Sharp R-244(W)M Service Manual
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Sharp R-244(W)M Service Manual

Sharp R-244(W)M Service Manual

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SERVICING ............................................................................................................................................. 2
CAUTION/WARNING ............................................................................................................................... 3
PRODUCT SPECIFICATIONS ................................................................................................................ 3
APPEARANCE VIEW................................................................................................................................ .4
OPERATION SEQUENCE ........................................................................................................................ 5
OUTPUT POWER TEST PROCEDURE ................................................................................................... 6
TEST PROCEDURES................................................................................................................................ 7
TOUCH CONTROL ASSEMBLY .............................................................................................................. 9
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................... 13
MICROWAVE MEASUREMENT PROCEDURE...................................................................................... 16
SCHEMATIC DIAGRAMS.........................................................................................................................17
PICTORIAL DIAGRAM .......................................................................................................................... 18
CONTROL PANEL CIRCUIT ................................................................................................................. 19
SWITCH UNIT CIRCUIT DIAGRAM ....................................................................................................... 20
PRINTED WIRING BOARD OF CONTROL PANEL DIAGRAM ............................................................. 21
PRINTED WIRING BOARD OF SWITCH UNIT DIAGRAM .................................................................... 22
PARTS LIST ........................................................................................................................................... 23
EXPLODED DIAGRAM OF OVEN .......................................................................................................... 26
CONTROL PANEL/DOOR PARTS ......................................................................................................... 27
PACKING AND ACCESSORIES ........................................................................................................... 28
SERVICE MANUAL
R
MODELS
R-244(W)M
R-244(G)M
R-244(B)M
R-244(SL)M
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
R-244M - 1
MICROWAVE OVEN
S40189R244M//
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Summary of Contents for Sharp R-244(W)M

  • Page 1: Table Of Contents

    SERVICE MANUAL S40189R244M// MICROWAVE OVEN MODELS R-244(W)M R-244(G)M R-244(B)M R-244(SL)M 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 Page SERVICING ............................. 2 CAUTION/WARNING ..........................

  • Page 2: Servicing

    Sharp recommend that wherever possible, fault-finding is carried out with the supply disconnected. In some cases, it may be necessary to connect the supply with the cover removed to carry out fault investigation in the control circuitry.

  • Page 3: Caution/Warning

    CAUTION / WARNING WARNING CAUTION MICROWAVE RADIATION Servicing and repair work must be carried out only by trained service engineers. Do not become exposed to radiation from the magnetron The parts marked '*' on the parts list and schematic or other parts conducting microwave energy. All input diagram have voltages in excess of 250V.

  • Page 4: Appearance View

    APPEARANCE VIEW OVEN 1. Door 2. Door hinges 3. Waveguide cover 4. Oven lamp 5. Control panel 6. Rubber seal 7. Door latch openings 8. Oven cavity 9. Door seals and sealing surfaces 10. Safety door latches 11. Ventilation openings 12.

  • Page 5: Operation Sequence

    OPERATING SEQUENCE DOOR OPEN MECHANISM OFF CONDITION The door can be opened by pulling the door. 1. When the oven door is opened, the oven lamp comes on at this time. Door MICROWAVE COOKING CONDITION Latch hook CONNECTED COMPONENTS RELAY Oven lamp, Fan motor, Turntable motor Power transformer SW3: Stop switch...

  • Page 6: Output Power Test Procedure

    The power output of this oven is rated using the method specified by IEC-60705. Full details of how to carry out this procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre (part number SERV-LITMW01).

  • Page 7: Test Procedures

    TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST Do not touch the electrical parts and the printed wiring board to prevent an electric CAUTION shock. Because the control unit is " TRANSLESS CIRCUIT " and all electrical parts are used at A.C.
  • Page 8 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SWITCH UNIT TEST If the display fails to clear when the STOP/CLEAR CN - C key is depressed, first verify the lead wire harness is making good contact, verify that the stop switch operates properly; that is the contacts are closed START when the door is closed and open when the door is AUTO MINUTE...

  • Page 9: Touch Control Assembly

    TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 4) Relay Circuit To drive the magnetron, fan motor, turntable motor and The touch control section consists of the following units. light the oven lamp. (1) Switch Unit 5) Buzzer Circuit (2) Control Unit The buzzer is responsive to signals from the LSI to emit audible sounds (tact switch touch sound and completion...
  • Page 10 DESCRIPTION OF LSI LSI(IXA085DR) The I/O signal of the LSI(IXA085DR) are detailed in the following table. Pin No. Signal Description 1-12 SEG0 - Segment data signal. SEG11 Connected to LCD. The relation between signals are as follows: LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.) SEG 0 (1) ........
  • Page 11 DESCRIPTION OF LSI LSI(IXA085DR) The I/O signal of the LSI(IXA085DR) are detailed in the following table Pin No. Signal Description Signal coming from tact switch. When either of tact switches SW5-SW8 is touched, a corresponding signal out of R60, R61, R62 and R63 will be input into R81. When no tact switch is touched, the signal is held at "H"...
  • Page 12 TOUCH CONTROL PANEL ASSEMBLY SERVICING 1. Precautions for Handling Electronic Components panel while keeping it connected to the oven. This unit uses CMOS LSI in the integral part of the circuits. B. On some models, the power supply cord between When handling these parts, the following precautions the touch control panel and the oven proper is so should be strictly followed.

