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Sharp R-480J manual

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Table of contents for the manual

  • Page 1

    R-480J TABLE OF CONTENTS Page CAUTION, MICROWAVE RADIATION ................................................................................................... .......... 1 WARNING .......................................................................................................................................................... 1 PRODUCT SPECI[...]

  • Page 2

    R-480J[...]

  • Page 3

    R-480J 1 SER VICE MANU AL MICROWAVE OVEN R-480J GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service. CAUTI[...]

  • Page 4

    R-480J 2 PR ODUCT SPECIFICA TIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.65 kW Power Output 1200 watts nominal of RF microwave energy (IEC Test Procedure) Operating frequency 2450 MHz Case Dimensions Width 550 mm Height 315 mm Depth 446 mm Turntable diameter 360mm Control Comple[...]

  • Page 5

    R-480J 3 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. Waveguide cover 12. Power supply cord 13. Rating label 14. Menu label 15. Turntable 16. Roller stay 10 3 4 2 7 13 5 [...]

  • Page 6

    R-480J 4 OPERA TION SEQUENCE because the relay (RY1) stays closed. Shown in the display is the remaining time. 6. MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by oven door, and monitors the operation of the 1st. latch switch and 2nd. interlock relay. 6-1 When the oven door is opened during or after the cycle of a cooking pro[...]

  • Page 7

    R-480J 5 2. Heat potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks. 3. Sensor detects moisture and humidity and calculates cooking time and variable power. Cooking Sequence. 1. Touch each SENSOR COOK or SENSOR INSTANT REHEAT function pad to operating the sensor cooking. Refer to the operation manual for the pro[...]

  • Page 8

    R-480J 6 Figure D-1. Door Open Mechanism 1ST. LATCH SWITCH AND 2ND. INTERLOCK RE- LAY CONTROL SWITCH 1. When the oven door is closed, the contacts (COM-NO) must be closed. 2. When the oven door is opened, the contacts (COM- NO) must be opened. MONITOR SWITCH 1. When the oven door is closed, the contacts (COM-NC) must be opened. 2. When the oven doo[...]

  • Page 9

    R-480J 7 SER VICING Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power trans- former, Magnetron, High voltage rectifier assem- bly, High voltage fuse, High voltage harness. REMEMBER TO CHECK 3D 1) Discon[...]

  • Page 10

    R-480J 8 CK = Check / RE = Replace Home fuse blows when power supply cord is plugged into wall outlet. FUSE F10A blows when power supply cord is plugged into wall outlet. Display does not show anything when power supply cord is plugged into wall outlet. Display does not operate properly when STOP/CLEAR pad is touched. Oven lamp does not light at do[...]

  • Page 11

    R-480J 9 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST A 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. To test for an open circuit filament use an ohmmet[...]

  • Page 12

    R-480J 10 D HIGH VOLTAGE CAPACITOR TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Room temperature .................. To = 21˚C Initial temperature ................. T1 = 11 ° C Temperature after (35 + 3) = 38 sec. ................................................................ T2 = 21 ° C Temperature difference Cold-Warm ( ∆ T = T2 - T[...]

  • Page 13

    R-480J 11 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range. C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10M Ω after it has been charged. D. A short-circuited capacitor shows continuity all[...]

  • Page 14

    R-480J 12 K TOUCH CONTROL PANEL ASSEMBLY TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST H MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below. Table: Resistance of Motor Motors Resistance Fan motor Approximately 250 Ω T[...]

  • Page 15

    R-480J 13 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST b) At a certain digit, brightness is low. c) Only one indicator does not light. d) The corresponding segments of all digits do not light up; or they continue to light up. e) Wrong figure appears. f) A certain group of indicators do not light up. g) The figure of all digits flicker. 2-3 Other[...]

  • Page 16

    R-480J 14 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Checking the initial sensor cooking condition WARNING : The oven should be fully assembled before following procedure. (1) The oven should be plugged in at least two minutes before sensor cooking. (2) Room temperature should not exceed 35˚C. (3) The unit should not be installed in any area [...]

  • Page 17

    R-480J 15 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. (1) Disconnect the power supply cord, and then remove outer case. (2) Open the door and block it open. (3) Discharge high voltage capa[...]

