R-480J SERVICE MANUAL S8406R480JPJ/ MICROWAVE OVEN MODEL R-480J 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 ................................................................................................................................
R-480J
R-480J SERVICE MANUAL PRODUCT SPECIFICATIONS MICROWAVE OVEN APPEARANCE VIEW 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.
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 Width 550 mm Height 315 mm Depth 446 mm Turntable diameter 360mm Control Complement Touch Control System Clock ( 1:00 - 12:59) Timer (0 - 99 minutes 99 seconds) Microwave Power for Variable Cooking Repetition Rate; HIGH ...........
R-480J APPEARANCE VIEW 1. 2. 3. 4. 5. 6. Ventilation openings Oven lamp Door hinges Door safety latches See through door 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 6 14 2 10 9 3 12 15 1 8 4 5 7 11 4 13 16 TOUCH CONTROL PANEL Display SENSOR DEFROST COOK HELP Indicator SENSOR COOK PADS Press to select Sensor Cook menus.
R-480J OPERATION SEQUENCE OFF CONDITION because the relay (RY1) stays closed. Shown in the display is the remaining time. Closing the door activates all door interlock switches (1st. latch switch, 2nd. interlock relay control switch) 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 program, the 1st.
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. AH SENSOR MIC RO WA VE 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 proper procedure.
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 on the control panel. When the door open button is pushed, the latch lever is moved upward, operating the latch head. The latch head is moved upward, and released from latch hook. Now the door can be opened.
R-480J SERVICING WARNING TO SERVICE PERSONNEL REMEMBER TO CHECK 4R Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage fuse, High voltage harness. 1) Reconnect all leads removed from components during testing. 2) Replace the outer case (cabinet). 3) Reconnect the supply. 4) Run the oven.
R-480J CK = Check / RE = Replace CONDITION PROBLEM E E F G G H H Home fuse blows when power supply cord is plugged into wall outlet. FUSE F10A blows when power supply cord is plugged into wall outlet. OFF CONDITION 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 door opened. (Display appears.) Oven does not start when the START pad is touched.
R-480J TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST 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 ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm.
R-480J 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 - T1) ......................................... ∆T = 10°C Measured output power The equation is “P = 120 x ∆T” ...........................................
R-480J 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 10MΩ after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance. F.
R-480J TEST PROCEDURES PROCEDURE LETTER H COMPONENT TEST 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 Turntable motor Approximately 14.5 kΩ If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS. I BLOWN FUSE F10A CARRY OUT 3D CHECKS. 1.
R-480J 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 possible troubles caused by defective control unit. a) Buzzer does not sound or continues to sound. b) Clock does not operate properly.
R-480J TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Problem: POWER ON, indicator does not light up. CARRY OUT 3D CHECKS. STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Pin No. 1 of the 2-pin connector (A) and the normal open terminal of the relay RY1. Check supply voltage and oven power cord. 2 The rated AC voltage is present to primary side of low voltage transformer. Low voltage transformer or secondary circuit defective. Check and repair.
R-480J 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 capacitor. (4) Remove the AH sensor. (5) Install the new AH sensor. (6) Reconnect all leads removed from components during testing.
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 circuit. (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.
R-480J 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 3 COM4 COM3 OUT OUT Common data signal : COM12. Common data signal : COM13. Connected to LCD signal COM12. Connected to LCD signal COM13. 4 COM2 OUT Common data signal : COM14. Connected to LCD signal COM14. 5 COM1 OUT Common data signal : COM15. Connected to LCD signal COM15.
R-480J Pin No. Signal I/O Description 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 keys on key matrix is touched. 39 P03 OUT Key strobe signal. Signal applied to touch-key section.
R-480J . Pin No. Signal I/O 63-66 AIN3-AIN0 IN 67 COM8 OUT Common data signal : COM8. Connected to LCD signal COM8. 68 COM9 OUT Common data signal : COM7. Connected to LCD signal COM7. 69 COM10 OUT Common data signal : COM6. Connected to LCD signal COM6. 70 COM11 OUT Common data signal : COM5. Connected to LCD signal COM5. 71 COM12 OUT Common data signal : COM4. Connected to LCD signal COM4. 72 COM13 OUT Common data signal : COM3. Connected to LCD signal COM3.
R-480J ABSOLUTE HUMIDITY SENSOR CIRCUIT (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration. One thermistor is housed in the closed vessel filled with dry air while another in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow.
R-480J 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. and sometimes it is not fully protected by the built-in protection circuit.
R-480J COMPONENT REPLACEMENT 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.
R-480J MAGNETRON REMOVAL 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 magnetron with care so that magnetron antenna is not hit by any metal object around antenna. 6. Now, the magnetron is free. Re-install 1.
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 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 cavity. 6. Remove the oven lamp socket from the magnetron air duct by bending the small tab of magnetron air duct. 7.
R-480J 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. Shaft Coil Groove joint pliers Gap Bracket Table Shaft Axis Stator Stator Rotor Rear View Center of bracket These are the positions that should be pinched with pliers. Rotor Side View POWER SUPPLY CORD REPLACEMENT 4. CARRY OUT 4R CHECKS. Removal 1.
