SHARP R-201FK, R-203FW, R-205FW, R-206FW Service Manual

SERVICE MANUAL
S1201R201FPW/
MICROWAVE OVEN
R-201FK/W R-203FW R-205FW R-206FW
MODELS
R-201FK/W R-203FW R-205FW R-206FW
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
R-206FW

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 ..............................................................................................................................9
TEST PROCEDURE............................................................................................................................................10
TOUCH CONTROL PANEL.................................................................................................................................18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE................................................................22
PICTORIAL DIAGRAM ........................................................................................................................................28
CONTROL PANEL CIRCUIT ............................................................................................................................... 29
PRINTED WIRING BOARD ................................................................................................................................. 30
PARTS LIST ........................................................................................................................................................30
PACKING AND ACCESSORIES .........................................................................................................................34
tain 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.
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R-201FK/W R-203FW R-205FW R-206FW
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.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.

BEFORE SERVICING

Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.
36

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-201FK/W R-203FW R-205FW R-206FW
Before Servicing
1. Disconnect the power supply cord , and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short-circuit the connection of the high­voltage capacitor (that is the connecting lead of the high­voltage rectifier) against the chassis with the use of an insulated screwdriver.
Whenever troubleshooting is performed the power supply must be disconnected. It may, in some cases, be necessary to connect the power supply after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power to HIGH and set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out Before Servicing procedure and re­examine the connections to the component being tested.
When all service work is completed and the oven is fully assembled, the microwave power output should be checked and microwave leakage test should be carried out.
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MICROWAVE MEASUREMENT PROCEDURE

A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
2) Safety interlock switches: Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing: Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet. Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made of an electrically nonconductive material such as glass or plastic. The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal has been breached (eg., around the switches, indicator, and vents). While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
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SERVICE MANUAL
R-201FK/W R-203FW R-205FW R-206FW
MICROWAVE OVEN
R-201FK/ R-201FW/ R-203FW/ R-205FW/ R-206FW
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-201FK, R-201FW, R-203FW, R­205FW and R-206FW.
It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and microwave radiation hazard.
WARNING
Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is not any other visible damage with the oven.
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
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PRODUCT DESCRIPTION

SPECIFICATIONS
ITEM DESCRIPTION
Power Requirements 120 Volts
60 Hertz
Single phase, 3 wire grounded Power Consumption 1100W / Approx. 9.6 Amperes Power Output 700 W nominal of RF microwave energy (IEC Test procedure)
Operating frequency 2450 MHz Case Dimensions Width 18-1/8"
Height10-7/8"
Depth 13-7/8" Cooking Cavity Dimensions Width 12-5/8"
(0.7 Cubic feet) Height 7-7/8"
Depth 13-1/4" Control Complement Touch Control System
Clock (1:00 - 12:59)
Timer (0 - 99 minutes 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
EXPRESS DEFROST pad, POPCORN pad
INSTANT START pads, Number selection pads
TIMER / CLOCK pad, POWER LEVEL pad
START/ MINUTE PLUS pad, STOP/CLEAR pad Oven Cavity Light Yes Safety Standard UL Listed.
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

GENERAL INFORMATION

GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, 15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When
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R-201FK/W R-203FW R-205FW R-206FW
installing this appliance, observe all applicable codes and ordinances. A short power-supply cord is provided to reduce risks of becoming entangled in
Grounded Receptacle Box
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
3-Pronged Plug
Grounding Pin
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
3-Pronged Receptacle
accidentally. CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM
THIS PLUG.
OVEN DIAGRAM
1 Door open button
Push to open door. 2 Oven door with see-through window 3 Safety door latches
The oven will not operate unless the door is
securely closed. 4 Door hinges 5 Door seals and sealing surfaces 6 Turntable motor shaft 7 Removable turntable support
Carefully place the turntable support in the
center of the oven floor. 8 Removable turntable
Place the turntable securely on the turntable
support. The turntable will rotate clockwise or
counterclockwise. Only remove for cleaning. 9 Ventilation openings (Rear)
TOUCH CONTROL PANEL
5
4
32
9
6
10
13
12
1
11
10 Oven light
It will light when oven is operating. 11 Waveguide cover: DO NOT REMOVE. 12 Auto-Touch control panel 13 Time display: 99 minutes, 99 seconds
8
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R-201FW R-203FW R-205FW R-206FW R-201FK
NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes 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.
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OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during oven operation.
OFF CONDITION
Closing the door activates door sensing switch and second­ary interlock switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 120 volts A.C. is supplied to the control unit. (Figure O-1).
1. The display will show flashing "88:88".
2. To set any program or set the clock, touch the STOP/ CLEAR pad. The display will clear, and " : " will appear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER pads. And program the power level by touching the POWER LEVEL pad. When the START pad is touched, the following operations occur:
1. The contacts of the 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 3.35 volts A.C. output on the filament winding, and approximately 2000 volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.
4. The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed­box, and then into the cavity where the food is placed to be cooked.
5. Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor switch, door sensing switch, secondary interlock switch and primary interlock relay are activated with the following results. The circuits to the oven lamp, turntable motor, the cooling fan motor, and the high voltage components are de-energized, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.
7. The monitor switch is electrically monitoring the operation of the secondary interlock switch and primary interlock relay (RY2) and is mechanically associated with the door
so that it will function in the following sequence.
(1) When the door opens from the closed position, the
secondary interlock switch, door sensing switch and primary interlock relay (RY2) open their contacts. 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. 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 C/T fuse, primary interlock relay (RY2) and secondary interlock switch, causing the C/T fuse to blow.
POWER LEVEL 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 (0% power) 0 sec. 32 sec.
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because approx. 3 seconds are needed for heating of the magnetron filament.
POWER OUTPUT REDUCTION
If the oven is set for more than 20 minutes at 80, 90 or 100% power level, after the first 20 minutes the power level will automatically adjust itself to 70% power to avoid overcook­ing.
6
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
NOTE: " " indicates components with potentials above 250V.
R-201FK/W R-203FW R-205FW R-206FW
C/T FUSE
A3
120V AC 60 Hz
GRN
OL FM
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "P-HI"
4. "START" PAD TOUCHED
CONTROL UNIT
OVEN LAMP
SECONDARY INTERLOCK SWITCH
TEMPERATURE FUSE (OVEN)
(RY-1)
TTM
TURN­TABLE MOTOR
A1
N.O.
(RY-2)
B2 B1
FAN MOTOR
PRIMARY INTERLOCK RELAY
DOOR SENSING SWITCH
COM.
MONITOR SWITCH
POWER TRANSFORMER
CAPACITOR
0.82µF AC2100V
RECTIFIER
MAGNETRON
120V AC 60 Hz
C/T FUSE
A3
CONTROL UNIT
GRN
OL FM
OVEN LAMP
SECONDARY INTERLOCK SWITCH
TEMPERATURE FUSE (OVEN)
(RY-1)
TTM
TURN­TABLE MOTOR
A1
N.O.
(RY-2)
B2 B1
FAN MOTOR
PRIMARY INTERLOCK RELAY
DOOR SENSING SWITCH
COM.
Figure O-2. Oven Schematic-Cooking Condition
7
MONITOR SWITCH
POWER TRANSFORMER
CAPACITOR
0.82µF AC2100V
RECTIFIER
MAGNETRON
R-201FK/W R-203FW R-205FW R-206FW

