Sharp R-204 Service Manual
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Sharp R-204 Service Manual

Sharp R-204 Service Manual

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See also: Operation Manual With Cookbook
CAUTION, MICROWAVE RADIATION .................................................................................................... 1
WARNING ................................................................................................................................................. 1
SERVICING ............................................................................................................................................. 2
PRODUCT SPECIFICATIONS ................................................................................................................. 5
GENERAL INFORMATION ....................................................................................................................... 5
APPEARANCE VIEW .............................................................................................................................. 6
OPERATION SEQUENCE ........................................................................................................................ 7
FUNCTION OF IMPORTANT COMPONENTS ....................................................................................... 8
TROUBLESHOOTING GUIDE ................................................................................................................. 9
TEST PROCEDURE .............................................................................................................................. 10
CONTROL PANEL ASSEMBLY ............................................................................................................ 15
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................. 18
WIRING DIAGRAM ................................................................................................................................ 25
PICTORIAL DIAGRAM .......................................................................................................................... 26
CONTROL PANEL CIRCUIT .................................................................................................................. 27
PRINTED WIRING BOARD .................................................................................................................... 28
PARTS LIST .......................................................................................................................................... 29
SERVICE MANUAL
0
30 30
11 11
25 25
12 12
20 20
13 13
15 15
14 14
800
560
400
240
MODEL
80
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
MICROWAVE OVEN
R-204(W)
R-204(W)
S8102R204PHW/
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Summary of Contents for Sharp R-204

  • Page 1: Table Of Contents

    R-204(W) SERVICE MANUAL S8102R204PHW/ MICROWAVE OVEN 30 30 11 11 25 25 12 12 20 20 13 13 15 15 14 14 R-204(W) MODEL 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: Caution Microwave Radiation

    R-204(W) CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, flanges and gaskets must be secured.

  • Page 3: Warning

    MICROWAVE OVEN R-204(W) GENERAL INFORMATION GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. APPEARANCE VIEW It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.
  • Page 4 Sharp beveelt ten sterkste aan dat, voor zover mogelijk, defecten worden opgespoord wanneer de stekker uit het Wanneer alle reparaties zijn uitgevoerd en de oven weer in stopcontact is gehaald.
  • Page 5 är kallt utför Du 3 steg kontroller och kontrollerar anslutningarna till varje enskild komponent på nytt. Sharp rekommenderar att felsökning sker med strömmen fränkopplad. Ibland kan det var nödvändigt att koppla på När all service är klar och ugnen ihopskruvad skall ugnens strömmen efter det att höljet avlägsnats, utför da 3 Steg...
  • Page 6 Sharp raccomanda, nei limiti del possibile, che la ricerca dei guasti avvenga in assenza di alimentazione elettrica. In alcuni casi tuttavia, può essere necessario alimentare Dopo aver portato a termine le operazioni di manutenzione l'apparecchio dopo aver rimosso la scatola esterna.

  • Page 7: Product Description

    R-204(W) PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 230 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.18 kW Power Output 800 W nominal of RF microwave energy (measured by method of IEC 60705) Operating fequency 2450 MHz...

  • Page 8: Appearance View

    R-204(W) APPEARANCE VIEW OVEN Turntable 1. Control panel 8. Door hinges 2. Door opening button 9. Door seals and sealing surfaces Roller stay 3. Waveguide cover 10.Safety door latches 4. Seal packing 11.Ventilation openings Seal packing 5. Oven cavity 12.Outer case 6.

  • Page 9: Operation Sequence

    R-204(W) OPERATION SEQUENCE OFF CONDITION control switch (SW3) are made open. Closing the door activates all door interlock switches (1st. 6. MONITOR SWITCH CIRCUIT interlock switch and 2nd. interlock relay control switch). The monitor switch (SW2) is mechanically controlled by oven door, and monitors the operation of the 1st.

  • Page 10: Function Of Important Components

    R-204(W) FUNCTION OF IMPORTANT COMPONENTS If the food load is overcooked, by either error in cook time DOOR OPEN MECHANISM or defect in the control unit, the temperature fuse will open. The door is opened by pushing the open button on the Under normal operation, the temperature fuse remains control panel, refer to the Figure D-1.

  • Page 11: Troubleshooting Guide

    R-204(W) TROUBLESHOOTING GUIDE When troubleshooting the microwave oven, it is helpful to IMPORTANT: If the oven becomes inoperative because follow the Sequence of Operation in performing the checks. of a blown fuse F1. Check the ist. interlock Many of the possible causes of trouble will require that a switch (SW1), monitor switch(SW2) and specific test be performed.

  • Page 12: Test Procedure

    R-204(W) 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 13 R-204(W) 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 14 R-204(W) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ...
  • Page 15 R-204(W) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER MEASURING POINTS INDICATION OF OHMMETER FUSE LINE CROSS CAPACITOR Between N and L Approx. 680 kΩ 0.068µ/AC250V Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit NOISE SUPPRESSION COIL If incorrect readings are obtained, replace the noise filter unit.
  • Page 16 R-204(W) TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST CARRY OUT 3D CHECKS. Remove the outer case and check voltage between Pin No. 3 of the 2 pin connector (A) and the common terminal of the relay RY2 on the control unit with an A.C. voltmeter.

