Sharp SMD3070ASY Service Manual
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Sharp SMD3070ASY Service Manual

Microwave drawer model
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SMD3070ASY
MICROWAVE DRAWER MODEL
SMD2470ASY
THIS SERVICE MANUAL IS FOR MODELS USING THE STANDBY POWER CIRCUIT.
MODELS NOT USING STANDBY POWER, PLEASE REFER TO SERVICE MANUAL:
(SMD2470AS & SMD3070AS) -
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. BSH Home
Appliances 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 ............................................................................................................................................ 32
PARTS LIST ......................................................................................................................................................... 33
PACKING AND ACCESSORIES .......................................................................................................................... 39
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
S45M383SMD307

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SMD3070ASY
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SMD2470ASY
S45M383SMD307Y
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  • Page 1: Table Of Contents

    MICROWAVE DRAWER DISASSEMBLY ......................25 WIRING DIAGRAMS ............................32 PARTS LIST ................................. 33 PACKING AND ACCESSORIES .......................... 39 SHARP ELECTRONICS CORPORATION This document has been published to be used for after sales service only. The contents are subject to change without notice.

  • 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

    SMD3070ASY SMD2470ASY 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

    SMD2470ASY SMD3070ASY 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

    PRODUCT DESCRIPTION MICROWAVE DRAWER SMD2470ASY & SMD3070ASY SCHEMATICS FOREWORD TEST PROCEDURE This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the MICROWAVE DRAWER using the Standby Power Circuit. MICROWAVE DRAWER DISSASSEMBLY AND ADJUSTMENT PROCEDURE...

  • Page 6: Product Specifications

    SMD2470ASY SMD3070ASY 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 Width 17-11/32 Height 7-7/8"...
  • Page 7 SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY 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 SMD3070ASY SMD2470ASY 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

    SMD2470ASY SMD3070ASY 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

    SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY TROUBLESHOOTING CHART CK = Check / RE = Replace TEST PROCEDURE REFERENCE LETTER E & Q 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

    SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY 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 TEST PROCEDURES SMD3070ASY SMD2470ASY 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.
  • Page 16 SMD2470ASY SMD3070ASY 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.
  • Page 17 SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Refer to the disassembly instructions found on Page 22. 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 SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY 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 SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY 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 SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY 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

    SMD3070ASY SMD2470ASY 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 SMD2470ASY SMD3070ASY SMD2470AS CONTROL PANEL (C/P) REMOVAL 1. Open Door (Fig 3) 2. Remove side angles (R & L) 3. Remove 6 C/P cover screws (remove cover). 4. Lift C/P Assy up and tilt down to remove. 5. Careful not to scratch Faceplate and/or C/P, hold C/P facing down, open Hidden C/P, then unplug Molex Harness from CPU.
  • Page 27 SMD3070ASY SMD2470ASY 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.
  • Page 28 SMD2470ASY SMD3070ASY 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 29 SMD3070ASY SMD2470ASY 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 30 SMD2470ASY SMD3070ASY DOOR LATCH REMOVAL 1. Follow "DRAWER ASSEMBLY AND CHOKE REMOVAL" (steps 4-9) 2. Lay the door panel & door frame assembly front down on a protective surface. 3. Remove the (11) screws holding door panel to door frame (Fig. L-1).
  • Page 31 SMD3070ASY SMD2470ASY 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 32: Wiring Diagrams

    SMD2470ASY SMD3070ASY 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

    PCOVPA670WRPZ LATCH COVER CONTROL PANEL PARTS DPWBFB240MRU0 CPU- Drawer DPNLCB208MRK1 HIDDEN CONTROL PANEL HINGE ASSY (SMD2470ASY) DPNLCB212MRK1 HIDDEN CONTROL PANEL HINGE ASSY (SMD3070ASY) PMAG-B002MRE0A MAGNETIC STRIP PMAG-B003MRE0A ROUND MAGNET XEPS730P10XS0 M3 X 10 SCREW - STEEL P-TIGHT LX-CZB066MRE0 Screw- #4 x 1/3# Flathead SS...
  • Page 34 4-33 PHOK-A174WRFZ LATCH HOOK L 4-34 PCOVPA667WRPZ FACEPLATE OUTERCASE COVER DOOR PARTS FCOV-B533MRK0A DOOR FRAME ASSY (SMD2470ASY) FCOV-B541MRK0 DOOR FRAME ASSY (SMD3070ASY) FDORFA531WRYZ DOOR PANEL ASSY LSTPPB072MRF0 LATCH HEAD R LSTPPB073MRF0 LATCH HEAD L MSPRTB035MRE0 LATCH SPRING PSHEPB255MRE0 SEALER FILM...
  • Page 35 SMD3070ASY SMD2470ASY...
  • Page 36 SMD2470ASY SMD3070ASY DRAWER *NOTE: Screws 5-8 not included with 5-2...
  • Page 37 SMD3070ASY SMD2470ASY DRAWER CAVITY 1-14 Knockout for Auto Drawer Gear Actual wire harness may be different from illustration. Replacement MICROWAVE DRAWER HARNESSES...
  • Page 38 SMD2470ASY SMD3070ASY DRAWER CABINET 6-10 7-13 Knockout for Oven lamp Replacement 7-13 7-13 7-13 7-13 SMD3070AS 7-13 SMD2470AS 7-13 7-13 7-13 SMD2470AS SMD3070AS...

  • Page 39: Packing And Accessories

    SMD3070ASY SMD2470ASY 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 40 SMD2470ASY SMD3070ASY 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...

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