Sharp R-3S68 Service Manual
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Sharp R-3S68 Service Manual

Sharp R-3S68 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 ................................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 18
MICROWAVE MEASUREMENT ........................................................................................................................ 24
WIRING DIAGRAM ............................................................................................................................................. 25
PICTORIAL DIAGRAM ....................................................................................................................................... 26
CONTROL PANEL CIRCUIT ............................................................................................................................... 27
PRINTED WIRING BOARD ................................................................................................................................. 28
PARTS LIST ....................................................................................................................................................... 29
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-3S68
R-3S68
S3612R3S68PX/
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  • Page 1: Table Of Contents

    R-3S68 SERVICE MANUAL S3612R3S68PX/ MICROWAVE OVEN R-3S68 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-3S68...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN R-3S68 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-3S68 PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 220 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.37kW Power Output 850 watts nominal of RF microwave energy (IEC 705) Operating fequency 2450 MHz Case Dimensions Width 520 mm Height 305 mm including foot...

  • Page 5: Appearance View

    R-3S68 APPEARANCE VIEW 1. Ventilation openings 2. Oven lamp 3. Door hinges 4. Door safety latches 5. See through door 6. Door seals and sealing surfaces 7. Coupling 8. Door open button 9. Touch control panel 10.Digital readout 11.Wave guide cover 12.Power supply cord...

  • Page 6: Operation Sequence

    R-3S68 OPERATION SEQUENCE OFF CONDITION The circuits to the power transformer, fan motor and turntable motor are cut off when the 1st. latch switch and Closing the door activates all door interlock switches (1st. 2nd. interlock relay control switch are made open. The latch switch and 2nd.

  • Page 7: Function Of Important Components

    R-3S68 FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM FUSE M8A The door is opened by pushing the open button on the 1. The fuse M8A blows when the contacts (COM-NO) of the control panel, refer to the Figure D-1. 1st. latch switch and 2nd. interlock relay remain closed...

  • Page 8: 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 9 R-3S68 CK = Check / RE = Replace TEST PROCEDURE A B C D E E E G F F H H I K L M N RECKCKRE CK CKCKCK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM CONDITION Home fuse blows when power supply cord is plugged into wall outlet.

  • Page 10: Test Procedure

    R-3S68 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 11 R-3S68 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 (49 + 2) = 51 sec..............T2 = 21°C Temperature difference Cold-Warm..............
  • Page 12 R-3S68 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER CARRY OUT 4R CHECKS. HIGH VOLTAGE RECTIFIER NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
  • Page 13 R-3S68 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER MONITOR RESISTOR TEST CARRY OUT 3D CHECKS. Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor. The resistance of monitor resistor is approx. 0.8 ohms.
  • Page 14 R-3S68 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER 2-2 In connection with indicators a) At a certain digit, all or some segments do not light up. b) At a certain digit, brightness is low. c) Only one indicator does not light.
  • Page 15 R-3S68 TEST PROCEDURES (CONT'D) PROCEDURE COMPONENT TEST LETTER PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse.

  • Page 16: Touch Control Panel

    R-3S68 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 5) ACL Circuit Control Unit A circuit to generate a signals which resets the LSI to the Control unit consists of tact switches, LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer initial state when power is supplied.
  • Page 17 R-3S68 DESCRIPTION OF LSI LSI(IZA677DR) The I/O signal of the LSI(IZA677DR) is detailed in the following table. Pin No. Signal Description XOUT Internal clock oscillation frequency control output. Output to control oscillation input of X Internal clock oscillation frequency input setting.
  • Page 18 R-3S68 Pin No. Signal Description Segment data signal. Signal similar to R70. Switch strobe signal. Signal applied to tact switch section. A pulse signal is input to R81, R82 and R83 terminal while one of diode D58 line switches on switch matrix is touched.
  • Page 19 R-3S68 SERVICING 1. Precautions for Handling Electronic Components B. 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 proper is long enough circuits. When handling these parts, the following pre- that they may be separated from each other.

