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Sharp KB-6524PSY Service Manual
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Sharp KB-6524PSY Service Manual

Microwave drawer
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KB-6525PSY
KB-6524PSY
THIS SERVICE MANUAL IS FOR MODELS USING THE STANDBY POWER CIRCUIT.
MODELS NOT USING STANDBY POWER, PLEASE REFER TO SERVICE MANUAL:
(KB-6524PS & KB-6525PS) - S19M304KB6524
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
SCHEMATICS ...................................................................................................................................................... 10
TROUBLESHOOTING GUIDE..............................................................................................................................11
TEST PROCEDURES .......................................................................................................................................... 13
MICROWAVE DRAWER DISASSEMBLY ............................................................................................................. 25
WIRING DIAGRAMS ............................................................................................................................................ 32
PARTS LIST ......................................................................................................................................................... 33
PACKING AND ACCESSORIES .......................................................................................................................... 38
In the interest of user-safety the unit should be restored to its original condition and only parts identical to those specified
should be used.
WARNING TO SERVICE PERSONNEL:
This service manual is intended for use by persons having electrical and mechanical training and a level of
knowledge of these subjects generally considered acceptable in the appliance repair trade. Sharp Electronics
Corporation cannot be responsible, nor assume any liability, for injury or damage of any kind arising from the
use of this manual.
SHARP ELECTRONICS CORPORATION
This document has been published to be used for after sales service only. The contents are subject to change without notice.
SERVICE MANUAL
MICROWAVE DRAWER
MODELS

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KB-6525PSY
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KB-6524PSY
S19M304KB6524Y
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Summary of Contents for Sharp KB-6524PSY

  • Page 1: Table Of Contents

    This service manual is intended for use by persons having electrical and mechanical training and a level of knowledge of these subjects generally considered acceptable in the appliance repair trade. Sharp Electronics Corporation cannot be responsible, nor assume any liability, for injury or damage of any kind arising from the use of this manual.

  • 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 Measure- ment 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

    KB-6525PSY KB-6524PSY WARNING TO SERVICE PERSONNEL Microwave Oven units 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, Heating Elements, etc..

  • Page 4: Microwave Measurement Procedure

    KB-6524PSY KB-6525PSY 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...

  • Page 5: Foreword And Warning

    MICROWAVE DRAWERS KB-6524PSY SCHEMATICS KB-6525PSY FOREWORD TEST PROCEDURE This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the MICROWAVE DRAWERS using the Standby Power Circuit. MICROWAVE DRAWER DISSASSEMBLY AND ADJUSTMENT PROCEDURE 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

    KB-6524PSY KB-6525PSY MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 14.5 Amperes, 1000 watts 60 Hz Single phase, 3 wire grounded Standby Power: 1 Watt Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions...
  • Page 7 KB-6525PSY KB-6524PSY GENERAL INFORMATION 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 accordance with the National Electrical Code and local codes and ordinances.
  • Page 8 KB-6524PSY KB-6525PSY OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions dur- 7. The monitor switch electrically monitors the operation of ing oven operation. the secondary interlock switch and secondary interlock relay and is mechanically associated with the drawer so OFF CONDITION that it will function in the following sequence.
  • Page 9 KB-6525PSY KB-6524PSY SENSOR COOKING CONDITION Using the SENSOR function, food is cooked without figur- 2. The coil of shut-off relay (RY-1) is energized, but the power transformer is not turned on. ing time, power level or quantity. When the oven senses 3.

  • Page 10: Schematics

    KB-6524PSY KB-6525PSY SCHEMATIC (OFF CONDITION) FUSE RESISTOR　470 kΩ 1/2W LINE CROSS CAPACITOR 1.0μF 275V NOISE SUPRESSION COIL LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR 0.0022μF 250V 0.0022μF 250V VRS1 HUMIDITY SENSOR Ｆ １ Ｆ ２ 〜 〜 Ｆ ３ Ｒ Ｙ ４...

