Daewoo KOR-6Q2B5S Manuel de service télécharger pdf (Page 26)

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

2. Voltage check

Key check point

Check method

PRINTED CIRCUIT BOARD

NO CHECK POINT REMARK

1 IC 1 PIN 5 5 VDC

2 IC 1 PIN 8

3 IC 1 PIN 35 OR PIN 36

NOTE :

Each measure point must be measured with GND point.

NOTE :

1. Refer to Circuit 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.

Terminal Voltage

5-6-7

LOAD

AC 12.6 V

NO LOAD

AC 14.7 V

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, D11, D13, D14 NO LOAD

T:20ms(50Hz)

T:250ns(4MHz)

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Daewoo KOR-6Q2B5S Manuel de service Page 26