Sharp R-501CK Service Manual
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Sharp R-501CK Service Manual

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R-501CW
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
POWER UNIT CIRCUIT ....................................................................................................................................... 29
LSI UNIT CIRCUIT ............................................................................................................................................... 30
PRINTED WIRING BOARD ................................................................................................................................. 31
PARTS LIST ........................................................................................................................................................ 32
PACKING AND ACCESSORIES ......................................................................................................................... 36
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.
S110M153R501CE
MICROWAVE OVEN
R-501CK
R-501CW
R- 50 1CK
R-501CW
Page

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Summary of Contents for Sharp R-501CK

  • Page 1: Table Of Contents

    R- 50 1CK R-501CW SERVICE MANUAL S110M153R501CE MICROWAVE OVEN R-501CK MODELS R-501CW 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. R-501CW 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-501CK R-501CW 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 - 5 0 1 C K R- 501CW 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 by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm at any point 5cm or more from the external surface of the oven.

  • Page 5: Foreword And Warning

    MICROWAVE OVEN R-501CK/ R-501CW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICRO- OPERATION WAVE OVEN, R-501CK and R-501CW. It is recommended that service personnel carefully study the entire text of...

  • Page 6: Product Specifications

    R - 5 0 1 C K R- 501CW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.0 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 24"...

  • Page 7: Oven Diagram

    R-501CK R-501CW contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop or table where it can be pulled on by children or tripped over accidentally.

  • Page 8: Operation

    R - 5 0 1 C K R- 501CW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay and is mechanically associated with the door so oven operation. that it will function in the following sequence. (1) When the door opens from the closed position, the OFF CONDITION primary interlock relay (RY2) and secondary interlock...

  • Page 9: Oven Schematic-Off Condition

    R-501CK R-501CW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: Indicates components with potential above 250 V. MAGNETRON MONITOR TEMP. FUSE 20A FUSE COM. N.O. CAPACITOR 1.0µF AC 2300V (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CONTROL UNIT N.O.

  • Page 10: Description And Function Of Components

    R - 5 0 1 C K R- 501CW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the monitor 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 MONITOR control panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-501CK R-501CW 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 - 5 0 1 C K R- 501CW CK = Check / RE = Replace RE RE A B C D E E F F G H RE RE CK I CK CK CK J K L M TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows...
  • Page 13 R-501CK R-501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
  • Page 14 R - 5 0 1 C K R- 501CW 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.
  • Page 15 R-501CK R-501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA- TURE, REPLACE TEMPERATURE FUSE. SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open.
  • Page 16 R - 5 0 1 C K R- 501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8.
  • Page 17 R-501CK R-501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal. If the Key unit is defective. 1) Disconnect the power supply cord, and then remove outer case.
  • Page 18 R - 5 0 1 C K R- 501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8. Run the oven and check all functions. RELAY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3.
  • Page 19 R-501CK R-501CW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (6) 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

    R - 5 0 1 C K R- 501CW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The touch control section consists of the following units. This circuit generates voltages necessary in the control unit from the AC line voltage. (1) Key Unit In addition, the synchronizing signal is available in order (2) Control Unit (The Control Unit consists of Power Unit and...
  • Page 21 R-501CK R-501CW Pin No. Signal Description Back light circuit (Light emitting diodes) driving signal. 12-13 P56-P55 Terminal not used. CNTR0 Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. L : -5V 2.0 sec.
  • Page 22 R - 5 0 1 C K R- 501CW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45 terminal while one of G8 line keys on key matrix is touched. Key strobe signal.
  • Page 23 R-501CK R-501CW TOUCH CONTROL PANEL SERVICING repair all the controls (sensor-related ones included) of 1. Precautions for Handling Electronic Components the touch control panel while keeping it connected to the This unit uses CMOS LSI in the integral part of the oven.

  • 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: Magnetron Removal

    R-501CK R-501CW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. Special screw NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.
  • Page 26 4. Where the corners have been snipped off bend corner 7. Now the turntable motor is free. areas flat. No sharp edges must be evident after removal 8. After replacement use the one (1) screw to fit the of the turntable motor cover.
  • Page 27 R-501CK R-501CW COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove * Do not reuse the removed fan blade because the outer case. hole (for shaft) may be larger than normal. 2. Open the door and block it open.
  • Page 28 R - 5 0 1 C K R- 501CW forth, and up and down. In and out play of the door 3. Monitor switch contacts close when door is opened. allowed by the upper and lower position of the latch hook 4.
  • Page 29 R-501CK R-501CW Note: The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle. This function does not require that door be air- tight, moisture (condensation)-tight or light-tight.

  • Page 30: Pictorial Diagram

    NOTE: The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw. CAVITY TEMP. FUSE The screw must always be MAGNETRON TEMP. FUSE kept tight. DOOR N.O. SENSING CONTROL UNIT SWITCH POWER SUPPLY COM. CORD 120V 60Hz to Oven cavity (LSI UNIT)

  • Page 31: Power Unit Circuit

    R-501CK R-501CW 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 SENSING SWITCH SH-B DOOR...

  • Page 32: Lsi Unit Circuit

    LIQUID CRYSTAL DISPLAY LSI UNIT LBS. CUPS COOK DEFROST AUTO R3 4.7k – LD1 LD2 LD3 LD4 2SA1037AK 2SA1037AK R4 560 1/2w (J10) (J11) 4.7k (J12) (J13) 4.7k (J14) (J15) 4.7k DTA143EKA (J16) (J17) 4.7k SEG8 SEG9 SEG10 SEG11 BUZZER SEG12 SEG13 SEG14...

  • Page 33: Printed Wiring Board

    R-501CK R-501CW QKITPB034MRE0 CN-C CN-B MICRO OL TTM FM VRS1 CN-A Figure S-5 . Printed Wiring Board of Power Unit Figure S-5 . Printed Wiring Board of Power Unit Figure S-5 . Printed Wiring Board of Power Unit Figure S-5 . Printed Wiring Board of Power Unit...

  • Page 34: Parts List

    Transformer (Interchangeable) VRS1 RH-VZB001MRE0 Varistor (470ND-10D) VRS1 RH-VZA032DRE0 Varistor (10G471K) (Interchangeable) 3- 2 FPNLCB332MRK0 Control panel frame with key unit [R-501CK] 3- 2 FPNLCB333MRK0 Control panel frame with key unit [R-501CW] 3- 2-1 FUNTKB276MRE0 Key unit [R-501CK] 3- 2-1 FUNTKB277MRE0...
  • Page 35 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 36: Oven And Cabinet Parts

    R - 5 0 1 C K R- 501CW OVEN AND CABINET PARTS 7-10 7-10 1-10 1-14 1-11 4-10 1-12 1-13 7-11 4-13 4-12 4-11...
  • Page 37 R-501CK R-501CW CONTROL PANEL PARTS 3-2-1 3-2-2 DOOR PARTS 3-2-3 5-1-1 MISCELLANEOUS 5-1-2 Actual wire harness may be different from illustration.

  • Page 38: Packing And Accessories

    R - 5 0 1 C K R- 501CW PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET PLASTIC BAG TRAY HOLDER 6-5 TURNTABLE TRAY 6-8 OPERATION MANUAL 6-4 TURNTABLE SUPPORT BOTTOM PAD ASSEMBLY TRAY PACK PACKING CASE...
  • Page 39 R-501CK R-501CW Notes:...
  • Page 40 No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, me- chanical, photocopying, recording, or other- wise, without prior written permission of the publisher. '00 SHARP CORP. (11M3187E) Printed in U.S.A...

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