  • Page 11: Troubleshooting Guide

    KB-6525PSY KB-6524PSY 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 KB-6524PSY KB-6525PSY CK = Check / RE = Replace E & Q TEST PROCEDURE REFERENCE LETTER Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and ":" or time of day should appear in display.) Oven seems to be operating but little or no heat is produced in oven load.

  • Page 13: Test Procedures

    KB-6525PSY KB-6524PSY 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 14 KB-6524PSY KB-6525PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4) Reconnect all leads removed from components during testing. 5) Re-install the covers. 6) Reconnect the power supply cord after the covers are installed. 7) Run the oven and check all functions.
  • Page 15 KB-6525PSY KB-6524PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER DEFROST TEST WARNING : The oven should be fully assembled before following procedure. (1) Place one cup of water in the center of the tray in the oven cavity. (2) Close the drawer, touch the Defrost pad. Then select Steaks/Chops by touching the number pad 2.
  • Page 16 KB-6524PSY KB-6525PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER AH SENSOR TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure. (1) The oven should be plugged in at least two minutes before sensor cooking.
  • Page 17 KB-6525PSY KB-6524PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9-2. Place the container on the center of tray in the oven cavity. 9-3. Close the drawer. 9-4. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice and the START pad once. And touch the number pad 1 once and the number pad 4 once.
  • Page 18 KB-6524PSY KB-6525PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Refer to the disassembly instructions found on Page 25. MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 19 KB-6525PSY KB-6524PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch.
  • Page 20 KB-6524PSY KB-6525PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE TEST 1. Disconnect the power supply cord. 2. Open the drawer and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds. 4. If the monitor fuse is blown when the drawer is opened, check the primary interlock switch, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 21 KB-6525PSY KB-6524PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER 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.
  • Page 22 KB-6524PSY KB-6525PSY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE CAPACITOR 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 capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter.
  • Page 23 KB-6525PSY KB-6524PSY HUMIDITY SENSOR CIRCUIT (1) Structure of Humidity Sensor the resistance values results in that there is the same The humidity sensor includes two thermistors as shown potential at both F-3 terminal of the absolute humidity in the illustration. One thermistor is housed in the closed sensor and AN6 terminal of the LSI.
  • Page 24 KB-6524PSY KB-6525PSY COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

  • Page 25: Microwave Drawer Disassembly

    KB-6525PSY KB-6524PSY MICROWAVE DRAWER DISASSEMBLY WARNING: Follow all safety precautions as stated at the beginning of this Service Manual before proceeding! 1. Open the Drawer to access the (4) mounting screws holding the unit on to the wall or cabinet opening. (Fig 1).
  • Page 26 KB-6524PSY KB-6525PSY 6. To remove the Control Panel Frame Assembly, C/P Cover remove the (1) screw holding the C/P cover, then unplug Control panel harness. Remove the (3) screws holding the Control Panel frame to faceplate (Fig 3). NOTE: THE ABOVE APPLIES TO CONTROL PANEL FRAME ASSEMBLIES AS STATED ON PAGE 39.
  • Page 27 KB-6525PSY KB-6524PSY STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install 1. Follow the Microwave Drawer disassembly as previously stated 1. Re-install each switch in its place. The secondary interlock 2. Open the drawer and keep it open. switch is in the lower position and the monitor switch is 3.
  • Page 28 KB-6524PSY KB-6525PSY DRAWER/SLIDE RAIL REMOVAL DRAWER ASSEMBLY AND CHOKE REMOVAL Fig. D-1 Open the drawer, remove Oven Tray and keep it open. 2. Remove (2) Drawer Support Covers from Choke Cover as shown in (Fig. D-1). 3. Remove (4) screws from both Door Support Angles A as shown in (Fig.
  • Page 29 KB-6525PSY KB-6524PSY DOOR LATCH REMOVAL 1. Follow the Microwave Drawer disassembly as previously stated 2. Open the drawer and keep it open. 3. To discharge the high voltage capacitor, wait for 60 seconds. 4. To remove latch, follow "DRAWER/SLIDE RAIL REMOVAL", then remove the (10) screws holding door panel to door frame (Fig.
  • Page 30 KB-6524PSY KB-6525PSY AUTO DRAWER GEAR REMOVAL/INSTALLATION (This procedure can be performed without removing the outercase) 1. If you are just replacing the Auto drawer Gear, it will not be necessary to follow the "Microwave Drawer Disassembly" as previously stated. 2. Turn the Drawer up on its back and knockout the Auto Drawer Gear hole cover (Fig. G-1).
  • Page 31 KB-6525PSY KB-6524PSY STIRRER MOTOR/FAN REMOVAL When servicing the Stirrer Fan it is very important not to bend any of the blades. The stirrer fan is used to circulate the microwaves from the top of the cavity. If the blade is bent, there is a...

