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Sharp R-21JCA-F manual

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Table of contents for the manual

  • Page 1

    R-21JCA-F In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical[...]

  • Page 2

    R-21JCA-F PRECA UTIONS T O BE OBSER VED BEFORE AND DURING SER VICING T O A V OID POSSIBLE EXPOSURE T O EXCESSIVE MICR O W A VE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as [...]

  • Page 3

    R-21JCA-F 1 W ARNING T O SER VICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harn[...]

  • Page 4

    R-21JCA-F 2 MICR O W A VE MEASUREMENT PR OCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm 2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the [...]

  • Page 5

    R-21JCA-F 3 SHARP ELECTRONICS CORPORATION SHARP PLAZA, MAHWAH, NEW JERSEY 07430-2135 SER VICE MANU AL LIGHT DUTY COMMERCIAL MICROWAVE OVEN R-21JCA-F FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-21JCA-F. It is recommended that servi[...]

  • Page 6

    R-21JCA-F 4 3-Pronged Plug Grounded Receptacle Box Grounding Pin 3-Pronged Receptacle ITEM DESCRIPTION Power Requirements 120 Volts 14 Amperes 60 Hertz / Single phase, 3 wire grounded Power Output 1000 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Case Dimensions Width 20-1/2" (520mm) Height 12-1/8" (309mm) Depth 16" [...]

  • Page 7

    R-21JCA-F 5 OVEN DIAGRAM 1. Back splash cover 2. Side splash cover 3. Oven light 4. Ceramic shelf 5. Control panel 6. Cavity face plate 7. Door latch openings 8. Door latches 9. Door hinges 10. Door seals and sealing surfaces 11. Door handle 12. Oven door with see-through window 13.Air ventilation cover and openings 14. Power supply cord 15. Air in[...]

  • Page 8

    R-21JCA-F 6 OPERA TION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. OFF CONDITION Closing the door activates door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When oven is plugged in, 120 volts A.C. is supplied to the noi[...]

  • Page 9

    R-21JCA-F 7 Figure O-2 Oven Schematic-Microwave cooking Condition NOTE: Indicates components with potential above 250 V. Figure O-1 Oven Schematic-OFF Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. LIGHT UP DIAL OFF. 2. DOOR CLOSED. SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. LIGHT UP DIAL ON. FUSE LINE CROSS CAPACITOR 0.22 F AC250V NOISE [...]

  • Page 10

    R-21JCA-F 8 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by grasping the door handle, refer to Figure D-1. When the door handle is grasped, the handle lever is pulled. And then the upper and lower latch heads are moved upward by the handle lever, and they are released from the latch hook. Now the door will open. Fig[...]

  • Page 11

    R-21JCA-F 9 TR OUBLESHOO TING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed.[...]

  • Page 12

    R-21JCA-F 10 A MAGNETRON ASSEMBLY TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron[...]

  • Page 13

    R-21JCA-F 11 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the [...]

  • Page 14

    R-21JCA-F 12 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open ci[...]

  • Page 15

    R-21JCA-F 13 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST J CONTROL PANEL ASSEMBLY TEST WARNING : To prevent an electric shock do not touch the electrical parts and the printed wiring board. Because the control unit is "TRANSLESS CIRCUIT" and many electrical parts are used at A.C. line voltage. The control panel consists of circuits in[...]

  • Page 16

    R-21JCA-F 14 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6) After that procedure, re-connect the power supply cord. 1. Control Panel The following symptoms indicate a defective control unit. 1-1 In connection with LEDs a) At a certain LED, all or some LEDs do not light up. b) At a certain LED, brightness is low. c) Only one LED does not light u[...]

  • Page 17

    R-21JCA-F 15 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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. 1. Foil pattern check and repairs. 1) Disconnect the power supply cord and then remove outer case. 2) Open the door and block it open. 3) [...]

  • Page 18

    R-21JCA-F 16 DESCRIPTION OF LSI LSI The I/O signal of the LSI is detailed in the following table. T OUCH CONTROL P ANEL ASSEMBL Y OUTLINE OF TOUCH CONTROL PANEL Control Unit Control unit consists of LSI, power source circuit, synchroniz- ing signal circuit, reset circuit, buzzer circuit, encoder circuit and indicator circuit. 1) LSI This LSI contro[...]

  • Page 19

    R-21JCA-F 17 9 RESET IN Auto clear terminal. Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level. 10 CNVSS IN Power source voltage. The power source voltage to drive the LSI is input to CN[...]

  • Page 20

    R-21JCA-F 18 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surrounding high volt[...]

  • Page 21

    R-21JCA-F 19 PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder. Example: Indicates lead-free solder of tin, silver a[...]

  • Page 22

    R-21JCA-F 20 POWER TRANSFORMER REMOVAL To remove the outer case, proceed as follows. 1. Disconnect the power supply cord. 2. Open the oven door and block it open. 3. Remove the five (5) screws from rear and along the side edge of case. 4. Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate. 5. Lift the enti[...]

  • Page 23

    R-21JCA-F 21 HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL To remove the components, proceed as follows. 1. Disconnect the power supply cord and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect H.V. wire of the high voltage rectifier assembly from the magnetron and t[...]

  • Page 24

    R-21JCA-F 22 Side View Rear View Shaft Table Center of bracket Gap Rotor Bracket Stator Groove joint pliers Coil Shaft Axis Stator Rotor These are the positions that should be pinched with pliers COOLING FAN MOTOR REMOVAL POSITIVE LOCK ® CONNECTOR (NO-CASE TYPE) REMOVAL Figure C-2. Positive lock ® connector 1. Disconnect the power supply cord and[...]

