R-22AT R-24AT SERVICE MANUAL SY520R24ATK// COMMERCIAL MICROWAVE OVEN DOUBLE QUANTITY 1900W/R-24 EXPRESS DEFROST AT 1 12 2 13 3 14 4 15 5 16 6 17 7 18 8 19 9 20 0 MANUAL/ REHEAT STOP / CLEAR POWER LEVEL START SET R-24AT 11 CHECK MODELS VOLUME R-22AT R-24AT In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. This revised service manual is applied to R-22AT from serial No.
R-22AT R-24AT SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts will result in electrocution. High voltage capacitors, High voltage transformers, Magnetrons, High voltage rectifier assembly, High voltage fuses, High voltage harness. REMEMBER TO CHECK 3D 1) Disconnect the supply. 2) Door opened, and wedged open. 3) Discharge high two voltage capacitors.
R-22AT R-24AT SERVICE MANUAL PRODUCT SPECIFICATIONS COMMERCIAL MICROWAVE OVEN APPEARANCE VIEW 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 satisfactory customer service.
R-22AT R-24AT PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements Power Comsumption Power Output Case Dimensions Cooking Cavity Dimensions Control Complement for 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed 2.4 kW Approx. 11 A [R-22AT] / 2.9 kW Approx.
R-22AT R-24AT APPEARANCE VIEW OVEN 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18 19 Control panel Hole for safety door latches Ceramic floor Splash cover Oven light Air intake filter Air intake openings Oven cavity 13 Door seals and sealing surfaces Door hinges Oven door with see-through window Door safety latches Door handle.
R-22AT R-24AT OPERATION SEQUENCE Closing the door activates all door interlock switches (interlock switches and stop switch). 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.
R-22AT R-24AT 48 sec. ON Number key 44sec. ON Number key 9 40 sec. ON Number key 8 36 sec. ON Number key 7 32 sec. ON Number key 6 26 sec. ON Number key 5 22 sec. ON Number key 4 16 sec. ON Number key 3 12 sec. ON Number key 2 8 sec. ON Number key 1 0 sec. ON Number key 0 NOTE: The ON/OFF time ratio does not exactly correspond to the percentage of microwave power, because approx. 3 seconds are needed for heating up the magnetron filament.
R-22AT R-24AT FUNCTION OF IMPORTANT COMPONENTS 3. If the door is opened and the interlock switch SW1 (or SW2) contacts fail to open, the fuse F1 F10A (or F2 F10A) blows simultaneously with closing of the monitor switch SW3 (or SW4) contacts. CAUTION:BEFORE REPLACING A BLOWN FUSE F1 F10A (OR F2 F10A) TEST THE INTERLOCK SWITCH SW1 (OR SW2) AND MONITOR SWITCHE SW3 (OR SW4) FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”). DOOR OPEN MECHANISM 1. The door release lever is pulled. 2.
R-22AT R-24AT EXHAUST OVEN THERMISTOR TH3 BLOWER MOTOR BM 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, the control panel will display "EE6" and the oven will stop. The blower motor BM drives a blade which draws external cool air into the oven.
ON CONDITION C C B B A A OFF CONDITION J J I I I L L H H H F G G E E E E D D D “ . “ 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 not work for 1 minute when the door is opened or after cooking.
R-22AT R-24AT TEST PROCEDURES PROCEDURE LETTER A MAGNETRON TEST COMPONENT TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. 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 reading of less than 1 ohm.
R-22AT R-24AT TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Room temperature ................................................................................................. T0 = 21°C Initial temperature .................................................................................................. T1 = 11°C Temperature after (28 + 3) = 31 sec [for R-22AT].................................................. T2 = 21°C Temperature after (22 + 3) = 25 sec [for R-24AT].....................................
R-22AT R-24AT 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 circuits, including the magnetron filament. CARRY OUT 3D CHECKS. Disconnect the leads to the primary winding of the high voltage transformer.
