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Sharp R-1200 Service Manual

Over the counter microwave oven
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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 ............................................................................................................................................ 11
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................ 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 23
PICTORIAL DIAGRAM ........................................................................................................................................ 30
POWER UNIT CIRCUIT ...................................................................................................................................... 31
LSI UNIT CIRCUIT ............................................................................................................................................... 32
PRINTED WIRING BOARD ................................................................................................................................. 33
PARTS LIST ........................................................................................................................................................ 34
PACKING AND ACCESSORIES ......................................................................................................................... 38
SERVICE MANUAL
OVER THE COUNTER
MICROWAVE OVEN
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 the following parts may result in a
severe, possibly fatal, electrical shock. (High Voltage Capaci-
tor, High Voltage Power Transformer, Magnetron, High Volt-
age Rectifier 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.
39
R-1200
R-1201
R-1200
R-1201
SY130R1200X//
Page

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Summary of Contents for Sharp R-1200

  • Page 1: Table Of Contents

    R-1200 R-1201 SERVICE MANUAL SY130R1200X// OVER THE COUNTER MICROWAVE OVEN R-1200 MODELS R-1201 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.

  • 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-1200 R-1201 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-1200 R-1201 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

    OVER THE COUNTER MICROWAVE OVEN R-1200/ R-1201 GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP OVER THE COUNTER MICROWAVE OVEN, R-1200 and R-1201. TROUBLESHOOTING GUIDE AND...

  • Page 6: Product Specifications

    R-1200 R-1201 PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14.1 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 23-7/8" Height 14-1/16" Depth 15- 9/16"...

  • Page 7: Oven Diagram

    R-1200 R-1201 Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using a grounded receptacle.

  • Page 8: Operation

    R-1200 R-1201 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 a closed position, the secondary interlock relay (RY2) and primary interlock OFF CONDITION switch open their contacts.
  • Page 9 R-1200 R-1201 SCHEMATIC NOTE: " " indicates components with potential above 250V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. CLOCK APPEARS ON DISPLAY. CAVITY MAGNETRON TEMPERATURE FUSE TEMPERATURE FUSE CONTROL UNIT N.O. COM. DOOR POWER SENSING FUSE TRANSFORMER SWITCH SECONDARY...
  • Page 10 R-1200 R-1201 DESCRIPTION AND FUNCTION OF COMPONENTS 3. If the door is opened, and the secondary interlock relay DOOR OPEN MECHANISM (RY2) and primary interlock switch contacts fail to open, The door is opened by pushing the open button on the the monitor fuse blows simultaneously with closing of the control panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-1200 R-1201 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 R-1200 R-1201 CK = Check / RE = Replace TEST PROCEDURE A B C D E F G H I J K L L L L M N RE RE RE RECK RE CK CK POSSIBLE CASE AND DEFECTIVE PARTS...

  • Page 13: Test Procedure

    R-1200 R-1201 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 14 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 15 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA- TURE, REPLACE TEMPERATURE FUSE.
  • Page 16 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit.
  • Page 17 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed.
  • Page 18 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER POWER MINUTE LEVEL PLUS STOP START CLEAR FROZEN FRESH FROZEN DEFROST TASK ACCENT VEGETABLES VEGETABLES ENTREES WATER CENTER LIGHT LIGHT REHEAT KEEP BAKED GROUND TIMER RICE POPCORN POTATOES MEAT CENTER WARM CLOCK RELAY TEST 1.
  • Page 19 R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Menu 1ST STAGE 2ND STAGE Steaks/Chops LEVEL TIME LEVEL TIME 0.5lbs 57sec. 17sec. (8) If improper operation is indicated, the control unit is probably defective and should be checked. 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 Assembly

    R-1200 R-1201 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8) Disconnect the power supply cord. 9) Open the door and block it open. 10) To discharge high voltage capacitor, wait for 60 seconds. 11) Reconnect all leads removed from components during testing.

  • Page 21: Description Of Lsi

    R-1200 R-1201 DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN4 Terminal to change cooking input according to the Model.
  • Page 22 R-1200 R-1201 Pin No. Signal Description Internal clock oscillation frequency input setting. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal. XOUT Internal clock oscillation frequency control output. Output to control oscillation input of XIN.
  • Page 23 R-1200 R-1201 Pin No. Signal Description 73/74 VCC/VREF Connected to GND. AVSS Connected to VC. COM3 Terminal not used. COM2 Common data signal: COM2. Connected to LCD signal COM2. COM1 Common data signal: COM1. Connected to LCD signal COM1. COM0 Common data signal: COM0.
  • Page 24 R-1200 R-1201 SERVICING 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). This unit uses CMOS LSI in the integral part of the 5) Re-connect the power supply cord after the outer case circuits. When handling these parts, the following pre- is installed.

