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Sharp R-120DB Service Manual
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Sharp R-120DB Service Manual

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STA RT/ MIN
UTE LUS
STO P/C LEA
ON DEF
LBS QTY
R
CHEC K
H A L
F
P IN T
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 .............................................................................................................................. 8
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 20
PICTORIAL DIAGRAM ........................................................................................................................................ 26
CONTROL PANEL CIRCUIT ............................................................................................................................... 27
PRINTED WIRING BOARD ................................................................................................................................. 28
PARTS LIST ........................................................................................................................................................ 29
PACKING AND ACCESSORIES ......................................................................................................................... 33
SHARP CORPORATION
SERVICE MANUAL
MODELS
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.
S3007R120DPW/
MICROWAVE OVEN
R-120DB
R-120DK
R-120DR
R-120DW
R-120DB
R-120DK
R-120DR
R-120DW
Page

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  • Page 1: Table Of Contents

    R-120DB R-120DK R-120DR R-120DW SERVICE MANUAL S3007R120DPW/ MICROWAVE OVEN R-120DB MODELS R-120DK STA RT/ MIN UTE LUS R-120DR STO P/C LEA ON DEF LBS QTY CHEC K R-120DW H A L P IN T 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.

  • 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 Measurement 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

    R-120DB R-120DK R-120DR R-120DW WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- Don't Touch ! ducing very high voltage and current, contact with Danger High Voltage following parts may result in a severe, possibly fatal, electrical shock.

  • Page 4: Microwave Measurement Procedure

    R-120DB R-120DK R-120DR R-120DW 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: Foreword And Warning

    PRODUCT DESCRIPTION MICROWAVE OVEN R-120DB/ R-120DK/ R-120DR/ R-120DW GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-120DB, R-120DK, R-120DR, R- 120DW. TROUBLESHOOTING GUIDE AND...

  • Page 6: Product Specifications

    R-120DB R-120DK R-120DR R-120DW PRODUCT DESCRIPTION SPECIFICATIONS ITEM DESCRIPTION Power Requirements 120 Volts 60 Hertz Single phase, 3 wire grounded Power Consumption 1030W / Approx. 9 Amperes Power Output 600 W nominal of RF microwave energy (IEC Test procedure) Operating frequency 2450 MHz Case Dimensions Width 14-3/8"...

  • Page 7: Oven Diagram

    R-120DB R-120DK R-120DR R-120DW Grounded Receptacle Box CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE- MOVE THE ROUND GROUNDING PRONG FROM THIS 3-Pronged PLUG. Plug Grounding Pin 3-Pronged Receptacle OVEN DIAGRAM 1. Oven door with see-through window 2. Safety door latches.

  • Page 8: Operation

    R-120DB R-120DK R-120DR R-120DW OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during filament and the H.V. winding voltage is sent to a voltage oven operation. doubler circuit. 4. The microwave energy produced by the magnetron is...

  • Page 9: Description And Function Of Components

    R-120DB R-120DK R-120DR R-120DW C/T FUSE MAGNETRON THERMAL CUT-OUT SCHEMATIC NOTE: CONDITION OF OVEN COM. POWER TRANSFORMER 1. DOOR OPENED. N.O. 2. COOKING TIME PROGRAMMED. 3. DOOR CLOSED. (RY-2) (RY-1) 4. START/MINUTE PLUS BUTTON PRIMARY INTERLOCK RELAY PUSHED. CAPACITOR CONTROL UNIT 0.72 F...

  • Page 10: Troubleshooting Guide

    R-120DB R-120DK R-120DR R-120DW C/T FUSE air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then 1. The C/T fuse blows when the contacts (COM-NO) of the exhausted through the exhausting air vents at the oven primary interlock relay (RY2) and secondary interlock cavity.
  • Page 11 R-120DB R-120DK R-120DR R-120DW CK = Check / RE = Replace A B C D E F F G H TEST PROCEDURE RE CK RE RE CK CK CK CK J POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle.

  • Page 12: Test Procedure

    R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY 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. 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.
  • Page 13 R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case.
  • Page 14 R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the secondary interlock switch.
  • Page 15 R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN C/T FUSE 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 C/T fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 16 R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up.
  • Page 17 R-120DB R-120DK R-120DR R-120DW 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 functions. COMPU COOK TEST (1) Place one cup of water in the center of the turntable tray in the oven cavity.

  • Page 18: Touch Control Panel

    R-120DB R-120DK R-120DR R-120DW TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7) Follow the troubleshooting guide given below for repair. STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between Pin No. 3 of the 2-pin connector (A) and the Check supply voltage and oven power cord.
  • Page 19 R-120DB R-120DK R-120DR R-120DW DESCRIPTION OF LSI LSI(IXA038DR) The I/O signal of the LSI(IXA038DR) are detailed in the following table. Pin No. Signal Description Power source voltage: -5V. VSS voltage of power source circuit input. Internal clock oscillation frequency setting input.
  • Page 20 R-120DB R-120DK R-120DR R-120DW Pin No. Signal Description 26-27 P16-17 Magnetron high-voltage circuit driving signal. H : GND To turn on and off the cook relay (RY2). The signals holds "L" level during micro- P-HI L : -5V wave cooking and "H" level while not cooking.
  • Page 21 R-120DB R-120DK R-120DR R-120DW SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the touch control panel and the oven itself is so short that the circuits.

