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Sharp R-2397 Kmagnetron Thermistor Test, Exhaust Thermistor Test, Intake Thermistor Test

Models: R-2397

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KMAGNETRON THERMISTOR TEST

R-2397

TEST PROCEDURES

PROCEDURE

COMPONENT TEST

LETTER

KMAGNETRON THERMISTOR TEST

CARRY OUT 3D CHECKS.

Disconnect connector-H from the CPU unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Room Temp.	Resistance
15˚C	Approx. 15.91 kΩ
20˚C	Approx. 13.04 kΩ
25˚C	Approx. 10.74 kΩ

If the meter does not indicate above resistance, replace the thermistor.

CARRY OUT 4R CHECKS.

EXHAUST THERMISTOR TEST

CARRY OUT 3D CHECKS.

Disconnect connector-B from the CPU unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Room Temp.	Resistance
15˚C	Approx. 77.45 kΩ
20˚C	Approx. 61.47 kΩ
25˚C	Approx. 49.12 kΩ

If the meter does not indicate above resistance, replace the thermistor.

CARRY OUT 4R CHECKS.

INTAKE THERMISTOR TEST

CARRY OUT 3D CHECKS.

Disconnect connector-D from the CPU unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Room Temp.	Resistance
15˚C	Approx. 15.88 kΩ
20˚C	Approx. 13.03 kΩ
25˚C	Approx. 10.74 kΩ

If the meter does not indicate above resistance, replace the thermistor.

CARRY OUT 4R CHECKS.

LMOTOR WINDING TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals.

Resistance of Blower motor should be approximately 52Ω.

Resistance of Stirrer motor should be approximately 8.8 kΩ.

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R CHECKS.

MNOISE FILTER TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of noise filter. Using an ohmmeter, check between the terminals as described in the following table.

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Sharp R-2397 Kmagnetron Thermistor Test, Exhaust Thermistor Test, Intake Thermistor Test, Lmotor Winding Test

Contents

SHARP CORPORATION TABLE OF CONTENTSCOMMERCIAL MICROWAVE OVEN MODEL R-2397 R-2397 COMMERCIAL R-2397 GENERAL IMPORTANT INFORMATION SHARP CORPORATION OSAKA, JAPANMICROWAVE RADIATION SPECIFICATION PRODUCT DESCRIPTIONGENERAL INFORMATION DESCRIPTIONINSTALLATION INFORMATION APPEARANCE VIEWOVEN AUTO TOUCH CONTROL PANELOPERATION SEQUENCE OFF CONDITIONMICROWAVE COOKING CONDITION MICROWAVE VARIABLE COOKINGMONITOR SWITCH FUNCTION OF IMPORTANT COMPONENTSDOOR OPEN MECHANISM MONITOR RESISTORFUSE F6.3A ASYMMETRIC RECTIFIEREXHAUST THERMISTOR INTAKE THERMISTORTROUBLESHOOTING GUIDE WARNING TO SERVICE PERSONNELSERVICING 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 PROCEDURE LETTER COMPONENT TESTBHIGH VOLTAGE TRANSFORMER TEST TEST PROCEDURESPROCEDURE COMPONENT TEST LETTER ESWITCH TESTDHIGH VOLTAGE CAPACITOR TESTCARRY OUT 3DCHECKS FWEAK POINT A018PROCEDURE LETTER COMPONENT TEST GWEAK POINT A017CARRY OUT 3DCHECKSHFUSE F6.3A TEST ITHERMAL CUT-OUTTESTCARRY OUT 3DCHECKSKMAGNETRON THERMISTOR TEST EXHAUST THERMISTOR TESTINTAKE THERMISTOR TEST LMOTOR WINDING TESTNTOUCH CONTROL PANEL ASSEMBLY TEST OKEY UNIT TESTTEST PROCEDURES PROCEDURE LETTER COMPONENT TESTTEST PROCEDURES CONTD COMPONENT TESTLETTER RELAY TEST1Power Supply Circuit 3Power SYNC Signal Generating Circuit11 Stop Switch Circuit 12 Exhaust Air Temperature Detecting CircuitTemperature measurement input EXHAUST THERMISTOR Temperature measurement input INTAKE THERMISTORMagnetron high-voltagecircuit driving signal Signal to sound buzzerSignal Power source voltageSignal coming from touch key Signal similar to R3Figure T-4Relation between Pin Nos, and Signals 2-2Memory IC IC2Sound Voltage level control terminal Signal5. Other Precautions SERVICING2. 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 MAGNETRON REMOVAL HIGH VOLTAGE TRANSFORMER REMOVALBLOWER MOTOR REMOVAL STIRRER MOTOR UPPER REMOVALCONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL HOW TO RELEASE THE POSITIVE LOCK CONNECTORCONTROL PANEL ASSEMBLY REMOVAL ProcedurePOWER SUPPLY CORD REPLACEMENT DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENTDOOR ADJUSTMENT CHOKE COVER REMOVALSERVICE INFORMATION PREPARATION FOR TESTINGMICROWAVE MEASUREMENT REQUIREMENTFigure O-2.Oven SChematic-ONCondition Figure O-1.Oven SChematic-OFFConditionR-2397 Figure S-1.Pictorial Diagram HIGH VOLTAGE COMPONENTS1 2 R-2397Circuit Figure S-2.ControlPanelFigure S-3.Printed Wiring Board PARTS LIST The parts marked * are used in voltage more thanELECTRIC PARTS CABINET PARTSThe parts marked * are used in voltage more than REF. NODESCRIPTION CODEOVEN PARTS DOOR PARTSThe parts marked * are used in voltage more than REF. NOMISCELLANEOUS SCRE, NUTS AND WASHERSThe parts marked * are used in voltage more than REF. NOPOWER SUPPLY CORD 1-28 RFIL-A004WRE01-28 RFIL-A004WRE0 1-29 RFIL-A002WRE0OVEN AND CABINET PARTS CONTROL PANEL PARTS DOOR PARTSDOOR PROTECTION SHEET * SPADPA552WRE0 DOOR PAD * SPADF0341WRE0TRAY HOLDER * SPADPA551WRE0 PRINTING MATER INSTRUCTION BOOKR-2397