than 3 seconds. This

condition is same as judgement by AH sensor.

9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the remaining cooking

time, and the display count down. If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.

(10) Disconnect the power supply cord, and then remove outer case. (11) Open the door and block it open. (12) Discharge high voltage capacitor. (13) Disconnect the dummy resistor circuit from the sensor connector of control panel. (14) Carry out necessary repair. (15) Reconnect all leads removed from components during testing and repairing. (16) Re-install the outer case (cabinet). (17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions. (18) Carry out "Water load cooking test" again and ensure that the oven works properly.

R1, R2 : 22Ω ± 1% 1/2W

R3 : 4.3kΩ ± 5% 1/4W R4 : 1MΩ ± 5% 1/4W

Sensor Dummy Resistor Circuit

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

R-320DK R- 320DQ R-320DW

The touch control section consists of the following units. (1)Key Unit

(2)Control Unit (The Control Unit consists of Power Unit

and LSI 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 P110-P117. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P100, P101, P102, P103, ANI6 and ANI7 to perform the function that was requested.

Control Unit

Control unit consists of LSI, ACL circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and back light circuit.

1) ACL

This circuit generates a signal which resets the LSI to the initial state when power is supplied.

4) Relay Circuit

A circuit to drive the magnetron, fan motor, turntable motor and light the oven lamp.

5) Buzzer Circuit

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

6) Synchronizing Signal Circuit

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

7) Door Sensing Switch

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

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD1- LD4).

9) Absolute Humidity Sensor Circuit

This circuit detects moisture of the cooking food to allow its automatic cooking.

2) Indicator Circuit

This circuit consists of 36 segments and 3 common electrodes using a Liquid Crystal Display.

3) Power Source Circuit

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

Symbol Voltage Application

VC -5V LSI(IC1)

R-320DK

16.7 msec.

H : GND

L : -5V

16.7 msec.

During cooking

H : GND

L : -5V

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LSI(IXA020DR)

The I/O signal of the LSI(IXA020DR) is detailed in the following table.

Pin No. Signal I/O Description

1-2 P26-P27 OUT Terminal not used. 3-5 P70-P72 OUT Terminal not used.

6 IC IN Connected to VC. 7 X2 OUT Internal clock oscillation output.

Output to control oscillation input to X2.

8X1INInternal clock oscillation frequency control input setting.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to X1.

9 VDD1 IN Power source voltage: GND(0V).

The power source voltage to drive LSI is input to VDD1 terminal. 10 XT1 IN Connected to GND. 11 XT2 OUT Terminal not used. 12 RESET IN Auto clear terminal.

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

"L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"

level. 13 INTP0 IN Connected to VC. 14 INTP1 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

15 P02 OUT Terminal not used. 16 P03 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay (RY2). The

signals holds "L" level during microwave cooking

and "H" level while not cooking. In other cooking

modes (variable cooking) the signal turns to "H"

level and "L" level in repetition according to the

power level.

(ON and OFF times for other power level.)

17 P04 OUT Oven lamp, fan motor and turntable motor driving signal

To turn on and off shut off relay (RY1). The

square waveform voltage is delivered to the RY1

driving circuit and RY2 control circuit.

18 P05 OUT Terminal not used. 19 P110 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102

and P103 terminal while one of G8 line keys on key matrix is touched. 20 P111 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102

and P103 terminal while one of G7 line keys on key matrix is touched. 21 P112 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102

and P103 terminal while one of G6 line keys on key matrix is touched. 22 P113 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102

and P103 terminal while one of G5 line keys on key matrix is touched.

OFF

P-HI

OFF OFF

P-70

24 sec.

8 sec.

H : GND

L : -5V H : GND

L : -5V

Pin No. Signal I/O Description

23 P114 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G4 line keys on key matrix is touched.

24 P115 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G3 line keys on key matrix is touched.

25 P116 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G2 line keys on key matrix is touched.

26 P117 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to ANI6, ANI7, P100, P101,

P102 and P103 terminal while one of G1 line keys on key matrix is touched. 27 AVSS IN Connected to VC. 28 ANI0 OUT Terminal not used.

29-31 ANI1-ANI3 IN Terminal to change cooking input according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with the Model

in operation is applied to set up its cooking constant. 32 ANI4 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an

analog input terminal from the AH sensor circuit, and connected to the A/D converter built

into the LSI. 33 ANI5 IN AH sensor input.

This input is an analog input terminal from the AH sensor circuit, and connected to the

A/D converter built into the LSI. 34 ANI6 IN Input terminal to judge the model.

The signal out of P117 will be input into ANI6 through G1 line on key matrix. The LSI will

judge the model by this signal. 35 ANI7 IN Signal coming from touch key.

