Manuals / Sharp / Kitchen Appliance / Microwave Oven

Sharp Figure O-3 Oven Schematic-Cooking Condition, Start Pad Touched, R-22AT R-24AT, Control

Models: R-22AT R-24AT

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Page 35

SCHEMATIC

SCHEMATIC

NOTE: CONDITION OF OVEN

1.DOOR CLOSED.

2.MANUAL REPEAT KEY TOUCHED.

3.COOKING TIME PROGREMMED.

4.START PAD TOUCHED.

R-22AT R-24AT

	240V~50Hz		LIVE
230 -			BRN
			BLU




			NEUTRAL

GRN/YLW EARTH

NOISE FILTER

L

F3 : WEAK POINT A017		NOISE SUPPRESSION COIL	DISCHARGE RESISTOR 680 kΩ 1/2W	LINE CROSS CAPACITOR 0.22µF/ AC250V	DISCHARGE RESISTOR 10 MΩ 1/2W		LINE BYPASS CAPACITORLINE BYPASS CAPACITOR 10000 pF/ AC250V10000 pF/ AC250V

TF1: TEMP. FUSE 150°C

T1: HIGH VOLTAGE

TRANSFORMER

(Upper Mag.)

TOUCH CONTROL

SW4: MONITOR SWITCH

TF1:

TRANSFORMER

TEMP. FUSE 150°C

(Lower Mag.)

3

6

FUSE

2.5A

5

SW3: MONITOR SWITCH

4

SW5:

T3:

3

STOP

2

RELAY

RELAY

SWITCH

1

CONTROL

UNIT

RY4:

COOK

RY3:

COOK

TH3:

EXHAUST

HIGH VOLTAGE

TRANSFORMER

THERMISTOR

TH2:

5

MAGNETRON

THERMISTOR (Lower)

4

RY1

3

2

CN-A

1

TH1:

T2:

5

1

MAGNETRON

CN-A

THERMISTOR

(Upper)

F1: FUSE F10A

EXHAUST TEMP. FUSE

120°C

OVENLAMP

OL

SM ANTENNA

SM

BM

F2: FUSE F10A

(Front)
C1: H.V. CAPACITOR
0.94µF/ AC2300V
0.80 A	RECTIFIER
F4:
H.V.FUSE
	H. V.
(Rear)
C2: H.V. CAPACITOR
0.94µF/ AC2300V
F5:	RECTIFIER
H.V.FUSE
0.80 A	H. V.
	H. V.

MG1: MAGNETRON (Upper)

MG2: MAGNETRON (Lower)

N

TF3:	MOTOR	SW2:
		INTERLOCK SWITCH

		SW1:
		INTERLOCK SWITCH

Figure O-3 Oven Schematic-Cooking Condition

33

Image 35

Sharp Figure O-3 Oven Schematic-Cooking Condition, SCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED, R-22AT R-24AT

