Sharp R-308KK Service Manual
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Sharp R-308KK Service Manual

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See also: Operating Manual
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
BEFORE SERVICING
CHAPTER 1. WARNING TO SERVICE PERSONNEL
CHAPTER 2. MICROWAVE MEASUREMENT PRO-
CEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
CHAPTER 5. GENERAL INFORMATION
CHAPTER 6. OPERATION

SHARP CORPORATION

SERVICE MANUAL
MICROEAVE OVEN
MODELS
In the interest of user-safety the oven should be restored to its origi-
nal 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 cur-
rent, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness etc..)
CONTENTS
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 12. CIRCUIT DIAGRAMS
Parts Guide
No. S2504R308KPKW
R-308KK
R-308KW
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
R-308KK
R308KW

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  • Page 1: Sharp Corporation

    R-308KK R308KW SERVICE MANUAL No. S2504R308KPKW MICROEAVE OVEN R-308KK MODELS R-308KW In the interest of user-safety the oven should be restored to its origi- nal condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens con-...

  • Page 2: Table Of Contents

    CONTENTS PRECAUTIONS TO BE OBSERVED BEFORE AND [11] Procedure I : NOISE FILTER TEST... 8-4 DURING SERVICING TO AVOID POSSIBLE EXPO- [12] Procedure J : TOUCH CONTROL PANEL SURE TO EXCESSIVE MICROWAVE ENERGY ASSEMBLY TEST........8-4 [13] Procedure K : KEY UNIT TEST ....

  • Page 3: Precautions To Be Observed Before And During Servicing To Avoid Possible Expo

    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 4: Before Servicing

    R308KW CHAPTER 1. R308KW WARNING TO SERVICE PERSONNEL Service Manual Microwave ovens contain circuitry capable of producing 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 Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions.

  • Page 5: Chapter 2. Microwave Measurement Pro

    R308KW CHAPTER 2. R308KW MICROWAVE MEASUREMENT PROCEDURE Service Manual [1] Requirements: 1. Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/ at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the use- ful life of the oven), 5 mW/cm at any point 5cm or more from the external surface of the oven.

  • Page 6: Chapter 3. Foreword And Warning

    Service Manual [1] FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-308KK and R-308KW. 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 7: Chapter 4. Product Description

    R308KW CHAPTER 4. R308KW PRODUCT DESCRIPTION Service Manual [1] SPECIFICATIONS ITEM DESCRIPTION 120 Volts Power Requirements 60 Hertz Single phase, 3 wire grounded Power Consumption 1530W / Approx. 13 Amperes 1100 W nominal of RF microwave energy (IEC Test procedure) Power Output Operating frequency 2450 MHz Width 20-1/2"...

  • Page 8: Chapter 5. General Information Grounding Instructions

    R308KW CHAPTER 5. R308KW GENERAL INFORMATION Service Manual [1] GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accor- dance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
  • Page 9 R308KW 2. TOUCH CONTROL PANEL NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes when the oven is not in use. These fea- tures are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed. 5 –...

  • Page 10: Chapter 6. Operation Description Of Operating Se- Quence

    R308KW CHAPTER 6. R308KW OPERATION Service Manual [1] DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. OFF CONDITION 3. POWER LEVEL P-0 TO P-90 COOKING Closing the door activates door sensing switch and secondary inter- When Variable Cooking Power is programmed, the 120 volts A.C.

  • Page 11: Oven Schenatic

    R308KW [2] OVEN SCHENATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potentials above 250V (MAGNETRON) POWER TRANSFORMER N.O. FUSE PRIMARY INTERLOCK RELAY (RY2) CAPACITOR 0.19μF CONTROL UNIT AC 2100V 120V AC...

  • Page 12: Description And Function Of Components

    R308KW [3] DESCRIPTION AND FUNCTION OF COMPONENTS 1. DOOR OPEN MECHANISM 4. TURNTABLE MOTOR The door is opened by pushing the open button on the control panel, The turntable motor rotates the turntable located on the bottom of the refer to the Figure D-1. oven cavity, so that the food on the turntable is cooked evenly.

