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Sharp R-2S56 Service Manual
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Sharp R-2S56 Service Manual

Sharp R-2S56 Service Manual

Microwave oven
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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 .......................................................................................................................................................... 7
TEST PROCEDURE ............................................................................................................................................ 9
TOUCH CONTROL PANEL ................................................................................................................................ 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 19
MICROWAVE MEASUREMENT ........................................................................................................................ 25
WIRING DIAGRAM ............................................................................................................................................. 26
PICTORIAL DIAGRAM ....................................................................................................................................... 28
CONTROL PANEL CIRCUIT .............................................................................................................................. 30
PRINTED WIRING BOARD ................................................................................................................................ 31
PARTS LIST ........................................................................................................................................................ 32
SERVICE MANUAL
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.

TABLE OF CONTENTS

SHARP CORPORATION
MICROWAVE OVEN
R-2S56
R-2S56
S7402R2S56PJZ
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  • Page 1: Table Of Contents

    R-2S56 SERVICE MANUAL S7402R2S56PJZ MICROWAVE OVEN R-2S56 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. TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION ........................ 1 WARNING ................................
  • Page 2 R-2S56...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN R-2S56 GENERAL IMPORTANT INFORMATION APPEARANCE VIEW This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. OPERATING SEQUENCE 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: Product Specifications

    R-2S56 PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 240 Volts (for Australia) / 230 - 240 Volts (for New Zealand) 50 Hertz Single phase, 3 wire earthed Power Consumption 1.06 kW, Approx. 4.5 A Power Output 700 watts nominal of RF microwave energy (IEC 705)

  • Page 5: Appearance View

    R-2S56 APPEARANCE VIEW 1. Ventilation opening 2. Oven lamp 3. Door hinges 4. Door safety latches 5. See through door 6. Coupling 7. Door open button 8. Touch control panel 9. Digital read-out 10.Wave guide cover 11.Power supply cord 4 12 12.Rating label...

  • Page 6: Operation Sequence

    R-2S56 OPERATION SEQUENCE OFF CONDITION The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch, Closing the door activates all door interlock switches 2nd. latch switch, and stop switch are made open. The (1st.

  • Page 7: Function Of Important Components

    R-2S56 FUNCTION OF IMPORTANT COMPONENTS the high voltage rectifier is shorted. DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel, When the open button is pushed, the switch lever on the latch hook is moved upward, operating the latch head.
  • Page 8 R-2S56 THERMAL CUT-OUT 95˚C FAN MOTOR FM The thermal cut-out protect the fan motor against overheat. The fan motor drives a blade which draws external cool air. If its temperature goes up higher than 95˚C because the fan This cool air is directed through the air vanes surrounding motor is locked or the ventilation openings are blocked, the the magnetron and cools the magnetron.

  • Page 9: Servicing

    3D checks and re-examine the connections to 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...
  • Page 10 R-2S56 CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E F G G G H H I J L M RE CKCKRECKCKCKCKCK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 11: Test Procedure

    R-2S56 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 CHECK. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
  • Page 12 R-2S56 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6. Measure the final water temperature. (Example: The final temperature T2 = 21 C) 7. Calculate the microwave power output P in watts from above formula. Initial temperature ....................T1 = 11 C Temperature after (60 + 2) = 62 sec.
  • Page 13 R-2S56 TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST Example Initial temperature ................T1 = 23˚C T2 = 24˚C Temperature after 2 min. 22 sec............T1 = 33˚C T2 = 34˚C Temperature difference Cold-Warm ..........T1 = 10˚C T2 = 10˚C Mean temperature rise T ......
  • Page 14 R-2S56 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER CARRY OUT 4R CHECKS. ASYMMETRIC RECTIFIER TEST ASYMMETRIC RECTIFIER CARRY OUT 3D CHECKS. HIGH VOLTAGE RECTIFIER Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric can be tested using an ohmmeter set to its highest range across the terminals A+B of the asymmetric rectifier and note the reading obtained.
  • Page 15 R-2S56 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER TEMPERATURE FUSE OR THERMAL CUT-OUT TEST CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the temperature fuse or thermal cut-out. Then using an ohmmeter, make a continuit test across the two terminals as described in the below.
  • Page 16 R-2S56 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
  • Page 17 R-2S56 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS APPROX. 19.0V D.C. Oven lamp / Turntable motor / Cooling fan motor APPROX. 18.0V D.C. Power transformer CARRY OUT 4R CHECKS. PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD...

  • Page 18: Touch Control Panel

    R-2S56 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOIUCH CONTROL PANEL Control Unit 4) Synchronizing Signal Circuit Control unit consists of tact switches, LSI, power source The power source synchronizing signal is available in circuit, synchronizing signal circuit, ACL circuit, buzzer order to compose a basic standard time in the clock circuit and indicator circuit.
  • Page 19 R-2S56 Pin No. Signal Description 7 -10 Digit selection signal. Refer to the touch control panel circuit about the relation between signals and digits. Normally, one pulse is output in every synchronized signal period, and input to the light -emitting diode.
  • Page 20 R-2S56 SERVICING 1. Precautions for Handling Electronic Components repair all the controls (sensor-related ones included) of This unit uses CMOS LSI in the integral part of the the touch control panel while keeping it connected to the circuits. When handling these parts, the following pre- oven.

