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KB-6524PS/PK/PW
KB-6524PS pictured
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.
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the
following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High Voltage
Power Transformer, High Voltage Rectifier, Heat sink, Magnetron, and High Voltage Harness etc..)
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE ..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
SCHEMATICS ...................................................................................................................................................... 0
TEST PROCEDURES .......................................................................................................................................... 
MICROWAVE DRAWER DISASSEMBLY ............................................................................................................. 22
WIRING DIAGRAMS ............................................................................................................................................ 28
PARTS LIST ......................................................................................................................................................... 29
PACKING AND ACCESSORIES .......................................................................................................................... 34
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

TABLE OF CONTENTS

KB-6525PS/PK/PW
KB-6525PS pictured

KB-6525PS
KB-6525PK
KB-6525PW
S19M304KB6524
Page

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   Summary of Contents for Sharp KB-6524PS

  • 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 @-800-237-4277. If the unit operates with the door open, service person should ) 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-6525PS KB-6525PK KB-6525PW 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-6524PS KB-6524PK KB-6524PW MICROWAVE MEASUREMENT PROCEDURE A. Requirements: ) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed mW/cm at any point 5cm or more from the external surface of the oven, measured prior to...
  • Page 5: Foreword And Warning

    MICROWAVE DRAWERS SCHEMATICS KB-6524PS / KB-6524PK / KB-6524PW KB-6525PS / KB-6525PK / KB-6525PW FOREWORD TEST PROCEDURE This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the MICROWAVE DRAWERS. MICROWAVE DRAWER DISSASSEMBLY AND ADJUSTMENT PROCEDURE...
  • Page 6: Product Specifications

    KB-6524PS KB-6524PK KB-6524PW MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Requirements 20 Volts 4.5 Amperes, 000 watts 60 Hz Single phase, 3 wire grounded Power Output 000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions KB6524 Width 7-/32...
  • Page 7: General Information

    KB-6525PS KB-6525PK GENERAL INFORMATION KB-6525PW 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-6524PS OPERATION KB-6524PK KB-6524PW 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-6525PS KB-6525PK KB-6525PW SENSOR COOKING CONDITION Using the SENSOR function, food is cooked without figur- 2. The coil of shut-off relay (RY-) is energized, but the power transformer is not turned on. ing time, power level or quantity. When the oven senses 3.
  • Page 10 KB-6524PS SCHEMATIC (OFF CONDITION) KB-6524PK KB-6524PW FUSE RESISTOR 470 kΩ 1/2W LINE CROSS CAPACITOR 1.0μF 275V NOISE SUPRESSION COIL LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR 0.0033μF 250V 0.0033μF 250V HUMIDITY SENSOR F 1 F 2 ∼ ∼ F 3 R Y 4...
  • Page 11 KB-6525PS KB-6525PK TEST PROCEDURES KB-6525PW 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 12 KB-6524PS KB-6524PK TEST PROCEDURES KB-6524PW 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 13 KB-6525PS KB-6525PK KB-6525PW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 2. Re-install the outer case (cabinet). 3. Reconnect the power supply cord after the outer case is installed. 4. Run the oven and check all function. DEFROST TEST WARNING : The oven should be fully assembled before following procedure. () Place one cup of water in the center of the tray in the oven cavity.
  • Page 14 KB-6524PS KB-6524PK KB-6524PW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER ) Discharge high voltage capacitor. 2) Reconnect all leads removed from components during testing. 3) Re-install the outer case (cabinet). 4) Reconnect the power supply cord after the outer case is installed.
  • Page 15 KB-6525PS KB-6525PK KB-6525PW 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  once and the number pad 4 once.
  • Page 16 KB-6524PS KB-6524PK TEST PROCEDURES KB-6524PW PROCEDURE COMPONENT TEST LETTER Refer to the disassembly instructions found on Page 22. MAGNETRON ASSEMBLY TEST . Disconnect the power supply cord. 2. Open the drawer and keep it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
  • Page 17 KB-6525PS KB-6525PK KB-6525PW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SECONDARY INTERLOCK SWITCH TEST . 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 18 KB-6524PS KB-6524PK KB-6524PW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE TEST . 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 19 KB-6525PS KB-6525PK KB-6525PW 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 20 KB-6524PS KB-6524PK KB-6524PW PRECAUTIONS FOR USING LEAD-FREE SOLDER 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 21 KB-6525PS KB-6525PK KB-6525PW 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.. WARNING: To Avoid possible exposure to microwave energy, please follow the instructions below before servicing the oven.
  • Page 22: Test Procedures

