R-340A SERVICE MANUAL S7717R340APHR MICROWAVE OVEN COOK KG DEF HELP INSTANT ACTION To adjust quantity - touch pad again BEVERAGE REHEAT PIE REHEAT PIZZA FRESH VEGETABLES FROZEN VEGETABLES JACKET POTATO RICE MODEL REHEAT PORRIDGE R-340A 1. SREAK / CHOPS 2. 3. ROAST MEAT POUL TRY 4.
R-340A
R-340A SERVICE MANUAL PRODUCT SPECIFICATIONS MICROWAVE OVEN APPEARANCE VIEW R-340A 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-340A PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 220 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.
R-340A 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.Wave guide cover 12.Power supply cord 13.Rating label 14.Turntable tray 15.
R-340A OPERATION SEQUENCE OFF CONDITION opened after the cooking cycle has been interrupted, 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 and 2nd. interlock relay control switch). IMPORTANT When the oven door is closed, the monitor switch contacts (COM-NC) must be open. When the microwave oven is plugged in a wall outlet, rated voltage is supplied to the control unit. 6.
R-340A FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM HIGH VOLTAGE FUSE 0.75A The door is opened by pushing the open button on the control panel, refer to the Figure D-1. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the the latch head. The latch heads are moved upward and released from latch hook. Now the door will open. The high voltage fuse blows when the high voltage rectifier or the magnetron is shorted.
R-340A SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage harness. REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1) Disconnect the supply. 2) Door opened, and wedged open. 3) Discharge high voltage capacitor.
R-340A CK = Check / RE = Replace Home fuse blows when power supply cord is plugged into wall outlet. FUSE M10A 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. (Display appears) Oven lamp does not light (Display appears.
R-340A 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-340A TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Initial temperature............................................................................................. T1 = 11°C Temperature after (42 + 2) = 44 sec. ................................................................ T2 = 21°C Temperature difference Cold-Warm ............................................................... ∆T1 = 10°C Measured output power The equation is “P = 100 x ∆T” ............................................
R-340A TEST PROCEDURES PROCEDURE LETTER D COMPONENT TEST HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. 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.
R-340A 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 390 Ω Turntable motor Approximately 16.08 kΩ If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS. I BLOWN FUSE F M10A CARRY OUT 3D CHECKS. 1.
R-340A TEST PROCEDURES PROCEDURE LETTER L COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
R-340A TEST PROCEDURES PROCEDURE LETTER N COMPONENT TEST RELAY TEST Remove the outer case and check voltage between Pin No 3 of the 2-pin connector (A) and the common terminal of the relay RY2 on the power unit with an A.C. voltmeter. The meter should indicate 220 volts, if not check oven circuit. RY1 and RY2 Relay Test These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation or convection cooking operation. DC.
R-340A TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 3) Power Source Circuit This circuit generates voltages necessary in the control unit from the AC line voltage. 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 CPU Unit).
R-340A Pin No. 13 14 Signal P55 I/O OUT Description Terminal not used. P54 OUT Signal to sound buzzer (2.0 kHz). 0.12 sec. H : GND A A: key touch sound. L : -5V 2.4 sec. B: Completion sound. H : GND B L : -5V 15 P53 OUT Magnetron high-voltage circuit driving signal. To turn on and off the cook relay (RY2). The signals holds "L" level during microwave cooking and "H" level while not cooking.
R-340A Pin No. 36 Signal P24 I/O OUT Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G6 line keys on key matrix is touched. 37 P23 OUT Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G5 line keys on key matrix is touched. 38 P22 OUT Key strobe signal. Signal applied to touch-key section.
R-340A 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-340A COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. CARRY OUT 3D CHECKS. 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 push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click’ as the door switches operate.) 3.
R-340A HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR 7. Remove one (1) screw holding capacitor holder to the oven cavity rear plate. 8. Remove one (1) screw holding high voltage rectifier assembly to capacitor holder. 9. Disconnect rectifier terminal from capacitor. 10.Disconnect wire leads and high voltage fuse from capacitor and remove capacitor holder. 11.High voltage rectifier assembly, high voltage fuse and high voltage capacitor are free now.
R-340A CONTROL PANEL ASSEMBLY REMOVAL Solder CPU unit 1. CARRY OUT 3D CHECKS. 2. Disconnect the wire leads from panel components. 3. Make one (1) tab of the oven cavity front plate straight holding the control panel assembly to the oven flange. 4. Slide the control panel assembly upward and remove it. 5. Now, individual components can be removed. NOTE: 1. Before attaching a new key unit, wipe off remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol. 2.
R-340A 3) Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet. CAUTION: * Do not hit the fan blade strongly when installed because the bracket may be disfigured. * Make sure that the fan blade rotates smooth after installation. * Make sure that the axis of the shaft is not slanted. 3. Catch three holes of fan duct on three tabs of the waveguide flange. 4.
R-340A 1ST. LATCH SWITCH, 2ND. INTERLOCK RERAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT 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. (Refer to Microwave Measurement Procedure.
R-340A 3 4 Pin Upper oven hinge View; front side of door frame 19.Now, door screen is free. Door panel RE-INSTALL 1. Re-install door screen to door frame by reversing the procedure of item 18 of "REMOVAL". 2. 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. 3. Re-install door panel to door frame by fitting nine (9) tabs of door frame to nine (9) holes of door panel. 4.
R-340A 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.
