R-820JS SERVICE MANUAL S5405R820JPS/ DOUBLE GRILL CONVECTION MICROWAVE OVEN MODEL R-820JS 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. GRILL 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.
R-820JS 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-820JS 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 When the testing is completed, 1.
R-820JS 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-820JS SERVICE MANUAL PRODUCT DESCRIPTION DOUBLE GRILL CONVECTION MICROWAVE OVEN GENERAL INFORMATION R-820JS FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-820JS. 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-820JS SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 12.5 Amperes (Microwave) / 13.0 Amperes (Grill/ Convection) 60 Hertz / Single phase, 3 wire grounded Power Output 900 watts (IEC Test Procedure) Operating frequency of 2450MHz Top Heater Power Output 1000 Watts Top & Bottom Heater Power Output 1500 Watts Case Dimensions Width 20-1/2" Cooking Cavity Dimensions (0.
R-820JS A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord. Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized. If the extension cord must be used, it should be a 3-wire, 15 amp. or higher rated cord.
R-820JS OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence. (1) When the door opens from the closed position, the relay (RY5), primary interlock relay(RY2) and secondary interlock switch open their contacts. And contacts of the relay(RY6) remains closed.
R-820JS 2. The numbers of the digital read-out start the count down to zero. 3. Then the top heaters, bottom heater, turntable motor, oven lamp and fan motor are energized. 4. Now, the food is grilled by the top heaters and the bottom heater. 5. Upon completion of the selected cooking time, audible signal sounds and the contacts of relays(RY3, RY4 and RY6) are opened, then the top heating elements, bottom heating element, turntable motor and oven lamp are deenergized.
R-820JS NOTE: The microwave power can not be changed. To change the temperature, touch the ROAST pad twice. When the display says "SELECT TEMP", touch desired temperature pad. When the START pad is pressed, the following operations occur: 1. The numbers on the digital read-out start to count down. 2. The shut-off relays(RY1, RY5 and RY6) are energized, turning on the oven lamp, turntable motor, cooling fan motor and convection motor. 3.
THERMAL CUT-OUT (MAG.) 9 RY3 RY4 COM. COM. SECONDARY INTERLOCK SWITCH Figure O-2 Oven Schematic-Microwave cooking Condition H.V. RECTIFIER CAPACITOR 0.94µF AC2200V N.O. N.O. N.O. MAGNETRON POWER TRANSFORMER MONITOR SWITCH GRILL HEATER (TOP) BOTTOM HEATER CONTROL UNIT COM. RY2: RPIMARY INTERLOCK RELAY RY6 THERMAL CUT-OUT (OVEN) TURNTABLE MOTOR A3 RY5 COM. COM. COM. N.O. A3 A5 RY4 RY3 H.V. RECTIFIER CAPACITOR 0.94µF AC2200V N.O. MAGNETRON POWER TRANSFORMER MONITOR SWITCH N.O.
R-820JS MAGNETRON H.V. RECTIFIER CAPACITOR 0.94µF AC2200V MONITOR SWITCH GRILL HEATER (TOP) BOTTOM HEATER POWER TRANSFORMER N.O. N.O. RY4 COM. COM. TURNTABLE MOTOR TTM OL OVEN LAMP N.O. COM. A3 RY6 RY5 A5 FAN MOTOR FM RY1 CM CONVECTION MOTOR THERMISTOR D3 D1 B2 DOOR SENSING SWITCH B1 EARTH THERMAL CUT-OUT (MAG.) RY3 CONTROL UNIT N.O. COM. RY2: RPIMARY INTERLOCK RELAY Indicates components with potential above 250 V.
R-820JS MAGNETRON H.V. RECTIFIER CAPACITOR 0.94µF AC2200V MONITOR SWITCH GRILL HEATER (TOP) BOTTOM HEATER COM. COM. TURNTABLE MOTOR COM. TTM OL N.O. OVEN LAMP FM FAN MOTOR POWER TRANSFORMER N.O. N.O. RY4 RY3 RY6 A3 A5 RY5 RY1 CM CONVECTION MOTOR THERMISTOR D3 D1 B2 DOOR SENSING SWITCH B1 EARTH THERMAL CUT-OUT (MAG.) N.O. COM.
R-820JS DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM of the monitor switch contacts. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), RELAY (RY6), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY. The door is opened by pushing the open button on the control panel, refer to Figure D-1.
R-820JS BOTTOM HEATER Most of this hot air is reheated by the top heaters and the bottom heater and passes through the convection passage and enters the inside of the oven cavity again, in a continuing cycle. In this way, the hot air circulates inside the oven cavity to raise its temperature and, at the same time, comes into contact with the food being cooked. When the temperature inside the oven cavity reaches the selected temperature, the top heaters and the bottom heater are de-energized.