  • Page 18

    R-480J 16 T OUCH CONTROL P ANEL ASSEMBL Y OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. (1) Key Unit (2) Control Unit (The Control Unit consists of Power Unit and LSI Unit). The principal functions of these units and the signals communicated among them are explained below. Key Unit The key unit is compose[...]

  • Page 19

    R-480J 17 LSI The I/O signal of the LSI is detailed in the following table. Pin No. Signal I/O Description 1 COM5 OUT Common data signal : COM11. Connected to LCD signal COM11. 2 COM4 OUT Common data signal : COM12. Connected to LCD signal COM12. 3 COM3 OUT Common data signal : COM13. Connected to LCD signal COM13. 4 COM2 OUT Common data signal : C[...]

  • Page 20

    R-480J 18 37 P05 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16 and P17 terminal while one of G3 line keys on key matrix is touched. 38 P04 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AIN7, P14, P15, P16, P17 and AIN6 terminal while one of G4 line[...]

  • Page 21

    R-480J 19 Pin No. Signal I/O Description 63-66 AIN3-AIN0 IN Terminal to change cooking input according to the Model. By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its cooking constant. 67 COM8 OUT Common data signal : COM8. Connected to LCD signal COM8. .6 8 COM9 OUT Commo[...]

  • Page 22

    R-480J 20 SW1 SW2 SW3 SW4 SW5 P20 P21 P22 P23 P24 LSI (IC1) AIN4 AIN5 620k 300k 150k 75k 37.4k 26 23 22 50 49 24 25 15k 15k 4.7k 1234 8765 0.01uF 0.1uF 0.01uF VA : -15V VA : -15V R90 330 C90 C91 C93 C92 S F-2 1.8k IC2 F-1 F-3 C 3.57k 3.32k VC : -5V 0.1 uF C. Thermistor in closed vessel S. Thermistor in open vessel R98 R99 R96 R91 360k R93 R92 R94 R[...]

  • Page 23

    R-480J 21 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[...]

  • Page 24

    R-480J 22 COMPONENT REPLA CEMENT 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. 2. Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed posi[...]

  • Page 25

    R-480J 23 Removal 1. CARRY OUT 3D CHECKS. 2. Disconnect wire leads from magnetron. 3. Remove the two (2) screws holding the magnetron air duct to magnetron. And slide magnetron air duct slightly so that two (2) screws at left hand side of magnetron appear. 4. Carefully remove the four (4) screws holding magnetron to waveguide flange. 5. Remove magn[...]

  • Page 26

    R-480J 24 OVEN LAMP AND LAMP SOCKET REMOVAL 1. CARRY OUT 3D CHECKS. 2. Remove one (1) screw holding the chassis support to the magnetron and magnetron air duct. 3. Remove one (1) screw holding the chassis support to the oven cavity front plate. 4. Remove the chassis support from the oven cavity. 5. Release the magnetron air duct from the oven cavit[...]

  • Page 27

    R-480J 25 2. Install the fan motor to the back plate of the oven cavity with the two (2) screws. 3. Re-install the fan duct to the oven cavity. 4. Connect the wire leads to the fan motor and magnetron, referring to the pictorial diagram. Rear View Side View POWER SUPPLY CORD REPLACEMENT Removal 1. CARRY OUT 3D CHECKS. 2. Disconnect the brown and bl[...]

  • Page 28

    R-480J 26 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. The 1st. latch switch and 2nd. interlock relay control switch interrupt the circuit before the door can be opened. 3. Monitor switch contacts cl[...]

  • Page 29

    R-480J 27 door panel upward. 5. Hold the door panel to the door frame with three (3) screws. 6. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head to door frame. 7. Re-install choke cover to door panel by pushing. 8. Catch two (2) pins of door panel on two (2) hole of upper and lower [...]

  • Page 30

    R-480J 28 MICRO W A VE MEASUREMENT After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for micro- wave oven. REQUIREMENT The safety[...]

  • Page 31

    R-480J 29 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. Figure O-1. Oven Schematic-OFF Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME PROGRAMMED. 3. START KEY TOUCHED. Figure O-2. Oven Schematic-Cooking Condition POWER [...]

