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Sharp R-308DW Service Manual

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R-310DW
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 ................................................................................................................................. 18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ........................................................................................................................................ 28
POWER UNIT CIRCUIT ...................................................................................................................................... 29
CPU UNIT CIRCUIT ............................................................................................................................................ 30
PRINTED WIRING BOARD ................................................................................................................................. 32
PARTS LIST ........................................................................................................................................................ 33
PACKING AND ACCESSORIES ......................................................................................................................... 37
SHARP CORPORATION
SERVICE MANUAL
MODELS
POPCORN
BEVERAGE
MINUTE PLUS
INSTAN T ACTIO N
TO ADJUST QUANTITY
- TOUCH PAD AGAIN
1 GROUND MEAT
2 STEAKS/C HOPS
3 CHICKEN PIECES
COMPU DEFROST
1
2
3
4
5
6
7
8
9
POWER
0
LEVEL
TIMER
CLOCK
STOP
CLEA R
STA RT
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

MICROWAVE OVEN
R-308DW
R-310DK
R-310DW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R -308 DW
R - 31 0 DK
R -310 DW
S1001R310DPW/
Page

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Summary of Contents for Sharp R-308DW

  • Page 1: Table Of Contents

    R -308 DW R - 31 0 DK R -310 DW SERVICE MANUAL S1001R310DPW/ MICROWAVE OVEN R-308DW MODELS R-310DK POPCORN BEVERAGE MINUTE PLUS INSTAN T ACTIO N TO ADJUST QUANTITY - TOUCH PAD AGAIN R-310DW 1 GROUND MEAT 2 STEAKS/C HOPS...

  • 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-308DW R -310DK R -310DW 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-308DW R -310 DK R-310DW 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-308DW/ R-310DK/ R-310DW 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-308DW, R-310DK, R-310DW. 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-308DW R -310 DK R-310DW 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"...

  • Page 7: Oven Diagram

    R-308DW R -310DK R -310DW 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-308DW R -310 DK R-310DW 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-308DW R -310DK R -310DW 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 10 R-308DW R -310 DK R-310DW 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 11: Troubleshooting Guide

    R-308DW R -310DK R -310DW 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-308DW R -310 DK R-310DW 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-308DW R -310DK R -310DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 14 R-308DW R -310 DK R-310DW 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 15 R-308DW R -310DK R -310DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 16 R-308DW R -310 DK R-310DW 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.
  • Page 17 R-308DW R -310DK R -310DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal.
  • Page 18 R-308DW R -310 DK R-310DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. MINUTE ROLLS & MINUTE ROLLS & PLUS MUFFINS PLUS...
  • Page 19 R-308DW R -310DK R -310DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 20: Touch Control Panel

    R-308DW R -310 DK R-310DW TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit The The touch control section consists of the following units. This circuit generates voltages necessary in the control unit from the AC line voltage.
  • Page 21 R-308DW R -310DK R -310DW Pin No. Signal Description Back light circuit (Light emitting diodes) driving signal. 12-13 P56-P55 Terminal not used. CNTR0 Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. L : -5V B: Completion sound.
  • Page 22 R-308DW R -310 DK R-310DW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45 terminal while one of G8 line keys on key matrix is touched.
  • Page 23 R-308DW R -310DK R -310DW TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the This unit uses CMOS LSI in the integral part of the oven.

  • Page 24: 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 25 R-308DW R -310DK R -310DW 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 26 R-308DW R -310 DK R-310DW is not hit by any metal object around antenna. cavity front plate and the back plate. 10.Remove the two (2) screws holding the magnetron duct 4. Hold the chassis support to the oven cavity back plate, to magnetron.
  • Page 27 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 28 R-308DW R -310 DK R-310DW DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1. Disconnect the power supply cord and remove outer case. 2. Open the door and block it open. 1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and 3.
  • Page 29 R-308DW R -310DK R -310DW 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 30: Pictorial Diagram

    R-308DW R -310 DK R-310DW RECTIFIER H.V.

  • Page 31: Power Unit Circuit

    R-308DW R -310DK R -310DW CN-C CN-A 9PIN LEAD WIRE HARNESS S1NB10 – OVEN LAMP TURNTABLE BUZZER MOTOR FAN MOTOR OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICRO MICRO SH-A DOOR DOOR SENSING SH-B SWITCH SENSING SWITCH...

  • Page 32: Cpu Unit Circuit

    R-308DW R -310 DK R-310DW COM1 COM2 COM3 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VREF XOUT AVSS COM3 COM2 COM1 RESET COM0 4.7k 4.7k 4.7k /25v 0.01...
  • Page 33 R-308DW R -310DK R -310DW COM1 COM2 COM3 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 VREF XOUT AVSS COM3 COM2 COM1 RESET COM0 4.7k 4.7k 4.7k /25v 0.01...

  • Page 34: Printed Wiring Board

    R-308DW R -310 DK R-310DW SH - B CN - C (D2) (D3) CN - A Figure S-5. Printed Wiring Board of Power Unit...

  • Page 35: Parts List

    FPNLCB475WRKZ Control panel frame with key unit [R-310DK] 3- 3 FPNLCB478WRKZ Control panel frame with key unit [R-310DW] 3- 3 FPNLCB499WRKZ Control panel frame with key unit [R-308DW] 3- 3-1 FUNTKA970WREZ Key unit [R-310DK] 3- 3-1 FUNTKA973WREZ Key unit [R-310DW]...
  • Page 36 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 37: Oven And Cabinet Parts

    R -308 DW R - 31 0 DK R -310DW OVEN AND CABINET PARTS 4-22 1-10 1-11 4-17 1-13 4-20 4-13 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 38 R-30 8DW R -3 10 DK R-310 DW CONTROL PANEL PARTS DOOR PARTS 3-3-1 MISCELLANEOUS (CAPACITOR) Actual wire harness may be different from illustration.

  • Page 39: 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 SPAKCD335WREZ [R-310DK] SPAKCD342WREZ [R-310DW] SPAKCD384WREZ [R-308DW]...
  • Page 40 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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