R-22AT R-24AT TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Table: Terminal Connection of Switch Plunger Operation COM to NO COM to NC Released Depressed Open circuit Short circuit Short circuit Open circuit COM; Common terminal, NO; Normally open terminal NC; Normally close terminal If incorrect readings are obtained, make the necessary switch adjustment or replace the switch. CARRY OUT 4R CHECKS. F WEAK POINT F3 TEST CARRY OUT 3D CHECKS.
R-22AT R-24AT 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 approximately 60Ω. Resistance of Antenna motor should be approximately 8.8 kΩ. If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS.
R-22AT R-24AT 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) Cooking is not possible. N KEY UNIT TEST CARRY OUT 3D CHECKS.
R-22AT R-24AT TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at POWER terminal of CPU connector (CN-A). Check supply voltage and oven power cord. 2 The rated AC voltage is present at primary side of touch control transformer. Touch control transformer or secondary circuit defective. Check and repair. 3 Fuse on the PWB is open. Replace the fuse with new one.
R-22AT R-24AT TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL 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. The touch control section consists of the following units as shown in the touch control panel circuit.
R-22AT R-24AT DESCRIPTION OF LSI LSI(IXA222DR) The I/O signal of the LSI(IXA222DR) is detailed in the following table. Pin No. 1 Signal VCC I/O IN 2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -35V. Vp voltage of power source circuit input. 3 AVSS IN Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V) 4 VREF IN Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI.
R-22AT R-24AT Pin No. 19 Signal I/O P47 OUT Description Signal to sound buzzer. This signal is to control the 2.5kHz continuous signal. A: Switch touch sound. B: Guidance sound. C: Completion sound. 0.12 sec GND A -5V 1.2 sec B C T 200 sec. 20-21 22 23-24 25 P46-P45 - P44 OUT P43-P42 - INT1 IN 2.4 sec 1.2 sec 200 sec. Terminal not used. Oven lamp, Blower motor and Antenna motor driving signal (Square Waveform : 50Hz). During cooking To turn on and off the shut-off relay (RY1).
R-22AT R-24AT Pin No. Signal I/O Description §(50Hz) GND -31(V) 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. P05 .................... 5th. P04 .................... 6th.
R-22AT R-24AT 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. FUNCTIONAL DIAGRAM (3) Vcc (4) Vss H.V.
R-22AT R-24AT 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 PROCEDURE FOR ENTERING TO I-2 When the control unit or I-2 is exchanged, re-enter the constants of EXPRESS DEFROST, the memory information and the EEPROM data, referring to the following procedures. 2) How to enter the memory information Example : Suppose cooking time 5 sec. and output power 100% are entered into the memory pad 1. If not so, the oven will not operate correctly.
R-22AT R-24AT 2) How to clear all counter(user and service) and total cooking time and used time of filter. PAD ORDER (Door close) SET SET DOUBLE QUANTITY CHECK SIGNAL SET DISPLAY • • "NUMBER" • "NUMBER" • DOUBLE PHONE "NUMBER" • DOUBLE "NUMBER" • DOUBLE • PRECAUTIONS 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.
R-22AT R-24AT COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. 2. 3. 4. 5. 6. Door does not close firmly. Door hinge, support or latch hook is damaged. The door gasket or seal is damaged. The door is bent or warped. There are defective parts in the door interlock system. There are defective parts in the microwave generating and transmission assembly. 7.
R-22AT R-24AT 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). 8. Disconnect the main wire harness from high voltage transformer(s). 9. Remove two (2) screws holding each power transformer to base plate. 10.Remove the high voltage transformer(s) from base plate. 12.Now, high voltage transformer(s) are free.
R-22AT R-24AT CAUTION: 1. DISCHARGE THE TWO HIGH VOLTAGE CAPACITORS BEFORE TOUCHING ANY OVEN COMPONENTS 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 RECTIFIER ASSEMBLY AND THE HIGH VOLTAGE CAPACITOR, THE CATHODE (EARTH) SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A EARTHING SCREW. BLOWER MOTOR REMOVAL 1. CARRY OUT 3D CHECKS. 2. Remove the rear cabinet, too. 3.
