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SUPPLEMENTAL SERVICE MANUAL
This is a supplemental Service Manual for Model R-303CW. This model is quite similar to base
model R-308CW. Use this supplemental manual together with the Base Model Service Manual
(Refer No. is S1901R310CPW/) for complete operation, service information, etc..
BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
FOREWORD AND WARNING ............................................................................................................................... 2
PRODUCT SPECIFICATIONS .............................................................................................................................. 3
SCHEMATIC DIAGRAM ........................................................................................................................................ 4
TEST PROCEDURE .............................................................................................................................................. 5
POWER UNIT CIRCUIT ........................................................................................................................................ 7
CPU UNIT CIRCUIT .............................................................................................................................................. 8
PRINTED WIRING BOARD ................................................................................................................................... 9
PARTS LIST ........................................................................................................................................................ 10
PACKING AND ACCESSORIES ......................................................................................................................... 11
SHARP CORPORATION
NO.
LBS.
CUPS.
COOK
DEFOST
OZ.
MINUTE
PLUS
INSTANT ACTION
TO ADJUST QUANTITY - TOUCH PAD
AGAIN
Dinner
Casserole
Popcorn
Plate
Baked
Fresh
Beverage
Potatoes
Vegetables
Frozen
Frozen
Rolls/
Entress
Vegetabl es
Muffins
In the interest of user-safety the oven should be restored to its original
1 Ground Meat
2 Steaks/Ch ops
COMPU
DEFROST
3 Chicken Pieces
1
2
3
condition and only parts identical to those specified should be used.
4
5
6
7
8
9
Power
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
Level
0
Timer
Clock
Stop
Clear
STAR T
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..)

TABLE OF CONTENTS

MICROWAVE OVEN
R-303CW
MODEL
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-303CW
S3905R303CPW/
Page

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Summary of Contents for Sharp R-303CW

  • Page 1: Table Of Contents

    Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..) This is a supplemental Service Manual for Model R-303CW. This model is quite similar to base model R-308CW. Use this supplemental manual together with the Base Model Service Manual (Refer No.
  • 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 The Food and Drug Administration's Center for Devices and Radiological Health immediately.
  • Page 3: Warning To Service Personnel

    R-303CW 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: Foreword And Warning

    MICROWAVE OVEN R-303CW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-303CW. The model R-303CW is quite similar to base model R-308CW (Refer No. is S1901R310CPW/).
  • Page 5: Product Specifications

    R-303CW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 16-7/8" Cooking Cavity Dimensions Width 14-3/4"...
  • Page 6: Schematic Diagram

    R-303CW TOUCH CONTROL PANEL LBS. CUPS. COOK DEFOST MINUTE PLUS INSTANT ACTION TO ADJUST QUANTITY - TOUCH PAD AGAIN Dinner Casserole Popcorn Plate Baked Fresh Beverage Potatoes Vegetables Frozen Frozen Rolls/ Entress Vegetables Muffins 1 Ground Meat COMPU 2 Steaks/Chops...
  • Page 7: Test Procedure

    R-303CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 8 R-303CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 9: Power Unit Circuit

    R-303CW CN-C S1NB10 9PIN LEAD WIRE HARNESS CN-A – OVEN LAMP TURNTABLE BUZZER MOTOR FAN MOTOR OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICRO MICRO (BROWNER) SH-A DOOR SWITCH SH-B DOOR...
  • Page 10: Cpu Unit Circuit

    R-303CW COM1 COM2 COM3 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VREF XOUT AVSS COM3 COM2 COM1 RESET COM0 4.7k 4.7k 4.7k /25v 0.01 UDZ4.3B 270k...
  • Page 11: Printed Wiring Board

    R-303CW SW (GREEN) CN - C SH - B SH - A CN - B (D3) (D4) TTM FM BROWNER MICRO Figure S-4. Printed Wiring Board of Power Unit...
  • Page 12: Parts List

    R-303CW 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-MA137WRE0 2nd interlock switch / door sensing switch...
  • Page 13: Packing And Accessories

    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. TOP PAD ASSEMBLY PACKING AND ACCESSORIES...
  • Page 14 R-303CW OVEN AND CABINET PARTS 4-13 4-10 1-10 4-17 1-11 4-19 4-20 6-10 4-18 4-12 1-13 4-15 4-14 4-11 1-12 1-14 4-16...
  • Page 15 R-303CW CONTROL PANEL PARTS DOOR PARTS 3-3-1 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.
  • Page 16 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. '99 SHARP CORP. (3S2.530E) Printed in U.S.A...

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