When either G13 line on key matrix is touched, a corresponding signal out of P110 - P117

will be input into ANI7. When no key is touched, the signal is held at "H" level. 36 VDD0 IN Power source voltage : GND(0V).

The power source voltage to drive LSI is input to VDD0 terminal. 37 AVREF IN A/D converter power source voltage : GND(0V).

The power source voltage to drive the A/D converter. Connected to GND. 38 P100 IN Signal similar to ANI7.

When either G12 line on key matrix is touched, a corresponding signal will be input into

P100. 39 P101 IN Signal similar to ANI7.

When either G11 line on key matrix is touched, a corresponding signal will be input into

P101. 40 VSS1 IN Power source voltage : -5.0V.

The power source voltage to the drive LSI is input to VSS1 terminal. Connected to VC. 41 P102 IN Signal similar to ANI7.

When either G10 line on key matrix is touched, a corresponding signal will be input into

P102. 42 P103 IN Signal similar to ANI7.

When either G9 line on key matrix is touched, a corresponding signal will be input into

P103. 43 P30 OUT Terminal not used.

44-48 P31-P35 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

R-320DK R- 320DQ R-320DW

R-320DK R-320DQ R-320DW

Pin No. Signal I/O Description

49 P36 OUT Signal to sound buzzer (2.0 kHz).

A: key touch sound. B: Completion sound.

0.1 sec.

2.0 sec.

50 P37 IN To input signal which communicates the door open/close information to LSI.

Door close "H" level signal (0V). Door open "L" level signal (-5V).

51 COM0 OUT Common data signal: COM2.

Connected to LCD signal COM2.

52 COM1 OUT Common data signal: COM1.

Connected to LCD signal COM1.

53 COM2 OUT Common data signal: COM0.

Connected to LCD signal COM0. 54 COM3 OUT Terminal not used. 55 BIAS IN Power source voltage : GND(0V). 56 VLC0 IN Power source voltage input terminal.

Standard voltage for LCD. Connected to GND.

57-58 VLC1-VLC2 IN Power source voltage input terminal.

Standard voltage for LCD. 59 VSS0 IN Power source voltage: -5.0V.

The power source voltage to the LSI is input to VSS0 terminal. Connected toVC.

60-95 S0-S35 OUT Segment data signal.

Connected to LCD.

The relation between signals are as follows:

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

S0 (60) ......................................SEG 0 S18 (78) ....................................SEG 18

S1 (61) ......................................SEG 1 S19 (79) ....................................SEG 19

S2 (62) ......................................SEG 2 S20 (80) ....................................SEG 20

S3 (63) ......................................SEG 3 S21 (81) ....................................SEG 21

S4 (64) ......................................SEG 4 S22 (82) ....................................SEG 22

S5 (65) ......................................SEG 5 S23 (83) ....................................SEG 23

S6 (66) ......................................SEG 6 S24 (84) ....................................SEG 24

S7 (67) ......................................SEG 7 S25 (85) ....................................SEG 25

S8 (68) ......................................SEG 8 S26 (86) ....................................SEG 26

S9 (69) ......................................SEG 9 S27 (87) ....................................SEG 27

S10 (70) .....................................SEG 10 S28 (88) ....................................SEG 28

S11 (71) .....................................SEG 11 S29 (89) ....................................SEG 29

S12 (72) .....................................SEG 12 S30 (90) ....................................SEG 30

S13 (73) .....................................SEG 13 S31 (91) ....................................SEG 31

S14 (74) .....................................SEG 14 S32 (92) ....................................SEG 32

S15 (75) .....................................SEG 15 S33 (93) ....................................SEG 33

S16 (76) .....................................SEG 16 S34 (94) ....................................SEG 34

S17 (77) .....................................SEG 17 S35 (95) ....................................SEG 35

96-99 P83-P80 OUT Terminal not used.

100 P25 OUT Terminal not used.

H : GND

L : -5V H : GND

L : -5V

ABSOLUTE HUMIDITY SENSOR CIRCUIT

R-320DK R- 320DQ R-320DW

(1)Structure of Absolute Humidity Sensor

The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.

Thermistors

ventilation opening for sensing

Sensing part (Open vessel)

Sensing part (Closed vessel)

(2)Operational Principle of Absolute Humidity Sensor

The figure below shows the basic structure of an absolute humidity sensor. A bridge circuit is formed by two thermistors and two resistors (R1 and R2). The output of the bridge circuit is to be amplified by the operational amplifier. Each thermistor is supplied with a current to keep it heated at about 150˚C (302˚F), the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity conditions they show different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit, the intensity of which is increased as the absolute humidity of the air increases. Since the output is very minute, it is amplified by the operational amplifier.

