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R-408JW
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 .................................................................. 23
PICTORIAL DIAGRAM ........................................................................................................................................ 30
CPU UNIT CIRCUIT ............................................................................................................................................. 31
PRINTED WIRING BOARD ................................................................................................................................. 32
PARTS LIST ........................................................................................................................................................ 33
PACKING AND ACCESSORIES ......................................................................................................................... 37
SHARP ELECTRONCS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
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 OVENS
R-408JK
R-408JW
R - 4 0 8 J K
R- 408JW
S24M231R408JE
Page
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Summary of Contents for Sharp R-408JK
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Page 1: Table Of Contents
PARTS LIST ................................ 33 PACKING AND ACCESSORIES ......................... 37 This document has been published to be used for after sales service only. SHARP ELECTRONCS CORPORATION The contents are subject to change without notice. Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135... -
Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy
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-408JK R-408JW 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 - 4 0 8 J K R - 4 0 8 J W 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... -
Page 5: Foreword And Warning
MICROWAVE OVEN R-408JK/R-408JW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP OPERATION MICROWAVE OVENS R-408JK and R-408JW. It is recommended that service personnel carefully study the entire text... -
Page 6: Product Specifications
R - 4 0 8 J K R - 4 0 8 J W SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 14.3 Amperes, 1700 watts 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 21-21/32"... - Page 7 R-408JK R-408JW a qualified electrician and have it replaced with a properly grounded Grounded three-pronged wall receptacle or have a grounding adapter properly Receptacle Box 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 countertop or table where it can be pulled on by children or tripped over accidentally.
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Page 8: Operation
R - 4 0 8 J K R - 4 0 8 J W OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during and is mechanically associated with the door so that it will oven operation. function in the following sequence. - Page 9 R-408JK R-408JW Note:* Indicates component SCHEMATIC NOTE: CONDITION OF OVEN 1. Door Closed 2. CLOCK APPEARS ON DISPLAY C AV IT Y C /T T E MP E R AT UR E F US E OR G F US E...
- Page 10 R - 4 0 8 J K R - 4 0 8 J W DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM 3. If the door is opened, and the secondary interlock relay (RY2) and primary interlock switch contacts fail to open, The door is opened by pushing the open button on the control the C/T fuse blows simultaneously with closing of the panel, refer to the Figure D-1.
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Page 11: Troubleshooting Guide
R-408JK R-408JW 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 - 4 0 8 J K R - 4 0 8 J W CK = Check / RE = Replace RE RE A B C D E E F F G H RE RE CK I CK CK CK J K L M TEST PROCEDURE PROBLEM CONDITION... - Page 13 R-408JK R-408JW 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. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
- Page 14 R - 4 0 8 J K R - 4 0 8 J W 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.
- Page 15 R-408JK R-408JW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. If the C/T fuse is blown when the door is opened, check the secondary interlock relay, primary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.
- Page 16 R - 4 0 8 J K R - 4 0 8 J W TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MONITOR SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3.
- Page 17 R-408JK R-408JW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Control Unit The following symptoms indicate a defective control unit. 2-1 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.
- Page 18 R - 4 0 8 J K TEST PROCEDURES R - 4 0 8 J W PROCEDURE COMPONENT TEST LETTER NO. G1 NO. G13 Key unit ribbon cable NIGHT KEEP FRESH MELT DEFROST POPCORN VEGETABLES WATER LIGHT WARM TIMER BAKED POWER GROUND REHEAT...
- Page 19 R-408JK R-408JW 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.
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Page 20: Touch Control Panel
R - 4 0 8 J K R - 4 0 8 J W 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. - Page 21 R-408JK R-408JW DESCRIPTION OF LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description VL2-VL1 Power source voltage input terminal. Standard voltage for LCD. AN7-AN4 Terminal to change cooking input according to the Model.
- Page 22 R - 4 0 8 J K R - 4 0 8 J W Pin No. Signal Description Signal similar to AN3. When either G11 line on key matrix is touched, a corresponding signal will be input into P41. Connected to GND through the pull-down resistor. RESET Auto clear terminal.
- Page 23 R-408JK R-408JW Pin No. Signal Description Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.) SEG0 (72) ........ SEG 0 SEG11 (61) ....... SEG 11 SEG1 (71) ........
- Page 24 R - 4 0 8 J K R - 4 0 8 J W 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.
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Page 25: Component Replacement And Adjustment Procedure
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, 1. Before wiring: Chassis support and other metallic plate. - Page 26 R - 4 0 8 J K R - 4 0 8 J W 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. Special screw NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same...
- Page 27 R-408JK R-408JW OVEN LAMP AND LAMP SOCKET REMOVAL 1. Disconnect the power supply cord and remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Remove the oven lamp from the oven lamp socket.
- Page 28 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 provided with the of the turntable motor cover.
- Page 29 R-408JK R-408JW COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove outer * Do not reuse the removed fan blade because the hole case. (for shaft) may be larger than normal. 2. Open the door and block it open.
- Page 30 R - 4 0 8 J K R - 4 0 8 J W 3. Secure latch hook (with two (2) mounting screws) to oven and check continuity of the monitor circuit. Refer to chapter flange. "Test Procedure" and Adjustment procedure. 4.
- Page 31 R-408JK R-408JW 9. Release the door panel from twelve (12) tabs of door frame. 10.Remove the door panel from the door frame. 11.Now, door panel with sealer film is free. 12.Tear sealer film from door panel. 13.Now, door panel is free.
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Page 32: Pictorial Diagram
R - 4 0 8 J K R - 4 0 8 J W... -
Page 33: Cpu Unit Circuit
R-408JK R-408JW... -
Page 34: Printed Wiring Board
R - 4 0 8 J K R - 4 0 8 J W CHIP SIDE CN-F 1 2 3 CN-B WH-2 WH-2 Q4 SP1 VRS1 Figure S-5 . Printed Wiring Board of Power Unit... -
Page 35: Parts List
2- 3 GCABUB093MRP0 Outer case cabinet [R-408JW] CONTROL PANEL PARTS 3- 1 CPWBFB097MRU0 Control unit assy 3- 2 HPNLFB010MRF0 Control panel sub assembly [R-408JK] 3- 2 HPNLFB011MRF0 Control panel sub assembly [R-408JW] 3- 3 FUNTKB404MRE0 Key sheet assy[R-408JK] 3- 3 FUNTKB405MRE0... - 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 R-408JK R-408JW OVEN AND CABINET PARTS 1-11 4-10 1-10 4-11...
- Page 38 R - 4 0 8 J K R - 4 0 8 J W CONTROL PANEL PARTS 3-13 3-10 3-11 3-12 DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration.
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Page 39: Packing And Accessories
R-408JK R-408JW PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET 6-3 TURNTABLE TRAY PLASTIC BAG TRAY HOLDER 6-6 OPERATION MANUAL BOTTOM PAD ASSEMBLY 6-2 TURNTABLE SUPPORT PACKING CASE... - 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, recording, or otherwise, without prior written permission of the publisher. 2004 SHARP CORP. (4M2.00E) Printed in U.S.A...