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Sharp R-408DW Service Manual
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Sharp R-408DW Service Manual

Sharp microwave oven service manual
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R-410DW
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 ............................................................................................................................. 9
TEST PROCEDURE ........................................................................................................................................... 10
TOUCH CONTROL PANEL ................................................................................................................................18
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 22
PICTORIAL DIAGRAM ....................................................................................................................................... 28
POWER UNIT CIRCUIT ......................................................................................................................................29
CPU UNIT CIRCUIT ............................................................................................................................................30
PRINTED WIRING BOARD ................................................................................................................................31
PARTS LIST ........................................................................................................................................................32
PACKING AND ACCESSORIES ......................................................................................................................... 36
SHARP ELECTRONCS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
SERVICE MANUAL
MODELS
NO.
NO.
LBS.
LBS.
CUPS.
CUPS.
COOK
COOK
DEFOST
DEFOST
OZ.
OZ.
MINUTE PLUS
BEVERAGE
POPCORN
INSTANT ACTION
TO ADJUST QUANTITY - TOUCH PAD AGAIN
DINER
CASSEROLE
ROLLS&
PLATE
MUFFINS
BAKED
FRESH
GROUND
POTATOES
VEGETABLES
MEAT
FROZEN
FROZEN
M ICROWAVE
ENTREES
VEGETABLES
PIZZA
1 GROUND MEAT
2 STEAKS/CHOPS
3 CHICKEN PIECES
COMPU DEFROST
1
2
3
4
5
6
7
8
9
POWER
0
TIMER
LEVEL
CLOCK
STOP
START
CLEAR
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

MICROWAVE OVEN
R-408DW
R-410DK
R-410DW
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-408DW
R- 410DK
R-410DW
S30M142R410DE
Page

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Summary of Contents for Sharp R-408DW

  • Page 1: Table Of Contents

    PARTS LIST ................................32 PACKING AND ACCESSORIES ......................... 36 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-408DW R-410DK R-410DW 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-408DW R - 4 1 0 D K R-410DW 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...
  • Page 5 MICROWAVE OVEN R-408DW/R-410DK/R-410DW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICRO- OPERATION WAVE OVENS, R-408DW, R-410DK, R-410DW. It is recommended that service personnel carefully study the entire text of...

  • Page 6: General Information

    R-408DW R - 4 1 0 D K R-410DW SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts /14.6 Amperes/1650 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-408DW R-410DK R-410DW a qualified electrician and have it replaced with a properly grounded 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

    R-408DW R - 4 1 0 D K R-410DW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay and is mechanically associated with the door so that oven operation. it will function in the following sequence.

  • Page 9: Oven Schematic-Off Condition

    R-408DW R-410DK R-410DW Note:* Indicates component SCHEMATIC NOTE: CONDITION OF OVEN 1. Door Closed 2. CLOCK APPEARS ON DISPLAY MAGNETRON MONITOR TEMP. FUSE 20A FUSE COM. N.O. CAPACITOR 1.0µF AC 2300V (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CONTROL UNIT N.O. COM.

  • Page 10: Description And Function Of Components

    R-408DW R - 4 1 0 D K R-410DW DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM open, the monitor fuse blows simultaneously with closing of the monitor switch contacts. The door is opened by pushing the open button on the control CAUTION: BEFORE REPLACING A BLOWN MONITOR panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-408DW R-410DK R-410DW 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: Test Procedure

    R-408DW R - 4 1 0 D K R-410DW 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 TEST PROCEDURE...
  • Page 13 R-408DW R-410DK R-410DW 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. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.
  • Page 14 R-408DW R - 4 1 0 D K R-410DW 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.
  • Page 15 R-408DW R-410DK R-410DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA- TURE, REPLACE TEMPERATURE FUSE. SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 16 R-408DW R - 4 1 0 D K R-410DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed.
  • Page 17 R-408DW R-410DK R-410DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed.
  • Page 18 R-408DW R - 4 1 0 D K R-410DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Re-install the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions.
  • Page 19 R-408DW R-410DK R-410DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (5) If improper operation is indicated, the control unit is probably defective and should be checked. FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.

  • Page 20: Touch Control Panel

    R-408DW R - 4 1 0 D K R-410DW 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 21 R-408DW R-410DK R-410DW Pin No. Signal Description Back light circuit (Light emitting diodes) driving signal. 12-13 P56-P55 Terminal not used. CNTR0 Signal to sound buzzer (2.0 kHz). 0.1 sec. H : GND A: key touch sound. L : -5V B: Completion sound.
  • Page 22 R-408DW R - 4 1 0 D K R-410DW Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P41, P43, P44 and P45 terminal while one of G8 line keys on key matrix is touched.
  • Page 23 R-408DW R-410DK R-410DW TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components 5) Re-connect the power supply cord after the outer This unit uses CMOS LSI in the integral part of the case is installed. circuits. When handling these parts, the following 6) Run the oven and check all functions.

