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Sharp R-230HW Service Manual
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Sharp R-230HW Service Manual

Service manual
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R-230HW
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
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.
35
MICROWAVE OVEN
R-203HW
R-220HW
R-230HW
R-203HW
R-220HW
R-230HW
S2303R220HPW/
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  • Page 1: Table Of Contents

    R-203HW R-220HW R-230HW SERVICE MANUAL S2303R220HPW/ MICROWAVE OVEN R-203HW MODELS R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW/ R-220HW/ R-230HW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-203HW, R-220HW and R-230HW. 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-203HW R-220HW R-230HW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase, 3 wire grounded Power Consumption 1200W / Approx. 10.3 Amperes Power Output 800 W nominal of RF microwave energy (IEC Test procedure) Operating frequency 2450 MHz Case Dimensions Width 18-1/8"...
  • Page 7 R-203HW R-220HW R-230HW Electrical Requirements The electrical requirements are a 115 -120 volt 60 Hz, AC only, 15 or 20 amp. Grounded Receptacle Box fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When installing this appliance, observe all appli- cable codes and ordinances.

  • Page 8: Operation

    R-203HW R-220HW R-230HW 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: Oven Schematic-Cooking Condition

    R-203HW R-220HW R-230HW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 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...
  • Page 10 R-203HW R-220HW R-230HW 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 CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, control panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 18 R-203HW R-220HW R-230HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY 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.
  • Page 19 R-203HW R-220HW R-230HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. *Insert jumper wire J1 and solder. Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

  • Page 20: Touch Control Panel

    R-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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.
  • Page 22 R-203HW R-220HW R-230HW Pin No. Signal Description Signal similar to K02. When either G9 line on key matrix is touched, a corresponding signal will be input into K01. 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.
  • Page 23 R-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW 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-203HW R-220HW R-230HW CONTROL PANEL ASSEMBLY REMOVAL 1. Disconnect the power supply cord and remove outer case. 5. Remove the one (1) screw holding the control panel to 2. Open the door and block it open. the front plate of the oven cavity.

  • Page 27: Pictorial Diagram

    R-203HW R-220HW R-230HW TTM packing 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 Turntable motor with one (1) screw.
  • Page 28 R-203HW R-220HW R-230HW Re-install 3. Secure latch hook (with two (2) mounting screws) to 1. Re-install each switch in its place. The secondary oven flange. interlock/monitor switches are in the lower position and 4. Install the switch lever to the oven cavity the door sensing switch is in the upper position.
  • Page 29 R-203HW R-220HW R-230HW 5. Catch two (2) pins of door panel on two (2) hole of upper Upper Oven Hinge and lower oven hinges. 6. Re-install choke cover to door panel by pushing. Note: After any service to the door;...

  • Page 30: Control Panel Circuit

    NOTE: The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw. The screw must allways be kept tight. DOOR TEMPERATURE SENSING SWITCH FUSE (OVEN) POWER SUPPLY CORD OVEN LAMP 120V 60Hz N.O. CONTROL PANEL NOTE: The neutral (WHT) wire must be connected to the terminal with "N"...
  • Page 31 D1-D4 1N4002 POWER UNIT LIQUID CRYSTAL DISPLAY – – ON DEF. LBS QTY. CHECK 2SA1037AK - 5V R4 910 1/2w DTA143EAK AC(N) CN-A 0.1 /25v AC120V 0.1 /25v 60Hz OVEN LAMP RESET TEST TURNTABLE MOTOR OSC3 FAN MOTOR OSC4 SEG12 DTD143ES DTA143EAK SEG11...

  • Page 32: Printed Wiring Board

    R-203HW R-220HW R-230HW CHIP UNIT CN-B SIDE CODE (J1) Figure S-3. Printed Wiring Board PARTS LIST Note: The parts marked “ ” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO.

  • Page 33: Control Panel Parts

    FPNLCB702WRKZ Control panel frame with key unit [R-220HW] 3- 1 FPNLCB705WRKZ Control panel frame with key unit [R-203HW] 3- 1 FPNLCB713WRKZ Control panel frame with key unit [R-230HW] 3- 1-1 PSHEPA884WREZ Graphic sheet [R-220HW] 3- 1-1 PSHEPA887WREZ Graphic sheet [R-203HW]...
  • Page 34 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. Before attaching Control unit to Control CONTROL PANEL PARTS panel, foil side of Control unit must be cleaned by ethyl-alcohol.

  • Page 35: Oven And Cabinet Parts

    R-203HW R-220HW R-230HW OVEN AND CABINET PARTS 7-10 7-10 7-10 7-10 7-10 4-12 7-10 1-10 4-11 7-10 1-11 7-11 4-10 7-10...

  • Page 36: Packing And Accessories

    FPAK-A475WRKZ [R-220HW] FPAK-A476WRKZ [R-230HW] TRAY PAD ASSY (CPADBA296WRKZ) COPYRIGHT © 2003 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-...

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