  • Page 25

    R-21JCA-F 23 Removal 1. Disconnect the power supply cord and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Remove the one (1) screw holding the green wire to the cavity rear plate. 5. Disconnect the wire leads of the power supply cord from the noisew filter. 6. Release the power supply cord from[...]

  • Page 26

    R-21JCA-F 24 CHOKE COVER 1. Disconnect the power supply cord. 2. Open the door slightly. 3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame as shown in Figure C-6 to free engaging parts. 4. Pry the choke cover by inserting a putty knife as shown in Figure C-6. 5. Release choke cover from door pane[...]

  • Page 27

    R-21JCA-F 25 (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards. (Refer to Microwave Measurement Procedure.) After any service, make sure of the following : 1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center o[...]

  • Page 28

    R-21JCA-F 26 1. Disconnect the power supply cord. 2. Open the door and block it open. 3. Make sure that the smooth surface of the ceramic shelf face up. 4. Make sure that the rubber packing without a fin of the ceramic shelf faces the front of the oven. NOTE: The three (3) rubber packings with the fins and the one (1) rubber packing without a fin a[...]

  • Page 29

    R-21JCA-F 27 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-1. Pictorial Diagram FUSE RED BLK L N WHT RED WHT WHT ORG GRY THERMAL CUT-OUT 125˚C(OVEN) OVEN LAMP & SOCKET THERMAL CUT-OUT 145°C(MAG.) FAN MOTOR WHT ORG WHT RED WHT HIGH VOLTAGE COMPONENTS MAGNETRON H.V. CAPACITOR H.V. RECTIFIER POWER TRANSFORMER GRN POWER SUPPLY CO[...]

  • Page 30

    R-21JCA-F 28 Figure S-2. Control Panel Circuit 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H INT0 N.F VDD VSS XIN XOUT CNVSS RESET D3 D4 D5 D6 D7 P20 P21 P22 A B C D4 ICP 1 C2 C3 Q1 R1 R2 Q2 R5 1K POWER TRANSFORMER D70 D71 D72 D73 DOOR SENSING SWITCH 0.1µ/50 V 1000µ/35 V 0.1µ/50 V C3 1 C7 R7 R8 R9 P03 P10 P11 P12 P13 D0 D1 D2 16 15 14 13[...]

  • Page 31

    R-21JCA-F 29 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-3. Printed Wiring Board JP38 JP39 JP30 JP36 D71 D76 D78 D74 D70 D80 D72 D81 D77 D73 JP34 JP31 JP23 JP22 JP21 JP5 R11 RY2 RY1 ICP1 JP4 JP6 JP10 JP11 JP12 12 JP2 C21 JP3 CNC Q1 EB JP14 JP20 JP18 JP9 JP19 JP7 ZD1 ZD5 ZD4 ZD2 ZD3 D10 D11 D20 D21 JP17 JP13 JP8 JP1 R3 SP1 CF1 JP1[...]

  • Page 32

    R-21JCA-F 30 ∆ ∆ * * * ∆ * PA R TS 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 FFS-BA015WRK0 Monitor fuse(20A) and monitor switch(V-5220D-070) assembly 1A K 1- 2 QSW-MA051WRE0 Door sensi[...]

  • Page 33

    R-21JCA-F 31 ∆ ∆ ∆ ∆ ∆ ∆ ∆ REF. NO. PART NO. DESCRIPTION Q'TY CODE 4-34 PSPA-A112WRE0 Mica washer 1 AC 4-35 PCUSGA378WRP0 Cushion 1 AL 4-36 PCUSUA507WRP0 Cushion 1 AC 4-37 PCUSUA517WRP0 Cushion 1 AE 4-38 PSHEPA674WRE0 Cover 1 AL 4-39 PPACGA171WRE0 Cushion 1 AK 4-40 PSHEPA673WRE0 S/Film 1 AD 4-41 PCUSUA518WRP0 Cushion 1 AC DOOR PA[...]

  • Page 34

    R-21JCA-F 32 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H OVEN AND CABINET PARTS 7-3 7-3 7-12 1-13 6-4 1-1 7-7 4-15 4-15 1-8 7-7 4-33 7-4 7-1 7-1 7-4 1-11 1-15 4-3 4-4 4-5 1-3 1-5 7-5 4-35 4-39 7-11 7-11 2-5 4-7 1-1 4-6 4-6 7-7 4-30 4-24 4-24 2-4 4-10 6-8 2-1 4-14 4-20 7-1 4-8 2-3 7-8 7-11 4-11 1-14 1-2 4-29 4-20 4-22 4-34 7-3 4-25 7-3 7-1[...]

  • Page 35

    R-21JCA-F 33 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS 3-2-2 3-3 3-2-1 3-2 3-1 3-5 3-5 3-4 Actual wire harness may be different from illustration. 5-1-6 5-2 5-1-4-5 6-2 5-1-15 5-1-7 5-1-8 5-1-8 5-1-9 5-1-13 5-1-17 5-1-11 5-1-3 5-1-4-1 5-1-1 5-1-4-5 5-1-12 5-1-12 5-1-14 5-1-18 5-1-4 5-1-17 5-1[...]

  • Page 36

    R-21JCA-F 34 '05 SHARP CORP. (10S0.80E) Printed in U.S.A COPYRIGHT © 2005 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, me- chanical, photocopying, recording, or other- wise, without prior written permission of the p[...]