  • Page 24: 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 25: Pictorial Diagram

    R-408DW R-410DK R-410DW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN Special screw COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.
  • Page 26 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 27 R-408DW R-410DK R-410DW COOLING FAN MOTOR REMOVAL REMOVAL CAUTION: 1. Disconnect the power supply cord and then remove outer * Do not reuse the removed fan blade because the hole case. (for shaft) may be larger than normal. 2. Open the door and block it open.
  • Page 28 R-408DW R - 4 1 0 D K R-410DW 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/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT 1.
  • Page 29 R-408DW R-410DK R-410DW SEALER FILM 6. Re-install choke cover to door panel by pushing. Installation Note: After any service to the door; 1. Put the adhesive tape on the backing film of the sealer (A) Make sure that door sensing switch and secondary film as shown in Fig.
  • Page 30 NOTE: The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw. CAVITY TEMP. FUSE The screw must always be MAGNETRON TEMP. FUSE kept tight. DOOR N.O. SENSING CONTROL UNIT SWITCH POWER SUPPLY COM. CORD 120V 60Hz to Oven cavity (LSI UNIT)
  • Page 31 R-408DW R-410DK R-410DW CN-C S1NB10 9PIN LEAD WIRE HARNESS CN-A – OVEN LAMP TURNTABLE BUZZER MOTOR FAN MOTOR OVEN LAMP TURNTABLE MOTOR FAN MOTOR MICRO MICRO (BROWNER) DOOR SENSING SWITCH CN-B DOOR...

  • Page 32: Cpu Unit Circuit

    LIQUID CRYSTAL DISPLAY LSI UNIT LBS. CUPS COOK DEFROST AUTO R3 4.7k – LD1 LD2 LD3 LD4 2SA1037AK 2SA1037AK R4 560 1/2w (J10) (J11) 4.7k (J12) (J13) 4.7k (J14) (J15) 4.7k DTA143EKA (J16) (J17) 4.7k SEG8 SEG9 SEG10 SEG11 BUZZER SEG12 SEG13 SEG14...
  • Page 33 VEGETABLES R69 15k FROZEN POWER TIMER COMPU DINNER CASSEROLE POPCORN START ENTREES LEVEL CLOCK DEFROST PLATE R70 15k STOP BAKED FROZEN BEVERAGE POTATOES CLEAR VEGETABLES R71 15k R72 15k R73 15k KEY UNIT Figure S-3. CPU Unit Circuit For R-408DW...

  • Page 34: Printed Wiring Board

    R-408DW R - 4 1 0 D K R-410DW SW (GREEN) CN - C SH - B SH - A CN - B (D3) (D4) TTM FM BROWNER MICRO Figure S-5 . Printed Wiring Board of Power Unit...

  • Page 35: Parts List

    FPNLCB278MRK0 Control panel frame with key unit [R-410DK] 3- 2 FPNLCB279MRK0 Control panel frame with key unit [R-410DW] 3- 2 FPNLCB281MRK0 Control panel frame with key unit [R-408DW] 3- 2-1 FUNTKB223MRE0 Key unit [R-410DK] 3- 2-1 FUNTKB224MRE0 Key unit [R-410DW]...
  • Page 36 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 37: Oven And Cabinet Parts

    R-408DW R-410DK R-410DW OVEN AND CABINET PARTS 1-10 1-14 1-11 4-10 1-12 1-13 4-11...

  • Page 38: Control Panel Parts

    R-408DW R - 4 1 0 D K R-410DW CONTROL PANEL PARTS 3-2-1 3-2-2 DOOR PARTS 3-2-3 5-1-1 5-1-2 Actual wire harness may be different from illustration.

  • Page 39: Packing And Accessories

    R-408DW R-410DK R-410DW PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET PLASTIC BAG TRAY HOLDER 6-5 TURNTABLE TRAY 6-8 OPERATION MANUAL 6-4 TURNTABLE SUPPORT BOTTOM PAD ASSEMBLY TRAY PACK PACKING CASE None-Replaceable items...
  • Page 40 R-408DW R - 4 1 0 D K R-410DW Notes:...
  • Page 41 R-408DW R-410DK R-410DW Notes:...
  • Page 42 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. '2000 SHARP CORP. (3M3.20E) Printed in U.S.A...

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