6-9 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 90V - 160V
(DEPENDING UPON H.SYNC FREQUENCY)
(B) CONSTANT OUTPUT : 6.3V, 15V,
BEAD SET
CHECK AC LINE VOLT 120V OR 220V
NG
OK
CHECK LINE
RECTIFIED & SMOOTHED VOLT
NG
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
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| NO |
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| CHECK IC401 | |
| CHECK F901,SW901 |
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| YES |
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| CHECK 75V LINE |
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NG |
| CHECK D919 |
CHECK BRIDGE |
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OK |
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RECTIFIED CIRCUIT |
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OK
CHECK START C.K.T D909,Q904,R922
OK
CHECK T901 O/P
CHECK Q911
NG
OK
OK
Q911 FAILURE
CHE (IT S
NG
OK
CHECK IC901
NG
OK
CHECK 75V,- 12V, |
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| CHECK Q901 | ||
15V, | 6.3V CIRCUIT |
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NG |
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IC901 FAILURE
CHECK Q901