R-22AT R-24AT Installation 1. Insert the receptacle into terminal insulator. 2. Close covers of the terminal insulator, as shown illustlated below. COVERS Flat type screw driver Terminal insulator RECEPTACLE CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL Replacement of individual component is as follows: CONTROL PANEL ASSEMBLY REMOVAL The complete control panel should be removed for replacement of components. To remove the control panel, proceed as follows: 1. Disconnect the oven from power supply.
R-22AT R-24AT 5. Remove the power supply cord. Re-install 1. Insert the power supply cord into the cord bushing. 2. Connect the brown and blue wires of power supply cord into the terminals of noise filter, referring to pictorial diagram. 3. Install the green/yellow wire of power supply cord with the one (1) screw. 4. Re-install the cord bushing to the rear cabinet. 5. CARRY OUT 4R CHECKS. Power supply cord Cord bushing Screw Green/Yellow wire Brown wire Noise filter L N Blue wire Figure C-4.
R-22AT R-24AT 5. Now, door assembly is free. 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 meter. (Refer to Microwave Measurement Procedure.) NOTE: When individual parts are replaced, refer to "Door Disassembly". RE-INSTALL 1. Insert the upper and lower oven hinges into door hinge pins. 2.
R-22AT R-24AT UPPER AND LOWER LATCH HEADS REMOVAL 7. Remove the door release lever from the door assembly. 8. Remove the three (3) screws holding the joint plate to the door panel. 9. Release the latch spring from the tab of the joint lever and joint plate. 10.Release the latch heads from joint lever and joint plate. 11.Now, the latch heads are free. JUSTMENT". 2. Remove choke cover from door panel, referring to "CHOKE COVER REMOVAL". 3.
R-22AT R-24AT MICROWAVE 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/m2 (equivalent to 5 mW/cm2 ) at a distance of 5 cm from the oven.
CN-A 1 SW2: INTERLOCK SWITCH 32 TH3: EXHAUST THERMISTOR 4 5 3 2 1 TH1: MAGNETRON THERMISTOR (Upper) TF1: TEMP. FUSE 150°C (Upper Mag.) NOISE FILTER TF1: TEMP. FUSE 150°C (Lower Mag.) TH2: MAGNETRON THERMISTOR (Lower) C1: H.V. CAPACITOR 0.94µF/ AC2300V F4: H.V.FUSE 0.80 A C2: H.V. CAPACITOR 0.94µF/ AC2300V F5: H.V.FUSE 0.80 A SW1: INTERLOCK SWITCH Figure O-2 Oven Schematic-IDLE Condition (Door opened condition) MG2: MAGNETRON (Lower) C2: H.V. CAPACITOR 0.
ANTENNA MOTOR NOISE SUPPRESSION COIL F3 : WEAK POINT A017 1 SW2: INTERLOCK SWITCH 33 TH3: EXHAUST THERMISTOR 5 4 TH2: MAGNETRON THERMISTOR (Lower) 3 2 1 TH1: MAGNETRON THERMISTOR (Upper) SW1: INTERLOCK SWITCH Figure O-3 Oven Schematic-Cooking Condition F4: H.V.FUSE 0.80 A F5: H.V.FUSE 0.80 A C1: H.V. CAPACITOR 0.94µF/ AC2300V C2: H.V. CAPACITOR 0.94µF/ AC2300V MG1: MAGNETRON (Upper) H. V. RECTIFIER T1: HIGH VOLTAGE TRANSFORMER (Front) TF1: TEMP. FUSE 150°C (Lower Mag.
1 1 I-1 1 2 CN-G 12 5 CN-C 1 6 CN-B 1 1 3 34 CN-A RY1 5 4 8 GRN CN-A 1 BLK 2 3 RED 4 5 YLW BRN BRN (Blue case) (Blue case) (Blue case) RED (Blue case) RED BRN BRN RED 6 GRN 5 4 3 2 1 ORG NO BLU GRN GRN WHT WHT ORG COM. SW5 : STOP SWITCH NO COM. SW1: INTERLOCK SWITCH (Cabinet side) COM. COM. NO (Blue case) WHT WHT BLU SW2: INTERLOCK SWITCH (Oven side) (Blue case) COM. F4: H.V. FUSE B L K SM: ANTENNA MOTOR (Lower) O R G T2 : HIGH VOLTAGE TRANSFORMER F5: H.V.
