Sharp R-402JW-T Service Manual
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Sharp R-402JW-T Service Manual

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PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
CHAPTER 1. WARNING TO SERVICE PERSONNEL
BEFORE SERVICING
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
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 List
S5601R402JPW/

MICROWAVE OVEN

R-402JK-T
R-402JW-T
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
R402JWT

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  • Page 1: Microwave Oven

    SERVICE MANUAL S5601R402JPW/ MICROWAVE OVEN R-402JK-T MODELS R-402JW-T 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 Procedure H: BLOWN MONITOR FUSE DURING SERVICING TO AVOID POSSIBLE EXPO- TEST............8-3 SURE TO EXCESSIVE MICROWAVE ENERGY [10] Procedure I: NOISE FILTER TEST..... 8-4 [11] Procedure J: TOUCH CONTROL PANEL BEFORE SERVICING ASSEMBLY 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

    R402JWT CHAPTER 1. R402JWT 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

    R402JWT CHAPTER 2. R402JWT 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 OVEN, R-402JK-T and R-402JW-T. 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

    R402JWT CHAPTER 4. R402JWT PRODUCT DESCRIPTION Service Manual [1] SPECIFICATIONS ITEM DESCRIPTION 120 Volts Power Requirements 60 Hertz Single phase, 3 wire grounded Power Consumption 1600W / Approx. 13.5 Amperes 1100 W nominal of RF microwave energy (IEC Test procedure) Power Output Operating frequency 2450 MHz Width 21-5/8"...

  • Page 8: Chapter 5. General Information

    R402JWT CHAPTER 5. R402JWT 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 R402JWT 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

    R402JWT CHAPTER 6. R402JWT 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 the door sensing switch and primary inter- When Variable Cooking Power is programmed, the 120 volts A.C.

  • Page 11: Oven Schematic

    R402JWT [2] OVEN SCHEMATIC 1. Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY NOTE: " " indicates components with potentials above 250V DOOR SENSING SWITCH POWER TRANSFORMER (RY2) SECONDARY INTERLOCK RELAY 120VAC 60Hz CONTROL UNIT (RY1) HIGH...

  • Page 12: Description And Function Of Components

    R402JWT [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. When the open button is pushed, the open but- oven cavity, so that the foods on the turntable cook evenly during ton pushes up the switch lever, and then the switch lever pushes up cooking.

  • Page 13: Chapter 7. Troubleshooting Guide

    R402JWT CHAPTER 7. R402JWT 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

    R402JWT CHAPTER 8. R402JWT 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

    R402JWT 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. 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: Secondary Interlock System Test

    R402JWT [7] Procedure F: SECONDARY INTERLOCK SYSTEM TEST 1. DOOR SENSING SWITCH 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 switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed.

  • Page 17: Procedure I: Noise Filter Test

    R402JWT 3. Discharge high voltage capacitor. 4. If the monitor fuse is blown when the door is opened, check the primary interlock switch, secondary interlock relay (RY2), relay (RY1) and monitor switch according to the “TEST PROCEDURE” for those switches before replacing the blown monitor fuse. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK SWITCH, SECONDARY INTERLOCK RELAY, DOOR SENSING SWITCH AND MONITOR SWITCH FOR PROPER OPERATION.

  • Page 18: Procedure K: Key Unit Test

    R402JWT 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. b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up;...

  • Page 19: Procedure L: Relay Test

    R402JWT [13] Procedure L: RELAY 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. Disconnect the leads to the primary of the power transformer. 5.
  • Page 20 R402JWT 5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 563Ω±10%). If any abnormal condition is detected, replace the control unit.

  • Page 21: Chapter 9. Touch Control Panel Assem

    R402JWT CHAPTER 9. R402JWT TOUCH CONTROL PANEL ASSEMBLY Service Manual [1] OUTLINE OF TOUCH CONTROL PANEL 3) Power Source Circuit This circuit generates voltage necessary in the control unit from the The touch control section consists of the following units. AC line voltage.
  • Page 22 R402JWT Pin No. Signal Description Magnetron high-voltage circuit driving signal. To turn on and off the cook relay (RY2). The signals holds “L” level during microwave cooking and “H” level H : GND while not cooking. In other cooking modes (variable Maximum output cooking) the signal turns to “H”...
  • Page 23 R402JWT Pin No. Signal Description Segment data signal. Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (segment) LSI signal (Pin No.) LCD (segment) SEG 0 (72) ----------------- SEG 0 SEG 9 (63) ----------------- SEG 9 SEG 1 (71) ----------------- SEG 1 SEG 10(62) ----------------- SEG 10 56-72...