  • Page 13: Component Replacement And Adjustment Procedure

    COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 2. Door hinge, support or latch hook is damaged. 1. CARRY OUT 3D CHECKS. 3. The door seal is damaged. 2.
  • Page 14 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE REMOVAL 4. Re-install the control panel assembly to the oven cavity 1. CARRY OUT 3D CHECKS. front flange. 2. Disconnect the wire leads from the switches and control 5. Re-connect wire leads to the control unit. Refer to panel.
  • Page 15 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE REMOVAL 1. Door latch heads smoothly catch latch hook through 1. Disconnect the power supply cord. latch holes and that latch head goes through center of 2. Open the door slightly. latch hole. 3. Remove the choke cover taking care not to break clips by inserting an iron plate (thickness of about 0.5mm) or 2.

  • Page 16: Microwave Measurement Procedure

    MICROWAVE MEASUREMENT After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335- 2-25 specifies that the maximum permitted leakage with a load of 275 ml is 50 W/m (equivalent to 5 mW/cm at a distance of 5 cm from the oven.

  • Page 17: Schematic Diagrams

    SCHEMATIC DIAGRAMS NOISE FILTER TC: OVEN THERMAL CUT-OUT 125˚C T: HIGH VOLTAGE TRANSFORMER WITH 150˚C THERMOSTAT F1: FUSE IN PRIMARY WINDING ( F8A) COM. N.O. RY-2 RY-1 H.V. CAPACITOR 0.88µF/ AC2100V N.O. SW3: STOP SWITCH N.C. COM. SW1: MONITORED SW2: MONITOR LATCH SWITCH SWITCH N.O.

  • Page 18: Pictorial Diagram

    PICTORIAL DIAGRAM R-244M -...

  • Page 19: Control Panel Circuit

    CONTROL PANEL CIRCUIT DIAGRAM R-244M - 19...

  • Page 20: Switch Unit Circuit Diagram

    SWITCH UNIT CIRCUIT DIAGRAM CN - C START AUTO MINUTE POWER WEIGHT STOP CLEAR 10min. 1min. DEFROST 10sec. COOK CN - C 6Pin HARNESS Figure S-3. Switch Unit Circuit R-244M -...

  • Page 21: Printed Wiring Board Of Control Panel Diagram

    PRINTED WIRING BOARD 0F CONTOL PANEL DIAGRAM LED1 LED2 LED3 CN - C (J6) (J4) (J2) (J3) (J5) (J7) (R60) (R61) (R62) (R63) (WH-1) ZD71 (J1) CN - A Figure S-3. Printed Wiring Board of Control unit R-244M - 21...

  • Page 22: Printed Wiring Board Of Switch Unit Diagram

    PRINTED WIRING BOARD OF SWITCH UNIT DIAGRAM Figure S-5. Printed Wiring Board of Switch Unit R-244M -...

  • Page 23: Parts List

    PARTS LIST The parts marked “*” are used in voltage more than 250V. The parts marked ∆ may cause undue microwave exposure Note: “§” MARK: SPARE PARTS-DELIVERY SECTION REF NO. PART NO. § DESCRIPTION Q'TY CODE ELECTRIC PARTS RH-DZA048WRE0 H.V. rectifier assembly RC-QZA297WRZZ High voltage capacitor QSW-MA146WRZZ...
  • Page 24 Control panel frame [R-244(B)M] 3- 3 HPNLCG024URR0 Control panel frame [R-244(G)M] 3- 3 HPNLCS030URR0 Control panel frame [R-244(SL)M] 3- 3 HPNLCW071URR0 Control panel frame [R-244(W)M] 3- 4 GCOVHA032URF0 Key fixing frame 3- 5 GMADIA006URF0 Display window 3- 6 PSHEPA045URE0 Key sheet [R-244(W)M]...
  • Page 25 PARTS LIST The parts marked “*” are used in voltage more than 250V. The parts marked ∆ may cause undue microwave exposure Note: “§” MARK: SPARE PARTS-DELIVERY SECTION REF NO. PART NO. § DESCRIPTION Q'TY CODE DOOR PARTS ∆ CDORFG014URK0 Door assembly (G) ∆...

  • Page 26: Exploded Diagram Of Oven

    EXPLODED DIAGRAM OF OVEN 7-10 1-16 7-10 1-15 4-11 1-13 1-11 1-14 4-10 1-17 7-14 7-15 1-18 4-12 4-13 NOTE: In the event of removing the turntable motor cover this part should be refitted using screw connection: LX-CZA030WRE0 R-244M -...

  • Page 27: Control Panel/Door Parts

    CONTROL PANEL / DOOR PARTS CONTROL PANEL PARTS 3 - 1 3-1E 3-1F 3 - 7 3 - 4 3 - 5 3-1D 3 - 7 3 - 6 3 - 3 3 - 2 3 - 7 DOOR PARTS R-244M - 27...

  • Page 28: Packing And Accessories

    PACKING & ACCESSORIES MISCELLANEOUS Actual wire harness may be different from illustration. COPYRIGHT C 2001 BY SHARP CORPORATION ALL RIGHT RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

This manual is also suitable for:

R-244(g)mR-244(b)mR-244(sl)m

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