Instruction/ maintenance manual of the product R-22AT Sharp
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R-22AT R-24AT TABLE OF CONTENTS Page SERVICING ................................................................................................................. INSID E FRONT COVER CAUTION, MICROWAVE RADIATION .........................................
R-22AT R-24AT REMEMBER TO CHECK 3D 1) D isconnect the supply. 2) D oor opened, and wedged open. 3) D ischarge high two voltage capacitors. WARNING: AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORS. The two high-voltage capacitors remain charged about 60 seconds after the oven has been switched off.
R-22AT R-24AT 1 SER VICE MANU AL COMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp.
R-22AT R-24AT 2 GENERAL INFORMA TION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE: GREEN-AND-YELLOW : EARTH BLUE : N.
R-22AT R-24AT 3 APPEARANCE VIEW OVEN 1. Control panel 2. Hole for safety door latches 3. Ceramic floor 4. Splash cover 5. Oven light 6. Air intake filter 7. Air intake openings 8. Oven cavity 9. Door seals and sealing surfaces 10. Door hinges 11. Oven door with see-through window 12.
R-22AT R-24AT 4 OPERA TION SEQUENCE to negative voltage of approximately 4000 volts D.C.. 3. The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channelled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.
R-22AT R-24AT 5 NOTE: The ON/OFF time ratio does not exactly corre- spond to the percentage of microwave power, because approx. 3 seconds are needed for heat- ing up the magnetron filament. TWO MAGNETRON OPERATION SYSTEM Two magnetrons MG1+MG2 are equipped in order to get higher microwave power output.
R-22AT R-24AT 6 DOOR OPEN MECHANISM 1. The door release lever is pulled. 2. The upper latch head is lifted up by the linked door release lever. 3. The head lever is lifted up by the door release lever. 4. The joint lever is lifted up by the head lever.
R-22AT R-24AT 7 EXHAUST OVEN THERMISTOR TH3 The thermistor is a negative temperature coefficient type. The temperature in the exhaust duct is detected through the resistance of the thermistor. If the temperature is high, the control panel will display “EE7” and the oven will stop to avoid overheating and catching fire.
R-22AT R-24AT 8 “ . “ does not appear on display when power cord is plugged into wall outlet. Control panel can not accept key in. Fuse F1 or F2 blows when the door is opened. Home fuse blows when power cord is plugged into wall outlet. Weak point F3 blows when power cord is plugged into wall outlet.
R-22AT R-24AT 9 A MAGNETRON TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST CARRY OUT 3D CHECKS. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
R-22AT R-24AT 10 Room temperature ................................................................................................. T0 = 21 ° C Initial temperature ......................................................................................
R-22AT R-24AT 11 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST B HIGH VOLTAGE TRANSFORMER TEST WARNING: High voltage and large currents are present at the secondary winding and filament winding of the high voltage transformer. It is very dangerous to work near this part when the oven is on.
R-22AT R-24AT 12 3. CARRY OUT 4R CHECKS. CAUTION: IF THE temperature fuse INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE temperature fuse. I THERMISTOR TH1, TH2, TH3 TEST Open Close Display or.
R-22AT R-24AT 13 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST If the meter does not indicate above resistance, replace the thermistor. 3. CARRY OUT 4R CHECKS. J MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals.
R-22AT R-24AT 14 P PROCEDURES TO BE TAKEN WHEN THE FUSE ON THE PRINTED WIRING BOARD(PWB) IS OPEN TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST f) A certain group of indicators do not light up. g) The figure of all digits flicker. 2-3 Other possible problems caused by defective control unit.
R-22AT R-24AT 15 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at Check supply voltage and oven power cord. POWER terminal of CPU connector (CN-A). 2 The rated AC voltage is present at primary Touch control transformer or secondary circuit defective.
R-22AT R-24AT 16 2. Key Unit The key unit is composed of a matrix circuit in which when a key it touched, one of signals P33 - P34 generated by the LSI, is passed through the key and returned to the LSI as one of signals P24 - P27. This model has 20 Memory pads.
R-22AT R-24AT 17 Pin No. Signal I/O Description DESCRIPTION OF LSI LSI(IXA222DR) The I/O signal of the LSI(IXA222DR) is detailed in the following table. 1 VCC IN Power source voltage: GND. VC voltage of power source circuit input. Connected to GND. 2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -35V.
R-22AT R-24AT 18 19 P47 OUT Signal to sound buzzer. This signal is to control the 2.5kHz continuous signal. A: Switch touch sound. B: Guidance sound. C: Completion sound. 20-21 P46-P45 - Terminal not used. 22 P44 OUT Oven lamp, Blower motor and Antenna motor driving signal (Square Waveform : 50Hz).
R-22AT R-24AT 19 Pin No. Signal I/O Description 41-46 P17-P12 OUT Segment data signal. Signal similar to P23.. 47-48 P11-P10 OUT Digit selection signal. The relation between digit signal and digit are as follows: Digit signal Digit P11 ...............
R-22AT R-24AT 20 2-2 Memory IC (I-2) CAT24WC16PI is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512 registers x 8bits, enabling individual access, read and write operations to be performed.
R-22AT R-24AT 21 touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.
R-22AT R-24AT 22 2) How to enter the memory information Example : Suppose cooking time 5 sec. and output power 100% are entered into the memory pad 1. PAD ORDER DISPLAY PHONE (Door close) • SET • SET "NUMBER" • (within 2 sec.
R-22AT R-24AT 23 PRECA UTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The "Main 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.