    KB-6524PS KB-6524PK MICROWAVE DRAWER DISASSEMBLY KB-6524PW WARNING: Follow all safety precautions as stated at the beginning of this Service Manual before proceeding! . Open the Drawer to access the (4) mounting screws holding the unit on to the wall or cabinet opening. (Fig 1).
  • Page 23 KB-6525PS KB-6525PK KB-6525PW 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). 7. After the Control panel frame is removed, you now have access to the CPU board.
  • Page 24 KB-6524PS KB-6524PK KB-6524PW STOP SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL Re-install . Follow the Microwave Drawer disassembly as previously stated . Re-install each switch in its place. The secondary interlock 2. Open the drawer and keep it open.
  • Page 25 KB-6525PS DRAWER/SLIDE RAIL REMOVAL KB-6525PK KB-6525PW DRAWER ASSEMBLY AND CHOKE REMOVAL Fig. D-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.
  • Page 26 KB-6524PS KB-6524PK KB-6524PW DOOR LATCH REMOVAL . 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 27 KB-6525PS KB-6525PK KB-6525PW AUTO DRAWER GEAR REMOVAL/INSTALLATION (This procedure can be performed without removing the outercase) . If you are just replacing the Auto drawer Gear, it will not be necessary to follow the "Microwave Drawer Disassembly" as previously stated. 2.
  • Page 28: Wiring Diagrams

    KB-6524PS KB-6524PK KB-6524PW Power Supply cord 120V 60Hz NOISE FILTER BOARD 5 BLK CN201 (SWITCHING POWER SUPPLY) CN201 CN101 MAGNETRON OVEN THERMAL THERMAL CUT-OUT CUT-OUT N.C. MONITOR COOLING SWITCH MOTOR COM. CN101 N.O. N.O. COM. (POWER SUPPLY) COM. STIRRER MOTOR SECONDARY N.O.
  • Page 29: Parts List

    FW-VZB350MRE0 DRAWER HARNESS 1-15 QSW-MA085WRE0 Secondary interlock switch / Door sensing switch 1-16 FANGTB020MRK0 AUTO DRAWER GEAR ASSY CABINET PARTS 2-1 GCABUB163MRP0 OUTER CASE CABINET 2-2 LANGQB085MRP0 AC CORD MOUNT ANGLE 2-3 LANGTB250MRT0 SIDE ANGLE 24” [KB-6524PS/PK/PW] 2-3 LANGTB260MRT0 SIDE ANGLE 30” [KB-6525PS/PK/PW] 2-4 LBSHC0037WRE0 CORD BUSHING CONTROL PANEL PARTS 3-1 DPWBFB172MRU0 CPU- Drawer 3-2 FPNLCB625MRK0 C/P FRAME ASSY 24”[KB-6524PS] 3-2 FPNLCB626MRK0 C/P FRAME ASSY 24”[KB-6524PK] 3-2 FPNLCB627MRK0 C/P FRAME ASSY 24”[KB-6524PW]...
  • Page 30 KB-6524PS KB-6524PK KB-6524PW REF. NO. PART NO. DESCRIPTION Q'TY CODE 4-27 PDUC-B182MRF0 SENSOR DUCT 4-28 PDUC-B183MRF0 EXHAUST DUCT 4-29 PFILWB005MRP0 LAMP FILTER 4-30 PSKR-B026MRP0 PARTITION AG BOTTOM 4-31 PSKR-B027MRP0 PARTRITION AG REAR 4-32 PHOK-B030MRF0 LATCH HOOK R 4-33 PHOK-B031MRF0 LATCH HOOK L DOOR PARTS 5-1 DDORFB145MRK0 DOOR ASSY 24” [KB-6524PS] 5-1 DDORFB146MRK0 DOOR ASSY 24” [KB-6524PK]...
  • Page 31 KB-6525PS KB-6525PK KB-6525PW DRAWER & CONTROL PANEL Must be placed behind middle tab behind Control Unit.
  • Page 32 KB-6524PS KB-6524PK KB-6524PW DRAWER CAVITY 1-14 Knockout for Auto Drawer Gear Actual wire harness may be different from illustration. Replacement MICROWAVE DRAWER HARNESSES...
  • Page 33 KB-6525PS KB-6525PK KB-6525PW DRAWER CABINET 7-13 Knockout for Oven lamp Replacement 7-13 7-13 7-13 7-13 7-13 7-13 7-13 KB6525P KB6524P 6-10 7-13 7-13 7-13 KB6524P KB6525P...
  • Page 34: Packing And Accessories

    KB-6524PS KB-6524PK KB-6524PW 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 35 KB-6525PS KB-6525PK KB-6525PW NOTES...
  • Page 36 KB-6524PS KB-6524PK KB-6524PW COPYRIGHT © 2009 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...

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