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM
The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and re­leased from latch hook. Now the door will open.
Latch Heads
Latch Hook
Door Sensing Switch
Door
Switch Lever
Monitor Switch
Secondary Interlock Switch
Figure D-1. Door Open Mechanism
DOOR SENSING AND SECONDARY INTERLOCK SWITCHES
The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the power to all high voltage components. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches. The primary interlock system con­sists of the door sensing switch and primary interlock relay located on the control circuit board.
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 C/T fuse, when the contacts of the primary interlock relay (RY2) and secondary interlock switch fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contacts close (to the ON condition) due to their being normally closed. At this time the primary interlock relay (RY2) and secondary interlock switch are in the OFF condition (contacts open) due to its 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 secondary interlock switch contacts close.
3. If the door is opened, and the primary interlock relay (RY2) and the secondary interlock switch contact fail to
open, the C/T fuse blows simultaneously with closing of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN C/T FUSE,
TEST THE DOOR SENSING SWITCH, PRI­MARY INTERLOCK RELAY (RY2), SECOND­ARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (RE­FER TO CHAPTER "TEST PROCEDURE").
NOTE:C/T FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
TURNTABLE MOTOR
The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the food on the turntable is cooked evenly. 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 vents surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity.
TEMPERATURE FUSE (OVEN)
The temperature fuse, 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 temperature fuse will open. Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the oven cavity, the temperature fuse will open at 248˚F(120˚C), causing the oven to shut down.
C/T FUSE
1. The C/T 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 C/T fuse blows to prevent an electric shock or fire hazard.
3. The C/T fuse, located near the magnetron, is designed to prevent damage to the magnetron. If an over heated condition develops in the magnetron due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc., the C/T fuse will open.
Under normal operation, the C/T fuse remains closed. However, when abnormally high temperatures are reached within the oven cavity, the C/T fuse will open at 248˚F (120˚C), causing the oven to shut down or when the electric currents beyond 13A flow, the C/T fuse will open.
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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 C/T fuse, check the monitor switch, primary
interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the C/T fuse. If C/T fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA027WRKZ as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
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TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
RECK AB C
D
EFFGHRE RE CK
CK = Check / RE = Replace
I/K
CKCK CK J M L
CONDITION
OFF CONDITION
COOKING CONDITION
PROBLEM
Home fuse blows when power cord is plugged into wall receptacle.
C/T fuse blows when power cord is plugged into wall receptacle.
Any letters or 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 time of day should appear in display.)
C/T fuse blows when the door is opened.
Fan motor does not operate. (All other electric components function.)
Oven lamp does not light at all. (All other electric components function.)
Turntable motor does not operate. (All other electric components function.)
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 50% mode. (Operates properly on Cooking Power 100% mode.)
Oven lamp, turntable motor and fan motor do not operate.
Oven goes into EXPRESS DEFROST but food is not defrosted well.
SHORT IN POWER CORD
SHORT OR OPEN WIRING
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
TEMPERATURE FUSE (OVEN)
PRIMARY INTERLOCK SYSTEM
SECONDARY INTERLOCK SWITCH
MONITOR SWITCH
C/T FUSE
OVEN LAMP OR SOCKET
COOLING FAN MOTOR
TURNTABLE MOTOR
CONTROL UNIT OR RELAY
WRONG OPERATION
LOW VOLTAGE
DIRTY OVEN CAVITY
KEY UNIT
FOIL PATTERN ON PWB.
EXPRESS DEFROST
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.

TEST PROCEDURES

COMPONENT TEST
10
TEST PROCEDURES
R-201FK/W R-203FW R-205FW R-206FW
PROCEDURE
LETTER
COMPONENT TEST
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at P-HI (100% Power) selecting more than 60 seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 18 to 33˚F(10 to 18.3˚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 185 ohms (RTRN-A648WRZZ) or 179 ohms (RTRN-A642WRZZ); the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)
11
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TEST PROCEDURES
PROCEDURE
LETTER

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 TEMPERATURE FUSE TEST

1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches approximately 248˚F(120˚C). An open temperature fuse indicates overheating of the oven, exchange the temperature fuse 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.