Absolute humidity vs,

Operational amplifier

Output voltage

output voltage characteristic

food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at ANI5 terminal of the LSI. Then the LSI observes that voltage at ANI5 terminal and compares it with its initial value, and when the comparison rate reaches the preset value (fixed for each menu to be cooked), the LSI causes the unit to stop sensor cooking; thereafter, the unit goes in the next operation automatically. When the LSI starts to detect the initial voltage at ANI5 terminal 16 seconds after the unit has been put in the Sensor Cooking mode, if it is not possible to balance the bridge circuit due to disconnection of the absolute humidity sensor, ERROR will appear on the display and the cooking is stopped.

1) Absolute humidity sensor circuit

SW1

P31

SW2

P32

SW3

P33

SW4

P34

SW5

P35

ANI4

LSI (IC1)

ANI5

C. Thermistor in closed vessel S. Thermistor in open vessel

F-1 C

F-3

3.57k

F-2

VA : -15V

R96

R91

3.32k

R90

C90

R92

1.8k

R98 R99 R100 R101 R102

0.1

R97 47k

620k 300k 150k

75k

37.4k

C93

5678 1234

IC2

VA : -15V

R93

360k

0.01uF

C91

0.015uF

R94

10k

VC : -5V

R95 47k

0.01uF

C92

D90

S : Thermistor open vessel

C : Thermistor closed vessel

Output voltage

Absolute humidity (g/m )

(3)Detector Circuit of Absolute Humidity Sensor Circuit

This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit. When the unit is set in the sensor cooking mode, 16 seconds clearing cycle occurs than the detector circuit starts to function and the LSI observes the initial voltage available at its ANI5 terminal. With this voltage given, the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R98 ~ R102. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and ANI4 terminal of the LSI. The voltage of ANI5 terminal will indicate about -2.5V. This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode. As the sensor cooking proceeds, the

R-320DK R-320DQ R-320DW

TOUCH CONTROL PANEL SERVICING

1. Precautions for Handling Electronic Components

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

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

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

approx. 1M ohm

2. Servicing of Touch Control Panel

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

(1)Servicing the touch control panel with power supply

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

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

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

2) Open the door and block it open.

3) Discharge high voltage capacitor.

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

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

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

After checking the performance of the touch control panel,

1) Disconnect the power supply cord.

2) Open the door and block it open.

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

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

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

6) Run the oven and check all functions.

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

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

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

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

(2)Servicing the touch control panel with power supply

from an external power source:

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

3. 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

4. Other Precautions

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

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

3) After aluminium foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5) Be sure to use specified components where high precision is required.

R-320DK

)

R- 320DQ R-320DW

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 following 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

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.

and Oven cavity.

3) Sharp edge:

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

4) Movable parts (to prevent a fault)

Fan blade, Fan motor, Switch.

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

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

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

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

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

1. Disconnect the power supply cord.

2. Open the oven door and block it open.

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

4. Remove the remaining two (2) screws from rear and one (1) screw along the right side of outer case.

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

6. Lift entire outer case from the unit.

Special screw

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

R-320DK R-320DQ R-320DW

CAUTION: 1. DISCONNECT OVEN FROM POWER SUP

PLY BEFORE REMOVING OUTER CASE.

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

POWER TRANSFORMER REMOVAL

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

2. Open the oven door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads (primary and high voltage) from power transformer and the filament leads from the magnetron and capacitor terminals.

5. Remove four (4) screws holding transformer to bottom plate.

6. Remove transformer from bottom plate.

TERMINAL INSULATOR REPLACEMENT

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

5. Remove the receptacle from the terminal insulator.

6. Now, the terminal insulator is free.

NOTE: When replacing the outer case, the 2 special

Torx screws must be reinstalled in the same locations.

Re-instal

1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.

Secure transformer with four screws to bottom plate.

3. Re-connect wire leads (primary and high voltage) to power transformer and filament leads of transformer to magnetron and high voltage capacitor. Refer to "PICTORIAL DIAGRAM" on page 32

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

Installation

1. Insert the receptacle into terminal insulator.

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

3. Reconnect all leads removed from components during testing.

4. Reinstall the outer case (cabinet).

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

6. Run the oven and check all functions.

Covers

Terminal insulator

Flat type screw driver

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the high voltage wire B from the power transformer.

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

6. Disconnect the filament lead (short one) of the power transformer from the high voltage capacitor.

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

MAGNETRON REMOVAL

Removal

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect all wire leads from magnetron.

5. Disconnect the wire leads from thermal cut-out (MG).

6. Remove the four (4) screws holding chassis support to magnetron, oven cavity back plate, oven cavity front

Receptacle

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

9. Disconnect rectifier terminal from capacitor. High voltage rectifier assembly is now free.

10.Disconnect the high voltage wire B from the high voltage capacitor.

11.Remove capacitor holder. Capacitor is now free.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-

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

flange and fan duct.

