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
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
NG
OK
CHECK LINE
RECTIFIED & SMOOTHED VOLT
CHECK F901,SW901NO
YES
CHECK IC401
CHECK 75V LINE
NG
OK
CHECK START C.K.T D909,Q904,R922
OK
NG
CHECK BRIDGE OK
RECTIFIED CIRCUIT
CHECK Q911
NG
OK
CHECK D919
Q911 FAILURE
CHEC (IT S
CHECK T901 O/P
NG
OK
CHECK IC901
NG
OK
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
