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Sharp R-480J Service Manual

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See also: Operating Manual
CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 6
SERVICING ...................................................................................................................................................... 7
TEST PROCEDURE ......................................................................................................................................... 9
TOUCH CONTROL PANEL ............................................................................................................................. 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 22
MICROWAVE MEASUREMENT .................................................................................................................... 28
WIRING DIAGRAM ......................................................................................................................................... 29
PICTORIAL DIAGRAM ................................................................................................................................... 30
POWER UNIT CIRCUIT .................................................................................................................................. 31
CPU UNIT CIRCUIT ........................................................................................................................................ 32
PRINTED WIRING BOARD ............................................................................................................................. 33
PARTS LIST ................................................................................................................................................... 34
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
S8406R480JPJ/
MICROWAVE OVEN
R-480J
R-480J
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  • Page 1: Table Of Contents

    R-480J SERVICE MANUAL S8406R480JPJ/ MICROWAVE OVEN R-480J 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-480J...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-480J GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service OPERATING SEQUENCE 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 FUNCTION OF IMPORTANT satisfactory customer service.

  • Page 4: Product Specifications

    R-480J PRODUCT SPECIFICATIONS 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...

  • Page 5: Appearance View

    R-480J 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...

  • Page 6: Operation Sequence

    2nd. interlock relay control switch must open their Figure O-1 on page 29 contacts first. After that the contacts (COM-NC) of the 1. The display shows SHARP, MICRO-WAVE and OVEN. monitor switch can be closed. 2. To set any programs or set the clock, you must first 6-2.
  • Page 7 R-480J 1. Potatoes at room temperature. Vapor is emitted very slowly. 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.

  • Page 8: Function Of Important Components

    R-480J FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM THERMAL CUT-OUT 145˚C (OVEN) The door can be opened by pushing the door open button The thermal cut-out located on the top of the oven cavity on the control panel. When the door open button is...

  • Page 9: Servicing

    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 10 R-480J CK = Check / RE = Replace TEST PROCEDURE A B C D E E F G G H H I J K L M N RE RE CK CK CK CK CK CK CK CK O POSSIBLE CAUSE...

  • Page 11: Test Procedure

    R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 12 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 - T1) ......... ∆T = 10°C Measured output power The equation is “P = 120 x ∆T”...
  • Page 13 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 10MΩ after it has been charged.
  • Page 14 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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...
  • Page 15 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.
  • Page 16 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Problem: POWER ON, indicator does not light up. CARRY OUT 3D CHECKS. STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between Check supply voltage and oven power cord. Pin No. 1 of the 2-pin connector (A) and the normal open terminal of the relay RY1.
  • Page 17 R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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.

  • Page 18: Touch Control Panel

    R-480J TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock (1) Key Unit circuit.
  • Page 19 R-480J The I/O signal of the LSI is detailed in the following table. Pin No. Signal Description COM5 Common data signal : COM11. Connected to LCD signal COM11. COM4 Common data signal : COM12. Connected to LCD signal COM12. COM3 Common data signal : COM13.
  • Page 20 R-480J Pin No. Signal Description 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. Key strobe signal.
  • Page 21 R-480J Pin No. Signal Description 63-66 AIN3-AIN0 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.
  • Page 22 R-480J ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor Then the LSI observes that voltage at AIN5 terminal The absolute humidity sensor includes two thermistors and compares it with its initial value, and when the as shown in the illustration. One thermistor is housed...
  • Page 23 R-480J TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components For those models, check and repair all the controls This unit uses CMOS LSI in the integral part of the (sensor-related ones included) of the touch control circuits. When handling these parts, the following panel while keeping it connected to the oven.

  • Page 24: Component Replacement And Adjustment Procedure

    Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures: WARNING FOR WIRING and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 25 4. Where the portions have been snipped off bend portions plate left near by the turntable motor cover. This screw flat. No sharp edge must be evident after removal of the will be used at the following step 3. turntable motor cover.
  • Page 26 R-480J OVEN LAMP AND LAMP SOCKET REMOVAL 9. Now, the oven lamp and lamp socket are free. 1. CARRY OUT 3D CHECKS. 2. Remove one (1) screw holding the chassis support to Oven lamp the magnetron and magnetron air duct.
  • Page 27 R-480J 2. Install the fan motor to the back plate of the oven cavity 4. Connect the wire leads to the fan motor and magnetron, with the two (2) screws. referring to the pictorial diagram. 3. Re-install the fan duct to the oven cavity.
  • Page 28 R-480J toward the oven face. Then check lower portion of the Door latch hook, pushing and pulling lower portion of the Latch Hook door toward the oven face. Both results (play in the door) should be less than 0.5mm. Latch 2.
  • Page 29 R-480J door panel upward. 5. Hold the door panel to the door frame with three (3) Upper oven hinge screws. 6. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head Door to door frame.

  • Page 30: Microwave Measurement

    R-480J 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 HOLADAY HI 1500 instrument and it must be confirmed that the result meets...

  • Page 31: Wiring Diagram

    R-480J SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. THERMAL CUT-OUT 145˚C (MAGNETRON) FUSE F10A N.O. N.O. COM. COM. RY-2 RY-1 2ND. INTERLOCK RELAY H. V. FUSE 0.8A...

  • Page 32: Pictorial Diagram

    R-480J...

  • Page 33: Power Unit Circuit

    R-480J CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k CN-A D1-D4 1N4002 1SS270A 1SS270A – – R3 510 1/2w Q1 2SB1238 R2 680 1/2w SP1 PKM22EPT Q3 KRC243M BUZZER OVEN LAMP R6 3.3k TURNTABLE OVEN LAMP MOTOR...

  • Page 34: Cpu Unit Circuit

    R-480J COM8 COM7 COM6 COM5 COM4 COM3 COM2 COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG33 COM13 SEG8 SEG32 COM12 SEG9 SEG31 COM11 SEG10 SEG30 COM10 SEG29 COM9 SEG11 SEG12 SEG28 COM8 AIN0 SEG13 SEG27 SEG14 SEG26 AIN1 SEG15...

  • Page 35: Printed Wiring Board

    R-480J (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-4. Printed Wiring Board...

  • Page 36: Parts List

    R-480J 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 RTHM-A120WRE0 Thermal cut-out 145 deg.C (Magnetron)
  • Page 37 R-480J ∆ 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 ∆ 5- 3 GWAKPA813WRRZ Door frame ∆ 5- 4...
  • Page 38 R-480J OVEN AND CABINET PARTS 4-11 4-14 1-10 1-17 4-20 4-22 1-15 4-15 4-19 4-13 1-13 1-11 1-12 1-14 4-16 4-17 4-12 4-21 1-16 4-10...
  • Page 39 R-480J CONTROL PANEL PARTS DOOR PARTS 3-2-1 4-18 3-2-3 3-2-2 MISCELLANEOUS Actual wire harness may be different from illustration.
  • Page 40 R-480J 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.

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R-490f

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