  • Page 32

    R-480J 30 Figure S-1. Pictorial Diagram 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 COM. MONITOR SWITCH COM. N.O. N.C. 2ND. INTERLOCK RELAY CONTROL SWITCH 1ST. LATCH SWITCH TURNTABLE MOTOR BLK GRY RED GRN GRN WHT BLK WHT WHT RED WHT WHT THERMAL CUT-OUT (OVEN) NOISE FILTER COM. N.O. WHT BLU GRY GRN ORG BLK ORG RED RED GRY 2 1 CN-A GRN RED 2 [...]

  • Page 33

    R-480J 31 Figure S-2. Power unitl Circuit 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 + – + – + – A 1 B 2 B 1 CN-A R4 27 D5 T1 ab c d VRS1 (J1) D7 D8 1SS270A 1SS270A 10G471K C1 0.1 µ /50v C3 0.1 µ /50v ZD1 HZ16-1 C5 10 µ /35v C2 1000 µ /35v C4 10 µ /35v R1 2.4k 1SS270A 1SS270A D1-D4 1N4002 D6 R5 4.7k R2 680 1/2w R3 510 1/2w R6 3.[...]

  • Page 34

    R-480J 32 Figure S3. CPU. Unit Circuit 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 SENSOR DEFROST TURNTABLE OFF COOK HELP C11 + - 0.1uF/50V (J17) (J16) (J15) (J14) (J13) (J12) (J11) (J10) C13 47uF/16V ZD10 UDZ4.3B R15 C14 0.01uF/50V R11 R19 4.7K 4.7K 1K C10 R41 15K R40 4.7K C40 0.01uF/50V R68 R69 R70 R71 R72 R73 R10 4.7K R12 15K CF1 4MHz R7[...]

  • Page 35

    R-480J 33 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 Figure S-4. Printed Wiring Board WH - 1 SH - B SH - A 1 C3 C4 C5 R3 C2 F C1 10 D4 D2 D1 D3 D9 (D10) RY3 (CN - D) D8 ZD1 VRB DU R2 R1 R6 R5 SP1 3 E B D6 D5 Q2 R4 2 6 11 P S RY2 T1 AC VRS1 QKITPB026MRE0 5 D7 OMIF DU 9 8 7 E Q1 B 4 E RY1 AC OL TTM FM B Q3 (CN - C) CN - C CN - B CN - A 1 1 9[...]

  • Page 36

    R-480J 34 ∆ ∆ 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 * * * * ∆ * * * ELECTRICAL PARTS 1- 1 RTHM-A120WRE0 Thermal cut-out 145 deg.C (Magnetron) 1 AH 1- 1 RTHM-A080WRE0 Thermal cut-ou[...]

  • Page 37

    R-480J 35 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 REF. NO. PART NO. DESCRIPTION Q'TY CODE ∆ ∆ ∆ 5- 3 GWAKPA813WRRZ Door frame 1 AX 5- 4 GCOVHA382WRF0 Choke cover 1 AM 5- 5 PSHEPA336WRP0 Sealer film 1 AF[...]

  • Page 38

    R-480J 36 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 OVEN AND CABINET PARTS 7-8 7-8 7-8 7-8 2-1 6-7 1-5 4-5 4-20 7-1 4-11 7-1 7-4 7-1 4-6 7-6 1-15 7-2 4-9 1-13 7-5 4-1 4-7 1-9 4-4 1-3 1-4 1-3 1-14 1-1 1-11 1-12 7-9 2-3 7-8 2-2 4-15 7-8 2-3 2-3 6-4 4-19 7-1 1-7 1-8 7-1 4-16 4-2 4-17 A A 4-3 1-16 7-5 4-12 4-21 4-10 6-5 1-6 7-7 7-5 1-10 1-2 7[...]

  • Page 39

    R-480J 37 1 A B C D E F G H A B C D E F G H 23 4 5 6 12 34 56 CONTROL PANEL PARTS DOOR PARTS Actual wire harness may be different from illustration. 6-2 4-18 5-4 5-8 5-8 5-5 5-6 5-1 5-7 5-3 5-2 5 3-1 3-5 3-5 3-5 3-2 3-3 3-4 3-2-1 3-2-3 3-2-2 6-1 MISCELLANEOUS[...]

  • Page 40

    R-480J '04SHARP CORP. (08S0.CD_E) 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.[...]