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Sharp R-203CW Service Manual

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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 .............................................................................................................................. 8
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 17
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 21
PICTORIAL DIAGRAM ........................................................................................................................................ 27
CONTROL PANEL CIRCUIT ............................................................................................................................... 28
PRINTED WIRING BOARD ................................................................................................................................. 29
PARTS LIST ........................................................................................................................................................ 30
PACKING AND ACCESSORIES ......................................................................................................................... 34
SHARP CORPORATION
SERVICE MANUAL
MODEL
ON
DEF. LBS.
QTY. CHECK
1. Grou nd mea
t
2. Stea ks/c hops
3. Chic ken
piec es
COM PU DEFR
To adju st quan
OST
tity- touc h pad
SN AC KS
agai n
POPC ORN
BEVE RAGE
CO OK ING
BAK ED
FRES H
POTA TO
VEGE TABL ES
In the interest of user-safety the oven should be restored to its original
RE HE AT ING
DINN ER
PLAT E
ROL L,
MUF FIN
condition and only parts identical to those specified should be used.
1
2
3
4
5
6
7
8
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
9
Pow er
Lev el
0
Tim er
Clo ck
Sto p
tain circuitry capable of producing very high voltage and
ST AR T
Cle ar
Min ute Plu
s
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Recti-
fier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

MICROWAVE OVEN
R-203CW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-203CW
S2902R203CPW/
Page

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Summary of Contents for Sharp R-203CW

  • Page 1: Table Of Contents

    R-203CW SERVICE MANUAL S2902R203CPW/ MICROWAVE OVEN R-203CW MODEL DEF. LBS. QTY. CHECK 1. Grou nd mea 2. Stea ks/c hops 3. Chic ken piec es COM PU DEFR To adju st quan tity- touc h pad SN AC KS agai n...

  • Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    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.

  • Page 3: Warning To Service Personnel

    R-203CW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 4: Microwave Measurement Procedure

    R-203CW 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/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...

  • Page 5: Foreword And Warning

    MICROWAVE OVEN R-203CW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-203CW. It is recommended that service personnel carefully study the entire...

  • Page 6: Product Specifications

    R-203CW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase, 3 wire grounded Power Consumption 1100W / Approx. 9.5 Amperes Power Output 700 W nominal of RF microwave energy (IEC 705 Test procedure) Operating frequency 2450 MHz Case Dimensions Width 18-1/8"...

  • Page 7: Oven Diagram

    R-203CW Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, Grounded 3-Pronged Plug 15 or 20 amp. fused electrical supply. It is recommended that a separate Receptacle Box circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

  • Page 8: Operation

    R-203CW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay (RY2) and is mechanically associated with the door oven operation. so that it will function in the following sequence. (1) When the door opens from the closed position, the...

  • Page 9: Description And Function Of Components

    R-203CW C/T FUSE MAGNETRON THERMAL CUT-OUT SCHEMATIC NOTE: CONDITION OF OVEN COM. POWER TRANSFORMER N.O. 1. DOOR CLOSED CLOCK APPEARS ON DISPLAY (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CAPACITOR CONTROL UNIT 0.86µF 120V AC 60 Hz DOOR SENSING MONITOR SWITCH SWITCH...

  • Page 10: Troubleshooting Guide

    R-203CW blowing the C/T fuse, when the contacts of the primary cool air. This cool air is directed through the air vanes interlock relay (RY2) and secondary interlock switch fail to surrounding the magnetron and cools the magnetron. This open when the door is opened.
  • Page 11 R-203CW 4. Disconnect the leads to the primary of the power transformer. 5. sge 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.

  • Page 12: Test Procedure

    R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 13 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 14 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 15 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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"...
  • Page 16 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 17 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER DINNER COMPU BEVERAGE PLATE DEFROST FRESH Power VEGETABLES Level Timer Stop ROLL, BAKED MUFFIN POTATO Clock Clear START POPCORN Minute Plus RELAY TEST 1. Disconnect the power supply cord and then remove outer case.
  • Page 18 R-203CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.

  • Page 19: Touch Control Panel

    R-203CW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units as This circuit generates voltage necessary in the control shown in the touch control panel circuit. unit from the AC line voltage. In addition, the synchronizing...

  • Page 20: Description Of Lsi

    R-203CW DESCRIPTION OF LSI LSI(IZA868DR) The I/O signal of the LSI(IZA868DR) are detailed in the following table. Pin No. Signal Description 1-12 Segment data signal. SEG0-SEG11 Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.)
  • Page 21 R-203CW Pin No. Signal Description INT2 Signal synchronized with commercial power source frequency. This is the basic timing for time processing of LSI. H : GND L : -5V 16.7 msec Key strobe signal. Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one of G6 line keys on key matrix is touched.
  • Page 22 R-203CW SERVICING 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer This unit uses CMOS LSI in the integral part of the case is installed. circuits. When handling these parts, the following 6) Run the oven and check all function.

  • Page 23: Component Replacement And Adjustment Procedure

    3. The door gasket or seal is damaged. 4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following pre- 3) Sharp edge: cautions. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 24 R-203CW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE. Torx screws must be reinstalled in the same 2. DISCHARGE THE HIGH VOLTAGE CA- locations. PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

  • Page 25: Control Panel Assembly Removal

    Re-install 3. Turn the oven over. 1. Remove any sharp edges on the turntable motor cover 4. Cut the four (4) bridges holding the turntable motor cover and the bottom plate with the cutting pliers. to the bottom plate with the cutting pliers as shown in 2.

  • Page 26: Pictorial Diagram

    R-203CW COOLING FAN MOTOR REMOVAL 15. Remove the two (2) screws holding the fan motor to the REMOVAL fan duct. 1. Disconnect the power supply cord and remove outer case. 16. Now, the fan motor is free. 2. Open the door and block it open.
  • Page 27 R-203CW 8-2. Then pull out the switch while pushing the plunger of the 5. Re-connect wire leads to the control unit. Refer to switch again. chapter "Pictorial Diagram". 8-3. Now the secondary interlock switch is free. 6. Make sure that monitor switch is operating properly and 9.
  • Page 28 R-203CW 5. Release choke cover from door panel. Note: The door on a microwave oven is designed to act as 6. Now choke cover is free. an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle.
  • Page 29 R-203CW...

  • Page 30: Control Panel Circuit

    R-203CW...

  • Page 31: Printed Wiring Board

    R-203CW (J7) (J5) (J3) (J6) (J4) (J2) (J1) CN - B DOOR SW AC (N) FM TTM Figure S-3. Printed Wiring Board...

  • Page 32: Parts List

    R-203CW 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-MA131WRE0 Secondary interlock switch & door sensing switch...
  • Page 33 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.
  • Page 34 R-203CW 7-11 OVEN AND CABINET PARTS 7-10 7-11 7-10 4-17 6-10 7-12 4-14 6-10 4-11 6-11 1-11 4-16 1-10 4-10 4-15 1-12 4-13 4-12...
  • Page 35 R-203CW Befor attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethyl- CONTROL PANEL PARTS alcohol. 3-2-2 DOOR PARTS 3-2-1 MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 36: Packing And Accessories

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

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