R-21JCA-F SERVICE MANUAL S0514R21JCPAF LIGHT DUTY COMMERCIAL MICROWAVE OVENS MODEL R-21JCA-F 1000W/ R-21JCA TIME GUIDE FOR ONE 15 - 30 sec. Bagel, Roll Muffin, Pastry Pie Slice 40 50 30 D E 20 C 10 SERVING 30 - 60 sec. Hot Dog Pizza Slice Small Sandwich 1 - 2 min. Beverage, Soup Large Sandwich Popcorn, 1.5 oz. 2 - 3 min. Casserole, Stew Chili, Chowder Popcorn, 3.5 oz. 1 F 1.
R-21JCA-F PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
R-21JCA-F 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 shock. (Example) High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage 1.
R-21JCA-F MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
R-21JCA-F SERVICE MANUAL PRODUCT DESCRIPTION LIGHT DUTY COMMERCIAL MICROWAVE OVEN GENERAL INFORMATION 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. OPERATION It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.
R-21JCA-F SPECIFICATION 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" (406mm) Cooking Cavity Dimensions (1.
R-21JCA-F 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 11 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 intake openings 16. Outer case cabinet 12 9 1 3 2 14 13 4 15 16 8 10 6 5 7 CONTROL PANEL TIME GUIDE FOR ONE SERVING 15 - 30 sec.
R-21JCA-F OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. 5. Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition. 6.
R-21JCA-F SCHEMATIC NOTE: CONDITION OF OVEN 1. LIGHT UP DIAL OFF. 2. DOOR CLOSED. NOTE: THERMAL CUT-OUT 125˚C (OVEN) THERMAL CUT-OUT 145˚C (MAG.) FUSE 20A L NOISE FILTER Indicates components with potential above 250 V. POWER TRANSFORMER MONITOR SWITCH CAPACITOR 0.94 µF 2400V RECTIFIER LINE BYPASS CAPACITOR 0.003300 F / AC 125V A3 A1 OL DOOR SENSING SWITCH OVEN LAMP FM FAN MOTOR MAGNETRON RY2 COOK RELAY RY1 PRIMARY INTERLOCK RELAY LINE BYPASS CAPACITOR 0.
R-21JCA-F 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. and secondary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.
R-21JCA-F TROUBLESHOOTING 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. These tests are given a procedure letter which will be found in the "Test Procedure "section.
R-21JCA-F TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
R-21JCA-F TEST PROCEDURES PROCEDURE LETTER C COMPONENT TEST HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
R-21JCA-F TEST PROCEDURES PROCEDURE LETTER F COMPONENT TEST SECONDARY INTERLOCK SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. 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 circuit with the door open and a closed circuit with the door closed.
R-21JCA-F TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST BLOWN MONITOR FUSE TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.
R-21JCA-F 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 up. d) All or some LEDs continue to light up. e) A certain group of LEDs do not light up. f) The LEDs flicker.
R-21JCA-F TEST PROCEDURES PROCEDURE LETTER L COMPONENT TEST FOIL PATTERN ON THE PRINTED WIRING BOARD 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) Discharge high voltage capacitor. 4) Follow the troubleshooting guide given below for repair.
R-21JCA-F TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL Control Unit Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, encoder circuit and indicator circuit. 4) Reset Circuit A circuit to generate a signals which resets the LSI to the initial state when power is supplied. 5) Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds (completion sound).
R-21JCA-F Pin No. Signal I/O Description 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 CNVSS terminal. 11 XOUT OUT 12 XIN IN Internal clock oscillation frequency input setting.
R-21JCA-F TOUCH CONTROL PANEL SERVICING 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 voltage power source, static electricity charge in clothes, etc.
R-21JCA-F 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: Sn-Ag-Cu Indicates lead-free solder of tin, silver and copper. 2. Using lead-free wire solder When repairing a PWB with the "LF" symbol, only lead-free solder should be used.
R-21JCA-F COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1.
R-21JCA-F 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 the power transformer. 5. Disconnect the filament lead of the power transformer from the high voltage capacitor. 6.
R-21JCA-F POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL Terminal 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. Push the lever of positive lock® connector. 5. Pull down on the positive lock® connector. Positive lock® connector 1 Push Lever CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® CONNECTOR SO THAT THE LEVER FACES YOU. 2 Pull down Figure C-2.
R-21JCA-F POWER SUPPLY CORD REPLACEMENT 7. Now, the power supply cord is free. 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 the oven cavity rear plate. Oven Cavity Rear Plate Re-install 1.
R-21JCA-F After adjustment, check the following. 1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm. 2.
R-21JCA-F (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards. (Refer to Microwave Measurement Procedure.) Pin Upper Oven Hinge Upper Oven Hinge 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 of latch hole. 2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm. 3.