  • Page 17: Control Panel Assembly

    R-204(W) CONTROL PANEL ASSEMBLY OUTLINE OF CONTROL PANEL Control Unit 5) Buzzer Circuit Control unit consists of LSI, power source circuit, synchro- The buzzer is responsive to signals from the LSI to emit nizing signal circuit, ACL circuit, buzzer circuit, encoder audible sounds (tact switch touch sound and comple- circuit, indicator circuit and potentiometer circuit.
  • Page 18 R-204(W) Pin No. Signal Description Magnetron high-voltage circuit driving signal. ON/OFF time ratio in Mi- cro cooking To turn on and off the cook relay (RY2). (a. 32second time base) The signal holds "L" level during MICRO microwave cooking and "H" level while COOK not cooking.
  • Page 19 R-204(W) SERVICING As for the sensor-related controls of the touch 1. Precautions for Handling Electronic Components control panel, checking them is possible if the This unit uses CMOS LSI in the integral part of the dummy resistor(s) with resistance equal to that circuits.

  • Page 20: Component Replacement And Adjustment Procedure

    Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures: WARNING FOR WIRING and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Oven cavity, Waveguide flange, other metallic 1. Before wiring, plate.
  • Page 21 R-204(W) MAGNETRON REMOVAL 1. CARRY OUT 3D CHECKS. 5. Now, the magnetron is free. 2. Disconnect the wire leads from magnetron. CAUTION: WHEN REPLACING THE MAGNETRON, 3. Remove the three (3) screws holding the magnetron to BE SURE THE R.F. GASKET IS IN PLACE the waveguide.
  • Page 22 R-204(W) TURNTABLE MOTOR REMOVAL Removal Re-install 1. Re-install the TTM packing. 1. Disconnect the oven from the power supply. 2. Re-install the turntable motor with theTTM packing 2. Remove the turntable and turntable support from the with the single (1) screw.
  • Page 23 R-204(W) POWER SUPPLY CORD REPLACEMENT Re-install Removal 1. Insert the moulding cord stopper of power supply cord 1. CARRY OUT 3D CHECKS. into the square hole of the rear cabinet, referring to the 2. Remove the single (1) screw holding the green/yellow Figure C-3 (b).
  • Page 24 R-204(W) After adjustment, check the following. 2. The 1st. interlock switch, 2nd. interlock relay control 1. In and out play of door remains less than 0.5mm when switch interrupt the circuit before the door can be in the latched position. First check upper position of opened.
  • Page 25 R-204(W) SEALER FILM Installation 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-7. 2. Tear the backing film by pulling the adhesive tape. 3. Put the pasted side of the sealer film on the door panel...

  • Page 26: Microwave Measurement

    R-204(W) MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of 1st. interlock switch, 2nd. interlock NARDA 8100 relay control switch, monitor switch and door are com- NARDA 8200 pleted individually or collectively, the following leakage HOLADAY HI 1500 test must be performed with a survey instrument and it...

  • Page 27: Test Data At A Glance

    R-204(W) TEST DATA AT A GLANCE PARTS SYMBOL VALUE / DATA Fuse M 8A 250V Temperature fuse (OVEN) 120°C Oven lamp 240–250 V 25W High voltage capacitor 0.91µF AC 2100V Filament < 1Ω / Filament – chassis ∞ ohm. Magnetron High voltage transformer Filament winding <...
  • Page 28 R-204(W)
  • Page 29 R-204(W)

  • Page 30: Printed Wiring Board

    R-204(W) JP15 JP16 JP17 JP23 Figure S-3. Printed Wiring Board...

  • Page 31: Parts List

    R-204(W) 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. DESCRIPTION Q'TY CODE ELECTRIC PARTS RC-QZA211WRE0 High voltage capacitor RC-QZA285WRZZ...
  • Page 32 R-204(W) ∆ 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 7- 7 XHPSD40P08000 Screw : 4mm x 6mm 7- 8...
  • Page 33 R-204(W) OVEN PARTS 4-11 4-10...
  • Page 34 R-204(W) CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 35: Packing And Accessories

    R-204(W) PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA459WRKZ DOOR PROTECT SHEET WRAP COVER SPADPA580WRE0 SSAKHA014WRE0 6-5 INSTRUCTION BOOK 6-1 TURNTABLE TRAY MICROWAVE OVEN BOTTOM PAD ASSEMBLY FPADBA460WRKZ 6-2 TURNRTABLE SUPPORT INTO THE OVEN CAVITY PACKING CASE Not replaceable items. SPAKCD635WREZ...
  • Page 36 R-204(W) '01 SHARP CORP. (8S1.31E) Printed in Germany...

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