Sharp SMD2440JS Service Manual
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Sharp SMD2440JS Service Manual

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MICROWAVE DRAWER MODEL
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.
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 3
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
SCHEMATICS ...................................................................................................................................................... 10
TROUBLE SHOOTING GUIDE.............................................................................................................................11
TEST PROCEDURES .......................................................................................................................................... 13
MICROWAVE DRAWER DISASSEMBLY ............................................................................................................ 25
WIRING DIAGRAMS ............................................................................................................................................ 33
PARTS LIST ......................................................................................................................................................... 34
PACKING AND ACCESSORIES .......................................................................................................................... 40
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

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SMD2440JS
S33M466MD244
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  • 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. TO ACCESS INTERNET: http://www.sharpusa.com/Support.aspx...

  • Page 3: Warning To Service Personnel

    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

    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 surface of the oven.

  • Page 5: Foreword And Warning

    SMD2440JS FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the MICROWAVE DRAWER. 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

    MICROWAVE DRAWER SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 14.5 Amperes, 60 Hz Single phase, 3 wire grounded Standby power: 1 Watt Power Output 950 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Cooking Cavity Dimensions Width 17-11/32 Height 7-7/8" 1.2 Cubic Feet Depth 16-1/2"...
  • Page 7 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. Grounded In the event of an electrical short circuit, grounding reduces the risk Receptacle Box...
  • Page 8 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 SENSOR COOKING CONDITION 2. The coil of shut-off relay (RY-1) is energized, but the Using the SENSOR function, food is cooked without figur- ing time, power level or quantity. When the oven senses power transformer is not turned on. 3. After about 16 seconds, the cook relay (RY-2) is enough steam from the food, it relays the information to its energized.

  • Page 10: Schematics

    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 ＦＭ Ｎ...

  • Page 11: Troubleshooting Guide

    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 TROUBLESHOOTING CHART 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

    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. In this service manual, the touch control panel assembly is divided into three units, Control Unit, Key- board Unit and Switching Power Supply, and troubleshooting by unit replacement is described according to the symptoms indicated.
  • Page 14 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. KEY UNIT TEST 1.
  • Page 15 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 12. Re-install the outer case (cabinet). 13. Reconnect the power supply cord after the outer case is installed. 14. Run the oven and check all function. 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.
  • Page 16 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9) Disconnect the power supply cord, and then remove outer case. 10) Open the door and block it open. 11) Discharge high voltage capacitor. 12) Reconnect all leads removed from components during testing. 13) Re-install the outer case (cabinet). 14) Reconnect the power supply cord after the outer case is installed.
  • Page 17 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 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. 4.
  • Page 19 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 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 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. 5.
  • Page 22 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 HUMIDITY SENSOR CIRCUIT (1) Structure of Humidity Sensor potential at both F-3 terminal of the absolute humidity The humidity sensor includes two thermistors as shown sensor and AN6 terminal of the LSI. The voltage of AN7 in the illustration. One thermistor is housed in the closed terminal will indicate about +2.5V.
  • Page 24 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 25: Microwave Drawer Disassembly

    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). 2.
  • Page 26 CONTROL PANEL (C/P) REMOVAL 1. Open Door (Fig 3) 2. Remove side angles (Right & Left), (8) screws total. 3. Lift C/P Assy up and tilt down to remove. 4. Careful not to scratch Faceplate and/or C/P, hold C/P facing down, then unplug Molex Harness from CPU.
  • Page 27 NOISE FILTER BOARD REPLACEMENT 1. Un-hook the black and white AC terminals from the Noise Filter PWB, plus the Red and double White terminals (Fig 4). 2. Remove the (1) screw holding the Noise Filter (Fig 4). 3. Reverse order to reinstall. Red Wire Fig.
  • Page 28 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 Open the drawer and keep it open. switch is in the lower position and the monitor switch is 3.
  • Page 29 DRAWER/SLIDE RAIL/CHOKE/DOOR FRAME REMOVAL DRAWER ASSEMBLY AND CHOKE REMOVAL Fig. D-1 Fig. D-2 Open the drawer, remove Oven Tray and keep it open. 2. Remove (2) Drawer Support Covers (both sides) from Choke Cover as shown in (Fig. D-1). Door 3.
  • Page 30 DOOR LATCH REMOVAL 1. Follow "DRAWER ASSEMBLY AND CHOKE REMOVAL" (steps 1-3) 2. At this point, you can change Latch Hooks/Springs without removing the Door Frame. 3. Unhook Latch Spring, then remove Latch Screw (Fig. L-1). 4. Proceed in reverse to reinstall. 5.
  • Page 31 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. (Fig. G-1). Turn the Drawer up on its back and knockout the Auto Drawer Gear hole cover 3.
  • Page 32 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 WARNING: possibility of one of the blades touching the top of the cavity and/or waveguide cover resulting in arcing or damaging the Magnetron.

  • Page 33: Wiring Diagrams

    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 CN-C OVEN LAMP CN-H CN-N TO DC...

  • Page 34: Parts List

    PARTS LIST REF. NO. PART NO. DESCRIPTION QTY CODE ELECTRICAL PARTS FC-QZA691WRKZ HVC ASSY DPWB-B836DRKZ PSU- Drawer DPWB-B698DRKZ SW PSU- Drawer FACCDA129WREZ POWER SUPPLY CORD FDTCTA272WRKZ SENSOR ASSY FMOTEB068MRK0 FAN MOTOR ASSY FPWBFA512WRKZ Noise Filter Unit QSW-MA169WRZZ MONITOR SWITCH RLMPTA099WRZZ OVEN LAMP WITH SOCKET 1-10 RMOTDA350WRZZ...
  • Page 35 REF. NO. PART NO. DESCRIPTION QTY CODE 4-22 PCOVPA667WRPZ FACEPLATE OUTERCASE COVER 4-23 PCUSGA884WRPZ AIR FLOW CUSHION 4-24 PCUSUA687WRPZ CUSHION 4-25 PDMP-B003MRE0 OIL DAMPER 4-26 PDUC-B141MRP0A MAG DUCT 4-27 PDUC-B191WRFZ SENSOR DUCT 4-28 PDUC-B192WRFZ EXHAUST DUCT 4-29 PFILWA066WRPZ LAMP FILTER 4-30 PSKR-A572WRPZ PARTITION AG BOTTOM...
  • Page 36 CONTROL PANEL...
  • Page 37 DRAWER...
  • Page 38 DRAWER CAVITY 1-14 Knockout for Auto Drawer Gear Actual wire harness may be different from illustration. Replacement MICROWAVE DRAWER HARNESSES...
  • Page 39 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 7-13...

  • Page 40: Packing And Accessories

    PACKING PARTS Non-replaceable items OPERATION MANUAL WOOD SCREWS SUPPORT CORNERS CROSS SUPPORTS SUPPORT CORNERS TOP FOAM TOP FOAM SUPPORT CORNERS DRAWER SUPPORTS SUPPORT CORNERS BOTTOM FOAM PACKING CASE...
  • Page 41 NOTES...
  • Page 42 NOTES...
  • Page 43 NOTES...
  • Page 44 COPYRIGHT © 2023 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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