7. Remove the chassis support from oven.

8. Carefully remove the four (4) screws holding magnetron to waveguide flange.

9. Lift up magnetron with care so that magnetron antenna is not hit by any metal object around antenna.

10.Remove the two (2) screws holding the magnetron duct to magnetron.

11.Remove the magnetron duct with thermal cut-out (MG)

R-320DK

Terminal

Push

Pull down

Lever

Positive lock® connector

R- 320DQ R-320DW

from magnetron.

12.Now, the magnetron is free.

Re-install

1. Re-install the magnetron duct with thermal cut-out (MG) to magnetron with the two (2) screws.

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

3. Insert the two (2) tabs of the chassis support to the oven cavity front plate and the back plate.

4. Hold the chassis support to the oven cavity back plate,

OVEN LAMP AND LAMP SOCKET REMOVAL

Disconnect the power supply cord and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Remove the oven lamp from the oven lamp socket.

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

6. Bend the tab of the partition angle holding the lamp socket.

7. Lift up the oven lamp socket.

8. Now, the oven lamp socket is free.

oven cavity front flang, magnetron and the fan duct with the four (4) screws.

5. Reconnect the wire leads to the magnetron and thermal cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page

32.

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

CAUTION: WHEN REPLACING MAGNETRON, BE SURE

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

Oven lamp socket

Terminal

Wire lead

Terminal hole

Flat type small screw driver

Figure C-1. Oven lamp socket

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Push the lever of positive lock® connector.

5. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

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

CONTROL PANEL ASSEMBLY REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from the door sensing switch and the oven cavity front flange.

5. Disconnect the wire leads from panel components.

6. Make one (1) tab of the oven cavity front plate straight holding the control panel assembly to the oven flange.

7. Slide the control panel assembly upward and remove it.

8. Now, individual components can be removed.

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

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

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

Figure C-2. Positive lock® connector

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

CPU UNIT NOTE: Handle the CPU unit carefully so that the ribbon

cable does not come off. Because the ribbon cable is glued on the LCD and the printed wiring board only by heated paste.

Ribbon cable

Liquid Crystal

Display (LCD)

of CPU unit

Printed wiring board

CPU unit

R-320DK R-320DQ R-320DW

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove turntable and turntable support from oven cavity.

3. Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four corners.

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

COOLING FAN MOTOR REMOVAL

REMOVAL

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect the wire leads from the fan motor.

5. Remove the magnetron and chassis support from the waveguide flange, referring to "MAGNETRON REMOVAL".

Release the snap of the main wire harness from the fan duct.

7. Remove one (1) screw holding the fan duct assembly to oven cavity.

Release the main wire harness from the hole of the fan duct.

9. Release the fan duct from the waveguide flange.

10.Release the fan duct assembly from the oven cavity.

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

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

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

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

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

because the coil may be cut or injured.

* Do not disfigure the bracket by touching with the

pliers.

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

14. 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.

Coil

Groove joint pliers

5. Disconnect wire leads from turntable motor. (See "Positive lock connector removal")

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

7. Now the turntable motor is free.

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

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

16.Now, the fan motor is free.

INSTALLATION

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

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

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

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

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

CAUTION: * Do not hit the fan blade strongly when installed

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.

6. Catch three holes of fan duct on three tabs of the waveguide flange.

7. Install the fan duct assembly to the oven cavity with the one (1) screw.

8. Insert the snap of the main wire harness to the hole of the fan duct and insert the main wire harness into the hole of the fan duct.

9. Install the magnetron and the chassis support to the oven cavity, referring to "Re-install of MAGNETRON REMOVAL".

10.Connect the wire leads to the fan motor, referring to the pictorial diagram.

Shaft

Stator

Gap Bracket

Rotor

Shaft

Axis

Stator

Rotor

These are the positions that should be pinched with pliers

Table

Center of bracket

Side ViewRear View

R-320DK R- 320DQ R-320DW

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL

Disconnect the power supply cord and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from the switches.

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

6. Remove latch hook assembly from oven flange.

7. Push outward on the two (2) retaining tabs holding switch in place.

8. Switch is now free.

Re-install

1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in the upper position.

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

3. Secure latch hook (with two (2) mounting screws) to oven 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.

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

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

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

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

6. Secure the screws with washers firmly.

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

After adjustment, check the following.

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

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

2. The contacts of door sensing switch and secondary interlock switch open within 0.9mm gap between right side of cavity face plate and door when door is open.

3. Monitor switch contacts close when door is opened.

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

Door

Latch Heads

Latch Hook

Door Sensing Switch

Monitor Switch Secondary

Interlock Switch

Figure C-3. Latch Switch Adjustments

DOOR REPLACEMENT

REMOVAL

1. Disconnect the power supply cord.

2. Open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-4 to free engaging parts.

4. Pry the choke cover by inserting a putty knife as shown Figure C-4.

5. Release choke cover from door panel.

6. Now choke cover is free.

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

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

Door Frame

Putty Knife

Choke Cover

Figure C-4. Door Disassembly

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

10.Release door panel from eight (8) tabs of door frame.

