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Sharp R-320FK Service Manual

Service manual
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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 ............................................................................................................................ 10
TEST PROCEDURE ............................................................................................................................................ 12
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.
43
MICROWAVE OVEN
R-320FK
R-320FQ
R-320FW
R-320FK
R-320FQ
R-320FW
S3205R320FPW/
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  • Page 1: Table Of Contents

    R-320FK R-320FQ R-320FW SERVICE MANUAL S3205R320FPW/ MICROWAVE OVEN R-320FK MODELS R-320FQ R-320FW 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-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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 MICROWAVE OVEN R-320FK/ R-320FQ/ R-320FW 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-320FK, R-320FQ and R-320FW. 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: General Information

    R- 320 FK R- 320 FQ R-320FW 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 11-7/8" Depth 17-1/8"...

  • Page 7: Oven Diagram

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

  • Page 8: Operation

    (2) When the door is closed from the open position, the control unit. (Figure O-1). monitor switch contacts open first. Then the contacts of The display will show "SHARP SIMPLY THE BEST PRESS the secondary interlock switch and door sensing switch CLEAR AND PRESS CLOCK".
  • Page 9 R-320FK R-320FQ R-320FW 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. 2. Heat Potates. Moisture and humidity is emitted rapidly.

  • Page 10: Oven Schematic-Off Condition

    R- 320 FK R- 320 FQ R-320FW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY THERMAL MONITOR THERMAL CUT-OUT (OVEN) FUSE 20A CUT-OUT (MG.) N.O. POWER N.O.
  • Page 11 R-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW 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- 320 FK R- 320 FQ R-320FW 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.
  • Page 15 R-320FK R-320FQ R-320FW 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 16 R- 320 FK R- 320 FQ R-320FW 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-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2) Re-install the outer case (cabinet). 3) Reconnect the power supply cord after the outer case is installed. 4) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all.
  • Page 19 R-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER DEFROST CENTER TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the turntable tray in the oven cavity. (2) Close the door, touch the "...
  • Page 21 R-320FK R-320FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8) Disconnect the power supply cord, and then remove outer case. 9) Open the door and block it open. 10) Discharge high voltage capacitor. 11) Reconnect all leads removed from components during testing.
  • Page 22 R- 320 FK R- 320 FQ R-320FW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (8) Reconnect the power supply cord after the outer case is installed. (9) Reconnect the oven to the power supply and check the sensor cook operation as follows: 9-1.

  • Page 23: Touch Control Panel

    R-320FK R-320FQ R-320FW 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 24: Description Of Lsi

    R- 320 FK R- 320 FQ R-320FW DESCRIPTION OF LSI The I/O signal of the LSI 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.
  • Page 25 R-320FK R-320FQ R-320FW 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.
  • Page 26 R- 320 FK R- 320 FQ R-320FW Pin No. Signal Description 0.1 sec. H : GND Signal to sound buzzer (2.0 kHz). A: key touch sound. L : -5V 2.0 sec. H : GND B: Completion sound. L : -5V To input signal which communicates the door open/close information to LSI.
  • Page 27 R-320FK R-320FQ R-320FW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor which the resistance balance of the bridge circuit is The absolute humidity sensor includes two thermistors deviated to increase the voltage available at ANI5 as shown in the illustration. One thermistor is housed in terminal of the LSI.
  • Page 28 R- 320 FK R- 320 FQ R-320FW TOUCH CONTROL PANEL SERVICING A. On some models, the power supply cord between the 1. Precautions for Handling Electronic Components 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: Pictorial Diagram

    R- 320 FK R- 320 FQ R-320FW 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: Cpu Unit Circuit

    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 32 R- 320 FK R- 320 FQ R-320FW 3. Discharge high voltage capacitor. 4. Disconnect the wire leads from the fan motor and the INSTALLATION oven lamp. 1. Install the fan motor to the fan duct with the two (2) 5. Remove the magnetron and chassis support from the screws.
  • Page 33 R-320FK R-320FQ R-320FW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1. Disconnect the power supply cord, and then remove hook, pushing and pulling upper portion of door toward outer case. the oven face. Then check lower portion of the latch 2.
  • Page 34 R- 320 FK R- 320 FQ R-320FW chapter “Test Procedures”.). SEALER FILM (B) An approved microwave survey meter should be Installation used to assure compliance with proper microwave 1. Put the adhesive tape on the backing film of the sealer radiation emission limitation standards.
  • Page 35 R-320FK R-320FQ R-320FW RECTIFIER H.V. N.O.
  • Page 36 R- 320 FK R- 320 FQ R-320FW 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 R-320FK R-320FQ R-320FW COM2 COM0 ANI2 COM1 COM1 ANI1 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...

  • Page 38: Printed Wiring Board

    R- 320 FK R- 320 FQ R-320FW (RED) (GREEN) CN - C SH - B SH - A B R1 (CN - B) (J2) (R9) (D10) (CN - D) (J1) CN - A Figure S-4. Printed Wiring Board of Power Unit...

  • Page 39: Parts List

    DPWBFC246WRKZ CPU unit 3- 3 FPNLCB615WRKZ Control panel frame with key unit [R-320FW] 3- 3 FPNLCB616WRKZ Control panel frame with key unit [R-320FK] 3- 3 FPNLCB617WRKZ Control panel frame with key unit [R-320FQ] 3- 3-1 FUNTKB107WREZ Key unit [R-320FW] 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-320FK R-320FQ R-320FW OVEN AND CABINET PARTS 4-23 4-25 4-22 1-14 7-10 4-17 4-20 4-13 4-24 4-23 4-11 4-10 4-21 4-19 4-22 4-12 4-21 4-15 1-13 4-14 4-26 4-18 1-12 1-10 4-16 1-11...
  • Page 42 R- 320 FK R- 320 FQ R-320FW CONTROL PANEL PARTS DOOR PARTS 5-11 3-3-1 5-10 5-10 MISCELLANEOUS Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    R-320FK R-320FQ R-320FW TOP PAD ASSEMBLY PACKING AND ACCESSORIES FPADBA458WRKZ PLASTIC SHEET (for R-320FK) SPADPA616WREZ DOOR PROTECTION SHEET CABINET COVER (for R-320FK/320FQ) SPADPA204WRE0 SPAKHA011WRE0 PLASTIC BAG SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (for R-320FK/320FQ) INSTRUCTION BOOK & PRINTING MATTER BOTTOM PAD ASSEMBLY...
  • 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. 2002 SHARP CORP. (2S2.530E) Printed in U.S.A...

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