  • Page 25: 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. Base cover, Base plate R, Oven cavity, Waveguide 1. Before wiring, flange, Chassis support and other metallic plate.
  • Page 26 R-1200 R-1201 cabinet) to the top cabinet. the oven. 5. While supporting the front of the oven, pull down the two 7. The oven is now free and can be placed on the work (2) mounting levers and release the oven from the unit surface selected for servicing the oven.
  • Page 27 R-1200 R-1201 10.Now, the high voltage rectifier assembly is free. 6. Disconnect high voltage wire A from capacitor. 11.Remove capacitor from the holder. 7. Remove the fan duct assembly from the oven cavity, 12.Now, the high voltage capacitor is free.
  • Page 28 R-1200 R-1201 6. Hold the fan duct to the magnetron with the one (1) screw. 8. Reinstall the wire leads to the hole of the fan duct. 7. Reconnect the wire leads to the fan motor, magnetron 9. Refer to procedure of "OUTER CASE REMOVAL". And and high voltage capacitor, referring to the pictorial reverse their procedure.
  • Page 29 R-1200 R-1201 RIGHT PANEL ASSEMBLY AND POWER UNIT REMOVAL 7. Disconnect the connectors CN-A, CN-B and CN-C from 1. Disconnect the power supply cord. the control unit. 2. Open the door and block it open. 8. Remove the right panel assembly from the oven.

  • Page 30: Door Replacement

    R-1200 R-1201 DOOR REPLACEMENT DOOR ASSEMBLY REMOVAL chapter "Test Procedures".) 1. Disconnect the power supply cord and remove the oven (B) An approved microwave survey meter should be from wall and remove outer case. (Refer to procedure of used to assure compliance with proper microwave "Removal of Oven from Wall"...

  • Page 31: Door Disassembly

    R-1200 R-1201 DOOR DISASSEMBLY 12.Releasing the two (2) lower tabs, remove the LSI unit 1. Disconnect the power supply cord. with the LCD holder from the door frame assembly. 2. Open the door and block it open. 13.Disconnect the 9-pin wire harness from the LSI unit.

  • Page 32: Pictorial Diagram

    R-1200 R-1201...

  • Page 33: Power Unit Circuit

    R-1200 R-1201 D1-D4 1N4002 CN-C – 240 1w 240 1w – AC(N) 10 /35v OVEN LAMP TURNTABLE OVEN LAMP MOTOR TURNTABLE FAN MOTOR MOTOR FAN MOTOR KRC243M AC(H) BUZZER MICRO MICRO KRA101M HOOD LAMP HOOD LAMP HOOD COMMON LAMP HOOD...

  • Page 34: Lsi Unit Circuit

    R-1200 R-1201 SEG21 SEG21 SEG20 SEG20 SEG19 SEG19 SEG18 SEG18 SEG17 SEG17 SEG16 SEG16 SEG15 SEG15 SEG14 SEG14 SEG13 SEG13 SEG12 SEG12 SEG11 SEG11 SEG10 SEG10 SEG9 SEG9 SEG8 SEG8 SEG7 SEG7 SEG6 SEG6 SEG5 SEG5 SEG4 SEG4 SEG3 SEG3...

  • Page 35: Printed Wiring Board

    R-1200 R-1201 CN - F IC-1 VRS1 Figure S-4. Printed Wiring Board...

  • Page 36: Parts List

    Outer case cabinet [R-1200] 2- 3 GCABUB109MRP0 Outer case cabinet [R-1201] 2- 4 TMAPCB068MRR0 Schematic diagram 2- 5 FANGKB009MRY0 Hood lamp glass assembly [R-1200] 2- 5 FANGKB010MRY0 Hood lamp glass assembly [R-1201] 2-5-1 LANGQB016MRP0 Hood lamp glass angle [R-1200] 2-5-1 LANGQB020MRP0...

  • Page 37: Door Parts

    Revised DHHS/GRD C/label SCREWS, NUTS AND WASHERS 7- 1 XOPSD40P12000 Screw : 4mm x 12mm 7- 2 XOTSF40P12000 Screw : 4mm x 12mm [R-1200] 7- 2 XOTSE40P12000 Screw : 4mm x 12mm [R-1201] 7- 3 XOTSD40P12000 Screw : 4mm x 12mm...
  • Page 38 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. RIGHT PANEL PARTS 4-18 4-19...
  • Page 39 R-1200 R-1201 OVEN AND CABINET PARTS 4-10 1-12 4-12 4-17 4-16 4-17 4-13 6-10 4-16 4-20 4-13 4-11 4-21 4-15 1-10 1-14 1-13 1-11 1-10 1-11 1-13 4-22 4-23 1-14 5-2-4 4-24 2-5-2 4-14 2-5-1...

  • Page 40: Packing And Accessories

    No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permis- sion of the publisher. '01 SHARP CORP. (12S1.730E) Printed in U.S.A...

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