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Sharp R-24AT - page 1
R-22AT R-24AT TABLE OF CONTENTS Page SERVICING ................................................................................................................. INSID E FRONT COVER CAUTION, MICROWAVE RADIATION ................................................................................................... ......... 1 WARNING .................... ...
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Sharp R-24AT - page 2
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. Wait for 60 seconds and then short-circuit th ...
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Sharp R-24AT - page 3
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. 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 satisfacto ...
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Sharp R-24AT - page 4
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 : NEUTRAL BROWN : LIVE PR ODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power ...
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Sharp R-24AT - page 5
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. Door safety latches 13. Door handle. 14. Outer cabinet 15. Remova ...
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Sharp R-24AT - page 6
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. 4. When the cooking time is up, a s ...
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Sharp R-24AT - page 7
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. The primary windings of the high voltage trans ...
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Sharp R-24AT - page 8
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. 5. The lower latch head is lifted up by the joint lever. 6. Now both latch heads are lifted up, s ...
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Sharp R-24AT - page 9
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. If the thermistor is open ...
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Sharp R-24AT - page 10
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. Oven lamp, fan motor and antenna motors do n ...
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Sharp R-24AT - page 11
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. 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 r ...
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Sharp R-24AT - page 12
R-22AT R-24AT 10 Room temperature ................................................................................................. T0 = 21 ° C Initial temperature .................................................................................................. T1 = 11 ° C Temperature after (28 + 3) = 31 sec [for R-22AT] ........................ ...
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Sharp R-24AT - page 13
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. NEVER make any voltage measurements of the high-voltage ...
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Sharp R-24AT - page 14
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 temperature temperature Condition Check point Magnetron tem- perature fuse (Up- per) TF1 Magnetron tem- perature fuse (Lower) TF2 Exhaust tempera- tu ...
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Sharp R-24AT - page 15
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. Resistance of Blower motor should be appro ...
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Sharp R-24AT - page 16
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. a) Buzzer does not sound or continues to sound. b) Cooki ...
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Sharp R-24AT - page 17
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. side of touch control ...
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Sharp R-24AT - page 18
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. When the oven is shipped, Memory pad 1 to 10 are set as follows: fig.1. Memory No. Cook ...
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Sharp R-24AT - page 19
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. Vp voltage of power source ci ...
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Sharp R-24AT - page 20
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). To turn on and off the shut-off relay (RY1). The S ...
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Sharp R-24AT - page 21
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 .................... 1st. P10 ................... 2nd. P07 .................... 3rd. P06 .................... 4th. ...
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Sharp R-24AT - page 22
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. Details of input/output signal for IC2 are as shown in the following diagram. Figure T-2. Relation ...
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Sharp R-24AT - page 23
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. (2) Servicing the touch control panel with ...
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Sharp R-24AT - page 24
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.) 1 NUMBER 1 • 1 MANUAL/ NUMBER 1 • 0 REPEAT 1 5 NUMBER 1 • 5 1 SET "NUMBER" • SET • Ente ...
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Sharp R-24AT - page 25
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. Example: Indicates lead-free solder of tin, sil ...
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Sharp R-24AT - page 26
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. (Hold the door in a closed position with one hand, then grip the door handle and the door lever assembly with the other, this causes the latch leads to rise, it is then possible to hear a “cli ...
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Sharp R-24AT - page 27
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). Removal 1. CARRY OUT 3D CHECKS. 2. Remove the rear cabinet, too. 3. Remove the magnetron from t ...
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Sharp R-24AT - page 28
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. IF IT IS DEFECTIVE, REPLACE THE HIGH VOLTAGE RECTIFIER ASSEMBLY. 3. WHEN REPLACING THE HIGH VOLTAGE RECTI- FIER ASSEMBLY AND THE HIGH VOLTAGE CA- PACITOR, THE CATHODE (EARTH) SI ...
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Sharp R-24AT - page 29
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. 3. Remove the air intake filter assembly from the base plate. 4. Remo ...
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Sharp R-24AT - page 30
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. 5. For stop switch removal 5-1. Disco ...
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Sharp R-24AT - page 31
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. (Refer to Microwave Measurement Procedure.) Note: The door on a m icrowave oven is designed to ac ...
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Sharp R-24AT - page 32
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. UPPER AND LOWER LATCH HEADS REMOVAL 7. Remove the door release lever from the door ...
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Sharp R-24AT - page 33
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. PREPARATION The following items are r ...
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Sharp R-24AT - page 34
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. FOR 1M ...
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Sharp R-24AT - page 35
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 SWITCH CN-A CN-A F3 : WEAK POINT A017 BLU NEUTRAL LIVE GRN/YLW BRN NOISE FILTER SW1: INTERLOCK SWITCH SW3: MONITOR SWITCH SW4: MONITOR SWITCH NOISE S ...
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Sharp R-24AT - page 36
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. NO COM. NC BRN BLU HIGH VOLTAGE COMPONENTS MG1 : MAGNETRON (Upper) White case Black ta ...
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Sharp R-24AT - page 37
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 P70 XIN XOUT VSS 32 31 30 29 28 27 26 25 24 23 22 21 P30 P31 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 M1 COM 3 4 1 2 6 5 ...
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Sharp R-24AT - page 38
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 ...
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Sharp R-24AT - page 39
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. REF. NO. PART NO. DESCRIPTION Q'TY CODE * * * ∆ * * * ELECTORIC PARTS 1- 1 FACCBA013WRKZ Power supply cord 1 AR 1- 2 QSOCLA024WRE0 Oven lamp socket 1 AH 1- 3 FW-QZA117WR ...
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Sharp R-24AT - page 40
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 (KRA101M) 1 AB Q3 VHIKIA79L05-3 Transistor (KIA79L05P) 1 AE Q11 VS2SB953-PQ-4 Transistor (2SB953) 1 AG Q20 VSKRA101M//-3 Transistor (KRA101M) 1 AB Q40 VS ...
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Sharp R-24AT - page 41
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 4-28 PDUC-A564WRW0 Mg exhaust duct 1 AP 4-29 PCUSUA414WRP0 Cushion 1 AD 4-30 LANGKA679WRPZ Fixing angle S 1 AD 4-31 HDECQA147WRM0 Corner cap right 1 A ...
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Sharp R-24AT - page 42
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. REF. NO. 3. PART NO. 4. DESCRIPTION PACKING AND ACCESSORIES REF. NO. PART NO. DESCRIPTION Q'TY CODE 7-18 XWSS740-10000 Washer: 4mm x 1mm 1 AA 7-19 XFTS740P12000 Screw : 4mm x 12mm 1 7-20 ...
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Sharp R-24AT - page 43
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 2-4-1 2-2 4-12 1-22 2-5 6-6 1-13 4-3 4-24 4-37 4-11 4-21 4-36 4-35 2-1 4-14 1-17 4-31 4-19 4-8 4-9 1-15 1-15 4-9 4-5 4-6 1-14 1-14 1-16 4-7 4-10 4-4 7-6 4 ...
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Sharp R-24AT - page 44
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. 6-4 6-3 5 3-6 3-4 3-5 3-3 3-2-3 3-2 3-2-2 3-1 3-2-4 3-2-5 3-2-1 5-15 5-16 5-17 5-18 5-4 5-13 5-13 5-10 5-14 5-1 5-9 5-8 5-7 5-6 5-13 5-13 5-2 5-20 5-1 ...
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