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.
12
TEST PROCEDURES
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PROCEDURE
LETTER
COMPONENT TEST
8. Run the oven and check all functions.

PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
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 door sensing 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 RELAY (RY2)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.

G MONITOR SWITCH TEST

1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Before performing this test, make sure that the secondary interlock switch and the primary interlock relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity 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.
SCREW DRIVER
RED
GRY
GRY
13
MONITOR SWITCH
OHMMETER
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TEST PROCEDURES
PROCEDURE
LETTER

H BLOWN C/T 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 C/T 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 C/T fuse.
CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, TEST THE PRIMARY INTERLOCK RELAY,
If the C/T fuse is blown by improper switch operation, the C/T fuse and monitor switch must be replaced with "C/T fuse and monitor switch assembly" part number FFS-BA027WRKZ, even if the monitor switch operates normally. The C/T fuse and monitor switch assembly is comprised of a 13 ampere fuse and switch.
A continuity check across the C/T fuse terminals should indicate a closed circuit unless the temperature of the C/T fuse reaches approximately 248˚F(120˚C). An open C/T fuse indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fa air guide.
CAUTION: IF THE C/T FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE
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
SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.
THE C/T FUSE.

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 troubleshooting by unit replacement is described according to the symptoms indicated.
Before testing,
1) Disconnect the power supply cord and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
1. Key Unit. NOTE ;
1) Check key unit ribbon connection before replacement.
2) Re-install the outer case (cabinet).
3) Reconnect the power supply cord after the outer case is installed.
4) 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.
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TEST PROCEDURES
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PROCEDURE
LETTER
COMPONENT TEST
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. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the door sensing switch 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 is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with a beep, the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G 7
G 8
G 9
G10
G 1 G 2 G 3 G 4 G 5 G 6
FRESH
CASSEROLE
ROLLS&
MUFFINS
6 3
TIMER
CLOCK
2
0
89
VEGETABLES
45
1 7
BEVERAGE
EXPRESS DEFROST
SOUP
BAKED
POTATOES
POPCORN
POWER
LEVEL
STOP
CLEAR START
MINUTE
PLUS
15
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TEST PROCEDURES
PROCEDURE
LETTER

K RELAY TEST

COMPONENT TEST
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and blocked 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. 3 of the 2 pin connector (A) and the normal open terminal of the relay RY2 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ....................... Defective relay.
DC. voltage not indicated ................. Check diode which is connected to the relay coil. If diode is
good, control unit is defective.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 12.0V D.C. Oven lamp / Turntable motor / Cooling fan motor RY2 Approx. 12.0V D.C. Power transformer
8. If any abnormal condition is defected, replace the control unit.
9. Disconnect the power supply cord and then remove outer case.
10. Open the door and block it open.
11. Discharge high voltage capacitor.
12. Reconnect all leads removed from components during testing.
13. Re-install the outer case (cabinet).
14. Reconnect the power supply cord after the outer case is installed.
15. Run the oven and check all functions.

L EXPRESS DEFROST TEST

(1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the " EXPRESS DEFROST " pad once. (3) The oven is in Express Defrost cooking condition. (4) The oven will operate as follows.
MENU 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE
EXPRESS DEFROST LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME
0.5lb 70% 1min.9sec. 0% 56sec. 50% 42sec. 30% 45sec.
(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.
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TEST PROCEDURES
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PROCEDURE
LETTER
COMPONENT TEST
STEPS OCCURRENCE CAUSE OR CORRECTION
1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder. 2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the
1
RY2
RY1
VRS1
presence of layer short-circuit (check the primary coil resistance which is approximately 915Ω ± 10%). If any abnormal condition is detected, replace the control unit.
CN-A
3
c
a
(J1)
d
b
T1
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. 3 of the 2-pin connector (A) and the Check supply voltage and oven power cord.
normal open terminal of the relay RY2. The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.
2
side of low voltage transformer. Check and replace control unit.
8) Disconnect the power supply cord and then remove outer case.
9) Open the door and block it open.
10) Discharge high voltage capacitor.
11) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.
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TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units as shown in the touch control panel circuit.
(1) Key Unit (2) Control Unit
The principal functions of these units and their related signals 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 R00, R01, R02, R03, R20 and R21. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R23, K00, K01 and K02 to perform the function that was requested.
Control Unit
Control unit consists of LSI, reset circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit and syn­chronizing signal circuit.
1) Reset Circuit
This circuit generates a signal which resets the LSI to the initial state when power is supplied.
3) Power Source Circuit
This circuit generates voltage 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
VSS -5V LSI(IC1)
4) Relay 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.
2) Indicator Circuit
This circuit consists of 4-digits, 12-segments and 3­common electrodes using a Liquid Crystal Display.
18

