Sharp R-405DK Service Manual
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Sharp R-405DK Service Manual

Sharp R-405DK Service Manual

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R-405DK
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
MODEL
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

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
S50M143R405DE
MICROWAVE OVEN
R-405DK
R- 405DK
Page

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Summary of Contents for Sharp R-405DK

  • 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-405DK 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 - 4 0 5 D K 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

    MICROWAVE OVEN R-405DK 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 OVEN, R-405DK. It is recommended that service personnel carefully study the entire text of...

  • Page 6: Product Specifications

    R - 4 0 5 D K SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts/13.0 Amperes/1450 Watts 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC 705 TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 21-21/32" Height 12-3/8" Depth 18-7/16"...
  • Page 7 R-405DK 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 - 4 0 5 D K 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. (1) When the door opens from the closed position, the OFF CONDITION primary interlock relay (RY2) and secondary interlock...
  • Page 9 R-405DK 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 .94µF AC 2300V (RY-2) (RY-1) PRIMARY INTERLOCK RELAY CONTROL UNIT N.O. COM. 120V AC...
  • Page 10 R - 4 0 5 D K 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-405DK 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 - 4 0 5 D K 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 PROBLEM CONDITION Home fuse or circuit breaker blows when power cord is plugged into wall...
  • Page 13 R-405DK 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 - 4 0 5 D K 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. 4.
  • Page 15 R-405DK 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. 2. Open the door and block it open.
  • Page 16 R - 4 0 5 D K 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. 8.
  • Page 17 R-405DK 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 - 4 0 5 D K 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. Key Unit RELAY TEST 1.
  • Page 19 R-405DK 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 - 4 0 5 D K 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. (1) Key Unit In addition, the synchronizing signal is available in order (2) Control Unit (The Control Unit consists of Power Unit and...
  • Page 21 R-405DK 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 - 4 0 5 D K 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. Key strobe signal.
  • Page 23 R-405DK 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 R-405DK CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. Special screw 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-405DK 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 - 4 0 5 D K 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-405DK 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: Pictorial Diagram

    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: Power Unit Circuit

    R-405DK 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: Printed Wiring Board

    R-405DK 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 34: Parts List

    RTRNPA110DRE0 Transformer (Interchangeable) VRS1 RH-VZB001MRE0 Varistor (470ND-10D) VRS1 RH-VZA032DRE0 Varistor (10G471K) (Interchangeable) 3- 2 FPNLCB280MRK0 Control panel frame with key unit [R-405DK] 3- 2-1 FUNTKB225MRE0 Key unit [R-405DK] 3- 2-2 JBTN-B092MRF0 Open button [R-405DK] 3- 2-3 MSPRTA050WRE0 Open button spring...
  • Page 35 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 36 R - 4 0 5 D K OVEN AND CABINET PARTS 1-10 1-14 1-11 4-10 1-12 1-13 4-11...
  • Page 37 R-405DK 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 38: Packing And Accessories

    R - 4 0 5 D K 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 39 R-405DK Notes:...
  • Page 40 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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