R-320DK R-320DQ R-320DW

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

12.Tear sealer film from door panel.

13.Now, door panel is free.

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

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

16.Remove door screen from door frame.

17.Now, door screen is free.

RE-INSTALL

1. Re-install door screen to door frame.

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

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

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

5. Put sealer film on door panel. Refer to “Sealer Film” about how to handle new one.

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

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

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

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

(B) An approved microwave survey meter should be

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

After any service, make sure of the following :

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

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

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

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

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

an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be airtight, 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.

Upper Oven Hinge

Lower Oven

Upper Oven Hinge

Lower Oven Hinge

Hinge

Choke Cover

Figure C-5. Door Replacement

SEALER FILM

Installation

1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-6.

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

3. Put the pasted side of the sealer film on the door panel

Sealer film

Backing film

Adhesive tape

Figure C-6. Sealer film

R-320DK R- 320DQ R-320DW

POWER SUPPLY

CORD 120V 60Hz

HIGH VOLTAGE

CAPACITOR

RECTIFIER H.V.

NOTE:

The grounding conductor of

the power supply cord has

been grounded by power

BLUE MARK

YLW

BLK

WHT

supply cord fixing screw.

The screw must allways be

kept tight.

Hot (YLW) wire must be

connected to the terminal

with blue mark on the

oven light socket.

NOTE:

WHT

OVEN LAMP

AND SOCKET

WHT

BLK

NOTE:

The neutral (WHT) wire must be

connected to the neutral (WHT)

wire of the power supply cord.

THERMAL

CUT-OUT (MG)

BLK

THERMAL

CUT-OUT (OVEN)

BLK

GRY

WHT

FAN MOTOR

HIGH VOLTAGE

WIRE B

MAGNETRON

HIGH VOLTAGE COMPONENTS

GRY

BLK

FUSE

BLK

MONITOR

HOLDER

BLK

POWER

TRANSFORMER

RED

WHT

TURNTABLE

MOTOR

WHT

RED

GRN

N.O.

COM.

DOOR

SENSING

AH SENSOR

BLK

RED

WHT

CN-F

123

SWITCH

CONTROL UNIT

GRN

(To oven cavity front flange.)

CN-F

CN-C

IC1

CN-G

(CPU UNIT)

RED

GRN

SH-A

SH-B

CN-C

WHT 1

SP1

CN-A

WHT

COM.

N.C.

MONITOR

RY2

BLK

SWITCH

YLW

CN-A

RED

PRIMARY

INTERLOCK

RELAY

YLW

RY1

GRY

SECONDARY

(POWER UNIT)

WHT

COM.

INTERLOCK

SWITCH

Figure S-1. Pictorial Diagram

R-320DK R-320DQ R-320DW

C10

C 2 C 3

C 9

GND NC

GND

D20

S1NB10

+ –

C2 1000µ/35v

CN-A

A 1 A 2

VRS1

10G471K

(J1)

C 4

C 1

INT

OVEN LAMP FAN MOTOR TURNTABLE MOTOR

(CN-D)

MICRO

COM

D 1

D 3

COM

RY1

RY2

B 2 SH-A SH-B B 1

(CN-B)

DOOR SENSING SWITCH

SP1

C 5

BUZZER

C 6

C 8

C 7

C11

C12

OVEN LAMP FAN MOTOR TURNTABLE MOTOR

MICRO

NC DOOR

SENSING SWITCH

CN-C

12PIN LEAD WIRE HARNESS

Figure S-2. Power Unit Circuit

R-320DK R- 320DQ R-320DW

15k R60

PLUS

MINUTE

FROZEN

ROLLS &

STOP

CLEAR

BREAST

CHICKEN

BEVERAGE

TIMER

LEVEL

POWER

KITCHEN

FRESH

ROLLS &

FRESH

VEGETABLES

RICE START CLOCK

FISH/

SEAFOOD

FROZEN

GROUND MEAT

(SENSOR COOK)

VEGETABLES

MUFFINS

15k R61

15k R62

15k R63

15k R64

15k R65

15k R66

15k R67

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

C60 330p/50v

12345

PIECES

STEAKS/

CHICKEN

BAKED

G 9

67890

CHOPS

POPCORN

POTATOES

G10G11G12

10K R13

10K R14

10K R15

SEG0

EDCBA

P37S21

P36

P35

P34

P33

P32

P31

P30

P103

P102

P101

P100

S24

S25

S26

IC1

S27

S28

S29

S30

VSS1

IXA020DR

S31

S32

S33

5180

COM0 COM1 COM2 COM3

BIAS

VLC0 VLC1 VLC2 VSS0

S 0 S 1 S 2 S 3 S 4 S 5 S 6 S 7 S 8 S 9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20