DESCRIPTION OF LSI

The I/O signal of the LSI are detailed in the following table.
Pin No. Signal I/O Description
1 RESET IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. 2 TEST IN Connected to GND. 3 VSS IN Power source voltage: -5V.
VSS voltage of power source circuit input. 4 OCS3 IN
5 OCS4 OUT
6 VD1 IN Power source for oscillation circuit. 7 VDD IN Power source voltage input terminal.
8 AVDD IN A/D converter power source voltage.
9 AVREF IN A/D converter power source voltage.
10 AVSS IN Power source voltage: -5V.
11-13 P40-P42 IN Terminal to change functions according to the Model.
14 P43 IN To input signal which communicates the door open/close information to LSI.
15 BZ OUT Signal to sound buzzer (2.0 kHz).
16 R00 OUT Key strobe signal.
17 R01 OUT Key strobe signal.
18 R02 OUT Key strobe signal.
19 R03 OUT Key strobe signal.
20 P20 OUT Key strobe signal.
21 P21 OUT Key strobe signal.
22 P22 OUT Terminal not used. 23 P23 IN Signal similar to K02.
24 K00 IN Signal similar to K02.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the resistor oscillation circuit with
respect to OCS4 terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of OCS3.
Connected to GND.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
AVSS voltage of power source circuit input. Connected to VSS.
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 function.
Door close H level signal (0V). Door open L level (-5V).
A: key touch sound.
B: Completion sound.
0.1 sec.
A
2.0 sec.
B
H : GND
L : -5V H : GND
L : -5V
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G1 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G2 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G3 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G4 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G5 line keys on key matrix is touched.
Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02
terminal while one of G6 line keys on key matrix is touched.
When either G7 line on key matrix is touched, a corresponding signal will be input into
P23.
When either G8 line on key matrix is touched, a corresponding signal will be input into
K00.
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Pin No. Signal I/O Description
25 K01 IN
Signal similar to K02.
When either G9 line on key matrix is touched, a corresponding signal will be input into K01.
26 K02 IN
Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of R00, R01, R02, R03, P20 and P21 will be input into K02. When no key is touched, the signal is held at “H” level.
27 K03 IN Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
H : GND
16.7 msec.
28 COM0 OUT Common data signal.
Connected to LCD (Pin No. COM1)
29 COM1 OUT
Common data signal.
Connected to LCD (Pin No. COM2)
30 COM2 OUT Common data signal.
Connected to LCD (Pin No. COM3) 31 COM3 OUT Terminal not used. 32-33 SEG0-SEG1 OUT Terminal not used. 34 SEG2 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
The signals holds “L” level during micro-
wave 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.
Maximaum output
70% of maximaum output
OFF
ON
OFF OFF
ON
35 SEG3 OUT Terminal not used. 36 SEG4 OUT Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The
16.7 msec.
square waveform voltage is delivered to
the RY1 driving circuit and RY2 control
circuit.
During cooking
24 sec.
8 sec.
L (-5V)
H : GND
L : -5V H : GND
L : -5V
H : GND
L : -5V
37-39 SEG5-SEG7 OUT Terminal not used. 40-51
SEG8-SEG19
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD segment LSI signal (Pin No.) LCD segment SEG 8 (40)
SEG 9 (41) SEG 10 (42) SEG 11 (43) SEG 12 (44) SEG 13 (45)
....................
....................
....................
....................
....................
....................
SEG 12 SEG 14 (46) SEG 11 SEG 15 (47) SEG 10 SEG 16 (48) SEG 9 SEG 17 (49) SEG 8 SEG 18 (50) SEG 7 SEG 19 (51)
52-53 VC1-VC2 IN Power source voltage input terminal.
Standard voltage for LCD. 54 VC3 OUT Terminal not used.
20
.....................
.....................
.....................
.....................
.....................
.....................
SEG 6 SEG 5 SEG 4 SEG 3 SEG 2 SEG 1

SERVICING

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1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high voltage power source, static electricity charge in clothes, etc., and sometimes it is not fully protected by the built-in protection circuit. In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in aluminium foil. Also wrap 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 so long enough that they may be separated from each other. For those models, therefore, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if the dummy resistor(s) with resistance equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel; it is also possible to check the sensor­related controls of the touch control panel by using the dummy resistor(s).
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 connector of the key unit to the control unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.
5) Be sure to use specified components where high precision is required.
21
R-201FK/W
Special Screw
Screw Driver Type: TORX T20 H or GTXH20-100
R-203FW R-205FW R-206FW

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. Make sure that a definite click can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a click as the door switches operate.)
3. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operating the oven. Do not operate the oven if any of the following conditions exist;

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 and Oven cavity.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
3) Sharp edge: Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate.
4) Movable parts (to prevent a fault) Fan blade, Fan motor, Switch, Switch lever, Open button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and make sure that the wire leads do not come off even if the wire leads are pulled.
5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.
Please refer to OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS, when carrying out any of the following removal procedures:

OUTER CASE REMOVAL

To remove the outer case, procedure 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 three (3) screws from the upper portion of the rear and two (2) screws along the right side of outer case.
5. Slide the entire outer case back out about 1 inch (3 cm)
22
to free it from retaining clips on the cavity face plate.
Terminal
Push
Pull down
1
2
Lever
Positive lock® connector
6. Lift entire outer case from the unit. CAUTION: 1. DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CA-
MAGNETRON REMOVAL
R-201FK/W R-203FW R-205FW R-206FW
PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same locations.
1.
Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from magnetron.
5. Remove the three (3) screws holding the magnetron to the waveguide.

HIGH VOLTAGE COMPONENTS REMOVAL

(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
Disconnect the power supply cord and remove outer case.
1.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Remove one (1) screw holding capacitor holder to rear cabinet.
5. Disconnect the H.V. wire of the H.V. rectifier assembly from the magnetron.
6. Disconnect the filament lead of the power transformer from the H.V. capacitor.
7. Remove one (1) screw holding ground side terminal of high voltage rectifier assembly, and remove capacitor holder.
6. Remove the magnetron from waveguide.
7. Now, the magnetron is free. CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY.
8. Disconnect all the leads and terminals of high voltage rectifier assembly from high voltage capacitor.
9. Now the H.V. rectifier assembly and H.V. capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER ASSEMBLY, ENSURE THAT THE CATH­ODE (GROUND) CONNECTION IS SE­CURELY FIXED TO THE CAPACITOR HOLDER WITH A GROUNDING SCREW.
CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE
RECTIFIER. WHEN REPLACING IT, RE­PLACE HIGH VOLTAGE RECTIFIER ASSEM­BLY.

