Sharp R-320HK Service Manual
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Sharp R-320HK Service Manual

Sharp R-320HK Service Manual

Sharp microwave oven service manual
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See also: Operating Manual
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 ............................................................................................................................ 10
TEST PROCEDURE ............................................................................................................................................ 11
TOUCH CONTROL PANEL ................................................................................................................................. 20
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 25
PICTORIAL DIAGRAM ........................................................................................................................................ 31
CONTROL UNIT CIRCUIT .................................................................................................................................. 32
PRINTED WIRING BOARD ................................................................................................................................. 33
PARTS LIST ........................................................................................................................................................ 34
PACKING AND ACCESSORIES ......................................................................................................................... 38
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.
39
MICROWAVE OVEN
R-320HK
R-320HQ
R-320HW
R-320HK
R-320HQ
R-320HW
S4309R320HPW/
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  • Page 1: Table Of Contents

    R-320HK R-320HQ R-320HW SERVICE MANUAL S4309R320HPW/ MICROWAVE OVEN R-320HK MODELS R-320HQ R-320HW 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-...

  • 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-320HK R-320HQ R-320HW 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-320HK R-320HQ R-320HW 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-320HK/ R-320HQ/ R-320HW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS,R-320HK,R-320HQ and R-320HW. OPERATION It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.

  • Page 6: Product Specifications

    R-320HK R-320HQ R-320HW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14.2 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 12-1/4" Depth 17-1/4" Cooking Cavity Dimensions Width 14-3/4"...
  • Page 7 R-320HK R-320HQ R-320HW contact a qualified electrician and have it replaced with a properly Grounded Receptacle Box 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...

  • Page 8: Operation

    R-320HK R-320HQ R-320HW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during the secondary interlock switch and primary interlock oven operation. relay and is mechanically associated with the door so that it will function in the following sequence.
  • Page 9 R-320HK R-320HQ R-320HW supplementary cooking is started. The time of supplemen- tary cooking is determined by experiment with each food category and inputted into the LSI. An example of how sensor works: (POTATOES) 1. Potates at room temperature. Vapor is emitted very slowly.
  • Page 10 R-320HK R-320HQ R-320HW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY AH SENSOR C/T FUSE TEMPERATURE POWER FUSE 150˚C (OVEN) TRANSFORMER N.O. PRIMARY CAPACITOR INTERLOCK RELAY...
  • Page 11 R-320HK R-320HQ R-320HW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the C/T 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 C/T FUSE, control panel, refer to the Figure D-1.

  • Page 12: Troubleshooting Guide

    R-320HK R-320HQ R-320HW 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 13: Test Procedure

    R-320HK R-320HQ R-320HW CK = Check / RE = Replace RE RE A B C D E F F G H RE RE CK I CK CK CK J K L M N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows...
  • Page 14 R-320HK R-320HQ R-320HW 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 15 R-320HK R-320HQ R-320HW 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. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
  • Page 16 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PRIMARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor.
  • Page 17 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: BEFORE REPLACING A BLOWN C/T FUSE, TEST THE PRIMARY INTERLOCK RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. If the C/T fuse is blown by improper switch operation, the C/T fuse and monitor switch must be replaced with "C/T fuse and monitor switch assembly"...
  • Page 18 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3. If the Key unit or the Control unit is defective. 1) Disconnect the power supply cord, and then remove outer case. 2) Open the door and block it open. 3) Discharge high voltage capacitor.
  • Page 19 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RY1 and RY2 Relay Test These relays are operated by D.C. voltage Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ....Defective relay.
  • Page 20 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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) Disconnect the leads to the primary of the power transformer.
  • Page 21 R-320HK R-320HQ R-320HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect the power supply cord, and then remove outer case.

  • Page 22: Touch Control Panel

    R-320HK R-320HQ R-320HW 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...
  • Page 23 R-320HK R-320HQ R-320HW Pin No. Signal Description AH sensor input. This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI. Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
  • Page 24 R-320HK R-320HQ R-320HW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47 and AN3 terminal while one of G8 line keys on key matrix is touched.
  • Page 25 R-320HK R-320HQ R-320HW Pin No. Signal Description COM0 Common data signal. Connected to LCD signal COM1. Power source voltage input terminal. Standard voltage for LCD. Connected to GND. ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor observes the initial voltage available at its AN1 terminal.
  • Page 26 R-320HK R-320HQ R-320HW 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 27: Component Replacement And Adjustment Procedure

    3. If the door is not closed. exist; 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 and 1. Before wiring, other metallic plate.
  • Page 28 R-320HK R-320HQ R-320HW 6. Lift entire outer case from the unit. 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. NOTE: When replacing the outer case, the 2 special...
  • Page 29 R-320HK R-320HQ R-320HW ® POSITIVE LOCK CONNECTOR (NO-CASE TYPE) REMOVAL Terminal 1. Disconnect the power supply cord, and then remove outer case. Positive lock® 2. Open the door and block it open. connector 3. Discharge high voltage capacitor. 4. Push the lever of positive lock ®...
  • Page 30 7. Now the turntable motor is free. 4. Where the corners have been snipped off bend corner 8. After replacement use the one (1) screw to fit the turntable areas flat. No sharp edges must be evident after removal motor cover. of the turntable motor cover.
  • Page 31 R-320HK R-320HQ R-320HW 2. Reconnect wire leads to each switch. 4. Make sure that the monitor switch is operating properly Refer to pictorial diagram. and check continuity of the monitor circuit. Refer to 3. Secure latch hook (with two (2) mounting screws) to chapter "Test Procedure"...
  • Page 32 R-320HK R-320HQ R-320HW 14.Now, latch head and latch spring are free. 15.Remove door screen from door frame. 16.Now, door screen is free. Upper Oven Upper REINSTALLATION Hinge Oven Hinge 1. Reinstall door screen to door frame . 2. Reinstall the latch spring to the latch head. Reinstall the latch spring to the door frame.

  • Page 33: Pictorial Diagram

    R-320HK R-320HQ R-320HW...

  • Page 34: Control Unit Circuit

    R-320HK R-320HQ R-320HW...

  • Page 35: Printed Wiring Board

    R-320HK R-320HQ R-320HW CHIP SIDE CN-F 1 2 3 CN-B WH-2 WH-2 Q4 SP1 VRS1 Figure S-3. Printed Wiring Board of Power Unit...

  • Page 36: Parts List

    Magnetron 1-11 RV-MZA320WRZZ Magnetron (Interchangeable) 1-12 FDTCTA230WRKZ AH sensor assembly CABINET PARTS GCABUA883WRPZ Outer case cabinet [R-320HW] GCABUA889WRPZ Outer case cabinet [R-320HK] GCABUA894WRPZ Outer case cabinet [R-320HQ] FDAI-A265WRYZ Bottom plate GLEGPA074WRE0 Foot CONTROL PANEL PARTS CPWBFA862WRKZ Control unit assembly HPNLCB787WRRZ...
  • Page 37 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 38 R-320HK R-320HQ R-320HW 7-10 OVEN AND CABINET PARTS 7-10 7-10 4-15 7-11 7-12 4-16 1-12 4-13 7-10 7-10 7-10 4-14 4-12 1-11 4-17 4-10 1-10 4-11 4-12 4-12 7-10 7-10 4-12 7-10 7-10...
  • Page 39 R-320HK R-320HQ R-320HW CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration.

  • 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 permission of the publisher. 2003 SHARP CORP. (4S1.700E) Printed in U.S.A...

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