S22

S23

SEG21

VDD0

AVREF

S34

S35

SEG35

ANI7

ANI6

ANI5

ANI4

ANI3

ANI2 ANI1 ANI0

AVSS P117 P116 P115 P114 P113 P112 P111 P110

P05 P04 P03 P02

INTP1 INTP0

RESET

XT2 XT1

VDD1

X 1 X 2 I C

P72 P71 P70 P27 P26

130

P83

P82

P81

P80

P25

1M R80

100

COM2 COM1 COM0 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6

COOK SENSOR LBS KG DEF HELP

SEG7 SEG8 SEG9

SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35

LIQUID CRYSTAL DISPLAY

CF1 CST4.00MGW

GND

GROUND MEAT

(COMPU DEFROST)

HELP

CUSTOM

FROZEN

ENTREES

REHEAT

SENSOR

KEY UNIT

G13

G14

C61 330p/50v

4.7K (J15)

(J14)

(J12)

4.7K (J13)

4.7K

(J10) (J11)

/25v

0.01µ C14

R11 15k

Q10

2SA

R10 1k

1037AK

UDZ4.3B ZD10

CPU UNIT

/25v

0.01µ C13

Q11

DTA143EKA

R12 15k

/50v

0.1µ

C12

C11 0.1µ/50v

C10 47µ/16v

–

C4 10µ/35v

R3 510

1/2w

–

C3 0.1µ/50v

UDZ16B ZD1

1/4w R1 2.4k

R2 680 1/2w

Q1 2SB1238

C1 0.1µ/50v

C93 0.01µ/25v

/25v

0.01µ C92

R94 10k R95 47k

1234

IC2 BA4558

/50v

0.1µ

D90

MA152WA

C90

R96 3.57KDR91 3.32KD

R5 4.7k

LD4LD3LD2LD1

D5 D6

1SS355 x 2

0.015µ/25v C91

R93 360kF

R92 1.8kF

R90

330 1w

Q2 2SB1238

27 1/4w

R97 47k

1/4w

3.3k R6

R98 620k R99 300k R100 150kF R102 37.4kF

DECBA

R101 75kF

C20

Q30 DTA143EKA

KRC243S

Q20 DTA143EKA

0.1µ

/35v 10µ C5

/50v

–

1SS355 x 2

C40 0.01µ/25v

R40 4.7k

Q21 DTA123JKA

(Q22 DTA123JKA)

x 2 1SS355 (D9-D10)

(D10)

D20 1SS355

(D9)

R41 15k

CN-F AH SENSOR

F-1 F-2 F-3

D41 1SS355

C-4

C-2

C-9

C-3

C-10

C-1

C-5

C-6

C-7

C-8

C-12

C-11

NOTE

C62 330p/50v C63 330p/50v C64 330p/50v C65 330p/50v

R74 270k R75 270k R76 270k R77 270k R78 270k

R79 270k

P103 P102 P101 P100 ANI7 ANI6

: IF NOT SPECIFIED 1/10W ± 5%

R68 15k

R69 15k

R70 15k

R71 15k

R72 15k

R73 15k

Figure S-3. CPU Unit Circuit

INT

GND

TOP

HEATER

DOOR

SENSING

BUZZER

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

MICRO

SWITCH

R-320DK R-320DQ R-320DW

(RED) (GREEN)

SH - B SH - A

(CN - B)

(D20)

DIP

CN - C

ZD1

SP1

(J2)

(D10)

D9 D7

RY2

RY3(CN - D)

RY1

(J1)

VRS1

CN - A

Figure S-5. Printed Wiring Board of Power Unit

PARTS LIST

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

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

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

ELECTRIC PARTS

1- 1 QSW-MA147WRZZ 2nd interlock switch / door sensing switch 2 AG 1- 2 QFSHDA009WRE0 Fuse holder 1 AH 1- 3 FFS-BA021WRK0 1- 4 RTHM-A078WRE0 Thermal cut-out 125 deg. 1 AL 1- 5 FACCDA085WREZ Power supply cord 1 AQ 1- 5 FACCDA083WRE0 Power supply cord (Interchangeable) 1 AQ 1- 6 FH-DZA094WRKZ High voltage rectifier assembly 1 AU 1- 7 RC-QZA234WRE0 High voltage capacitor 1 AV

1- 8 RV-MZA288WRE0 Magnetron 1 BK

1- 9 RMOTEA383WRE0 Fan motor 1 AV

∆

1- 9 RMOTEA355WRE0 Fan motor (Interchangeable) 1 AU 1-10 QSOCLA021WRE0 Oven lamp socket 1 AH 1-11 RLMPTA068WRE0 Oven lamp 1 AG 1-11 RLMPTA030WRE0 Oven lamp (Interchangeable) 1 AE 1-12 RMOTDA229WRE0 Turntable motor 1 AQ 1-12 RMOTDA211WRE0 Turntable motor (Interchangeable) 1 AS 1-13 RTHM-A080WRE0 Thermal cut-out 145 deg. 1 AP 1-14 RTRN-A603WRZZ Power transformer 1 BM

