PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE

1. Low Voltage Transformer check

The low voltage transformer is located on the P.C.B.

Measuring condition: input voltage : 120V/Frequency : 60Hz

Terminal Voltage

LOAD

NO LOAD

 

 

 

4-7

AC 25.8 V

AC 28.4 V

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.

2.Voltage check

• Key check point

NO

CHECK POINT

REMARK

1

IC 1

PIN 2, 21, 30, 34

-5 VDC

 

 

 

 

2

IC 1

PIN 35

 

T:16.7ms(60Hz)

3

IC 1 PIN 31 OR 32

T:250ns(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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Daewoo KOR-630A9A, KOR-630A1A, KOR-630A0A service manual Printed Circuit Board, Circuit Check Procedure, Check Point Remark

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