R-820JS CK = Check / RE = Replace POSSIBLE CASE AND DEFECTIVE PARTS CONDITION PROBLEM A B C D E E F F G H I Monitor fuse blows when power cord is plugged into wall outlet. Monitor fuse blows when the door is opened. Oven lamp does not light when door is opened. (Display operates.) OFF CONDITION Home fuse blows when power cord is plugged into wall outlet. "SHARP SIMPLY ..... PRESS CLOCK" does not appear in display when power cord is plugged into wall outlet.
R-820JS 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-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C 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.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT. F SECONDARY INTERLOCK SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8. Disconnect the power supply cord, and then remove outer case.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit. Reconnect all leads removed from components RED during testing.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 10.Reconnect the power supply cord after the outer case is installed. 11.Run the oven and check all functions. J K THERMISTOR 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. Disconnect connector-D from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s D1 and D3.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6) Re-install the outer case (cabinet). 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all. b) When touching a number pad, two figures or more are displayed. c) When touching the pads, sometimes a pad produces no signal. If the key unit is defective.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST G7 G6 G5 G4 G3 G2 G1 G9 5 4 3 2 1 GRILL BAKE (AUTO) CUSTOM HELP G10 0 9 8 7 6 PIZZA (AUTO) COOK (AUTO) STOP CLEAR START TOUCH ON POWER LEVEL ROAST REHEAT ROAST (AUTO) GRILL (AUTO) CONVEC CLOCK MINUTE PLUS DEFROST (AUTO) KITCHEN TIMER POPCORN G12 G8 G11 If the control unit responds by clearing with a beep the key unit is faulty and must be replaced.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (2) Close the door, touch the "Auto Defrost" pad once and touch the Number pad "1", and touch the Number pad 5. And then touch the "START" pad. (3) The oven is in Auto Defrost cooking condition. (4) The oven will operate as follows WEIGHT (Ground meat) 0.5lb 1ST STAGE LEVEL TIME 70% 50sec. 2ND STAGE LEVEL TIME 0% 1min. 3RD STAGE LEVEL TIME 50% 35sec. 4TH STAGE LEVEL TIME 30% 45sec.
R-820JS TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 9) 10) 11) 12) 13) 14) Open the door and block it open. Discharge high voltage capacitor. Reconnect all leads removed from components during testing. Re-install the outer case (cabinet). Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.
R-820JS DESCRIPTION OF LSI LSI The I/O signal of the LSI are detailed in the following table. Pin No. 1 Signal C1 I/O IN VL1 IN Power source voltage input terminal. Standard voltage for LCD. AN7-AN4 IN Heating constant compensation terminal. 7 AN3 IN Temperature measurement input: OVEN THERMISTOR. By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.
R-820JS Pin No. Signal I/O 26 P40 OUT Bottom heater driving signal. To turn on and off the bottom relay (RY4). "L" level during grill (TOP AND BOTTOM) cooking, Convection cooking or Roast cooking, "H" level otherwise. The heater relay turns on and off within a 48 second time base in accordance with the special program in LSI. 27 P77 OUT Convection motor driving signal. To turn on and off shut-off relay(RY1). "L" level during CONVECTION; "H" level otherwise.
R-820JS Pin No. Signal I/O 35 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. 36 XCIN IN Terminal not used. 37 XOUT IN Terminal not used. 38 XIN IN Internal clock oscillation frequency input setting.
R-820JS Pin No. Signal I/O SEG39-SEG0 OUT 91 VCC IN Connected to GND. 92 VREF IN Connected to GND. 93 AVSS IN Connected to VC. 94 COM3 OUT Common data signal: COM4. Connected to LCD (Pin No. 36). 95 COM2 OUT Common data signal: COM3. Connected to LCD (Pin No. 35). 96 COM1 OUT Common data signal: COM2. Connected to LCD (Pin No. 34). 97 COM0 OUT Common data signal: COM1. Connected to LCD (Pin No. 33). VL3-VL2 IN Power source voltage input terminal. Standard voltage for LCD.
R-820JS SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the 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-820JS PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Control unit 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-820JS 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-820JS 9. Discharge the H.V. capacitor before carrying out any further work. 10.Do not operate the oven with the outer case removed. CAUTION: 1. DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.
R-820JS frame to the oven cavity front plate. 7. Lift up the control panel assembly. 8. Now, the control panel assembly is free. CONTROL UNIT 9. Disconnect the flat ribbon cable from the connector CN-G. 10.Remove the four (4) screws holding the control unit to the control panel frame. 11.Release the two (2) tabs of the control panel frame holding the CPU unit of the control unit to the control panel frame. 12.
R-820JS INSTALLATION 1. Install the fan motor to the fan duct with the two (2) screws. 2. Install the fan blade to the fan motor shaft according to the following procedure. 3. Hold the center of the bracket which supports the shaft of the fan motor on the flat table. 4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet. CAUTION: * Do not hit the fan blade hard when installing because the bracket may be disfigured.
