Manuals / Sharp / Kitchen Appliance / Microwave Oven

Sharp R-22AT, R-24AT service manual PanelCircuit, Control2

Models: R-22AT R-24AT

1 44

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Page 37

PanelCircuit

R-22AT R-24AT

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POWER

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DISPLAYTUBE

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23	24	25	26	27	28	29	30	31	32
P43	P42	INT1	INT0	RESET	P71	P70	XIN	XOUT	VSS

10K	R33		R32	2.7K
R31				C30	C31
15K				C30	C31
VCC	TEST	SCL	SDA	CAT24WC16PI
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R30	C75	4.7K
50V/10uF	C75	4.7K

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G5			15	16	Unit
G4	17	18	19	20	Key
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	G9		G10	G11	G12
	R95	4.7K R96	4.7K R97	4.7K R98	4.7K
	C98	C99	C100	C101	330Px4

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4.7K	33KR60	R62:(R22AT)2.7K	(R24AT)1.8K	(R22AT)2.7KR63:	(R24AT)1.8K	4	C-CN	S
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CN-B	VC					Door
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		D83		D84
	M1	COM		M2
		RED		BLACK

COM

:IFNOTSPECIFIED
0.01uF/16V		1/4W±5%
:IFNOTSPECIFIED		:IFNOTSPECIFIED

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Image 37

Sharp R-22AT, R-24AT service manual PanelCircuit, Control2

Contents

SHARP CORPORATION TABLE OF CONTENTSCOMMERCIAL MICROWAVE OVEN MODELS R-22ATSERVICING WARNING TO SERVICE PERSONNELREMEMBER TO CHECK 3D WARNING AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORSCOMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT SHARP CORPORATION OSAKA, JAPANGENERAL IMPORTANT INFORMATION MICROWAVE RADIATIONDESCRIPTION SPECIFICATIONTHIS APPLIANCE MUST BE EARTHED PRODUCT DESCRIPTIONDISPLAY AND INDICATORS INSTALLATION INFORMATIONAPPEARANCE VIEW AUTO TOUCH CONTROL PANELIDLE CONDITION OPERATION SEQUENCEMICROWAVE COOKING CONDITION MICROWAVE VARIABLE COOKINGFigure B-1. High Voltage Circuit TWO MAGNETRON OPERATION SYSTEMFigure B-2. Operation of Magnetron MONITOR SWITCHES SW3, SW4 INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5MAGNETRON TEMPERATURE FUSES TF1, TF2 EXHAUST TEMPERATURE FUSE TF3EXHAUST OVEN THERMISTOR TH3 TROUBLESHOOTING GUIDEMAGNETRON THERMISTORS TH1, TH2 BLOWER MOTOR BMPOSSIBLE CAUSE AND DEFECTIVE PARTS TESTPROCEDUREPROCEDURE TEST PROCEDURESMICROWAVE OUTPUT POWER 1 litre water load LETTERMICROWAVE OUTPUT POWER 2000 cc alternative method powerTEST PROCEDURES PROCEDUREE SWITCH TEST C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST CARRY OUT 3D CHECKSB HIGH VOLTAGE TRANSFORMER TEST CARRY OUT 4R CHECKSH TEMPERATURE FUSE TF1, TF2, TF3 TEST CAUTION Only replace weak point F3 with the correct value replacementF WEAK POINT F3 TEST CARRY OUT 3D CHECKS G FUSE F1, F2 F10A TEST CARRY OUT 3D CHECKS3. CARRY OUT 4R CHECKS M TOUCH CONTROL PANEL ASSEMBLY TESTJ MOTOR WINDING TEST K NOISE FILTER TESTO RELAY TEST N KEY UNIT TESTTEST PROCEDURES PROCEDUREPROCEDURE TEST PROCEDURESLETTER COMPONENT TEST1 Power Supply Circuit TOUCH CONTROL PANEL ASSEMBLY2 Reset Circuit 11 Stop Switch CircuitPower source voltage GND SignalTemperature measurement input EXHAUST THERMISTOR Temperature measurement input MAGNETRON THERMISTOR TH2Signal synchronized with commercial power source frequency Signal to sound buzzerInternal clock oscillation frequency setting input Power source voltageKey strobe signal Digit selection signalSound Voltage level control terminal Signal2-2 Memory IC Figure T-2. Relation between Pin Nos, and SignalsSERVICING 2. Shapes of Electronic Components5. Other Precautions PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN4. Servicing Tools OTHER CHECKING AND CLEARING PROCE- DURE FOR PROCEDURE FOR ENTERING TO2. Using lead-free wire solder PRECAUTIONS FOR USING LEAD-FREE SOLDER1. Employing lead-free solder 3. SolderingOUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREprecautions To remove rear cabinet and power supply cordASSEMBLY REMOVAL MAGNETRON THERMISTOR REPLACEMENTRe-install Figure C-1. Magnetron thermistor installationTERMINAL INSULATOR REPLACEMENT HOW TO RELEASE THE POSITIVE LOCK CONNECTORProcedure Figure C-2. How to release the positive lock connectorPOWER SUPPLY CORD REPLACEMENT CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVALCONTROL PANEL ASSEMBLY REMOVAL HOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEETINTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVALDOOR REPLACEMENT AND ADJUSTMENT Figure C-4. Power supply cord replacementRE-INSTALL DOOR DISASSEMBLYNote After any service to the door DOOR ADJUSTMENTUPPER AND LOWER LATCH HEADS REMOVAL SERVICE INFORMATIONDOOR CASE REMOVAL DOOR GLASS REMOVALMICROWAVE MEASUREMENT PROCEDUREPREPARATION Figure O-2 Oven Schematic-IDLE Condition Door opened condition Figure O-1 Oven Schematic-OFF ConditionSCHEMATIC NOTE CONDITION OF OVEN SCHEMATIC NOTE CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR CLOSEDSCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED Figure O-3 Oven Schematic-Cooking Condition2. MANUAL REPEAT KEY TOUCHED 3. COOKING TIME PROGREMMED 4. START PAD TOUCHEDCOMPONENTS Figure S-1. Pictrorial DiagramA B C VOLTAGEControl2 PanelCircuitBLACK 2.5A FUSE Figure S-3. Printed Wiring BoardA B C D E F G H A B C D ENote The parts marked ∆ may cause undue microwave exposure PARTS LISTThe parts marked * are used in voltage more than ELECTORIC PARTSREF. NO OVEN PARTSDESCRIPTION CODEMISCELLANEOUS DOOR PARTSSCRE,NUTS AND WASHERS REF. NOHOW TO ORDER REPLACEMENT PARTS PACKING AND ACCESSORIES1. MODEL NUMBER 2. REF. NO 4. DESCRIPTIONF G H OVEN AND CABINET PARTSA2 A1 DOOR PARTS CONTROL PANEL PARTSMISCELLANEOUS 3-2-2 3-2-3