Contents

MODELS R-22AT TABLE OF CONTENTSSHARP CORPORATION COMMERCIAL MICROWAVE OVENWARNING AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORS WARNING TO SERVICE PERSONNELSERVICING REMEMBER TO CHECK 3DMICROWAVE RADIATION SHARP CORPORATION OSAKA, JAPANCOMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT GENERAL IMPORTANT INFORMATIONPRODUCT DESCRIPTION SPECIFICATIONDESCRIPTION THIS APPLIANCE MUST BE EARTHEDAUTO TOUCH CONTROL PANEL INSTALLATION INFORMATIONDISPLAY AND INDICATORS APPEARANCE VIEWMICROWAVE VARIABLE COOKING OPERATION SEQUENCEIDLE CONDITION MICROWAVE COOKING CONDITIONFigure B-2. Operation of Magnetron TWO MAGNETRON OPERATION SYSTEMFigure B-1. High Voltage Circuit DOOR OPEN MECHANISM INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5MONITOR SWITCHES SW3, SW4 FUNCTION OF IMPORTANT COMPONENTSBLOWER MOTOR BM TROUBLESHOOTING GUIDEEXHAUST OVEN THERMISTOR TH3 MAGNETRON THERMISTORS TH1, TH2POSSIBLE CAUSE AND DEFECTIVE PARTS TESTPROCEDURELETTER TEST PROCEDURESPROCEDURE MICROWAVE OUTPUT POWER 1 litre water loadPROCEDURE powerMICROWAVE OUTPUT POWER 2000 cc alternative method TEST PROCEDURESCARRY OUT 4R CHECKS C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST CARRY OUT 3D CHECKSE SWITCH TEST B HIGH VOLTAGE TRANSFORMER TESTH 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 CHECKSK NOISE FILTER TEST M TOUCH CONTROL PANEL ASSEMBLY TEST3. CARRY OUT 4R CHECKS J MOTOR WINDING TESTPROCEDURE N KEY UNIT TESTO RELAY TEST TEST PROCEDURESCOMPONENT TEST TEST PROCEDURESPROCEDURE LETTER11 Stop Switch Circuit TOUCH CONTROL PANEL ASSEMBLY1 Power Supply Circuit 2 Reset CircuitMagnetron MG2 high-voltage circuit driving signal SignalPower source voltage GND Magnetron MG1 high-voltage circuit driving signalPower source voltage Signal to sound buzzerSignal synchronized with commercial power source frequency Internal clock oscillation frequency setting inputSignal Digit selection signalKey strobe signal Sound Voltage level control terminal2. Shapes of Electronic Components Figure T-2. Relation between Pin Nos, and Signals2-2 Memory IC SERVICING4. Servicing Tools PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN5. Other Precautions OTHER CHECKING AND CLEARING PROCE- DURE FOR PROCEDURE FOR ENTERING TO3. Soldering PRECAUTIONS FOR USING LEAD-FREE SOLDER2. Using lead-free wire solder 1. Employing lead-free solderTo remove rear cabinet and power supply cord COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREOUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL precautionsFigure C-1. Magnetron thermistor installation MAGNETRON THERMISTOR REPLACEMENTASSEMBLY REMOVAL Re-installFigure C-2. How to release the positive lock connector HOW TO RELEASE THE POSITIVE LOCK CONNECTORTERMINAL INSULATOR REPLACEMENT ProcedureHOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEET CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVALPOWER SUPPLY CORD REPLACEMENT CONTROL PANEL ASSEMBLY REMOVALFigure C-4. Power supply cord replacement INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVALINTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT DOOR REPLACEMENT AND ADJUSTMENTDOOR ADJUSTMENT DOOR DISASSEMBLYRE-INSTALL Note After any service to the doorDOOR GLASS REMOVAL SERVICE INFORMATIONUPPER AND LOWER LATCH HEADS REMOVAL DOOR CASE REMOVALPREPARATION PROCEDUREMICROWAVE MEASUREMENT SCHEMATIC NOTE CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR CLOSED Figure O-1 Oven Schematic-OFF ConditionFigure O-2 Oven Schematic-IDLE Condition Door opened condition SCHEMATIC NOTE CONDITION OF OVEN4. START PAD TOUCHED Figure O-3 Oven Schematic-Cooking ConditionSCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED 2. MANUAL REPEAT KEY TOUCHED 3. COOKING TIME PROGREMMEDVOLTAGE Figure S-1. Pictrorial DiagramCOMPONENTS A B CControl2 PanelCircuitA B C D E Figure S-3. Printed Wiring BoardBLACK 2.5A FUSE A B C D E F G HELECTORIC PARTS PARTS LISTNote The parts marked ∆ may cause undue microwave exposure The parts marked * are used in voltage more thanCODE OVEN PARTSREF. NO DESCRIPTIONREF. NO DOOR PARTSMISCELLANEOUS SCRE,NUTS AND WASHERS4. DESCRIPTION PACKING AND ACCESSORIESHOW TO ORDER REPLACEMENT PARTS 1. MODEL NUMBER 2. REF. NOA2 A1 OVEN AND CABINET PARTSF G H 3-2-2 3-2-3 CONTROL PANEL PARTSDOOR PARTS MISCELLANEOUS