POWER TRANSFORMER REMOVAL

1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads (main wire harness) from power transformer.
5. Disconnect the lead from magnetron filament.
6. Disconnect the leads of the power transformer from high voltage capacitor.
7. Remove the two (2) screws holding the transformer to bottom plate from the upper side.
8. Remove the transformer.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

1.
Disconnect the power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
CONNECTORS TO THE TERMINALS, IN­STALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU
9. Now the power transformer is free.
Re-install
1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.
2. Secure transformer with two (2) screws to the bottom plate.
3. Re-connect wire leads (primary and high voltage) and filament leads to the power transformer, magnetron and high voltage capacitor, referring to "Pictorial Diagram".
4. Re-install outer case and check that the oven is operating properly.
®
Figure C-1. Positive lock® connector
23
R-201FK/W R-203FW R-205FW R-206FW

CONTROL PANEL ASSEMBLY REMOVAL

1.
Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads from the control unit.

GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT

5. Remove the one (1) screw holding the control panel to the front plate of the oven cavity.
6. Now, the control panel assembly is free.
Removal
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the control panel assembly, referring to chapter of CONTROL PANEL ASSEMBLY REMOVAL.
5. Remove the three (3) screws holding the control unit to the control panel frame. And remove the control unit.
6. Remove the rubber connector from the long slit on the control panel frame.
7. Tear away the graphic sheet from the control panel frame.
8. Tear away the membrane switch from the control panel frame.
Installation
1. Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol.
2. Tear the backing paper from the new membrane switch.
3. Insert the ribbon cable of the membrane switch into the slit of the control panel frame.
4. Adjust the upper edge and right edge of the membrane switch to the small depression on the surface of the control panel frame.
5. Attach the membrane switch to the control panel frame by rubbing with a soft cloth not to scratch.
6. Tear the backing paper from the new graphic sheet.
7. Adjust the upper edge and right edge of the graphic sheet to the large depression on the surface of the control panel frame.
8. Attach the graphic sheet to the control panel frame by rubbing with a soft cloth not to scratch.
9. Tear the small backing paper from the ribbon cable of the membrane switch.
10. Attach the ribbon cable to the control panel frame rear side.
11. Place the edge of the membrane switchs ribbon cable on the lower portion of the liquid crystal display.
12. Insert the rubber connector into the long slit on the control panel frame.
13. Reinstall the control unit to the control panel frame with the three (3) screws.
NOTE: Do not contact the conductor portion of the ribbon cable (edge) and the rubber connector directly with your fingers. This is to avoid oxidized.
Control panel frame
Large depression
Small backing
Graphic sheet
Liquid crystal display
Ribbon cable of membrane switch
paper
Ribbon cable
Membrane switch
Long slit
Slit
Small depression
Control panel frame (Rear side)
Conductor portions
Rubber connector
Figure C-2. Graphic Sheet and Membrane Switch
Replacement

TURNTABLE MOTOR REMOVAL

Removal
1. Disconnect the power supply cord.
2. Remove the turntable and turntable support from the oven cavity.
3. Turn the oven over.
4. Remove the one (1) screw holding the turntable motor cover to the bottom plate.
5. Now, the turntable motor cover is free.
6. Disconnect the wire leads from the turntable motor.
7. Remove the single (1) screw holding the turntable motor to the oven cavity.
8. Remove the turntable motor from the oven cavity.
9. Remove the TTM packing from the turntable motor.
10.Now, the turntable motor is free.
Re-install
1. Re-install the TTM packing.
2. Re-install the turntable motor with theTTM packing with the single (1) screw.
24
TTM packing
Turntable motor
3. Re-connect the wire leads to the turntable motor.
4. Insert the tab of the turntable motor cover into the hole of the bottom plate.
5. Re-install the turntable motor cover to the bottom plate with one (1) screw.

COOLING FAN MOTOR REMOVAL

Figure C-3. TTM packing Installation
R-201FK/W R-203FW R-205FW R-206FW
REMOVAL
1.
Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the magnetron from the waveguide. Refer to chapter "MAGNETRON REMOVAL"
5. Disconnect the wire lead from the C/T fuse.
6. Remove the one (1) screw to get the C/T fuse off.
7. Disconnect the wire leads from the fan motor.
8. Remove the wire leads from the hole of the fan duct.
9. Remove the three (3) screws holding the fan duct to the oven cavity.
10.Release the fan motor 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 any pieces do not enter the gap
between the rotor and the stator of the fan motor. Because the rotor is easy to be 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 assembly 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.
Coil
Groove joint pliers
CAUTION:
• Do not re-use the removed fan blade because the hole (for shaft) may be larger than normal.
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 transformed.
• Make sure that the fan blade rotates smooth after
installed.
• Make sure that the axis of the shaft is not slanted.
6. Install the fan motor assembly to the oven cavity with three (3) screws.
7. Re-install the C/T fuse to the oven cavity with the one (1) screw.
8. Install the magnetron with three (3) screws.
9. Re-install the wire leads into the hole of the fan duct.
10.Connect the wire leads to the magnetron and the fan motor, referring to the pictorial diagram.
Shaft
Stator
Gap Bracket
Rotor
Rear View
Axis
Shaft
Stator
Rotor
Side View
These are the positions that should be pinched with pliers.
Table
Center of bracket

DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL

1.
Disconnect the power supply cord and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from the switches.
5. Remove two (2) screws holding latch hook to oven flange.
6. Remove the switch lever from the oven cavity
7. Remove latch hook assembly from oven flange.
8. Push outward on the two (2) retaining tabs holding switch in place.
9. Switch is now free.
25
R-201FK/W R-203FW R-205FW R-206FW
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. Install the switch lever to the oven cavity
5. 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 door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter. (Refer to Microwave Measurement Procedure.)
Latch Heads
Latch Hook
Door Sensing Switch
Door
Switch Lever
Monitor Switch
Secondary Interlock Switch
Figure C-4. 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 corner portion of door panel as shown in Figure C-5 to free engaging parts.
4. Pry the choke cover by inserting a putty knife in order shown in figure C-5.
5. Release choke cover from door panel.
6. Now choke cover is free.
NOTE: When carrying out any repair to the door, do not
bend or warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage.
Choke Cover
7
6
5
8
3
4
Figure C-5. Door Disassembly
9
10
11
1
2
Putty Knife
Door Frame
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 is free from oven cavity.
9. Release door panel from ten (10) tabs of door frame and remove door frame by sliding the door panel downward.
10.Now, door panel with sealer film is free.
11.Tear sealer film from door panel.
12.Now, door panel is free.
13.Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.
14.Now, latch head and latch spring are free.
15.Remove door screen from door frame.
16.Now, door screen is free.
RE-INSTALL
1. Re-install door screen to door frame.
2. Re-install latch spring to the head. Re-install latch spring to the door frame. Re-install latch head to the door frame.
3. Re-install door panel to door frame by fitting ten (10) tabs of door frame to ten (10) holes of door panel.
4. Put sealer film on door panel. Refer to "Sealer Film" and figure C-7, on how to handle the new film.
26
5. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges.
6. Re-install choke cover to door panel by pushing.
Note: After any service to the door; (A) Make sure that door sensing switch, secondary
interlock switch and monitor 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.
R-201FK/W R-203FW R-205FW R-206FW
Pin
Pin
Door Panel
Lower Oven Hinge
Upper Oven Hinge
Slit Choke
Lower Oven Hinge
Choke Cover
Figure C-6. Door Replacement

SEALER FILM

Installation
1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7.
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-7. Sealer film
27
R-201FK/W R-203FW R-205FW R-206FW
1
2
3
45
6
A
HIGH
VOLTAGE
CAPACITOR
POWER SUPPLY CORD
120V 60Hz
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
B
C
D
kept tight.
WHT
GRD
N
H
RED
WHT
WHT
RED
WHT
GRY
ORG
RED
BLK
RED
C/T FUSE
HIGH VOLTAGE COMPONENTS
H.V.
RECTIFIER
MAGNETRON
(RED)
(RED)
(WHT)
ORG
POWER
TRANSFORMER
GRY
A
B
C
D
OVEN LAMP
FAN MOTOR
GRY
ORG
ORG
BLK
E
TEMPERATURE
FUSE (OVEN)
TURNTABLE
MOTOR
ORG
GRY
GRN
N.O.
DOOR
F
G
H
SENSING SWITCH
GRN
GRN
COM
GRY
GRN
CN-B
2
1
1
2
PRIMARY
INTERLOCK
RELAY
CN-B
CONTROL PANEL
RY2
ORG
COM.
RED
T1
RY1
1
N.O.
ORG
RED
CN-A
3
GRY
N.C.
MONITOR
GRY
COM
SWITCH
ORG
CN-A
1
WHT
2
3
WHT
WHT
WHT
N.O.
N.O.
COM
SECONDARY
INTERLOCK SWITCH
COM
GRY
Figure S-1. Pictorial Diagram
E
F
G
H
1
2
3
45
6
28
R-201FK/W R-203FW R-205FW R-206FW
CLEAR
START
SOUP
1
0
CLOCK
MUFFINS
G 9
R77 220k
6
PLUS
MINUTE
BAKED
POTATOES
7
8
9
G10
R78 220k
A
B
KEY UNIT
C
D
1
COM1 COM2 COM3 SEG1
A
SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9
SEG10 SEG11 SEG12
ON DEF. LBS QTY. CHECK
LIQUID CRYSTAL DISPLAY
B
2
SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19
3
44
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG12
SEG11
SEG10
SEG1
1
­IC
VC1 VC2
C3 0.01µ/25v
C5
0.1µ/25v
VC3
54
C6
0.1µ/25v
1
TEST
RESET
VSS
OSC3
OSC4
VD1
VDD
AVDD
AVSS
AVREF
45
POPCORN
BEVERAGE
FRESH
30
COM3
P41
COM2
P42
29 45
COM1
COM0 K03 K02 K01 K00 P23 P22 P21 P20 R03 R02 R01 R00
BZ
15
P43
14
G 3 G 4 G 5 G 6
G 1 G 2
G 7
SEG0
P40
LEVEL
POWER
EXPRESS
DEFROST
4
VEGETABLES
2
5
6
3
CASSEROLE
G 8
STOP
TIMER
ROLLS&
C
/25v
0.01µ C4
R5 1k
D
R6 15k
Q1
2SA1037AK
/25v
0.1µ C10
0.01µ/25v C11
R10 15k
Q10
DTA143EAK
C1 0.1µ/25v
R50 20kF
Q30
DTA143EAK
R30 3.3k
C7
0.1µ
/25v
Q20
R20 15k
C20
DTA143EAK
0.1µ/25v R41 15k
C40 0.01µ/25v
R40 4.7k
R75 220k
R76 220k
CPU UNIT
5V
RST
E
GND
-
ZD1 HZ4B3
VR
INT
P42
P41
P40
BZ
COM
M
DOOR
E
C8 220µ/10v
+
Figure S-2. Control Panel Circuit
(J14)(J15)
(J12)(J13)
F
(J10)(J11)
POWER UNIT
SP1
Q22
DTA123JS
D22
D40
±
5%
F
R4 910 1/2w
C2 470µ/25v
+
D3
D4
G
D1-D4
1N4002
H
D2
D1
T1
10G471K
d
VRS1
ab
(J1)
c
A3
CN-A
AC(N)
C120V
60Hz
1
2
Q21
DTD143ES
D20D21
RY1
A1
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
3
C21 10µ/35v
+
IF NOT SPECIFIED, 1/10W
IF NOT SPECIFIED, 1SS270A
:
:
NOTE
G
RY2
B1
B2
NO
COM
AC(H)
MICRO
CN-B
DOOR
SENSING
SWITCH
45
H
6
29
R-201FK/W R-203FW R-205FW R-206FW
1
2
3
45
6
A
B
CN-B
21
UNIT CODE
D40
C
D
D22
D21
D20
SP1
R4
ZD1
3
1
E
F
RY2
1
RY1
2
VRS1
C8
(J10)
(J11)
S
DIP
CHIP SIDE
(J13)
(J12)
(J14)
(J15)
4
D2
Q22
E
B
5
C21
Q21
E
C2
D3
D4
A
B
C
D
E
F
D1
CN-A
G
3
(J1)
P
G
T1
H
1
2
Figure S-3. Printed Wiring Board
3
45