  • Page 13: Chapter 7. Troubleshooting Guide

    R308KW CHAPTER 7. R308KW TROUBLESHOOTING GUIDE Service Manual 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 14: Procedure A : Magnetron Assembly Test

    R308KW CHAPTER 8. R308KW TEST PROCEDURES Service Manual [1] Procedure A : 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: Procedure D : High Voltage Capacitor Test

    R308KW 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: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts. [4] Procedure D : HIGH VOLTAGE CAPACITOR TEST 1.

  • Page 16: Procedure F : Primary Interlock System Test

    R308KW 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. [8] Procedure F : PRIMARY INTERLOCK SYSTEM TEST 1. DOOR SENSING SWITCH 1. Disconnect the power supply cord, and then remove outer case. 2.

  • Page 17: Procedure H : Blown Minitor Fuse Test

    R308KW [10] Procedure H : BLOWN MINITOR FUSE 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. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...

  • Page 18: Procedure K : Key Unit Test

    R308KW 2. Control Unit. The following symptoms indicate a defective control unit. 1) In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2) In connection with indicators a) At a certain digit, all or some segments do not light up.

  • Page 19: Procedure L : Relay Test

    R308KW START WARM REHEAT TIMER COOK CLOCK STOP MINUTE CLEAR PLUS POWER MELT SOFTEN DEFROST POPCORN LEVEL Pin NO. G1 Pin NO. G12 Key unit ribbon cable Key unit (Membrane Switch) front view [14] Procedure L : RELAY TEST 1. Disconnect the power supply cord, and then remove outer case. 2.

  • Page 20: Procedure N : Foil Pattern On The Printed Wiring Board Test

    R308KW [16] Procedure N : 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. 1.

  • Page 21: Chapter 9. Touch Control Panel Assem

    R308KW CHAPTER 9. R308KW TOUCH CONTROL PANEL ASSEMBLY Service Manual [1] OUTLINE OF TOUCH CONTROL PANEL This circuit consists of 14 segments and 3 common electrodes using a Liquid Crystal Display. The touch control section consists of the following units. 3) Power Source Circuit 1) Key Unit This circuit generates voltages necessary in the control unit from...
  • Page 22 R308KW Pin No. Signal Description COM1 OUT Common data signal. Connected to LCD signal COM2. COM2 OUT Common data signal. Connected to LCD signal COM3. COM3 OUT Terminal not used. 26-39 SEG0-SEG13 OUT Segment data signal. Connected to LCD.The relation between signals are as follows: LSI signal (Pin No.) LCD (segment) LSI signal (Pin No.)

  • Page 23: Servicing For Touch Control Panel

    R308KW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P50, P51, P52 and P53 terminal while one of G8 line keys on key matrix is touched. BZO90 Signal to sound buzzer (2.0 kHz). A: key touch sound.

  • Page 24: Chapter 10. Precautions For Using Lead-Free Solder

    R308KW CHAPTER 10. R308KW PRECAUTIONS FOR USING LEAD-FREE SOLDER Service Manual [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 suf- fix letter indicates the alloy type of the solder.

  • Page 25: Adjustment Procedure 1] Warnings

    1. Door does not close firmly. 4. If the outer case (cabinet) is not fitted. WARNING FOR WIRING To prevent an electric shock, take the following precau- 3) Sharp edge: tions. Bottom plate, Oven cavity, Waveguide flange and 1. Before wiring, other metallic plate.

  • Page 26: Outer Case Removal

    R308KW [2] OUTER CASE REMOVAL To remove the outer case, procedure as follows. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver.

  • Page 27: Positive Lock Connector (No-Case Type) Removal

    R308KW 2. REINSTALLATION 4. Hold the other end of the chassis support to the magnetron with the one (1) screw. 1. Reinstall the magnetron to waveguide flange with the four (4) 5. Reconnect the wire leads to the magnetron. Refer to "PICTORIAL screws.

  • Page 28: Turntable Motor Removal

    7. Now, the turntable motor is free. 4. Where the corners have been snipped off bend corner areas flat. 8. After replacement use the one (1) screw to fit the turntable motor No sharp edges must be evident after removal of the turntable cover. motor cover.

