Printed Circuit Board - Daewoo KOR-971M0A Service Manual

PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE
1) Low Voltage Transformer (DMR-604P) Check.
The low voltage transformer is located on the P.C.B.
Measuring condition : Input voltage ; 120V
Measuring condition : Frequency ; 60Hz
1
2
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NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source
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@ @ NOTE 2 : The allowable tolerance of the secondary voltage is within ¡ 5% of norminal voltage.
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2) Voltage Check
KEY CHECK POINT
NO. CHECK POINT
1 IC1 PIN 6,10,11
2 IC1 PIN 1
3 IC1 PIN 22
4 IC1 PIN 8 or 9
5 DP1 PIN 1 & 25
CHECK METHOD
MEASURE POINT
NO.
(See Page 45.)
1 MP 1
3 MP 2
3 MP 3
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NOTE : Each measure point must be measured with GND points
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10
8
7
6
-5VDC
-20VDC
0V
-14V
0V
- 5V
2.4VAC (DISPLAY FILAMENT VOLTAGE)
WAVEFORM
DC -5 ¡ 0.25V
DC -24 ¡ 1.0V
DC -30 ¡ 1.0V
58
Voltage
Terminal
6 - 17
8 - 10
REMARK
T
T
T:250nS
REMEDY
Replace ZD2, EC1, EC2
Replace R22, R25
Replace R21, R22, EC5
LOAD NO LOAD
24V 30V
2.4V 2.5V
T: 16.67 ms (60Hz)
REMARK
NO LOAD
NO LOAD
NO LOAD
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