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-MA085WRE0 Secondary interlock switch/ Door sensing switch 2 AF 1- 1 QSW-MA137WRE0 1- 2 FFS-BA027WRKZ 1- 3 FACCDA079WRE0 Power supply cord 1 AF 1- 3 FACCDA064WRE0 Power supply cord (Interchangeable) 1 AP 1- 4 FH-DZA102WRKZ High voltage rectifier assy 1 AN
*
1- 4 FH-DZA088WRK0 High voltage rectifier assy (Interchangeable) 1 AP
*
1- 5 RC-PZA041WRE0 High voltage capacitor 1 AS
*
*
1- 5 RC-QZA307WRZZ High voltage capacitor (Interchangeable) 1 AX
*
1- 5 RC-QZA308WRZZ High voltage capacitor (Interchangeable) 1 AN 1- 6 RMOTEA383WRE0 Fan motor 1 AV 1- 6 RMOTEA355WRE0 Fan motor (Interchangeable) 1 AU 1- 6 RMOTEA408WRZZ Fan motor (Interchangeable) for production use 1 -­1- 7 RV-MZA226WRE0 Magnetron 1 BE
*
1- 7 RV-MZA306WRZZ Magnetron (Interchangeable) 1 BL
*
1- 8 RLMPTA082WRZZ Oven lamp 1 AL 1- 9 RMOTDA186WRE0 Turntable motor 1 AW 1- 9 RMOTDA211WRE0 Turntable motor (Interchangeable) 1 AS 1-10 QFS-TA038WRE0 Temperature fuse 120deg. C (Oven) 1 AK 1-11 RTRN-A648WRZZ Power transformer 1 BH
*
1-11 RTRN-A642WRZZ Power transformer (Interchangeable) 1 BH
*
Secondary interlock switch/ Door sensing switch (Interchangeable) C/T fuse (120˚C, 13A) and monitor switch assembly (AM51620C53Y1)
H
6
2AH 1AS
30
REF. NO. PART NO. DESCRIPTION Q'TY CODE
CABINET PARTS
2- 1 GCABUA828WRPZ Outer case cabinet [R-201FK] 1 BD 2- 1 GCABUA817WRPZ Outer case cabinet [R-201FW][R-203FW][R-205FW][R-206FW] 1 BD 2- 2 GLEGPA074WRE0 Foot 2 AC
CONTROL PANEL PARTS
3- 1 FPNLCB636WRKZ Control panel frame with key unit [R-201FK] 1 BA 3- 1 FPNLCB623WRKZ Control panel frame with key unit [R-201FW] 1 BA 3- 1 FPNLCB622WRKZ Control panel frame with key unit [R-203FW] 1 BA 3- 1 FPNLCB635WRKZ Control panel frame with key unit [R-205FW] 1 BA 3- 1 FPNLCB634WRKZ Control panel frame with key unit [R-206FW] 1 BA 3- 1-1 PSHEPA823WREZ Graphic sheet [R-201FK] 1 AV 3- 1-1 PSHEPA802WREZ Graphic sheet [R-201FW] 1 AV 3- 1-1 PSHEPA801WREZ Graphic sheet [R-203FW] 1 AX 3- 1-1 PSHEPA822WREZ Graphic sheet [R-205FW] 1 AV 3- 1-1 PSHEPA821WREZ Graphic sheet [R-206FW] 1 AX 3- 1-2 QSW-KA014DRZZ Membrane switch 1 AQ 3- 2 JBTN-B175WRFZ Open button [R-201FK] 1 AG 3- 2 JBTN-B165WRFZ Open button [R-201FW] [R-203FW] [R-205FW] [R-206FW] 1 AH 3- 3 MSPRCA050WRE0 Open button spring 1 AB 3- 4 DPWBFC247WRUZ Control unit 1 BE 3- 5 QCNC-A014WRZZ Rubber connector 1 AE 3- 6 RLCDSA105DRZZ Liquid crystal display 1 AQ 3- 7 XEPSD30P08XS0 Screw; 3mm x 8mm 3 AA
OVENPARTS
4- 1 PHOK-A120WRFZ Latch hook 1 AH
4- 2 LBNDKA038WRP0 Capacitor holder 1 AF 4- 3 NFANJA029WRE0 Fan blade 1 AK 4- 4 PDUC-A788WRWZ Fan duct 1 AR 4- 5 ************* Oven cavity (Not replaceable part) 1--
4- 6 GCOVHA425WRPZ Turntable motor cover 1 AK 4- 7 MLEVPA241WRFZ Switch lever 1 AG 4- 8 PCOVPA276WRE0 Waveguide cover 1 AM 4- 9 PCUSUA237WRP0 Cushion 2 AF 4-10 PPACGA176WREZ TTM packing 1 AC 4-11 PCUSUA278WRP0 Cushion 1 AB 4-12 PCUSGA568WREZ Cushion 1 AC
DOORPARTS
5- 1 FDORFA348WRTZ Door panel assembly 1 BC
5- 2 GWAKPA854WRRZ Door frame [R-201FK] 1 AW
5- 2 GWAKPA836WRRZ Door frame [R-201FW][R-203FW][R-205FW][R-206FW] 1 AW
5- 3 HPNL-A764WREZ Door screen [R-201FK][R-201FW] 1 AP 5- 3 HPNL-A773WRRZ Door screen [R-203FW][R-205FW][R-206FW] 1 AQ 5- 4 LSTPPA205WRFZ Latch head 1 AF
5- 5 MSPRTA187WRE0 Spring 1 AC 5- 6 PSHEPA782WREZ Sealer film 1 AG 5- 7 GCOVHA424WRFZ Choke cover 1 AK
MISCELLANEOUS
6- 1 NTNT-A034WRF0 Turntable 1 AM 6- 2 FROLPA099WRKZ Turntable support 1 AP 6- 3 TCAUAA258WRRZ Monitor caution 1 AC 6- 4 TCAUAA268WRRZ DHHS caution label 1 AF 6- 5 TINSEA929WRRZ Instruction book 1 AM 6- 6 FW-VZB837WREZ Main wire harness 1 AR
SCREWS,NUTS AND WASHERS
7- 1 XHPSD40P08K00 screw : 4 mm x 8 mm 2 AC 7- 2 XHTSD40P08RV0 Screw : 4mm x 8mm 4 AA 7- 3 LX-CZA070WRE0 Special screw (Torx tamper pfoof screw) 2 AC 7- 4 LX-CZ0052WRE0 Special screw 2 AA 7- 5 LX-EZA042WRE0 Special screw 2 AB 7- 6 XHPSD30P06000 Screw : 3mm x 6mm 1 AA 7- 7 XHPSD40P08000 Screw : 4mm x 8mm 3 AA 7- 8 XHTSD40P12RV0 Screw : 4mm x 12mm 1 AA 7- 9 XOTSF40P08000 Screw : 4mm x 8mm [R-201FK] 2 AA 7- 9 XOTSE40P08000 Screw : 4mm x 8mm 7- 10 XOTSD40P08000 Screw : 4mm x 8mm 7 AA 7- 11 XCPSD40P06000 Screw : 4mm x 6mm 1 AA
[R-201FW][R-203FW][R-205FW][R-206FW]
2AA
R-201FK/W R-203FW R-205FW R-206FW
31
R-201FK/W R-203FW R-205FW R-206FW