N 220V THERMAL CUT-OUT 95˚C (MG) 2ND INTERLOCK RELAY CONTROL SWITCH 25 1ST. LATCH SWITCH Figure O-2. Oven Schematic-Cooking Condition TTM N.O. H.V. RECTIFIER THERMAL CUT-OUT 125˚C (OVEN) CAPACITOR 1.07µ AC2200V NOISE FILTER MAGNETRON H.V. RECTIFIER CAPACITOR 1.07µ AC2200V MAGNETRON POWER TRANSFORMER MONITOR RESISTOR 0.8/20W A1 N.O. H.V. FUSE 0.75 A MONITOR SWITCH TTM FM RY-1 RY-2 L NOISE FILTER POWER TRANSFORMER MONITOR RESISTOR 0.
1 H 2 3 26 4 B L K 3 COM. CN-A N.O. RELAY RY2 T1 2 RED RED CN-B 1 N.C. 5 WHT TURNTABLE MOTOR RED GRY Figure S-1. Pictorial Diagram MONITOR RESISTOR E GRY WHT WHT GRY WHT BLK ORG GRY WHT GRY BLK RED RED WHT WHT 3 2 RED 1 L M10 A NOISE FILTER N BLU LIVE BRN G / Y EARTH POWER SUPPLY CORD HIGH VOLTAGE CAPACITOR NEUTRAL HIGH VOLTAGE TRANSFORMER H.V. FUSE MAGNETRON HIGH VOLTAGE COMPONENTS THERMAL CUT-OUT 95˚C (MG) 4 COM. 1ST LATCH SWITCH NO COM.
R-340A 2 1 4 3 LD1 LD2 LD3 LD4 LD5 LD1-LD5 A 6 5 A WH-1 VR R4 27 T1 A3 3 2 4 D4 C1 0.1µ/50v d D2 C a AC220V 50Hz B R5 4.7k D6 C1 D1 D3 VRS1 1 D5 Q2 2SA933 b + – C2 C2 1000µ/25v B D1-D4 11ES1 C3 C VR (J1) R3 750 1/2w c D TURNTABLE MOTOR OVEN LAMP A 1 FAN MOTOR MICRO C4 RY1 Jumper 6 150 SP1 D7 R6 3.3k C5 D C6 RY2 C7 N.O.
2 C2 C3 C4 GND VC INT 3 28 DOOR SWITCH C7 RY2 4 C9 C8 C6 RY1 BUZZER C 5 C1 C13 0.1µ /50v NOTE D22 MA152WA Q11 KRA101S C12 0.1µ /50v R12 R13 R14 5 D C11 0.1µ/50v R68 15k R69 15k R70 15k R71 15k 4 9 5 0 G9 G10 8 3 G6 G4 1 6 G5 2 7 R63 15k BEVERAGE G3 G H 6 KEY UNIT INSTANT FRESH JACKET REHEAT REHEAT G11 COOK DEFROST POTATO VEGETABLES PIE PIZZA START TIMER REHEAT STOP FROZEN G12 POWER RICE G12 VEGETABLES CLEAR LEVEL CLOCK PORRIDGE G7 G8 CF1 4.
R-340A 2 1 4 3 6 5 A A WH-1 1 B LD1 LD4 CN - C 9 4 5 (C3) B D7 E C5 1 (R1) 2 D (CN - B) DOOR SW (ZD1) C2 (7) E 1 (1) 7 6 1 1 TTM C1 VRS1 D4 D2 D1 F 3 4 D3 (4) RY2 HVT (RY3) DU OMIF OMIF DU G AC (COM) (J1) (3) 3 VH CN - A XH 3 AC F Q3 T1 FM RY1 OL E (J3) (J2) 6 (Q1) B E (R2/J4) (D9) D8 D SH-B SP1 C SH-A (GREEN) R6 1 2 WH-1 (C4) R3 Q2 2 3 B DIP D5 R5 0 00 1 1 C B LD5 E LD3 R4 D6 LD2 2 G F LOT NO.
R-340A 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-340A Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO.
R-340A 2 1 4 3 6 5 OVEN AND CABINET PARTS 2-1 7-5 A A 4-18 7-5 1-11 7-5 B B 1-10 4-9 7-1 7-3 1-4 7-4 4-10 7-2 1-13 1-8 C C 6-9 6-7 4-17 4-16 7-6 D D 4-7 1-5 7-3 7-3 4-8 4-15 7-6 6-5 4-12 7-5 7-1 E 1-17 1-1 E 1-6 4-13 4-14 4-1 7-1 7-5 1-2 1-12 4-4 4-3 2-2 1-1 4-11 F 1-7 1-15 7-6 1-3 4-2 7-1 x2 7-1 4-6 G 1-16 1-9 2-4 G 1-5 7-1 2-3 7-6 6-2 4-15 7-3 7-3 7-1 4-5 1-14 F 2-5 6-1 7-6 7-6 7-5 7-6 H 1 2 7-5 2-4 H 4 3 32 5 6
R-340A 2 1 4 3 6 5 3-7 CONTROL PANEL PARTS A A 3-1E 3-4 3-2 3-7 3-3 B B 3-1 3-3-1 3-7 C C 3-5 4-19 DOOR PARTS 3-6 D D 5-5 5-9 5 5-2 5-8 5-1 E E 5-3 5-4 F F 5-7 5-6 G G 6-3 MISCELLANEOUS H H 6-4 Actual wire harness may be different from illustration.
R-340A PACKING AND ACCESSORIES TOP PAD ASSEMBLY FPADBA311WRK0 DOOR PROTECTION SHEET SPADPA204WRE0 PLASTIC BAG SSAKHA034WRE0 PRINTING MATTER 6- 2 TURNTABLE TRAY BOTTOM PAD ASSEMBLY 6- 1 TURNTABLE SUPPORT FPADBA351WRK0 TRAY PACK INTO THE OVEN CAVITY SPADFA397WRE0 Not replaceable items. PACKING CASE SPAKCC931WRE0 '97SHARP CORP. (7K0.