  • Page 20: Component Replacement And Adjustment Procedure

    R-3S68 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect oven from power supply. 1. Door does not close firmly. 2. Make sure that a definite” click” can be heard when the 2.
  • Page 21 R-3S68 Re-install 4. Secure transformer with four screws to bottom plate right. 1. Insert tube into filament lead (longer one) of power 5. Re-connect wire leads (primary and high voltage) to transformer. power transformer and filament leads of transformer to 2.

  • Page 22: Turntable Motor Removal

    4. Where the corners have been snipped off bend corner areas flat. No sharp edge must be evident after removal NOTE: The one (1) screw to fit the turntable motor cover of the turntable motor cover.

  • Page 23: Power Supply Cord Replacement

    R-3S68 OVEN LAMP AND LAMP SOCKET REMOVAL Oven lamp socket 1. CARRY OUT 3D CHECKS. 2. Pull the wire leads from the oven lamp socket by pushing Terminal the terminal hole of the oven lamp socket with the small Wire lead flat type screw driver.

  • Page 24: Door Replacement

    R-3S68 latch hook should be adjusted so that the 1st. latch 4. Re-install outer case and check for microwave leakage switch 2nd. interlock relay control switch are activated around door with an approved microwave survey meter. with the door closed. The horizontal position of the latch (Refer to Microwave Measurement Procedure.)
  • Page 25 R-3S68 SEALER FILM Note: After any service to the door; (A) Make sure that door sensing switch and secondary Installation interlock switch are operating properly. (Refer to 1. Put the adhesive tape on the backing film of the sealer chapter "Test Procedures".).

  • Page 26: Microwave Measurement

    R-3S68 MICROWAVE MEASUREMENT Recommended instruments are: After adjustment of door latch switches, monitor switch NARDA 8100 and door are completed individually or collectively, the NARDA 8200 following leakage test must be performed with a survey instrument and it must be confirmed that the result meets...

  • Page 27: Wiring Diagram

    R-3S68 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 2. CLOCK APPEARS ON DISPLAY COM. N.O. 2ND. INTERLOCK RELAY CONTROL SWITCH 1ST. LATCH THERMAL CUT-OUT SWITCH 95˚C (FAN) Figure O-1. Oven Schematic-OFF Condition...

  • Page 28: Pictorial Diagram

    R-3S68...

  • Page 29: Control Panel Circuit

    R-3S68 – –...

  • Page 30: Printed Wiring Board

    R-3S68 (J3) E Q22 (J1) CN - A LEAD WIRE VRS1 LEAD WIRE CN - B POWER OL TTM FM GREEN Figure S-3. Printed Wiring Board...

  • Page 31: Parts List

    R-3S68 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 ELECTRICAL PARTS 1- 1 QSW-MA110WRE0 1st. latch and 2nd. Iinterlock relay control switches...
  • Page 32 R-3S68 ∆ 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 RTRNPA088DRE0 Transformer VRS1 RH-VZA032DRE0 Varistor (10G471K) VHEHZ4A2///-1 Zener diode (HZ4A2)
  • Page 33 R-3S68 HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA311WRK0 DOOR PROTECTION SHEET...
  • Page 34 R-3S68 OVEN AND CABINET PARTS 1-13 1-12 4-13 4-12 4-11 6-10 6-15 4-19 6-14 1-17 4-10 4-14 4-18 1-14 4-15 6-11 1-10 1-16 4-17 1-11 1-15 4-16...
  • Page 35 R-3S68 3- 1 CONTROL PANEL PARTS 3- 2 3- 5 3-2-1 DOOR PARTS 3- 3 3- 4 MISCELLANEOUS Actual wire harness may be different from illustration. 6-12...
  • Page 36 R-3S68 '96SHARP CORP. (3U0.07E) Printed in Japan...

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