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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 ........................................................................................................................
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R-480J
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R-480J SERVICE MANUAL PRODUCT SPECIFICATIONS MICROWAVE OVEN R-480J APPEARANCE VIEW 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. COMPONENTS CAUTION MICROWAVE RADIATION SERVICING AND DO NOT BECOME EXPOSED TO R
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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 ..........
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R-480J APPEARANCE VIEW 1. Ventilation openings 2. Oven lamp 6 14 3. Door hinges 2 4. Door safety latches 10 12 5. See through door 6. Door seals and sealing surfaces 15 9 3 1 7. Coupling 8. Door open button 8 9. Touch control panel 10.Digital readout 5 16 7 11 4 13 4 11.Waveguide cover 12.Power supply cord 13.Rating label 14.Menu label 15.Turntable 16.Roller stay TOUCH CONTROL PANEL Display SENSOR DEFROST COOK HELP Indicator SENSOR COOK PADS EXPRESS MENUS PADS Press to select Sensor Cook menu
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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 IMPORTANT The monitor switch is mechanically controlled by oven When the oven door is closed, the monitor switch contacts door, and monitors the operation of the 1st. latch switch (COM-NC) must be open. and 2nd. interlock relay. When the mi
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MICROWAVE 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 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. NOTE: The oven should not be operated on SENSOR COOK
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R-480J FUNCTION OF IMPORTANT COMPONENTS THERMAL CUT-OUT 145˚C (OVEN) DOOR OPEN MECHANISM The thermal cut-out located on the top of the oven cavity The door can be opened by pushing the door open button is designed to prevent damage to the oven if the foods in on the control panel. When the door open button is the oven catch fire due to over heating produced by pushed, the latch lever is moved upward, operating the improper setting of cook time or failure of control unit. latch head. The latch he
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R-480J SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- REMEMBER TO CHECK 4R ducing very high voltage and current, contact with any part of the high voltage circuit will result in 1) Reconnect all leads removed from components electrocution. High voltage capacitor, Power trans- during testing. former, Magnetron, High voltage rectifier assem- 2) Replace the outer case (cabinet). bly, High voltage fuse, High voltage harness. 3) Reconnect the supply. 4) Run
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R-480J CK = Check / RE = Replace TEST PROCEDURE AB C D EEE F G G H H I J K L M N RE RE CK CK CK CK CK CK CK CK O POSSIBLE CAUSE AND DEFECTIVE PARTS PROBLEM CONDITION 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 OFF anything when power supply CONDITION cord is plugged into wall outlet. Display does not operate properly when STOP/CLEAR pad is touched. Oven lamp does not light
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R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm. To test for short circuit fil
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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” ........................................... P = 120 x 10°C = 1200 Watts JUDGEMENT:
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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. 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. When the internal wire is opened in th
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R-480J TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 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. If the fuse F10A is blown, there co
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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. 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. c) Cooking is no
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OMIF DU T1 12 AC XA VH VRS1 QKITPB026MRE0 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 1 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. 2 The rated AC voltage is present to primary Low voltage transformer or secondary circuit defective. side of low voltage tran
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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. (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. (7) Re-install the outer
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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. (2) Control Unit (The Control Unit consists of Power Symbol Voltage Application Unit and LSI Unit). VC -5V LSI(IC1) The principal functions of these units and the signals communicated among them are explained below. 4) Relay Circuit A circuit to
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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 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 : COM14. Connected to LCD signal COM14. 5 COM1 OUT Common data signal : COM15. Connected to LCD signal COM15. 6 COM0 OUT Common data signal : COM16. Connect
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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. A pulse signal is input
