1. Manuals
  2. Brands
  3. Sharp Manuals
  4. Microwave Oven
  5. R-305HK
  6. Service manual

Sharp R-305HK Service Manual

Hide thumbs Also See for R-305HK:
Table of Contents

Advertisement

Quick Links

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 .............................................................................................................................. 9
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 17
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 28
CONTROL UNIT CIRCUIT .................................................................................................................................. 29
PRINTED WIRING BOARD ................................................................................................................................. 30
PARTS LIST ........................................................................................................................................................ 31
PACKING AND ACCESSORIES ......................................................................................................................... 32
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-305HK
R-305HW
R-305HK
R-305HW
S2305R305HPW/
Page

Advertisement

Table of Contents
loading

Related Manuals for Sharp R-305HK

Summary of Contents for Sharp R-305HK

  • Page 1: Table Of Contents

    R-305HK R-305HW SERVICE MANUAL S2305R305HPW/ MICROWAVE OVEN R-305HK MODELS R-305HW 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-305HK R-305HW 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-305HK R-305HW 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-305HK/ R-305HW 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-305HK and R-305HW. 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-305HK R-305HW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.5 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" Height 12-1/4" Depth 17-3/4" Cooking Cavity Dimensions Width 14-1/2"...
  • Page 7 R-305HK R-305HW 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-305HK R-305HW 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...
  • Page 9 R-305HK R-305HW SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potential above 250V. 2. CLOCK APPEARS ON DISPLAY C/T FUSE TEMPERATURE FUSE 150˚C (OVEN) POWER TRANSFORMER N.O. PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.94 F...
  • Page 10 R-305HK R-305HW 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 11: Troubleshooting Guide

    R-305HK R-305HW 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-305HK R-305HW 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 TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows...
  • Page 13 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reconnect all leads removed from components during testing. 7. Reinstall the outer case (cabinet). 8. Reconnect the power supply cord after the outer case is installed. 9. Run the oven and check all functions.
  • Page 14 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER defective and should be replaced. 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.
  • Page 15 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling fan, turntable and oven light will be activated by RY1.
  • Page 16 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER especially the cooling fa air guide. CAUTION: IF THE C/T FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THE C/T FUSE. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet).
  • Page 17 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2) Open the door and block it open. 3) Discharge high voltage capacitor. 4) Reconnect all leads removed from components during testing. 5) Re-install the outer case (cabinet). 6) Reconnect the power supply cord after the outer case is installed.
  • Page 18 R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 19: Touch Control Panel

    R-305HK R-305HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between the normal open terminal of the relay RY1 and Check supply voltage and oven power cord. the normal open terminal of the relay RY2.

  • Page 20: Description Of Lsi

    R-305HK R-305HW DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description Signal coming from touch key. When either G9 line on key matrix is touched, a corresponding signal out of P22 - P26 and P31 - P33 will be input into P50.
  • Page 21 R-305HK R-305HW Pin No. Signal Description Oven lamp, fan motor and turntable motor driving signal 16.7 msec. To turn on and off shut off relay (RY1). The H : GND square waveform voltage is delivered to the RY1 driving circuit and RY2 control circuit.
  • Page 22 R-305HK R-305HW Pin No. Signal Description 0.1 sec. BZO90 Signal to sound buzzer (2.0 kHz). H : GND A: key touch sound. L : -5V B: Completion sound. 2.0 sec. H : GND L : -5V Terminal not used. TOUCH CONTROL PANEL SERVICING A.
  • Page 23 R-305HK R-305HW PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.

  • Page 24: 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 25: High Voltage Rectifier/Capacitor Removal

    R-305HK R-305HW 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 Special screw Torx screws must be reinstalled in the same locations.
  • Page 26 R-305HK R-305HW ® 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 27 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 28 R-305HK R-305HW 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 29 R-305HK R-305HW 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 30: Pictorial Diagram

    R-305HK R-305HW...

  • Page 31: Control Unit Circuit

    R-305HK R-305HW...

  • Page 32: Printed Wiring Board

    R-305HK R-305HW Figure S-3. Printed Wiring Board of Power Unit...

  • Page 33: Parts List

    1-11 RV-MZA288WRE0 Magnetron 1-11 RV-MZA321WRZZ Magnetron (Interchangeable) for production use CABINET PARTS GCABUA883WRPZ Outer case cabinet (R-305HW) GCABUA889WRPZ Outer case cabinet (R-305HK) FDAI-A265WRYZ Bottom plate GLEGPA074WRE0 Foot CONTROL PANEL PARTS CPWBFA858WRKZ Control unit assembly HPNLCB804WRFZ Control panel frame (R-305HW) HPNLCB805WRFZ...

  • Page 34: Packing And Accessories

    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. TOP PAD ASSEMBLY FPADBA515WRKZ PACKING AND ACCESSORIES...

  • Page 35: Oven And Cabinet Parts

    R-305HK R-305HW 7-10 OVEN AND CABINET PARTS 7-10 7-10 4-15 7-11 7-12 4-16 4-13 7-10 7-10 7-10 1-11 4-14 4-12 4-17 4-10 1-10 4-11 7-10 7-10 7-10 7-10...
  • Page 36 R-305HK R-305HW CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration. 2003 SHARP CORP. (2S1.700E) Printed in U.S.A...

This manual is also suitable for:

R-305hw

Table of Contents