  • Page 29: Power Supply Cord Replacement

    R308KW Coil Shaft Groove joint pliers Shaft These are the positions Axis that should be pinched Stator with pliers. Stator Table brac Rotor Bracket Rotor Side View Rear View [11] POWER SUPPLY CORD REPLACEMENT 1. REMOVAL 7. Now, the power supply cord is free. 1.

  • Page 30: Door Sensing Switch/Secondary Interlock Switch And Monitor Switch Adjustment

    R308KW [13] DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1. Adjustment Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in 1. Disconnect the power supply cord, and then remove outer case. the door) should be less than 0.5mm.
  • Page 31 R308KW 4. SEALER FILM 3. After any service, make sure of the following: 1. Put the adhesive tape on the backing film of the sealer film as 1. Door latch heads smoothly catch latch hook through latch holes shown in Fig. C-7 and that latch head goes through center of latch hole.

  • Page 32: Chapter 12. Circuit Diagrams

    R308KW CHAPTER 12. R308KW CIRCUIT DIAGRAMS Service Manual [1] Pictorial Diagram (Figure S-1) Figure S-1. Pictorial Diagram 12 – 1...

  • Page 33: Control Unit Circuit (Figure S-2)

    R308KW [2] Control Unit Circuit (Figure S-2) 4.7K 4.7K 4.7K BZO90 COM1 COM2 COM3 AIN0 AIN1 /25V 0.01uF /25V 0.01uF 17)4.7K 16)10K 14)2.2K 15)10K 12)4.7K 11)4.7K 01uF 4.7K /25V 0.1uF 4.7K /25V 0.1uF 3.3K HZ4B /10V 220uF /25V 1000uF /35V 10uF /50V 0.1uF...

  • Page 34: Printed Wiring Board Of Power Unit(Figure S-3)

    R308KW [3] Printed Wiring Board of Power Unit(Figure S-3) Figure S-3. Printed Wiring Board of Power Unit 12 – 3...

  • Page 35: Parts Guide

    R308KW PARTS GUIDE MICROWAVE OVEN HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please R-308KK furnish the following information. MODELS 1. MODEL NUMBER 2. REF. NO. R-308KW 3. PART NO. 4. DESCRIPTION Parts marked "*" may cause undue microwave exposure.
  • Page 36 R308KW [1] OVEN PARTS 7-10 7-10 7-10 1-13 4-15 4-12 7-11 4-16 1-12 4-13 7-10 7-10 7-10 1-11 4-14 4-12 4-17 4-10 1-10 4-12 4-11 7-10 7-10 7-10 4-12 7-10...
  • Page 37 Screw : 4mm x 8mm XHPSD40P08000 Screw : 4mm x 8mm XHTSD40P08RV0 Screw : 4mm x 8mm XHTSD40P08000 Screw : 4mm x 8mm 7-10 XOTSD40P08000 Screw : 4mm x 8mm [R-308KW] 7-11 XOTSE40P08000 Screw : 4mm x 8mm [R-308KK] 7-11 XOTSF40P08000...
  • Page 38 R308KW [2] DOOR AND CONTROL PANEL PARTS 3-2-1 3-2-3 3-2-2...
  • Page 39 PART PARTS CODE DESCRIPTION RANK MARK RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS Control unit DPWBFC414WRUZ Panel sub assembly [R-308KK] FPNLCB852WRKZ Panel sub assembly [R-308KW] FPNLCB851WRKZ Display window 3-2-1 GMADIA127WRRZ Graphic sheet [R-308KK] 3-2-2 PSHEPB106WREZ Graphic sheet [R-308KW]...
  • Page 40 1-7-3 LX-EZA042WRE0 1-7-5 [ M ] MLEVPA233WRF0 1-4-5 MROD-A019WREZ 1-4-16 MSPRCA050WRE0 2-3-5 COPYRIGHT © 2005 BY SHARP CORPORATION MSPRTA187WRE0 2-5-6 [ N ] NFANJA053WRFZ 1-4-3 ALL RIGHTS RESERVED. NTNT-A117WREZ 1-6-2 [ P ] No part of this publication may be reproduced, stor-...
  • Page 41 2005 © COPYRIGHT XXXX BYSHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in © any form or by any means, electronic, mechanical, COPYRIGHT XXXX BYSHARP CORPORATION photocopying, recording, or otherwise, without prior written permission of the publisher.

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