R-22AT R-24AT 24 1. Disconnect the oven from power supply. 2. Make sure that a definite “click” can be heard when the microwave oven door is unlatched.
R-22AT R-24AT 25 5. Pull out the wire lead(s) of high voltage transformer(s) from the tube. 6. Disconnect wire lead(s) of high voltage transformer(s) from high voltage capacitor(s). 7. Disconnect the high voltage fuse(s) from high voltage transformer(s).
R-22AT R-24AT 26 CAUTION: 1. DISCHARGE THE TWO HIGH VOLTAGE CAPACI- TORS BEFORE TOUCHING ANY OVEN COMPO- NENTS OR WIRING. 2. DO NOT REPLACE ONLY THE HIGH VOLTAGE RECTIFIER.
R-22AT R-24AT 27 CONTROL PANEL ASSEMBLY REMOVAL The complete control panel should be removed for re- placement of components. To remove the control panel, proceed as follows: 1. Disconnect the oven from power supply. 2. Wait for 60 seconds to discharge the high voltage capacitor.
R-22AT R-24AT 28 Figure C-4. Power supply cord replacement 1. CARRY OUT 3D CHECKS. 2. Remove the control panel from the oven cavity refer- ring to “CONTROL PANEL REMOVAL”. 3. Remove the two (2) screws holding the latch hook to the oven cavity. 4. Open the door and pull the latch hook out of the oven cavity.
R-22AT R-24AT 29 cavity face plate is to be less than 1.0mm. 3. The door is positioned with its face depressed toward the cavity face plate. 4. Re-install outer case and check for microwave leakage around door with an approved microwave survey me- ter.
R-22AT R-24AT 30 SER VICE INFORMA TION IMP ORTANT: When the magnetron MG1 and/or MG2 is replacing, the relays (RY3 and RY4) on control unit must be replaced at the same time. Because if the magnetron's life has been over, the relay's life may also be over.
R-22AT R-24AT 31 MICRO W A VE MEASUREMENT After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335-2-25 specifies that the maximum permitted leakage with a load of 275 ml is 50 W/m 2 (equivalent to 5 mW/cm 2 ) at a distance of 5 cm from the oven.
R-22AT R-24AT 32 SCHEMATIC NOTE: CONDITION OF OVEN 1. POWER SUPPLY CONNECTED AND/OR 1MINUTE AFTER DOOR CLOSED OR COOK OFF. 2. . APPEAR ON DISPLAY. NOTE: Indicates components with potential above 250 V. Figure O-1 Oven Schematic-OFF Condition Figure O-2 Oven Schematic-IDLE Condition (Door opened condition) SCHEMATIC NOTE: CONDITION OF OVEN 1.
R-22AT R-24AT 33 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. MANUAL REPEAT KEY TOUCHED. 3. COOKING TIME PROGREMMED. 4. START PAD TOUCHED. Figure O-3 Oven Schematic-Cooking Condition SW5: STOP.
R-22AT R-24AT 34 Figure S-1. Pictrorial Diagram 1 A B C D E F G H A B C D E F G H 23 45 6 12 34 56 BRN NOISE FILTER BLU NL SW5 : STOP SWITCH TOUCH CONTROL PANEL CN-C 3 6 GRN 2 4 5 1 ORG NO COM. BLU GRN GRN ORG WHT COM. NO SW1: INTERLOCK SWITCH (Cabinet side) COM.
R-22AT R-24AT 35 1 A B C D E F G H A B C D E F G H 23 45 6 12 34 56 Figure S-2. Control Panel Circuit 47 44 46 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 P45 P44 P43 P42 INT1 INT0 RESET P71 P7.
R-22AT R-24AT 36 1 A B C D E F G H A B C D E F G H 23 45 6 12 34 56 Figure S-3. Printed Wiring Board BLACK RED 2.5A FUSE.
R-22AT R-24AT 37 PA R TS LIST Note: The parts marked " ∆ " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V.
R-22AT R-24AT 38 ∆ ∆ ∆ REF. NO. PART NO. DESCRIPTION Q'TY CODE F1 QFS-IA001KKZZ Fuse 2.5A 50V 1 AD I- 1 RH-IXA222DRZZ LSI 1 AU I- 2 RH-IXA298DRZZ EEPROM 1 AK Q2 VSKRA101M//-3 Transistor (KR.
R-22AT R-24AT 39 REF. NO. PART NO. DESCRIPTION Q'TY CODE 4-24 MHNG-A215WRM0 Upper oven hinge 1 AG 4-25 PCUSUA413WRP0 Cushion 1 AG 4-26 PCUSUA415WRP0 Cushion 1 AC 4-27 PDUC-A729WRF0 Air duct 1 AL .
R-22AT R-24AT 40 HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and correctly, please furnish the following information. 1. MODEL NUMBER 2.
R-22AT R-24AT 41 OVEN AND CABINET PARTS 1 A B C D E F G H A B C D E F G H 23 45 6 12 34 56 7-2 7-2 7-6 7-6 7-6 4-20 2-3 7-21 7-6 7-3 7-6 7-4 4-39 7-19 7-18 7-6 7-6 7-6 7-5 A 1 B A 2 2-4 6-7 2-4-2 2-4-.
R-22AT R-24AT 42 '05SHARP CORP. (1S0.0e_E) CONTROL PANEL PARTS MISCELLANEOUS DOOR PARTS 1 A B C D E F G H A B C D E F G H 23 45 6 12 34 56 Actual wire harness may be different from illustration.
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