1-15 FDTCTA197WRK0 AH sensor assebly 1 BC

2- 1 GCABUA744WRPZ Outer case cabinet [R-320DK] 1 BC 2- 1 GCABUA690WRP0 Outer case cabinet [R-320DW] 1 AZ 2- 1 GCABUA758WRPZ Outer case cabinet [R-320DQ] 1 BF 2- 2 GDAI-A316WRW0 Bottom plate 1 AX 2- 3 GLEGPA074WRE0 Foot 2 AC 2- 4 GLEGPA077WRF0 Leg 1 AH

3- 1 DPWBFC024WRKZ Power unit 1 BA 3- 1A QCNCMA446DRE0 2-pin connector (CN-A) 1 AC 3- 1B FW-VZA232DRE0 12pin lead wire (CN-C) 1 AE 3- 1C FW-VZA195DRE0 Switch harness A (SH-A) 1 AD 3- 1D FW-VZA256DREZ Switch harness B (SH-B) 1 AF C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AF D20 RSRCDA013DRE0 Diode bridge (S1NB10) 1 AG RY1 RRLY-A076DRE0 Relay (OMIF-S-124LM) 1 AK RY2 RRLY-A113DRE0 Relay (DU24D1-1PR(M)) 1 AM SP1 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG T1 RTRNPA111DRE0 Transformer 1 AP VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE 3- 2 DPWBFC023WRKZ CPU unit 1 BE 3- 3 FPNLCB484WRKZ Control panel frame with key unit [R-320DK] 1 BC 3- 3 FPNLCB486WRKZ Control panel frame with key unit [R-320DW] 1 BD 3- 3 FPNLCB487WRKZ Control panel frame with key unit [R-320DQ] 1 BD 3- 3-1 FUNTKA980WREZ Key unit [R-320DK] 1 AW 3- 3-1 FUNTKA981WREZ Key unit [R-320DW] 1 AY 3- 3-1 FUNTKA982WREZ Key unit [R-320DQ] 1 AY 3- 4 PSHEPA588WRE0 LED sheet 1 AE 3- 5 LHLD-A219WRFZ LCD holder 1 AD 3- 6 XEPSD30P08XS0 Screw; 3mm x 8mm 4 AA

4- 1 PDUC-A724WRF0 Air separater 1 AU 4- 2 PPACGA084WRF0 TTM packing 1 AF 4- 3 PHOK-A116WRFZ Latch hook 1 AH

∆

4- 4 LBNDKA099WRW0 Capacitor holder 1 AD 4- 5 NFANJA029WRE0 Fan blade 1 AL 4- 6 PDUC-A728WRW0 Fan duct 1 AT 4- 7 ************* Oven cavity (Not a replaceable part) 1--

∆

4- 8 LANGFA196WRWZ Chassis support 1 AX 4- 9 LANG-A067WRPZ Magnetron duct 1 AG 4-10 LANG-A063WRPZ Air guide 1 AH 4-11 LANG-A064WRPZ Barrier 1 AK 4-12 NCPL-A053WRFZ Coupling 1 AE 4-13 PCUSUA511WRP0 Cushion 1 AC 4-14 PCOVPA349WRE0 Waveguide cover 1 AE

Monitor fuse 20A and monitor switch (V-16G-2C25) assembly

CABINET PARTS

CONTROL PANEL PARTS

OVEN PARTS

1AL

R- 320DK R-320DQ R-320DW

R-320DK R-320DQ R-320DW

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

4-15 PCUSGA339WRP0 Cushion 2 AG 4-16 PCUSGA533WRP0 Cushion 1 AD 4-17 PCUSUA512WRP0 Cushion 1 AB 4-18 PCUSGA529WRP0 Cushion 1 AC 4-19 PCUSUA527WRP0 Cushion 1 AE 4-20 PCUSUA157WRP0 Cushion 2 AC 4-21 PCUSUA212WRP0 Cushion 1 AB 4-22 PCUSUA474WRP0 Cushion 2 AC 4-23 PCUSUA376WRP0 Cushion 2 AF 4-24 LANG-A065WRWZ Sensor guide 1 AH 4-25 LANGTA365WRPZ Sensor mounting angle 1 AH