R-820JS oven cavity rear plate. 7. Remove the air duct with the air guide cover and the partition plate from the oven cavity rear plate. 8. Remove the one (1) screw holding the thermistor angle to the oven cavity rear plate. 9. Remove the thermistor angle together with thermistor from the oven. 10.Straighten the tab of the thermistor angle holding the thermistor to the thermistor angle. 11.
R-820JS misadjustment, the following adjustment should be made. 4. Loosen the two (2) screws holding latch hook to the oven cavity front flange. 5. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed.
R-820JS 5. Hold the door panel to the door frame with four (4) screws. 6. Catch two (2) pins of door panel on two (2) hole of upper and lower oven hinges. 7. Re-install choke cover to door panel by pushing. Note: After any service to the door; (A) Make sure that door sensing switch and secondary interlock switch are operating properly. (Refer to chapter "Test Procedures".).
H 1 2 3 37 4 ORG RED 1 PRIMARY RY2 INTERLOCK RELAY RY4 CN-A RY5 RY1 5 BRN ORG 1 GRY 2 3 ORG 4 5 RED CN-A ORG BLK BRN COM COM. TURNTABLE MOTOR WHT BLK WHT WHT BOTTOM HEATER NOTE: Hot (RED) wire must be connected to the terminal with blue mark on the oven light socket. RED WHT RED BRN RED GRY WHT ORG RED WHT POWER TRANSFORMER H.V. WIRE B H.V. RECTIFIER H.V.WIRE A MAGNETRON H.V. CAPACITOR HIGH VOLTAGE COMPONENTS CONVECTION MOTOR THERMAL CUT-OUT 125°C(MAG.
R-820JS 2 1 4 3 6 5 CN-C A Q2 2SB1238 R4 CN-A B3P5-VH-B T1 D1 -- D4 A155DR 1N4002x4 D1 8 D3 4 D5 D6 R5 4.7K + _ + _ C B 10uF/35V D2 0.1uF/50V C4 D4 C3 6 470uF/50V 1 0.1uF/50V C2 C2 GND AC120V 60Hz R2 R3 510 1/2W 510 1/2W C3 VC SP1 (J1) B A1 VRS1 10G471K A C10 LED 27 C1 AC 9pin HARNESS x2 R6 3.3K C C5 BUZZER A3 D12 FAN MOTOR RY5 C1 VA C4 INT C15 FM OJ-SH-124 D A5 OL TTM NO OJ-SH-124 C16 CONV. C5 E AC COM 10uF/35V D11 RY6 + _ CONV.
CN-C OVEN TH NC NC DOOR SW MICRO B.HEATER T.HEATER OL.TTM CONVECTION MOTOR FAN BUZZER VA VR LED NOTE: C18 C17 C13 C11 C12 C7 C14 C8 C6 C16 C15 C5 C1 C9 C10 47uF/16V C11 150KF R80 R30 4.7K LD7 LD6 C21 0.1uF/50V Q24 DTA143EKA Q25 DTA143EKA Q40 DTA143EKA LD8 R82 9.1KF 15K R83 15K R31 R15 4.
R-820JS 1 2 4 3 5 6 A A B B C C D D E E F F G G H H Figure S-4.
R-820JS 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-820JS REF. NO. 4-25 4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 4-43 4-44 PART NO.
R-820JS HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION Order Parts from the authorized SHARP parts Distributor for your area. Defective parts requiring return should be returned as indicated in the Service Policy.
R-820JS 2 1 4 3 6 5 7-9 OVEN AND CABINET PARTS 2-2 7-19 7-9 A A 6-11 7-9 7-8 2-1 7-19 4-33 6-2 4-4 7-10 B B 4-25 7-9 7-12 4-29 7-5 4-36 7-10 4-23 4-44 4-3 1-11 4-26 4-41 1-12 7-10 C 7-17 4-27 7-4 7-10 1-16 7-10 4-39 1-9 4-19 4-42 1-14 4-18 7-10 1-15 1-8 4-35 4-40 4-43 7-13 6-12 4-1 D C 4-38 7-1 6-13 7-10 7-13 4-31 4-30 4-32 7-15 1-10 4-15 7-6 4-34 x3 A 7-8 D 4-37 7-16 7-6 7-18 7-14 7-8 7-10 7-6 6-5 6-7 7-6 4-24 7-7 7-9 1-13 E 1-17 7-1
R-820JS 2 1 4 3 6 5 DOOR PARTS A A 5-8 5-9 5-1 B B 5-6 5-2 C C 5-7 CONTROL PANEL PARTS 5-3 5-4 D D 3-3 5-5 3-2 E E 3-3 3-2-3 3-2-4 F F 3-1 MISCELLANEOUS 6-7 G 6-1 G 3-2-1 6-8 3-2-2 H H 6-10 6-9 Actual wire harness may be different from illustration.
R-820JS COPYRIGHT © 2004 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, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. '04 SHARP CORP. (5S2.530E) Printed in U.S.