Printed Circuit Board - Daewoo KOR-122M0A Service Manual

PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE
1) Low Voltage Transformer (DMR-602P) Check.
The low voltage transformer is located on the P.C.B.
Measuring condition: Input voltage: 120V
1
2
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@ @ NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to fluctuation
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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 7, 41, 42
2 IC1 PIN 11
3 IC1 PIN 23
4 IC1 PIN 8 or 9
CHECK METHOD
NO. MEASURE POINT
1 MP1
2 MP2
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@ @ @ @ NOTE : Each measure point must be measured with GND points.
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Frequency: 60Hz
5
4
3
5VDC
GND
4.3V 0V
-14V
0V
5V
0V
-5V
0V
WAVE FORM
DC 5V ± 0.25
DC 14V ± 1.0
Voltage
Terminal
3-5
REMARK
T
T
T: 250ns
REMEDY
Replace VL1, EC1, C4, C6
Replace D13, D14, EC2
43
LOAD NO LOAD
27VAC 30VAC
T: 16.67 ms (60 Hz)
REMARK
NO LOAD
NO LOAD
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