DOOR PARTS

5- 1 FDORFA332WRT0 Door panel 1 BD

∆

5- 2 PSHEPA382WRE0 Sealer film 1 AH 5- 3 GWAKPA694WRRZ Door frame [R-320DK] 1 AX

∆

5- 3 GWAKPA701WRRZ Door frame [R-320DW] 1 AV

∆

5- 3 GWAKPA710WRRZ Door frame [R-320DQ] 1 AT

∆

5- 4 HPNL-A731WRRZ Door screen [R-320DK] 1 AS 5- 4 HPNL-A734WRR0 Door screen [R-320DW] 1 AS 5- 4 HPNL-A739WRR0 Door screen [R-320DQ] 1 AS 5- 5 LSTPPA193WRFZ Latch head 1 AE

∆

5- 6 MSPRTA187WRE0 Latch spring 1 AC 5- 7 XCPSD40P08000 Screw : 4mm x 8mm 4 AA 5- 8 PCUSUA461WRP0 Cushion 1 AB 5- 9 GCOVHA417WRFZ Choke cover 1 AG

MISCELLANEOUS

6- 1 FROLPA079WRK0 Turntable support 1 AQ 6- 2 NTNT-A079WRE0 Turntable tray 1 AR 6- 3 FW-VZB771WREZ Main wire harness 1 AU 6- 4 QW-QZA150WRE0 High voltage wire B 1 AF

6- 5 PZET-A012WRE0 Terminal insulator 1 AB 6- 6 TCAUAA166WRR0 DHHS caution label 1 AC 6- 7 TCAUAA254WRR0 Monitor caution label 1 6- 8 TINSEA832WRRZ Instruction book 1 AP 6- 9 TCAUAA255WRR0 Screw caution 1

SCREWS,NUTS AND WASHERS

7- 1 XHPSD40P08K00 Screw : 4mm x 8mm 9 AA 7- 2 XHPSD30P06000 Screw : 3mm x 6mm 3 AA 7- 3 XHTSD40P08RV0 Screw : 4mm x 8mm 5 AA 7- 4 XHTSD40P12RV0 Screw : 4mm x 12mm 1 AA 7- 5 XOTSD40P12RV0 Screw : 4mm x 12mm 3 AA 7- 6 XOTSD40P12000 Screw : 4mm x 12mm 17 AA 7- 7 XOTSF40P08000 Screw : 4mm x 8mm [R-310DK] 1 AA 7- 7 XOTSE40P08000 Screw : 4mm x 8mm [R-310DW] 1 AA 7- 7 XOTSE40P08000 Screw : 4mm x 8mm [R-308DW] 1 AA 7- 8 LX-CZA070WRE0 Special screw (Torx tamper proof screw) 2 AC 7- 9 LX-CZ0052WRE0 Special screw 2 AA

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- 320DK

7-5

7-8

7-5

7-8

1-10

6-7

2-1

4-13

4-17

1-11

1-15

4-14

4-2

1-12

7-1

7-5

1-7

4-21

1-8

7-3

1-13

7-6

4-24

4-11

4-19

7-2

4-9

1-6

1-1

7-1

2-3

7-6

1-9

4-6

7-6

4-15

4-16

4-18

7-3

4-8

7-4

4-4

4-15

4-22

7-6

1-4

4-7

7-7

7-6

7-2

4-23

4-20

7-1

7-6

4-10

6-9

4-20

4-12

6-2

6-1

4-1

7-6

1-3

1-2

1-1

4-3

2-4

4-5

2-2

7-3

7-1

1-14

1-5

6-6

7-9

4-22

4-25

4-23

7-3

R-320DQ R-320DW

OVEN AND CABINET PARTS

R-320DK R-320DQ R-320DW

CONTROL PANEL PARTS

3-2

3-5

3-4

3-6

3-3

3-1

3-6

3-3-1

5-9

5-7

DOOR PARTS

5-4

5-3

5-1

5-2

5-7

5-6

5-8

5-7

5-5

MISCELLANEOUS

6-3

6-4

Actual wire harness may be different from illustration.

(CAPACITOR)

6-5

R- 320DK R-320DQ R-320DW

PACKING AND ACCESSORIES

TOP PAD ASSEMBLY FPADBA416WRKZ

DOOR PROTECTION SHEET

INTO THE

OVEN CAVITY

SPADPA204WRE0

6- 8 INSTRUCTION BOOK & PRINTING MATTER

6- 2 TURNTABLE TRAY

6- 1 TURNTABLE SUPPORT

TRAY PACK SPADFA451WRE0

PLASTIC BAG SSAKHA034WRE0

BOTTOM PAD ASSEMBLY FPADBA417WRKZ

Not replaceable items.

PACKING CASE SPAKCD351WREZ [R-320DK]

SPAKCD357WREZ

[R-320DW]

SPAKCD358WREZ [R-320DQ]

R-320DK R-320DQ R-320DW

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.

20' SHARP CORP. (1S2.530E) Printed in U.S.A

SHARP R320D, R-320DK, R-320DQ Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual