Sharp R-320EK Service Manual
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Sharp R-320EK 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.
MICROWAVE OVEN
R-320EK
R-320EQ
R-320EW
R - 32 0 EK
R- 320 EQ
R-320EW
S1106R320EPW/
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  • Page 1: Table Of Contents

    R - 32 0 EK R- 320 EQ R-320EW SERVICE MANUAL S1106R320EPW/ MICROWAVE OVEN R-320EK MODELS R-320EQ R-320EW 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-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW 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-320EK/ R-320EQ/ R-320EW 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-320EK, R-320EQ, R-320EW. 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 EK R- 320EQ R-320EW 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 R-320EK R-320EQ R-320EW 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

    R- 320 EK R- 320EQ R-320EW 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 switch open their contacts.
  • Page 9 R-320EK R-320EQ R-320EW 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 R- 320 EK R- 320EQ R-320EW 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-2) (RY-1) PRIMARY INTERLOCK RELAY CONTROL UNIT COM. COM.
  • Page 11 R-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW 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-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW 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-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW 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. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT.
  • Page 17 R-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. a) When touching the pads, a certain pad produces no signal at all.
  • Page 19 R-320EK R-320EQ R-320EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the control 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- 320 EK R- 320EQ R-320EW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER COMPU DEFROST 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-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW 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-320EK R-320EQ R-320EW 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 R- 320 EK R- 320EQ R-320EW LSI(IXA097DR) The I/O signal of the LSI(IXA097DR) 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-320EK R-320EQ R-320EW 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 EK R- 320EQ R-320EW Pin No. Signal Description Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. B: Completion sound. L : -5V 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-320EK R-320EQ R-320EW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor resistance balance of the bridge circuit is deviated to The absolute humidity sensor includes two thermistors increase the voltage available at ANI5 terminal of the as shown in the illustration. One thermistor is housed in LSI.
  • Page 28 R- 320 EK R- 320EQ R-320EW 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 EK R- 320EQ R-320EW 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

    R-320EK R-320EQ R-320EW 9. Now, the magnetron is free. 4. Reconnect the wire leads to the magnetron and thermal Reinstallation cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page 1. Re-install the magnetron to waveguide flange with the four (4) screws.
  • 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-320EK R-320EQ R-320EW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Reinstallation 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.
  • Page 34 R- 320 EK R- 320EQ R-320EW 11.Now, door panel with sealer film is free. 12.Tear sealer film from door panel. 13.Now, door panel is free. Upper Oven 14.Slide latch head upward and remove it from door frame Upper Hinge Oven Hinge with releasing latch spring from door frame and latch head.
  • Page 35 R-320EK R-320EQ R-320EW...
  • Page 36 R- 320 EK R- 320EQ R-320EW 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-320EK R-320EQ R-320EW...
  • Page 38 R- 320 EK R- 320EQ R-320EW (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

    RH-VZA032DRE0 Varistor (10G471K) 3- 2 DPWBFC165WRKZ CPU unit 3- 3 FPNLCB559WRKZ Control panel frame with key unit [R-320EK] 3- 3 FPNLCB560WRKZ Control panel frame with key unit [R-320EW] 3- 3 FPNLCB561WRKZ Control panel frame with key unit [R-320EQ] 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 - 32 0 EK R- 320 EQ R-320EW OVEN AND CABINET PARTS 4-23 4-25 4-22 1-15 7-10 1-11 1-10 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 4-18 1-12 1-14 4-16 4-15...
  • Page 42 R - 320 EK R- 320EQ R-320EW CONTROL PANEL PARTS DOOR PARTS 5-11 3-3-1 5-10 5-10 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.

  • Page 43: Packing And Accessories

    FPADBA416WRKZ DOOR PROTECTION SHEET CABINET COVER SPADPA204WRE0 SPAKHA011WRE0 (for R-310EK/320EQ) PLASTIC BAG SSAKHA034WRE0 FOAM SHEET SPAKHA012WREZ (for R-320EK/320EQ) 6- 8 INSTRUCTION BOOK & PRINTING MATTER BOTTOM PAD ASSEMBLY 6- 2 TURNTABLE TRAY FPADBA417WRKZ 6- 1 TURNTABLE SUPPORT TRAY PACK INTO THE...
  • 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. 2001 SHARP CORP. (3S2.530E) Printed in U.S.A...

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R-320eqR-320ew

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