R-480J 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 close when door is opened. 4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter.
R-480J 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 oven hinges as shown Figure C-7. 9. Re-install the door stopper to the door assembly. Note: After any service to the door; (A) Make sure that 2nd.
R-480J MICROWAVE 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 microwave oven. 2. 3. REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from external surface of the oven.
R-480J SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. NOTE: " " indicates components with potentials above 250V. 2ND. INTERLOCK RELAY CONTROL SWITCH H. V. FUSE 0.8A N CAPACITOR 1.13µ AC2300V H.V. RECTIFIER OVEN LAMP F1 A1 B1 B2 A2 MAGNETRON POWER TRANSFORMER OL CONTROL UNIT F2 TTM AH SENSOR TURNTABLE MOTOR RY-2 2ND. INTERLOCK RELAY RY-1 MONITOR SWITCH N.O. FM COM. FAN MOTOR LINE BYPASS CAPACITOR 0.0022µ/AC250V COM. F3 LINE BYPASS CAPACITOR 0.
1 2 ORG 3 30 N.O. 1 2 RY2 COM. CN-A N.O. COM. CN-B 2 1ST. LATCH SWITCH 2 1 GRY CN-A 2 GRN 1 RED CN-B 4 5 BLU WHT WHT GRY MONITOR SWITCH E BLK TURNTABLE MOTOR GRY NOTE: Neutral (WHT) wire must be connected to the terminal with black mark on the oven light socket. OVEN LAMP AND SOCKET ORG Figure S-1. Pictorial Diagram BLACK MARK WHT BLU RED BLK GRY W H T POWER TRANSFORMER H.V. FUSE EARTH H.V.
R-480J 2 1 3 4 5 6 A A B B CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 C10 D6 1SS270A 1SS270A + – C2 GND C3 VC C1 VA C4 INT C9 VR C5 BUZZER C6 OVEN LAMP TURNTABLE MOTOR FAN MOTOR C7 MICRO C8 NC C11 NC C12 2ND. INTERLOCK RELAY CONTROL SWITCH R3 510 1/2w Q1 2SB1238 D (J1) D C C4 10µ/35v – C3 0.1µ/50v b + LED R5 4.7k ZD1 HZ16-1 d a D5 C1 0.1µ/50v A2 10G471K A1 VRS1 AC D1-D4 1N4002 T1 R1 2.
C-8 NC F-1 LD15 CN-F LD14 C11 LD13 LD12 0.1uF/50V : IF NOT SPECIFIED 1/10W ±5% F-3 F-2 47uF/16V LD10 LD11 DTA123JKA P45 P07 P44 CNTR0 DTA143EAK Q21 Q30 0. 1uF 50V Q20 DTA143EAK C20 P06 5 3.32KD R91 P05 EXPRESS COOK G3 1.
R-480J 2 1 3 4 5 6 A A B B (CN - C) 1 12 2 1 2 C5 5 6 4 E R1 B Q3 SP1 1 D7 VRB C 2 7 8 9 U SH - A R2 ZD1 D5 D6 SH - B B Q2 E Q1 B R5 R4 3 R3 D8 R6 D CN - C 1 WH - 1 C4 C 1 9 E C3 CN - B D D C2 RY2 T1 AC D3 E F S D4 D2 D1 1 VH 2 CN - A XA F VRS1 D9 F AC RY1 (CN - D) OMIF D U QKITPB026MRE0 E P 11 C1 10 (D10) OL FM TTM RY3 G G H H Figure S-4.
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.
R-480J Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. ∆ 5- 3 ∆ 5- 4 5- 5 ∆ 5- 6 5- 7 5- 8 PART NO.
R-480J 2 1 3 4 5 6 7-8 OVEN AND CABINET PARTS 7-8 A A 7-8 2-1 7-8 B B 7-1 7-4 4-11 1-5 4-14 C C 1-17 7-5 1-6 6-5 1-10 4-20 4-22 4-5 D 7-7 7-1 1-2 7-4 D 7-5 1-1 A 6-4 7-1 1-15 7-6 E E 4-6 7-5 4-8 4-15 4-9 7-1 7-2 4-7 1-9 4-13 6-7 1-13 4-4 1-11 1-3 7-5 7-1 7-3 4-1 F 4-19 F 1-12 1-4 7-1 1-14 1-3 A 4-16 4-17 2-2 4-2 4-12 1-8 G 4-21 G 1-16 6-3 7-1 2-3 1-7 4-3 7-8 H 7-8 7-1 7-8 7-8 2-3 7-8 1 2 H 4-10 3 2-3 7-9 4 36 5 6
R-480J 2 1 3 4 5 6 CONTROL PANEL PARTS A A 3-5 3-5 3-5 B B 3-3 3-2 3-4 3-1 C C DOOR PARTS 3-2-1 4-18 5-4 D 3-2-3 D 5-8 5 5-5 3-2-2 5-1 5-3 E E 5-8 5-2 F F 5-6 5-7 MISCELLANEOUS 6-2 G G 6-1 Actual wire harness may be different from illustration.
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. '04SHARP CORP. (08S0.