  • Page 21: Component Replacement And Adjustment Procedure

    R-2S56 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect the oven from the power supply. 1. Door does not close firmly. 2. Make sure that a definite” click” can be heard when the 2.
  • Page 22 R-2S56 CONTROL PANEL REMOVAL 1. CARRY OUT 3D CHECKS. 4. Lift up the control panel and release if from the oven 2. Disconnect the leads from the control unit. cavity. 3. Remove the one (1) screw holding the control panel to 5.
  • Page 23 INTO THE OVEN AFTER CUTTING THE BRIDGES. Re-install BECAUSE IT WILL DAMAGE THE WIRE LEADS OF 1. Remove the any sharp edges on the turntable motor THE MOTOR AND IT IS DIFFICULT TO REMOVE IT cover and the bottom plate L with the cutting pliers.
  • Page 24 R-2S56 6. Re-connect the wire leads to the turntable motor. Washer 7. Insert the tab of the turntable motor cover into the hole Washer of the bottom plate as shown in Figure C-3(b). O-ring Apply the grease hear 8. Re-install the turntable motor cover to the bottom plate...
  • Page 25 R-2S56 Re-install POWER SUPPLY OVEN CAVITY CORD 1. Insert the moulding cord stopper of power supply cord BACK PLATE into the square hole of the rear cabinet, referring to the Figure C-5 (b). GREEN/YELLOW WIRE OVEN CAVITY 2. Install the earth wire lead of power supply cord to the EARTH ANGLE oven cavity with one (1) screw and tight the screw.
  • Page 26 R-2S56 DOOR REPLACEMENT AND ADJUSTMENT CHOKE COVER REMOVAL DOOR REPLACEMENT 1. Insert an iron plate(thickness of about 0.5mm) or flat type 1. CARRY OUT 3D CHECKS screw driver to the gap between the choke cover and 2. Remove two (2) screws holding the lower oven hinge to door panel as shown figure to free the engaging part.

  • Page 27: Microwave Measurement

    R-2S56 MICROWAVE MEASUREMENT standard for microwave ovens must be used for testing. Recommended instruments are: After adjustment of door latch switches, monitor switch and NARDA 8100 doorare completed individually or collectively, the following NARDA 8200 leakage test must be performed with a survey instrument and...

  • Page 28: Wiring Diagram

    R-2S56 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPERARS ON DISPLAY Figure O-1 Oven Schematic-OFF Condition (for Australia Model) Figure O-1 Oven Schematic-OFF Condition (for New Zealand Model)
  • Page 29 R-2S56 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME PROGRAMMED 3. "START" KEY TOUCHED Figure O-2 Oven Schematic-ON Condition (for Australia Model) Figure O-2 Oven Schematic-ON Condition (for New Zealand Model)

  • Page 30: Pictorial Diagram

    R-2S56 NEUTRAL...
  • Page 31 R-2S56...

  • Page 32: Control Panel Circuit

    R-2S56 LED71 (ANODE LED72 XOUT RESET INT2 5.1K 47µ/16V 0.1µ/50V 0.1µ/50V 10µ/35V 470µ/16V 0.01µ/50V VRS1...

  • Page 33: Printed Wiring Board

    R-2S56 ZD10 (ZD3) (R6) (J3) Figure S-3. Printed Wiring Board...

  • Page 34: Parts List

    R-2S56 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 1- 1 FH-DZA044WRK0 High voltage rectifier assembly...
  • Page 35 R-2S56 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 RRLY-A083DRE0 Relay (OMIF-S-118LM) SP40 RALM-A014DRE0 Buzzer (PKM22EPT) SW1-7 QSW-PA004DRE0 Tact switch (SKHHAK)
  • Page 36 R-2S56 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- 4 XVPSD40P20000 Screw; 4mm X 20mm 7- 5 XOTSD40P12000 Screw;...

  • Page 37: Oven And Cabinet Parts

    R-2S56 OVEN AND CABINET PARTS 4-20 7-10 7-11 for Australia 4-23 7-16 1-21 4-18 1-10 7-12 7-11 4-20 7-10 1-19 6-10 for New Zealand 4-14 4-21 7-11 1-20 7-12 4-19 7-10 4-10 7-10 7-10 4-16 1-16 4-13 4-22 4-26 4-15...
  • Page 38 R-2S56 CONTROL PANEL PARTS x 10 3-2-1 DOOR PARTS 7-13 7-13...

  • Page 39: Packing And Accessories

    R-2S56 MISCELLANEOUS Actual wire harness may be different than illustration. 80 ± 5 PACKING AND ACCESSORIES PAD HOLDER PACKING PAD KIT SPAKFA012WRE0 CPADBA165WRK0 DOOR PROTECTION SHEET SPADPA204WRE0 TURNTABLE TRAY POLYETHYLENG BAG SSAKHA014WRE0 OPERATION MANUAL COOK BOOK MICROWAVE OVEN ROLLER STAY...
  • Page 40 R-2S56 '94SHARP CORP. (07K0.920E) Printed in Australia...

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