Daewoo KOG-375R0S, KOG-371H0S, KOG-373R0S, KOG-374R0S, KOG-393R0S, KOG-391H0S Check Result Cause

Page 48

(TROUBLE 3) No microwave oscillation even though fan motor rotates.

CONDITION

 

CHECK

 

RESULT

 

CAUSE

 

 

 

 

 

 

 

No

Check continuity of high

No

microwave

voltage fuse

Continuity

oscillation

 

 

 

Replace high voltage fuse

 

REMEDY

 

 

 

 

Continuity

Check continuity if high

 

 

 

 

 

voltage capacitor terminals

 

 

 

with wires removed

 

 

 

 

 

 

 

 

Check continuity of high voltage

 

 

 

 

Continuity in

 

 

 

 

rectifier in forward and backward

 

 

 

backward

direction with DC megger

 

 

 

direction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuity

Connect megger leads to

 

 

 

 

 

 

 

 

 

 

 

magnetron terminal and

 

 

 

 

magnetron body

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 Ω or ∞

Check resistance of primary and

 

 

 

 

 

 

 

 

 

 

 

secondary coil of high voltage

 

 

 

 

transformer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

Check continuity of magnetron

 

 

 

 

 

 

Continuity

with wires removed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

Check continuity of filament

 

 

 

 

 

 

Continuity

terminal of high voltage

 

 

 

 

 

 

 

transformer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 V

Check D.C. voltage being

 

 

 

 

 

 

 

 

 

 

 

supplied to RELAY (RY1) coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Approx

 

 

 

 

 

 

 

 

 

 

15 VDC

 

 

 

 

 

 

Defective high

voltage

transformer

Defective high voltage rectifier

Defective

magnetron

Defective high

voltage

transformer

Defective

magnetron

Defective high

voltage

transformer

Defective touch

control circuit

Faulty

contacts or

RELAY (RY1)

or open

relay coil

Replace

Replace

Replace

Replace

Replace

Replace

Replace

Replace

47

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Contents Microwave Oven Table of Contents Safety and Precautions For Safe Service ProceduresFor Safe Operation Specifications ModelKOG-391G/H/R0S KOG-376T1S KOG-396T1SOuter Dimension External View465 360 Feature Diagram Heating Element Oven Cavity Sefety Interlock SystemKOG-376T1S, KOG-396T1S KOG-371R0S, KOG-391R0S KOG-374R0S KOG-375R0S KOG-373R0S, KOG-393R0S Control Panel KOG-371G0S, KOG-391G0SKOG-371H0S, KOG-391H0S KOG-376T1S, KOG-396T1S Grill/Combi Stop/Clear Stop/Clear Start/Easy Cook Auto cook Installation Earthing InstructionsWattage output chart Operation and FunctionsDisassembly and Assembly To remove door assembly To remove cabinetTo remove door parts REF. no Part Code Part Name Description QTY RemarkPage Frame Door ABS Page REF no Part Code Part Name Description ’TY Remark Decorator DOOR*TPage Screw Tapping T2SN TRS 4X16 Mfzn Page BARRIER-SCREEN*0 SAN Page To remove control panel parts CONTROL-PANEL ABS Control Panel Knob Volume Button Function Button Fuction *A High voltage circuit wiring To remove magnetron To remove high voltage capacitorTo remove wind guide assembly To remove H.V.transformerTo remove tray motor To remove heater assmblyTo remove heater parts Interlock Mechanism and Adjustment AdjustmentInterlock Mechanism and Adjustment Trouble Shooting Guide Check ResultCheck Check Result Cause Cause Remedy Procedure Heating time for power outputMeasurement and Test Microwave Radiation Test High voltage transformer High voltage capacitorHigh voltage diode MagnetronWiring Diagram KOG-396T1S Printed Circuit Board KOG-371G/H0S, KOG-391G/H0S Low voltage transformer checkVoltage Check Key check point Check Point RemarkMesurement point Point State Relay 2 on 5VDC GND Relay 2 OFF Point State Relay 1 on 5VDC GNDPoint State Close GND Check no Hethod RemedyC.B. Circuit Diagram Name Symbol Specification Part Code ’TY C.B. Location noR15 6W 10K 5% Printed Circuit Board KOG-376T1S, KOG-396T1S Wave Form Remedy RemarkMesurement point 24VDC Point State Relay 3 on 5VDC GNDC.B. Circuit Diagram C.B. Location no KOG-396T1S Printed Circuit Board KOG-371R0S, KOG-391R0S Mesurement point Point State Relay 2 on 5VDC GND Relay 2 OFF C.B. Circuit Diagram Name Symbol Specification Part Code ’TY Remark J1~J17, SJ1 Circuit Check Procedure Printed Circuit Board KOG-374R0S, KOG-375R0SMesurement point Point State Relay 2 on 5VDC GND Relay 2 OFF C.B. Circuit Diagram Name Symbol Specification Part Code QTY Remark Printed Circuit Board KOG-373R0S, KOG-393R0S Mesurement point Point State Relay 2 on 5VDC GND Relay 2 OFF C.B. Circuit Diagram Wire Copper TIN Coating J3, J5~J10, SJ1 Exploded View and Parts List KOG-371G/H/R0S, KOG-391G/H/R0S Total AssemblyREF no Part Code Part Name Description QTY Foot KOR-86150S KOR-61150S Exploded View and Parts List KOG-376T1S, KOG-396T1S CONTROL-PANEL AS Special Screw TT3 TRS 4X8 FLG Mfzn KOG-396T1S Part Code Part Name Description Supply Remark Exploded View and Parts List KOG-374R0S Special Screw TT3 HEX 4X8 Mfzn Exploded View and Parts List KOG-375R0S KOG-375R0S Exploded View and Parts List KOG-373R0S, KOG-393R0S Heater AS Foot 100 101 Printed Date Dec
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