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Sharp R-320DK Service Manual

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R-320DW
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 ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 27
PICTORIAL DIAGRAM ........................................................................................................................................ 33
POWER UNIT CIRCUIT ...................................................................................................................................... 34
CPU UNIT CIRCUIT ............................................................................................................................................ 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 41
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.
MICROWAVE OVEN
R-320DK
R-320DQ
R-320DW
R - 320DK
R -3 20DQ
R -320DW
S1002R320DPW/
Page

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  • Page 1: Table Of Contents

    R - 320DK R -3 20DQ R -320DW SERVICE MANUAL S1002R320DPW/ MICROWAVE OVEN R-320DK MODELS R-320DQ R-320DW 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.

  • 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 -320DK R -320DQ R-320DW 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- 320DK R-3 20DQ R-320DW 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-320DK/ R-320DQ/ R-320DW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-320DK, R-320DQ, R-320DW. 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- 320DK R-3 20DQ R-320DW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1150 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 11-7/8" Depth 17-1/8" Cooking Cavity Dimensions Width 14-3/4"...

  • Page 7: Oven Diagram

    R -320DK R -320DQ R-320DW contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter Grounded 3-Pronged Plug Receptacle Box properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp.

  • Page 8: Operation

    (Figure O-1). (RY2) fail with the contacts closed when the door is opened, 1. The display will show "SHARP SIMPLY THE BEST the closing of the monitor switch contacts will form a short PRESS CLEAR AND PRESS CLOCK".To set any...
  • Page 9 R -320DK R -320DQ R-320DW Cooking Sequence. 1. Touch one of the SENSOR pads. NOTE: The oven should not be operated on SENSOR immediately after plugging in the unit. Wait two minutes before cooking on SENSOR. 1. Potates at room temperature. Vapor is emitted very 2.
  • Page 10 R- 320DK R-3 20DQ R-320DW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) N.O. POWER N.O. TRANSFORMER (RY-1) (RY-2) PRIMARY INTERLOCK RELAY CONTROL UNIT COM. COM. SH-B SH-A 120V AC...
  • Page 11 R -320DK R -320DQ R-320DW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, The door is opened by pulling the door. Refer to the Figure PRIMARY INTERLOCK RELAY (RY2), RELAY D-1.

  • Page 12: Troubleshooting Guide

    R- 320DK R-3 20DQ R-320DW 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 -320DK R -320DQ R-320DW 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 when power cord is plugged into wall receptacle Monitor fuse blows when power cord...
  • Page 14 R- 320DK R-3 20DQ R-320DW 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 -320DK R -320DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.) HIGH VOLTAGE RECTIFIER TEST 1.
  • Page 16 R- 320DK R-3 20DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fan air guide. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7.
  • Page 17 R -320DK R -320DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER as follows. When the door is open, the meter should indicate a closed circuit. 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 18 R- 320DK R-3 20DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2) Reconnect all leads removed from components during testing. 3) Re-install the outer case (cabinet). 4) Reconnect the power supply cord after the outer case is installed. 5) Run the oven and check all functions. The following symptoms indicate a defective key unit.
  • Page 19 R -320DK R -320DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
  • Page 20 R- 320DK R-3 20DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (3) The oven is in Compu Defrost cooking condition. (4) The oven will operate as follows 1ST STAGE 2ND STAGE WEIGHT LEVEL TIME LEVEL TIME 0.5lb 40sec. 30sec. (5) 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 21 R -320DK R -320DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 10) Discharge high voltage capacitor. 11) Reconnect all leads removed from components during testing. 12) Re-install the outer case (cabinet). 13) Reconnect the power supply cord after the outer case is installed. 14) Run the oven and check all functions.
  • Page 22 R- 320DK R-3 20DQ R-320DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9-3. Close the door. 9-4. Touch REHEAT SENSOR pad once. 9-5. The control panel is in automatic Sensor operation. 9-6. The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (bubbling).

  • Page 23: Touch Control Panel

    R -320DK R -320DQ R-320DW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 4) Relay Circuit The touch control section consists of the following units. A circuit to drive the magnetron, fan motor, turntable motor and light the oven lamp. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit 5) Buzzer Circuit...
  • Page 24 R- 320DK R-3 20DQ R-320DW LSI(IXA020DR) The I/O signal of the LSI(IXA020DR) is detailed in the following table. Pin No. Signal Description P26-P27 Terminal not used. P70-P72 Terminal not used. Connected to VC. Internal clock oscillation output. Output to control oscillation input to X2. Internal clock oscillation frequency control input setting.
  • Page 25 R -320DK R -320DQ R-320DW Pin No. Signal Description P114 Key strobe signal. Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102 and P103 terminal while one of G4 line keys on key matrix is touched. P115 Key strobe signal.
  • Page 26 R- 320DK R-3 20DQ R-320DW Pin No. Signal Description Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. L : -5V B: Completion sound. 2.0 sec. H : GND L : -5V To input signal which communicates the door open/close information to LSI. Door close "H"...
  • Page 27 R -320DK R -320DQ R-320DW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor food is heated to generate moisture by which the The absolute humidity sensor includes two thermistors resistance balance of the bridge circuit is deviated to as shown in the illustration.
  • Page 28 R- 320DK R-3 20DQ R-320DW TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the touch control panel and the oven itself is so short that the This unit uses CMOS LSI in the integral part of the two can’t be separated.

