Sharp R-202EW Service Manual
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Sharp R-202EW 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 .............................................................................................................................. 9
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 27
CONTROL PANEL CIRCUIT ............................................................................................................................... 28
PARTS LIST ........................................................................................................................................................ 29
PACKING AND ACCESSORIES ......................................................................................................................... 33
SHARP CORPORATION
SERVICE MANUAL
MODELS
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-
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 Recti-
fier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTS

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
MICROWAVE OVEN
R-202EW
R-203EW
R-202EW
R-203EW
S7116R202EPW/
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  • Page 1: Table Of Contents

    R-202EW R-203EW SERVICE MANUAL S7116R202EPW/ MICROWAVE OVEN R-202EW MODELS R-203EW 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-...

  • 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-202EW R-203EW 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-202EW R-203EW 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-202EW/ R-203EW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-202EW and R-203EW. OPERATION 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.

  • Page 6: Product Specifications

    R-202EW R-203EW 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"...
  • Page 7 R-202EW R-203EW 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 Grounded Receptacle Box circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.

  • Page 8: Operation

    R-202EW R-203EW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during so that it will function in the following sequence. oven operation. (1) When the door opens from the closed position, the secondary interlock switch, door sensing switch and OFF CONDITION primary interlock relay (RY2) open their contacts.
  • Page 9 R-202EW R-203EW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY C/T FUSE TEMPERATURE FUSE (OVEN) N.O. POWER TRANSFORMER COM. (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CAPACITOR CONTROL UNIT 0.82 F AC2100V 120V AC DOOR 60 Hz...
  • Page 10 R-202EW R-203EW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the C/T fuse blows simultaneously with closing of the monitor switch contacts. The door is opened by pushing the open button on the control panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-202EW R-203EW 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.

  • Page 12: Test Procedure

    R-202EW R-203EW CK = Check / RE = Replace A B C D E F F G H TEST PROCEDURE RE CK RE RE CK CK CK CK J POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle.
  • Page 13 R-202EW R-203EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 14 R-202EW R-203EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 15 R-202EW R-203EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 16 R-202EW R-203EW 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 17 R-202EW R-203EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the key unit is defective. 1) Disconnect the power supply cord and then remove outer case. 2) Open the door and block it open. 3) Discharge high voltage capacitor. 4) Replace the key unit.
  • Page 18 R-202EW R-203EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MINUTE REHEAT BEVERAGE PLUS FRESH POWER EXPRESS VEGETABLES DEFROST LEVEL ROLLS TIMER BAKED STOP MUFFINS POTATOES CLOCK CLEAR POPCORN START RELAY TEST 1. Disconnect the power supply cord and then remove outer case.
  • Page 19 R-202EW R-203EW 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 20: Touch Control Panel

    R-202EW R-203EW 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.

  • Page 21: Description Of Lsi

    R-202EW R-203EW DESCRIPTION OF LSI The I/O signal of the LSI are detailed in the following table. Pin No. Signal Description RESET Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to “L”...
  • Page 22 R-202EW R-203EW Pin No. Signal Description Signal similar to K02. When either G8 line on key matrix is touched, a corresponding signal will be input into K00. Signal similar to K02. When either G9 line on key matrix is touched, a corresponding signal will be input into K01.
  • Page 23 R-202EW R-203EW SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the touch control panel and the oven itself is so short that the circuits.

  • Page 24: Component Replacement And Adjustment Procedure

    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 25 R-202EW R-203EW to free it from retaining clips on the cavity face plate. PACITOR BEFORE TOUCHING ANY OVEN 6. Lift entire outer case from the unit. COMPONENTS OR WIRING. CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE.
  • Page 26 R-202EW R-203EW CONTROL PANEL ASSEMBLY REMOVAL 1. Disconnect the power supply cord and remove outer case. NOTE: 1. Before attaching a new key unit, remove remaining 2. Open the door and block it open. adhesive on the control panel frame surfaces 3.

  • Page 27: Pictorial Diagram

    R-202EW R-203EW CAUTION: 7. Re-install the C/T fuse to the oven cavity with the one (1) • Do not hit the fan blade strongly when installed screw. because the bracket may be transformed. 8. Install the magnetron with three (3) screws.

  • Page 28: Door Replacement

    R-202EW R-203EW DOOR REPLACEMENT REMOVAL After any service, make sure of the following : 1. Disconnect the power supply cord. 1. Door latch heads smoothly catch latch hook through 2. Open the door slightly. latch holes and that latch head goes through center of 3.
  • Page 29 R-202EW R-203EW...

  • Page 30: Control Panel Circuit

    R-202EW R-203EW COM1 COM2 COM3 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 COM1 SEG14 COM0 SEG15 SEG16 SEG17 SEG18 SEG19 /25v 0.01 /25v 0.01 /25v 0.01 20kF /25v /25v 0.01 4.7k /25v 3.3k HZ4B3...

  • Page 31: Parts List

    5- 5 MSPRTA187WRE0 Spring 5- 6 PSHEPA782WREZ Sealer film 5- 7 GCOVHA424WRFZ Choke cover MISCELLANEOUS 6- 1 NTNT-A034WRF0 Turntable [R-202EW] 6- 1 NTNT-A060WRE0 Turntable [R-203EW] 6- 2 FROLPA099WRKZ Turntable support 6- 3 TCAUAA258WRRZ Monitor caution 6- 4 TCAUAA268WRRZ DHHS caution...
  • Page 32 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 33 R-202EW R-203EW OVEN AND CABINET PARTS 7-10 7-10 7-10 7-10 7-10 1-10 7-10 1-11 7-10 4-10 7-10...
  • Page 34 R-202EW R-203EW CONTROL PANEL PARTS Before attaching Control unit to Control panel, foil side of Control unit must be cleaned by ethyl-alcohol. 3-1-1 DOOR PARTS MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 35: Packing And Accessories

    PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA454WRKZ POLYETHYLENG BAG SSAKHA014WRE0 6-5 INSTRUCTION BOOK 6-1 TURNTABLE TRAY MICROWAVE OVEN BOTTOM PAD ASSEMBLY FPADBA455WRKZ 6-2 TURNRTABLE SUPPORT INTO THE OVEN CAVITY PACKING CASE Not replaceable items. SPAKCD593WREZ [R-202EW] FPAK-A409WRKZ [R-203EW] TRAY PAD ASSY (CPADBA287WRKZ)
  • Page 36 R-202EW R-203EW COPYRIGHT © 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be repro- duced, stored in retrieval systems, or trans- mitted in any form or by any means, elec- tronic, mechanical, photocopying, record- ing, or otherwise, without prior written per- mission of the publisher.

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