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.
1
A
CONTROL PANEL PARTS
2
3
Before attaching Control unit to Control panel, foil side of Control unit must be
45
6
A
cleaned by ethyl-alcohol.
3-1
B
3-7
B
3-5
3-1-1
3-4
C
3-6
C
DOOR PARTS
5-7
D
3-1-2
5-6
D
3-2
3-3
E
E
5-1
5-2
F
G
H
5-3
5-5
5-4
MISCELLANEOUS
6-6
Actual wire harness may be different than illustration.
F
G
H
1
2
3
45
6
32
R-201FK/W R-203FW R-205FW R-206FW
1
2
3
45
6

OVEN AND CABINET PARTS

A
2-1
7-10
A
7-3
7-10
7-10
B
B
7-3
1-8
7-10
C
7-9
4-3
7-6
C
1-2
7-10
7-7
7-9
7-2
4-12
4-9
6-4
D
1-10
6-3
1-7
4-4
1-6
7-10
D
7-8
7-10
4-11
1-11
1-3
E
4-9
7-5
E
4-5
7-2
7-11
F
F
4-8
4-1
6-1
2-2
G
6-2
7-1
4-10
1-9
2-2
4-7
7-4
1-1
1-2 1-1
1-4
4-2
7-1
G
1-5
4-6
H
1
2
7-2
3
45
6
H
33
R-201FK/W R-203FW R-205FW R-206FW
1
2
3
45
6
A

PACKING AND ACCESSORIES

B
C
D
E
INTO THE OVEN CAVITY
F
G
TRAY PAD ASSY
H
(CPADBA287WRKZ)
DOOR PROTECTION SHEET SPADPA580WRE0
6-5 INSTRUCTION BOOK
6-1 TURNTABLE TRAY
6-2 TURNRTABLE SUPPORT
MICROWAVE OVEN
Not replaceable items.
TOP PAD ASSEMBLY FPADBA454WRKZ
POLYETHYLENG BAG SSAKHA014WRE0
BOTTOM PAD ASSEMBLY FPADBA455WRKZ
PACKING CASE
SPAKCD701WREZ [R-201FW] SPAKCD732WREZ [R-201FK] FPAK-A420WRKZ [R-203FW] FPAK-A429WRKZ [R-205FW] SPAKCD730WREZ [R-206FW]
A
B
C
D
E
F
G
H
1
2
3
45
6
COPYRIGHT © 2002 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
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.
34
2002SHARP CORP. (1S1.70E) Printed in U.S.A
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