Sharp R-230F Service Manual
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Sharp R-230F Service Manual

Sharp R-230F Service Manual

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CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 5
SERVICING ....................................................................................................................................................... 6
TEST PROCEDURE ......................................................................................................................................... 8
TOUCH CONTROL PANEL ............................................................................................................................. 13
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 17
MICROWAVE MEASUREMENT .................................................................................................................... 23
WIRING DIAGRAM ......................................................................................................................................... 24
PICTORIAL DIAGRAM ................................................................................................................................... 25
CONTROL PANEL CIRCUIT ........................................................................................................................... 26
PRINTED WIRING BOARD ............................................................................................................................. 27
PARTS LIST ................................................................................................................................................... 27
SERVICE MANUAL
MODEL
1.Fish Fillets 2.Chicken Fillets
1.Steak/Chops 2.Roast Meat
3.Sausages / Minced Meat
3.Poultry 4.Chicken Pieces
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.

TABLE OF CONTENTS

SHARP CORPORATION
31
MICROWAVE OVEN
R-230F
R-230F
S1202R230FPJ/
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  • Page 1: Table Of Contents

    R-230F SERVICE MANUAL S1202R230FPJ/ MICROWAVE OVEN R-230F MODEL 1.Fish Fillets 2.Chicken Fillets 1.Steak/Chops 2.Roast Meat 3.Sausages / Minced Meat 3.Poultry 4.Chicken Pieces In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
  • Page 2 R-230F...

  • Page 3: Caution Microwave Radiation

    PRODUCT SPECIFICATIONS R-230F GENERAL IMPORTANT INFORMATION APPEARANCE VIEW This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the OPERATING SEQUENCE entire text of this manual, so they will be qualified to render satisfactory customer service.

  • Page 4: Product Specifications

    R-230F PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.21 kW Power Output 800 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions...

  • Page 5: Appearance View

    R-230F APPEARANCE VIEW OVEN 10 4 1. Door open button 6. Door seals sealing surfaces 11. Power supply cord 2. Oven lamp 7. Coupling 12. Ventilation openings 3. Door hinges 8. Control panel 13. Turntable 4. Door safety latches 9. Liquid crystal display 14.

  • Page 6: Operation Sequence

    R-230F OPERATION SEQUENCE OFF CONDITION The oven lamp remains on even if the oven door is Closing the door activates all door interlock switches opened after the cooking cycle has been interrupted, (1st. latch switch, 2nd. interlock relay control switch).

  • Page 7: Function Of Important Components

    R-230F FUNCTION OF IMPORTANT COMPONENTS TEMPERATURE FUSE DOOR OPEN MECHANISM The temperature fuse, located on the top of the oven The door is opened by pushing the open button on the cavity, is designed to prevent damage to the oven by fire.

  • Page 8: Servicing

    3D checks and re-examine the connections to screwdriver. the component being tested. Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may, in some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer.
  • Page 9 R-230F CK = Check / RE = Replace TEST PROCEDURE A B C D E E E F G G H K M N I L J RECKCKRE CKCKCKCKCK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 10: Test Procedure

    R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS. Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal.
  • Page 11 R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Room temperature ....... To = 21˚C Initial temperature ....T1 = 11°C Temperature after (52 + 3) = 55 sec..............T2 = 21°C Temperature difference Cold-Warm ..............∆T1 = 10°C Measured output power The equation is “P = 80 x ∆T”...
  • Page 12 R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.
  • Page 13 R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER FUSE T6.3A CARRY OUT 3D CHECKS. If the fuse T6.3A is blown when the door is opened, check the 1st latch switch, 2nd. interlock relay control switch, monitor switch and 2nd. interlock relay RY2.
  • Page 14 R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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. g) The figure of all digits flicker.

  • Page 15: Touch Control Panel

    R-230F TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION The rated voltage is not applied between Pin No. 3 of the 2 pin connector (A) and the Check supply voltage and oven power cord. normal open terminal of the relay RY2.
  • Page 16 R-230F DESCRIPTION OF LSI The I/O signal of the LSI are detailed in the following table. Pin No. Signal Description Auto clear terminal. RESET Signal is input to reset the LSI to the initial state when power is supplied. TEST Connected to GND.
  • Page 17 R-230F Pin No. Signal Description Signal similar to K02. When either G8 line on key matrix is touched, a corresponding signal will be input into K00. Signal similar to K02. When either G9 line on key matrix is touched, a corresponding signal will be input into K01.
  • Page 18 R-230F SERVICING 1. Precautions for Handling Electronic Components For those models, therefore, it is possible to This unit uses CMOS LSI in the integral part of the check and repair the controls of the touch control circuits. When handling these parts, the following pre- panel while keeping it apart from the oven proper;...

  • Page 19: Component Replacement And Adjustment Procedure

    WARNING FOR WIRING To prevent an electric shock, take the following and Oven cavity. manners. 3) Sharp edge: 1. Before wiring, Oven cavity, Waveguide flange, other metallic 1) Disconnect the power supply. plate. 2) Open the door and wedge the door open.
  • Page 20 R-230F 3. Remove the three (3) screws holding the magnetron to CAUTION: WHEN REPLACING THE MAGNETRON, the waveguide. BE SURE THE R.F. GASKET IS IN PLACE 4. Remove the magnetron from waveguide. AND THE MAGNETRON MOUNTING 5. Now, the magnetron is free.
  • Page 21 R-230F 6. Tear away the membrane switch from the control panel ribbon cable (edge) and the rubber connector frame. directly with your fingers. This is to avoid oxidized. Installation Control panel frame 1. Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol.
  • Page 22 R-230F • Do not touch the pliers to the coil of the fan motor 3. Hold the center of the bracket which supports the shaft because the coil may be cut or injured. of the fan motor on the flat table.
  • Page 23 R-230F 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH REMOVAL and monitor switch are in the lower position and the 1. CARRY OUT 3D CHECKS. 2nd. interlock relay control switch is in the upper 2. Disconnect wire leads from the switches.
  • Page 24 R-230F 10.Now, door panel with sealer film is free. cycle. This function does not require that door be 11.Tear sealer film from door panel. air-tight, moisture (condensation)-tight or light- tight. Therefore, occasional appearance of mois- 12.Now, door panel is free.

  • Page 25: Microwave Measurement

    R-230F MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the NARDA 8100 following leakage test must be performed with a survey NARDA 8200 HOLADAY HI 1500 instrument and it must be confirmed that the result meets...

  • Page 26: Wiring Diagram

    R-230F SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potential above 250V. NOISE FILTER N.O. COM. RY-2 2ND. RY-1 INTERLOCK RELAY CONTROL UNIT 2ND. INTERLOCK RELAY CONTROL SWITCH 1ST. LATCH...

  • Page 27: Pictorial Diagram

    R-230F...

  • Page 28: Control Panel Circuit

    R-230F...

  • Page 29: Printed Wiring Board

    R-230F CHIP UNIT CN-B SIDE CODE (J1) Figure S-3. Printed Wiring Board PARTS LIST ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO.
  • Page 30 R-230F ∆ Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE OVENPARTS ∆ 4- 1 PHOK-A122WRFZ Latch hook 4- 2...
  • Page 31 R-230F OVEN AND CABINET PARTS 4-13 1-13 4-11 1-12 4-12 1-10 4-10 1-11 1-14 1-10...
  • Page 32 3-1-1 MISCELLANEOUS Actual wire harness may be different than illustration. 3-1-2 COPYRIGHT © 2002 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 of the publisher.

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