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R-426HS
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 ............................................................................................................................. 10
TEST PROCEDURE ............................................................................................................................................ 11
TOUCH CONTROL PANEL .................................................................................................................................. 22
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 28
PICTORIAL DIAGRAM ........................................................................................................................................ 35
CPU UNIT CIRCUIT ............................................................................................................................................. 36
PRINTED WIRING BOARD ................................................................................................................................. 37
PARTS LIST ........................................................................................................................................................ 38
PACKING AND ACCESSORIES ......................................................................................................................... 42
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.
S13M203R426HE
MICROWAVE OVEN
R-426HS
R-426HK
R-426HW
R - 426HS
R- 426HK
R-426HW
Page
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Summary of Contents for Sharp R-426HS
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Page 1: Table Of Contents
PARTS LIST ................................ 38 PACKING AND ACCESSORIES ......................... 42 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-426HS R-426HK R-426HW 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 2 6 H S R - 4 2 6 H K R-426HW 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-426HS/R-426HK/R-426HW 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-426HS, R-426HK & R-426HW. It is recommended that service personnel carefully study the entire text... -
Page 6: Product Specifications
R - 4 2 6 H S R - 4 2 6 H K R-426HW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 14.3 Amperes, 1700 watts 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC 705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 21-21/32"... -
Page 7: Oven Diagram
R-426HS R-426HK R-426HW a qualified electrician and have it replaced with a properly grounded Grounded Receptacle Box 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 countertop or table where it can be pulled on by children or tripped over accidentally. -
Page 8: Operation
Then the contacts of 1. The display will show flashing: the primary interlock switch and door sensing switch "SHARP SIMPLY THE BEST..". close. And contacts of the relay (RY1) open. To set any program or set the clock, you must first touch If the primary interlock switch and secondary interlock relay the STOP/CLEAR pad. - Page 9 R-426HS R-426HK R-426HW 2. The coil of shut-off relay (RY-1) is energized, the turntable motor are turned on, but the power transformer SENSOR COOKING CONDITION is not turned on. 3. After about 16 seconds, the cook relay (RY-2) is energized.
- Page 10 R - 4 2 6 H S R - 4 2 6 H K R-426HW Note:* Indicates component SCHEMATIC NOTE: CONDITION OF OVEN 1. Door Closed 2. CLOCK APPEARS ON DISPLAY CAVITY TEMPERATURE FUSE FUSE N.O. COM. DOOR SENSING POWER SWITCH TRANSFORMER HUMIDITY...
- Page 11 R-426HS R-426HK R-426HW 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 12: Troubleshooting Guide
R - 4 2 6 H S R - 4 2 6 H K R-426HW 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 13: Test Procedure
R-426HS R-426HK R-426HW 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 N TEST PROCEDURE PROBLEM CONDITION Home fuse or circuit breaker blows... - Page 14 R - 4 2 6 H S R - 4 2 6 H K R-426HW 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.
- Page 15 R-426HS R-426HK R-426HW 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 16 R - 4 2 6 H S R - 4 2 6 H K R-426HW 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"...
- Page 17 R-426HS R-426HK R-426HW 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. Discharge high voltage capacitor. 4. Before performing this test, make sure that the primary interlock switch and the secondary interlock relay are operating properly, according to the above Switch Test Procedure.
- Page 18 R - 4 2 6 H S R - 4 2 6 H K R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
- Page 19 R-426HS R-426HK R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6) Reconnect the power supply cord after the outer case is installed. 7) Run the oven and check all functions. KEY UNIT TEST 1. Disconnect the power supply cord, and then remove outer case.
- Page 20 R - 4 2 6 H S R - 4 2 6 H K R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS Approx. 24.0V D.C. Oven lamp / Turntable motor / Cooling fan motor Approx. 24.0V D.C. Power transformer 8.
- Page 21 R-426HS R-426HK R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are finished. 1) Disconnect the power supply cord, and then remove outer case.
- Page 22 R - 4 2 6 H S R - 4 2 6 H K R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (5) The oven will operate for the first 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of sensor cooking.
- Page 23 R-426HS R-426HK R-426HW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (15) Reconnect all leads removed from components during testing and repairing. (16) Re-install the outer case (cabinet). (17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
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Page 24: Touch Control Panel
R - 4 2 6 H S R - 4 2 6 H K R-426HW 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 25 R-426HS R-426HK R-426HW 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 26 R - 4 2 6 H S R - 4 2 6 H K R-426HW Pin No. Signal Description INT0 Signal synchronized with commercial power source frequency. H : GND This is the basic timing for time processing of LSI. L : -5V 16.7 msec.
- Page 27 R-426HS R-426HK R-426HW 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 SEG13 (59) ....... SEG 13 SEG1 (71) ........
- Page 28 R - 4 2 6 H S R - 4 2 6 H K R-426HW ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor balance of the bridge circuit is deviated to increase the The absolute humidity sensor includes two thermistors voltage available at AN1 terminal of the LSI.
- Page 29 R-426HS R-426HK R-426HW 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 30: 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 31 R-426HS R-426HK R-426HW 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 locations.
- Page 32 R - 4 2 6 H S R - 4 2 6 H K R-426HW OVEN LAMP AND LAMP SOCKET REMOVAL 1. Disconnect the power supply cord and remove outer case. Oven lamp socket 2. Open the door and block it open. 3.
- Page 33 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 turntable of the turntable motor cover.
- Page 34 R - 4 2 6 H S R - 4 2 6 H K COOLING FAN MOTOR REMOVAL R-426HW REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove outer * Do not reuse the removed fan blade because the hole case.
- Page 35 R-426HS R-426HK R-426HW 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. Make sure that the monitor switch is operating properly DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1.
- Page 36 R - 4 2 6 H S R - 4 2 6 H K R-426HW 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. Upper Oven Upper Hinge...
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Page 37: Pictorial Diagram
R-426HS R-426HK R-426HW... -
Page 38: Cpu Unit Circuit
R - 4 2 6 H S R - 4 2 6 H K R-426HW... -
Page 39: Printed Wiring Board
R-426HS R-426HK R-426HW 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 40: Parts List
AH Sensor CABINET PARTS 2- 1 GDAI-B069MRP0 Base plate 2- 2 GLEGPB004MRF0 Foot 2- 3 GCABUB125MRP0 Outer case cabinet [R-426HS] 2- 3 GCABUB092MRP0 Outer case cabinet [R-426HK] 2- 3 GCABUB093MRP0 Outer case cabinet [R-426HW] CONTROL PANEL PARTS 3- 1 GPNLCB034/KIT... - Page 41 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 42 R - 4 2 6 H S R - 4 2 6 H K R-426HW OVEN AND CABINET PARTS 1-13 4-12 1-12 4-10 1-10 1-11 4-11...
- Page 43 R-426HS R-426HK R-426HW CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration.
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Page 44: Packing And Accessories
R - 4 2 6 H S R - 4 2 6 H K R-426HW PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET 6-4 TURNTABLE TRAY PLASTIC BAG TRAY HOLDER 6-7 OPERATION MANUAL BOTTOM PAD ASSEMBLY 6-3 TURNTABLE SUPPORT PACKING CASE... - Page 45 R-426HS R-426HK R-426HW NOTES...
- Page 46 R - 4 2 6 H S R - 4 2 6 H K R-426HW NOTES...
- Page 47 R-426HS R-426HK R-426HW NOTES...
- Page 48 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. 2003 SHARP CORP. (2M2.20E) Printed in U.S.A...