R-21JCA-F To left wall of oven cavity Flat face Antenna motor shaft To right wall of oven cavity Flat face Antenna holder Stirrer antenna Centre Hole Stirrer antenna assembly Stirrer antenna's big blade Tab Antenna motor shaft Figure C-9. Derection of Antenna Motor Shaft and Stirrer Antenna Assembly Oven cavity bottom plate Antenna holder Antenna holder Stirrer antenna Stirrer antenna Tab Antenna motor shaft Antenna motor shaft Tab Oven cavity bottom plate Figure C-10.
2 RY2 5 BLU 4 3 YLW 2 1 PNK ORG CN-A RED BLU ORG G RY1 ORG RED F 3 27 4 ORG N.C. WHT WHT COM MONMITOR SWITCH BLU WHT WHT WHT COM. YLW PNK N.O. E 5 Figure S-1. Pictorial Diagram RED WHT RED WHT WHT FAN MOTOR ORG ORG BLU BRN WHT BLK FUSE POWER TRANSFORMER MAGNETRON RED WHT THERMAL CUT-OUT 145°C(MAG.) H.V.
AC A5 VRS1 10G471K R11 2W 100 R12 1/2W 100K D1 1 1N4005E x 4 C1 D3 2.2µ/160VAC 3 28 4 B C C2 A 0.1µ/50 V C3 R63 4.7K R62 4.7K 3 Model Chg. 9 220µ/16V 5 (2M) D71 27K (.) R10 4.7K 6 R5 1K C6 Q72 KRA101S 5 Q70 KRA101S 4 CF1 4MHz Q71 KRA101S INT0 N.F VDD VSS XIN XOUT CNVSS RESET C60 16 15 14 13 12 11 10 9 14 Q1 C30 4.7K R21 C20 0.
R-21JCA-F 1 2 4 3 5 6 A A B B LD8 D80 D76 JP39 JP36 D72 D71 LD9 JP34 JP35 LD2 JP37 LD7 LD4 LD3 JP38 LD6 LD5 D79 LD10 D75 SW1 JP33 LD1 LD11 C LD13 C D83 JP28 D84 JP27 D85 LD14 JP26 JP25 D82 LD15 JP24 LD20 LD16 LD17 LD18 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LD19 D JP23 D LD12 D78 B D74 A JP29 JP30 D81 D77 D73 D70 JP31 JP32 C E 1 32 8 9 24 JP10 2 JP12 JP11 JP14 CNC JP21 1 ZD6 JP16 JP17 JP15 16 17 JP13 JP18 E JP22 JP20 JP19 C
R-21JCA-F 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.
R-21JCA-F REF. NO. 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 PART NO.
R-21JCA-F 2 1 4 3 7-3 OVEN AND CABINET PARTS 7-3 2-1 A 6 5 A 7-3 1-10 1-9 4-28 7-13 7-3 6-6 4-9 B B 4-10 7-13 6-8 4-25 7-6 7-12 4-32 1-4 6-5 1-13 4-26 4-34 7-13 7-1 4-26 6-3 C 4-24 6-4 4-27 C 1-4 1-1 4-15 4-14 7-1 7-7 4-19 1-8 4-15 4-36 4-16 4-2 7-9 7-10 4-40 7-11 D 4-21 4-22 4-18 4-24 4-20 4-21 D 1-12 4-23 7-8 7-7 4-21 4-20 1-7 E E 4-33 6-10 7-2 4-13 7-4 7-1 7-4 4-29 1-11 7-1 4-31 1-15 7-7 4-6 7-1 1-6 4-3 4-8 4-30 1-3 F 4-12 F
R-21JCA-F 2 1 4 3 6 5 3-1 CONTROL PANEL PARTS 3-5 A A 3-2 3-5 3-2-1 B C B 3-2-2 3-3 C DOOR PARTS 3-4 5-2 5-1-15 5-1-16 5-1-14 5-1 D 5-1-2 5-1-12 D 5-1-16 5-1-18 5-1-4-2 5-1-16 5-1-13 5-1-4-5 x4 5-1-4-4 5-1-4 E 5-1-4-3 E 5-1-1 5-1-4-1 5-1-4-5 x2 5-1-16 5-1-12 5-1-8 5-1-7 F F 5-1-17 5-1-9 5-1-11 5-3 5-1-3 5-1-8 5-1-17 5-1-5 5-1-6 G G MISCELLANEOUS 6-2 6-9 5-1-10 Actual wire harness may be different from illustration.
R-21JCA-F PACKING AND ACCESSORIES TOP PAD ASSEMBLY (FPADBA385WRK0) WRAP COVER (SSAKHA034WRE0) TRAY HOLDER DOOR PROTECTION SHEET (SPADFA435WRE0) (SPADPA204WRE0) 6-7 MENU STICKER 6-1 INSTRUCTION BOOK the avity Into en C Ov BOTTOM PAD ASSEMBLY (FPADBA386WRK0) PACKING CASE Not Replaceable Items. SPAKCD803WREZ COPYRIGHT © 2005 BY SHARP CORPORATION ALL RIGHTS RESERVED.