Daewoo KOG-373R0S Printed Circuit Board KOG-371G/H0S, KOG-391G/H0S, Low voltage transformer check

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PRINTED CIRCUIT BOARD <KOG-371G/H0S, KOG-391G/H0S>

1. CIRCUIT CHECK PROCEDURE

1.Low voltage transformer check

The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz

Terminal Voltage	LOAD	NO LOAD

4-7	AC 25.8 V	AC 28.4 V

NOTE

1.Refer to Ciruit Diagram (point 4).

2.Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.

3.The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.

2.Voltage Check - Key check point

NO	CHECK POINT	REMARK

1	IC1 PIN 2, 21, 30, 34	-5VDC

2	IC1 PIN 35

T : 20ms(50Hz)

3

IC1 PIN 31 OR 32

T : 250 ns(4MHz)

- Check method

NO	MEASURE POINT	WAVE FORM	REMEDY	REMARK

1	MP1	DC -5V±0.25V	Replace VL1, EC1	NO LOAD

2	MP2	DC -12V±2.0V	Replace EC2, D12,13,14	NO LOAD

NOTE

Each measure point must be measured with GND points.

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Contents Microwave Oven Table of Contents For Safe Service Procedures Safety and PrecautionsFor Safe Operation KOG-376T1S KOG-396T1S SpecificationsModel KOG-391G/H/R0SExternal View Outer Dimension465 360 Heating Element Oven Cavity Sefety Interlock System Feature DiagramKOG-376T1S, KOG-396T1S KOG-371R0S, KOG-391R0S KOG-374R0S KOG-375R0S KOG-373R0S, KOG-393R0S KOG-371G0S, KOG-391G0S Control PanelKOG-371H0S, KOG-391H0S KOG-376T1S, KOG-396T1S Grill/Combi Stop/Clear Stop/Clear Start/Easy Cook Auto cook Earthing Instructions InstallationOperation and Functions Wattage output chartDisassembly and Assembly To remove cabinet To remove door assemblyREF. no Part Code Part Name Description QTY Remark To remove door partsPage Frame Door ABS Page Decorator DOOR*T REF no Part Code Part Name Description ’TY RemarkPage 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 To remove high voltage capacitor High voltage circuit wiring To remove magnetronTo remove H.V.transformer To remove wind guide assemblyTo remove heater assmbly To remove tray motorTo remove heater parts Adjustment Interlock Mechanism and AdjustmentInterlock Mechanism and Adjustment Check Result Trouble Shooting GuideCheck Check Result Cause Cause Remedy Heating time for power output ProcedureMeasurement and Test Microwave Radiation Test Magnetron High voltage transformerHigh voltage capacitor High voltage diodeWiring Diagram KOG-396T1S Check Point Remark Printed Circuit Board KOG-371G/H0S, KOG-391G/H0SLow voltage transformer check Voltage Check Key check pointMesurement point Close GND Check no Hethod Remedy Point State Relay 2 on 5VDC GND Relay 2 OFFPoint State Relay 1 on 5VDC GND Point StateC.B. Circuit Diagram C.B. Location no Name Symbol Specification Part Code ’TYR15 6W 10K 5% Wave Form Remedy Remark Printed Circuit Board KOG-376T1S, KOG-396T1SMesurement point Point State Relay 3 on 5VDC GND 24VDCC.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 Printed Circuit Board KOG-374R0S, KOG-375R0S Circuit Check ProcedureMesurement 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 Total Assembly Exploded View and Parts List KOG-371G/H/R0S, KOG-391G/H/R0SREF 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