  • Page 29: Component Replacement And Adjustment Procedure

    WARNING FOR WIRING To prevent an electric shock, take the following pre- and Oven cavity. cautions. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange, 1) Disconnect the power supply cord. Chassis support and other metallic plate.
  • Page 30 R- 320DK R-3 20DQ R-320DW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE. Torx screws must be reinstalled in the same 2. DISCHARGE THE HIGH VOLTAGE CA- locations.
  • Page 31 R -320DK R -320DQ R-320DW from magnetron. oven cavity front flang, magnetron and the fan duct with 12.Now, the magnetron is free. the four (4) screws. Re-install 5. Reconnect the wire leads to the magnetron and thermal 1. Re-install the magnetron duct with thermal cut-out (MG) cut-out (MG).
  • Page 32 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 33 R -320DK R -320DQ R-320DW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1. Disconnect the power supply cord and remove outer case. 1. Re-install each switch in its place. The secondary 2. Open the door and block it open. interlock/monitor switches are in the lower position and 3.
  • Page 34 R- 320DK R-3 20DQ R-320DW 11.Now, door panel with sealer film is free. 12.Tear sealer film from door panel. 13.Now, door panel is free. 14.Slide latch head upward and remove it from door frame Upper Oven Upper Hinge with releasing latch spring from door frame and latch Oven Hinge head.

  • Page 35: Pictorial Diagram

    R -320DK R -320DQ R-320DW RECTIFIER H.V.

  • Page 36: Power Unit Circuit

    R- 320DK R-3 20DQ R-320DW S1NB10 CN-A – OVEN LAMP FAN MOTOR BUZZER TURNTABLE MOTOR OVEN LAMP FAN MOTOR TURNTABLE MOTOR (CN-D) MICRO MICRO DOOR SENSING SWITCH SH-A SH-B CN-C (CN-B) 12PIN LEAD WIRE DOOR SENSING HARNESS SWITCH...

  • Page 37: Cpu Unit Circuit

    R -320DK R -320DQ R-320DW COM2 COM0 ANI2 COM1 ANI1 COM1 COM2 COM0 ANI0 SEG0 COM3 AVSS SEG1 BIAS P117 SEG2 VLC0 P116 SEG3 VLC1 P115 SEG4 VLC2 P114 SEG5 VSS0 P113 SEG6 P112 SEG0 SEG7 P111 SEG8 P110 SEG9 SEG10 SEG11 SEG12...

  • Page 38: Printed Wiring Board

    R- 320DK R-3 20DQ R-320DW (RED) (GREEN) CN - C SH - B SH - A B R1 (CN - B) (J2) (D10) (J1) CN - A Figure S-5. Printed Wiring Board of Power Unit...

  • Page 39: Parts List

    RH-VZA032DRE0 Varistor (10G471K) 3- 2 DPWBFC023WRKZ CPU unit 3- 3 FPNLCB484WRKZ Control panel frame with key unit [R-320DK] 3- 3 FPNLCB486WRKZ Control panel frame with key unit [R-320DW] 3- 3 FPNLCB487WRKZ Control panel frame with key unit [R-320DQ] 3- 3-1...
  • Page 40 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 41 R - 320DK R -3 20DQ R -320DW OVEN AND CABINET PARTS 4-23 4-25 4-22 1-15 1-10 4-17 1-11 1-13 4-20 4-13 4-24 4-23 4-11 4-19 4-10 4-20 4-22 4-12 4-21 4-15 4-14 4-18 1-12 1-14 4-16 4-15...
  • Page 42 R -3 20DK R -3 20DQ R-320DW CONTROL PANEL PARTS 3-3-1 DOOR PARTS MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    PLASTIC BAG SSAKHA034WRE0 6- 8 INSTRUCTION BOOK & PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY FPADBA417WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE SPADFA451WRE0 OVEN CAVITY Not replaceable items. PACKING CASE SPAKCD351WREZ [R-320DK] SPAKCD357WREZ [R-320DW] SPAKCD358WREZ [R-320DQ]...
  • Page 44 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. 20' SHARP CORP. (1S2.530E) Printed in U.S.A...

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