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Sharp R-2397 Letter Component Test, Bhigh Voltage Transformer Test, Test Procedures

Models: R-2397

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PROCEDURE

		R-2397
	TEST PROCEDURES

PROCEDURE
	LETTER COMPONENT TEST

	Initial temperature	T1 = 11°C
	Temperature after (25 + 3) = 28 sec	T2 = 21°C
	Temperature difference Cold-Warm	ΔT = 10°C
	Measured output power
	The equation is “P = 170 x ΔT”	P = 170 x 10°C = 1700 Watts

JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.

CAUTION: 1°C CORRESPONDS TO 170 WATTS. REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

1000g

1000g

1000g

T1˚C

T2˚C

Heat up for 28 sec.

BHIGH VOLTAGE TRANSFORMER TEST

WARNING: High voltages and large currents are present at the secondary winding and filament winding of 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. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be obtained:

a. Primary winding	approx. 1.06 Ω

b. Secondary winding	approx. 57.3 Ω

c. Filament winding	less than 1 Ω

If the reading obtained are not stated as above, then the high voltage transformer is probably faulty and should be replaced.

CARRY OUT 4R CHECKS.

CHIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST

CARRY OUT 3D CHECKS.

Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading.

The normal resistance is infinity in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS.	A

ASYMMETRIC RECTIFIER TEST

CARRY OUT 3D CHECKS.

D2		D1	B

ASYMMETRIC

RECTIFIER

CHIGH VOLTAGE RECTIFIER

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Sharp R-2397 service manual Letter Component Test, Bhigh Voltage Transformer Test, Test Procedures

Contents

SHARP CORPORATION TABLE OF CONTENTSCOMMERCIAL MICROWAVE OVEN MODEL R-2397 R-2397 COMMERCIAL R-2397 GENERAL IMPORTANT INFORMATION SHARP CORPORATION OSAKA, JAPANMICROWAVE RADIATION PRODUCT DESCRIPTION SPECIFICATIONGENERAL INFORMATION DESCRIPTIONAPPEARANCE VIEW INSTALLATION INFORMATIONOVEN AUTO TOUCH CONTROL PANELOFF CONDITION OPERATION SEQUENCEMICROWAVE COOKING CONDITION MICROWAVE VARIABLE COOKINGFUNCTION OF IMPORTANT COMPONENTS MONITOR SWITCHDOOR OPEN MECHANISM MONITOR RESISTORASYMMETRIC RECTIFIER FUSE F6.3AEXHAUST THERMISTOR INTAKE THERMISTORWARNING TO SERVICE PERSONNEL TROUBLESHOOTING GUIDESERVICING REMEMBER TO CHECK 3DTEST PROCEDURE POSSIBLE CAUSE AND DEFECTIVE PARTS MAGNETRON THERMAL CUT-OUT145˚C TC1 PROCEDURE COMPONENT TEST LETTER AMAGNETRON TEST TEST PROCEDURESMICROWAVE OUTPUT POWER IEC-705-1988 LETTER COMPONENT TEST PROCEDUREBHIGH VOLTAGE TRANSFORMER TEST TEST PROCEDURESESWITCH TEST PROCEDURE COMPONENT TEST LETTERDHIGH VOLTAGE CAPACITOR TESTCARRY OUT 3DCHECKS FWEAK POINT A018GWEAK POINT A017CARRY OUT 3DCHECKS PROCEDURE LETTER COMPONENT TESTHFUSE F6.3A TEST ITHERMAL CUT-OUTTESTCARRY OUT 3DCHECKSEXHAUST THERMISTOR TEST KMAGNETRON THERMISTOR TESTINTAKE THERMISTOR TEST LMOTOR WINDING TESTOKEY UNIT TEST NTOUCH CONTROL PANEL ASSEMBLY TESTTEST PROCEDURES PROCEDURE LETTER COMPONENT TESTCOMPONENT TEST TEST PROCEDURES CONTDLETTER RELAY TEST3Power SYNC Signal Generating Circuit 1Power Supply Circuit11 Stop Switch Circuit 1.Control UnitSignal to sound buzzer Magnetron high-voltagecircuit driving signalDESCRIPTION OF LSI LSIIZA646DRPower source voltage SignalSignal coming from touch key Signal similar to R32-2Memory IC IC2 Figure T-4Relation between Pin Nos, and SignalsSound Voltage level control terminal SignalSERVICING 5. Other Precautions2. Shapes of Electronic Components 3.Servicing of Touch Control PanelPROCEDURE FOR ENTERING TO IC-2 OTHER CHECKING AND CLEARING PRO CEDURE OUTER CASE REMOVAL COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREHIGH VOLTAGE COMPONENTS REMOVAL HIGH VOLTAGE TRANSFORMER REMOVAL MAGNETRON REMOVALBLOWER MOTOR REMOVAL STIRRER MOTOR UPPER REMOVALHOW TO RELEASE THE POSITIVE LOCK CONNECTOR CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVALCONTROL PANEL ASSEMBLY REMOVAL ProcedurePOWER SUPPLY CORD REPLACEMENT DOOR REPLACEMENT DOOR REPLACEMENT AND ADJUSTMENTDOOR ADJUSTMENT CHOKE COVER REMOVALPREPARATION FOR TESTING SERVICE INFORMATIONMICROWAVE MEASUREMENT REQUIREMENTFigure O-2.Oven SChematic-ONCondition Figure O-1.Oven SChematic-OFFConditionR-2397 HIGH VOLTAGE COMPONENTS Figure S-1.Pictorial Diagram1 2 R-2397Figure S-2.ControlPanel CircuitFigure S-3.Printed Wiring Board The parts marked * are used in voltage more than PARTS LISTELECTRIC PARTS CABINET PARTSREF. NO The parts marked * are used in voltage more thanDESCRIPTION CODEDOOR PARTS OVEN PARTSThe parts marked * are used in voltage more than REF. NOSCRE, NUTS AND WASHERS MISCELLANEOUSThe parts marked * are used in voltage more than REF. NO1-28 RFIL-A004WRE0 POWER SUPPLY CORD1-28 RFIL-A004WRE0 1-29 RFIL-A002WRE0OVEN AND CABINET PARTS DOOR PARTS CONTROL PANEL PARTSDOOR PAD * SPADF0341WRE0 DOOR PROTECTION SHEET * SPADPA552WRE0TRAY HOLDER * SPADPA551WRE0 PRINTING MATER INSTRUCTION BOOKR-2397