  • Page 22: Component Replacement And Adjustment Procedure

    3. The door gasket or seal is damaged. 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 23 R-120DB R-120DK R-120DR R-120DW CAUTION: 1. DISCONNECT OVEN FROM POWER SUP- NOTE: When replacing the outer case, the 2 special PLY BEFORE REMOVING OUTER CASE. Torx screws must be reinstalled in the same 2. DISCHARGE THE HIGH VOLTAGE CA- locations.

  • Page 24: Turntable Motor Removal

    4. Cut the four (4) bridges holding the turntable motor cover Reinstallation to the bottom plate with the cutting pliers as shown in 1. Remove any sharp edges on the turntable motor cover Figure C-3. and the bottom plate with the cutting pliers.

  • Page 25: Cooling Fan Motor Removal

    R-120DB R-120DK R-120DR R-120DW the bottom plate as shown in Figure C-3. with screw XHTSD40P08RV0 7. Re-install the turntable motor cover to the bottom plate XFPSD40P08K00 as shown in Figure C-3. Screw: XHTSD40P08RV0 or Washer XFPSD40P08K00 Washer O-ring Apply grease here...

  • Page 26: Pictorial Diagram

    R-120DB R-120DK R-120DR R-120DW Shaft 10.Reinstall the barrier to the oven cavity by fitting the hooks of the barrier into the hols of the rear side of oven cavity. 11.Reinstall all wire leads released from the hole of the fan duct.

  • Page 27: Door Replacement

    R-120DB R-120DK R-120DR R-120DW DOOR REPLACEMENT REMOVAL 8. Re-install door stoper to door panel by pushing. 1. Disconnect the power supply cord. Note: After any service to the door; 2. Open the door slightly. (A) Make sure that door sensing switch, secondary 3.
  • Page 28 R-120DB R-120DK R-120DR R-120DW...
  • Page 29 R-120DB R-120DK R-120DR R-120DW 330pF/50v 330pF/50v 330pF/50v SEG2 SEG1 100k SEG0 COM3 100k COM2 COM1 100k COM0 AVDD VAREF AIN7 /25v 0.01 /25v 0.01 2SA933 HZ4C3 /25v 0.01 4.7k /25v 0.01 /16v /50v /25v /35v 3.3k /50v PKM22EPT TNR10G471K (J1)

  • Page 30: Printed Wiring Board

    R-120DB R-120DK R-120DR R-120DW -R70- (J1) (J1) TOP SIDE BOTTOM SIDE Figure S-3. Printed Wiring Board...

  • Page 31: Control Panel Circuit

    Turntable motor 1-11 RTHM-A117WRE0 Thermal cut-out 95˚C 1-12 RTRN-A606WRZZ Power transformer CABINET PARTS 2- 1 GCABUA754WRPZ Outer case cabinet [R-120DB] 2- 1 GCABUA763WRPZ Outer case cabinet [R-120DK] 2- 1 GCABUA765WRPZ Outer case cabinet [R-120DR] 2- 1 GCABUA761WRPZ Outer case cabinet [R-120DW]...
  • Page 32 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 33 R-120DB R-120DK R-120DR R-120DW OVEN AND CABINET PARTS 7-10 4-24 7-10 7-10 1-11 4-16 7-13 7-14 7-14 1-12 4-25 4-20 4-22 4-21 4-11 4-19 7-10 7-12 4-18 4-12 4-10 1-10 4-23 4-15 4-13 4-17 4-14 4-17 7-11...
  • Page 34 R-120DB R-120DK R-120DR R-120DW CONTROL PANEL PARTS 3-2-1 3-2-2 DOOR PARTS 5-10 5-10 5-10 5-10 MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 35: Packing And Accessories

    DOOR PROTECTION SHEET POLYETHYLENG BAG SPADPA580WRE0 SSAKHA006WRE0 6-3 OPERATION MANUAL 6-2 TURNTABLE TRAY MICROWAVE OVEN BOTTOM PAD ASSEMBLY FPADBA419WRKZ TURNRABLE SUPPORT INTO THE OVEN CAVITY PACKING CASE SPAKCD349WREZ [R-120DB] SPAKCD364WREZ [R-120DK] TRAY PAD ASSY SPAKCD365WREZ [R-120DR] (CPADBA269WRKZ) SPAKCD363WREZ [R-120DW] Not replaceable items.
  • Page 36 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 of the publisher. 2000 SHARP CORP. (3S2.530E) Printed in U.S.A...

This manual is also suitable for:

R-120dkR-120drR-120dw

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