3 35 4 5 OL COM M2 COM M1 RY1 D81 H 6 :IF NOT SPECIFIED 1/4W ±5% RY4 DU24D1-1PR(M) RY3 DU24D1-1PR(M) FTR-F3AA024E 2.5A F1 VRS1 470V D2 D3 1W 150 R3 R70 100 :IF NOT SPECIFIED 1SS133 DTB143ES HZ16-1 C3 R60 33K C80 50V/0.1uF 270/1W Q11 2SB953 R2 50V/10uF C4 5 Oven TH C5 4 4.7K x3 C22 4.7K R22 1 Q3 KIA79L05P 3 2 2 MG. TH1 3 MG. TH2 C9 50V/10uF 1 2 3 4 33K VC 1 C63 C62 33K C60 C31 C30 4.
R-22AT R-24AT 1 2 3 4 5 6 A A B B C C D D E E RED F F BLACK 2.5A FUSE G G H H Figure S-3.
R-22AT R-24AT 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-22AT R-24AT REF. NO. F1 I- 1 I- 2 Q2 Q3 Q11 Q20 Q40 Q41 Q80 Q81 Q86-87 R1 R2 R3 R5 R6 R21 R22 R30 R31 R32 R33 R40 R41 R42 R43 R60 R62-63 R62-63 R64-65 R67 R70 R71 R90-98 J1 J2 J3 J4 RY1 RY3-4 VRS1 ZD1 ZD2 3- 2 3- 2-1 3- 2-2 3- 2-3 3- 2-4 3- 2-5 3- 3 3- 4 3- 5 3- 6 PART NO.
R-22AT R-24AT REF. NO. ∆ 4-24 4-25 4-26 4-27 4-28 4-29 4-30 4-31 4-32 4-33 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 4-42 PART NO.
R-22AT R-24AT REF. NO. 7-18 7-19 7-20 7-21 7-22 7-23 PART NO. XWSS740-10000 XFTS740P12000 LX-BZA150WREZ XCHWW40P08000 XCPS730P10000 XBPS730P28KS0 DESCRIPTION Washer: Screw : Special Screw : Screw : Screw : 4mm x 4mm x screw 4mm x 3mm x 3mm x Q'TY 1 1 1 2 2 2 1mm 12mm 8mm 10mm 28mm 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.
R-22AT R-24AT 1 2 3 4 5 6 OVEN AND CABINET PARTS A A 7-6 6-7 2-4 7-21 4-20 2-2 7-6 4-23 2-4-1 7-3 4-30 6-12 4-33 7-2 7-6 2-3 7-6 1-1 2-4-2 B B 4-12 7-6 7-6 1-22 7-4 7-19 7-6 7-6 7-6 2-5 7-14 7-6 6-14 7-18 7-6 7-2 4-26 7-17 4-39 6-6 C C 4-2 1-20 4-38 7-2 7-6 4-28 4-13 7-5 4-29 1-1 7-6 D A2 1-12 7-2 7-5 1-19 7-8 4-21 7-1 x2 7-13 7-6 4-27 1-13 1-2 7-6 4-25 7-12 A1 4-18 D A1 B 7-15 B A2 4-40 4-37 1-21 4-3 4-24 D 1-11 1-8 7-5 C 7-13
R-22AT R-24AT 2 1 A 3 4 5 6 A CONTROL PANEL PARTS 3-2 3-2-4 B B 3-1 3-2-2 3-4 3-2-3 C C 3-2-5 DOOR PARTS 3-5 3-6 3-3 5-4 5-10 D D 3-2-1 5-14 5-1 5-13 5 5-13 5-15 E E 5-8 5-6 5-18 5-13 5-16 5-17 5-9 5-7 F F MISCELLANEOUS 5-6 5-11 5-13 6-3 5-5 5-2 5-12 G 5-19 5-20 5-3 G 5-11 6-4 6-9 H 6-13 1 H Actual wire harness may be different from illustration. 2 3 4 5 6 '05SHARP CORP. (1S0.