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Sharp R-305CW Supplemental Service Manual

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SUPPLEMENTAL SERVICE MANUAL
This is a supplemental Service Manual for Model R-305CW. 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
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 7
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.
TO ADJUST QUANTITY
TOUCH PAD AGAIN
Casserole
Beverage
Popcorn
Baked
Fresh
Rolls/
Potatoes
Vegetables
Muffins
In the interest of user-safety the oven should be restored to its original
1 Ground Meat
2 Steaks/Chops
3 Chicken Pieces
condition and only parts identical to those specified should be used.
1
2
3
4
5
6
7
8
9
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
Power
0
Timer
Level
Clock
Stop
START
Clear
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-305CW
MODEL
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-305CW
S2903R305CPW/
Page

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Summary of Contents for Sharp R-305CW

  • 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-305CW. 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-305CW 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-305CW FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-305CW. The model R-305CW is quite similar to base model R-308CW (Refer No. is S1901R310CPW/).

  • Page 5: Product Specifications

    R-305CW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 12.5 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 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-305CW TOUCH CONTROL PANEL LBS. CUPS. COOK DEFOST TO ADJUST QUANTITY TOUCH PAD AGAIN Casserole Popcorn Beverage Baked Fresh Rolls/ Potatoes Vegetables Muffins 1 Ground Meat 2 Steaks/Chops 3 Chicken Pieces Power Timer Level Clock Stop START Clear SCHEMATIC NOTE: CONDITION OF OVEN 1.

  • Page 7: Test Procedure

    R-305CW 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 8 R-305CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

  • Page 9: Component Replacement And Adjustment Procedure

    R-305CW COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE MAGNETRON REMOVAL Removal Re-install 1. Disconnect the power supply cord and then remove 1. Re-install the magnetron to waveguide flange with the outer case. four (4) screws. 2. Open the door and block it open.

  • Page 10: Cpu Unit Circuit

    R-305CW 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-305CW 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-305CW 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-305CW OVEN AND CABINET PARTS 4-13 4-10 1-10 4-17 1-11 4-18 4-12 1-13 4-15 4-14 4-11 1-12 1-14 4-16...
  • Page 15 R-305CW 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. (1S2.530E) Printed in U.S.A...

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