  • Page 32: Wiring Diagrams

    KB-6524PSY KB-6525PSY Power Supply cord 120V 60Hz NOISE FILTER BOARD CN201 (SWITCHING POWER SUPPLY) CN101 MAGNETRON OVEN FUSE FUSE N.C. MONITOR COOLING SWITCH MOTOR COM. COM. N.O. N.O. (POWER SUPPLY) COM. STIRRER CN-A MOTOR SECONDARY COM. INTERLOCK SWITCH N.O. CN-F...

  • Page 33: Parts List

    AUTO DRAWER GEAR ASSY CABINET PARTS GCABUB218WRPZ OUTER CASE CABINET LANGQA830WRPZ AC CORD MOUNT ANGLE LANGTB363MRT0 SIDE ANGLE L 24” [KB-6524PSY] LANGTB364MRT0 SIDE ANGLE R 24” [KB-6524PSY] LANGTB346MRT0 SIDE ANGLE L 30” [KB-6525PSY] LANGTB347MRT0 SIDE ANGLE R 30” [KB-6525PSY] LBSHCA014WRE0...
  • Page 34 M4 X 8 SCREW - TAP PAN HEAD (R XHTS740P25000 SCREW 5-10 JHNDMB001MRK0 DOOR HANDLE [KB-6524PSY] 5-10 JHNDMB004MRK0 DOOR HANDLE [KB-6525PSY] 5-11 PSPA-B006MRF0 DOOR HANDLE MOUNT [KB-6524PSY] [KB-6525PSY] 5-12 XOTS740P12000 SCREW 5-13 FDORFA531WRYZ DOOR PANEL ASSY MISCELLANEOUS TINSEB518MRR2 OP MANUAL ASSY TINSEB519MRR0 INSTALLATION INSTRUCTIONS...
  • Page 35 KB-6525PSY KB-6524PSY DRAWER & CONTROL PANEL...
  • Page 36 KB-6524PSY KB-6525PSY DRAWER CAVITY 1-14 Knockout for Auto Drawer Gear Actual wire harness may be different from illustration. Replacement MICROWAVE DRAWER HARNESSES...
  • Page 37 KB-6525PSY KB-6524PSY DRAWER CABINET 6-10 7-13 Knockout for Oven lamp Replacement 7-13 7-13 7-13 7-13 7-13 7-13 7-13 KB6525P KB6524P 7-13 7-13 7-13 7-13 KB6524P KB6525P...

  • Page 38: Packing And Accessories

    KB-6524PSY KB-6525PSY PACKING PARTS OPERATION MANUAL Non-replaceable items INSTALLION SHEET WOOD SCREWS SUPPORT CORNERS CROSS SUPPORTS SUPPORT CORNERS TOP FOAM TOP FOAM SUPPORT CORNERS DRAWER SUPPORTS SUPPORT CORNERS BOTTOM FOAM PACKING CASE...
  • Page 39 KB-6525PSY KB-6524PSY NOTES...
  • Page 40 KB-6524PSY KB-6525PSY COPYRIGHT © 2016 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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