  • Page 24: Servicing For Touch Control Panel

    R402JWT [3] SERVICING FOR TOUCH CONTROL PANEL 1. Precautions for Handling Electronic Components b) On some models, the power supply cord between the touch control panel and the oven proper is so long enough that This unit uses CMOS LSI in the integral part of the circuits. When han- they may be separated from each other.

  • Page 25: Chapter 10. Precautions For Using Lead-Free Solder

    R402JWT CHAPTER 10. R402JWT 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 suffix letter indicates the alloy type of the solder.

  • Page 26: 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, 1. Before wiring, Chassis support and other metallic plate.

  • Page 27: Outer Case Removal

    R402JWT [2] OUTER CASE REMOVAL To remove the outer case, procedure as follows. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3.

  • Page 28: Oven Lamp Removal

    R402JWT 3. Hold the chassis support to the oven cavity front plate and the mag- 5. Reinstall outer case and check that the oven is operating properly. netron with the two (2) screws. CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F. 4.

  • Page 29: Turntable Motor Removal

    4. Where the corners have been snipped off bend corner areas flat. 8. After replacement use the one (1) screw XOTS740P10000 to fit the No sharp edges must be evident after removal of the turntable turntable motor cover. motor cover.

  • Page 30: Door Sensing Switch/Primary Interlock Switch And Monitor Switch Removal

    R402JWT Coil Shaft Groove joint pliers Shaft These are the positions Axis that should be pinched Stator with pliers. Stator Table Center of bracket Rotor Bracket Rotor Side View Rear View [12] DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL 1.
  • Page 31 R402JWT 3. Insert a putty knife (thickness of about 0.5mm) into the gap 2) An approved microwave survey meter should be used to between the door stopper and the choke cover to free engaging assure compliance with proper microwave radiation emission parts as shown in Figure C-4.

  • Page 32: Chapter 12. Circuit Diagrams

    R402JWT CHAPTER 12. R402JWT CIRCUIT DIAGRAMS Service Manual [1] Pictorial Diagram (Figure S-1) SWITCH MONITOR Figure S-1. Pictorial Diagram 12 – 1...

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

    R402JWT [2] Control Panel Circuit (Figure S-2) Figure S-2. Control Panel Circuit 12 – 2...

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

    R402JWT [3] Printed Wiring Board (Figure S-3) Figure S-3. Printed Wiring Board 12 – 3...

  • Page 35: Parts List

    6-1 TURNTABLE SUPPORT INTO THE OVEN CAVITY TRAY PACK SPADFA389WRE0 PACKING CASE FPAK-A564WRKZ [R-402JK-T] Not replaceable items. FPAK-A565WRKZ [R-402JW-T] This document has been published to be used SHARP CORPORATION for after sales service only. The contents are subject to change without notice.
  • Page 36 R402JWT [1] OVEN PARTS 7-10 7-10 4-13 4-15 4-11 1-10 7-10 4-12 7-10 1-11 4-10 1-12 4-14 1-13 7-10 7-10...
  • Page 37 1-13 RTRN-A746WRZZ Power transformer 1-13 RTRN-A745WRZZ Power transformer for production use (Interchangeable) CABINET PARTS GCABUA991WRPZ Outer case cabinet [R-402JK-T] GCABUB012WRPZ Outer case cabinet [R-402JW-T] GDAI-A390WRWZ Base plate GLEGPA104WREZ OVEN PARTS PHOK-A130WRFZ Latch hook LBNDKA163WRPZ H.V. capacitor band NFANJA053WRFZ Fan blade...
  • Page 38 R402JWT [2] DOOR & CONTROL PANEL PARTS 3-1-3 3-1-1 3-1-2 Actual wire harness may be different from illustration.
  • Page 39 PART PARTS CODE DESCRIPTION RANK MARK RANK [2] DOOR & CONTROL PANEL PARTS CONTROL PANEL PARTS FPNLCB902WRKZ Panel sub assembly [R-402JK-T] FPNLCB903WRKZ Panel sub assembly [R-402JW-T] 3-1-1 PSHEPB179WREZ Key sheet [R-402JK-T] 3-1-1 PSHEPB180WREZ Key sheet [R-402JW-T] 3-1-2 QSW-KA063DRZZ 3-1-3 GMADIA161WRFZ...
  • Page 40 [ N ] NFANJA053WRFZ 1-4-3 NTNT-A108WREZ 1-6-2 COPYRIGHT © 2006 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in anyform or by any means, electronic, mechanical, photocopying, re- cording, or other wise, without prior written permission of the publisher.

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