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Sharp R-318BK Service Manual

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SUPPLEMENTAL SERVICE MANUAL
This is a supplemental Service Manual for Model R-318BK. This model is quite similar to base
model R-320BK. Use this supplemental manual together with the Base Model Service Manual
(Refer No. is S2805R320BPW/) for complete operation, service information, etc..
BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING ............................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
SCHEMATIC DIAGRAM ........................................................................................................................................ 5
TEST PROCEDURE .............................................................................................................................................. 6
POWER UNIT CIRCUIT ........................................................................................................................................ 7
CPU UNIT CIRCUIT .............................................................................................................................................. 8
PRINTED WIRING BOARD ................................................................................................................................... 9
PARTS LIST ........................................................................................................................................................ 10
PACKING AND ACCESSORIES ......................................................................................................................... 14
SHARP CORPORATION
S E N S O R C O O K
BAKED
POPCORN
REHEAT
POTATO
FRESH VEGETABLE
FROZEN ENTREES
INSTANT ACTION
In the interest of user-safety the oven should be restored to its original
TO ADJUST QUANTITY . TOUCH
PAD AGAIN
GROUND
FRESH/
CHICKEN
MEAT
SEAFOOD
BREAST
FRESH ROLL
FROZEN ROLL
condition and only parts identical to those specified should be used.
COMPU DEFROST
GROUND
STEAKS/
CHICKEN
MEAT
CHOPS
PIECES
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
KITCHEN
AUTO START
MINUTE
TIMER
CLOCK
PLUS
tain circuitry capable of producing very high voltage and
POWER
STOP
LEVEL
CLEAR
START
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-318BK
MODEL
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-318BK
S915R318BPK/
Page

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Summary of Contents for Sharp R-318BK

  • 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-318BK. This model is quite similar to base model R-320BK. 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-318BK 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-318BK 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-318BK FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-318BK. The model R-318BK is quite similar to base model R-320BK (Refer No. is S2805R320BPW/).

  • Page 6: Product Specifications

    R-318BK SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 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 15-7/8" Cooking Cavity Dimensions Width 13-3/4"...

  • Page 7: Schematic Diagram

    R-318BK TOUCH CONTROL PANEL S E N S O R C O O K BAKED POPCORN REHEAT POTATO FRESH VEGETABLES FROZEN ENTREES I N S T A N T A C T I O N TO ADJUST QUANTITY . TOUCH PAD AGAIN...

  • Page 8: Test Procedure

    R-318BK 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 9: Power Unit Circuit

    R-318BK 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 (stop 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...

  • Page 10: Cpu Unit Circuit

    R-318BK...

  • Page 11: Printed Wiring Board

    R-318BK WH - 1 (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-4. Printed Wiring Board of Power Unit...

  • Page 12: Parts List

    R-318BK 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 2nd interlock switch / door sensing switch...
  • Page 13 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 14 R-318BK OVEN AND CABINET PARTS 1-11 1-10 4-17 4-20 1-15 1-13 4-16 4-10 4-21 4-22 4-15 4-12 4-14 1-12 4-23 4-11 4-19 1-14 4-13...
  • Page 15 R-318BK 3 - 5 CONTROL PANEL PARTS 3-1F 3 - 4 3 - 2 3 - 5 3 - 3 3-3-1 3 - 5 DOOR PARTS 3 - 1 3-3-3 3-3- 2 4-18 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.

  • Page 16: Packing And Accessories

    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. '98 SHARP CORP. (9S2.530E) Printed in U.S.A...

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