Manuals / Sharp / Kitchen Appliance / Microwave Oven

Sharp Figure S-3. Printed Wiring Board, BLACK 2.5A FUSE, A B C D E F G H, R-22AT R-24AT

Models: R-22AT R-24AT

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R-22AT

R-24AT

A

RED

BLACK 2.5A

FUSE

Figure S-3. Printed Wiring Board

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Image 38

Sharp service manual Figure S-3. Printed Wiring Board, BLACK 2.5A FUSE, A B C D E F G H, R-22AT R-24AT

Contents

COMMERCIAL MICROWAVE OVEN TABLE OF CONTENTSSHARP CORPORATION MODELS R-22ATREMEMBER TO CHECK 3D WARNING TO SERVICE PERSONNELSERVICING WARNING AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORSGENERAL IMPORTANT INFORMATION SHARP CORPORATION OSAKA, JAPANCOMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT MICROWAVE RADIATIONTHIS APPLIANCE MUST BE EARTHED SPECIFICATIONDESCRIPTION PRODUCT DESCRIPTIONAPPEARANCE VIEW INSTALLATION INFORMATIONDISPLAY AND INDICATORS AUTO TOUCH CONTROL PANELMICROWAVE COOKING CONDITION OPERATION SEQUENCEIDLE CONDITION MICROWAVE VARIABLE COOKINGFigure B-2. Operation of Magnetron TWO MAGNETRON OPERATION SYSTEMFigure B-1. High Voltage Circuit MAGNETRON TEMPERATURE FUSES TF1, TF2 INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5MONITOR SWITCHES SW3, SW4 EXHAUST TEMPERATURE FUSE TF3MAGNETRON THERMISTORS TH1, TH2 TROUBLESHOOTING GUIDEEXHAUST OVEN THERMISTOR TH3 BLOWER MOTOR BMTESTPROCEDURE POSSIBLE CAUSE AND DEFECTIVE PARTSMICROWAVE OUTPUT POWER 1 litre water load TEST PROCEDURESPROCEDURE LETTERTEST PROCEDURES powerMICROWAVE OUTPUT POWER 2000 cc alternative method PROCEDUREB HIGH VOLTAGE TRANSFORMER TEST C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST CARRY OUT 3D CHECKSE SWITCH TEST CARRY OUT 4R CHECKSF WEAK POINT F3 TEST CARRY OUT 3D CHECKS CAUTION Only replace weak point F3 with the correct value replacementH TEMPERATURE FUSE TF1, TF2, TF3 TEST G FUSE F1, F2 F10A TEST CARRY OUT 3D CHECKSJ MOTOR WINDING TEST M TOUCH CONTROL PANEL ASSEMBLY TEST3. CARRY OUT 4R CHECKS K NOISE FILTER TESTTEST PROCEDURES N KEY UNIT TESTO RELAY TEST PROCEDURELETTER TEST PROCEDURESPROCEDURE COMPONENT TEST2 Reset Circuit TOUCH CONTROL PANEL ASSEMBLY1 Power Supply Circuit 11 Stop Switch CircuitTemperature measurement input EXHAUST THERMISTOR SignalPower source voltage GND Temperature measurement input MAGNETRON THERMISTOR TH2Internal clock oscillation frequency setting input Signal to sound buzzerSignal synchronized with commercial power source frequency Power source voltageSound Voltage level control terminal Digit selection signalKey strobe signal SignalSERVICING Figure T-2. Relation between Pin Nos, and Signals2-2 Memory IC 2. Shapes of Electronic Components4. Servicing Tools PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN5. Other Precautions PROCEDURE FOR ENTERING TO OTHER CHECKING AND CLEARING PROCE- DURE FOR1. Employing lead-free solder PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 3. Solderingprecautions COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREOUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL To remove rear cabinet and power supply cordRe-install MAGNETRON THERMISTOR REPLACEMENTASSEMBLY REMOVAL Figure C-1. Magnetron thermistor installationProcedure HOW TO RELEASE THE POSITIVE LOCK CONNECTORTERMINAL INSULATOR REPLACEMENT Figure C-2. How to release the positive lock connectorCONTROL PANEL ASSEMBLY REMOVAL CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVALPOWER SUPPLY CORD REPLACEMENT HOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEETDOOR REPLACEMENT AND ADJUSTMENT INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVALINTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT Figure C-4. Power supply cord replacementNote After any service to the door DOOR DISASSEMBLYRE-INSTALL DOOR ADJUSTMENTDOOR CASE REMOVAL SERVICE INFORMATIONUPPER AND LOWER LATCH HEADS REMOVAL DOOR GLASS REMOVALPREPARATION PROCEDUREMICROWAVE MEASUREMENT SCHEMATIC NOTE CONDITION OF OVEN Figure O-1 Oven Schematic-OFF ConditionFigure O-2 Oven Schematic-IDLE Condition Door opened condition SCHEMATIC NOTE CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR CLOSED2. MANUAL REPEAT KEY TOUCHED 3. COOKING TIME PROGREMMED Figure O-3 Oven Schematic-Cooking ConditionSCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED 4. START PAD TOUCHEDA B C Figure S-1. Pictrorial DiagramCOMPONENTS VOLTAGEPanelCircuit Control2A B C D E F G H Figure S-3. Printed Wiring BoardBLACK 2.5A FUSE A B C D EThe parts marked * are used in voltage more than PARTS LISTNote The parts marked ∆ may cause undue microwave exposure ELECTORIC PARTSDESCRIPTION OVEN PARTSREF. NO CODESCRE,NUTS AND WASHERS DOOR PARTSMISCELLANEOUS REF. NO1. MODEL NUMBER 2. REF. NO PACKING AND ACCESSORIESHOW TO ORDER REPLACEMENT PARTS 4. DESCRIPTIONA2 A1 OVEN AND CABINET PARTSF G H MISCELLANEOUS CONTROL PANEL PARTSDOOR PARTS 3-2-2 3-2-3