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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, -12V, 75V
BEAD SET ABNORMAL VARIABLE OUTPUT
NG NO
OK YES
NG
NG OK
OK
NG
OK
OK
OK
NG NG
OK
NG
OK
CHECK Q901
CHECK AC LINE
VOLT 120V OR 220V
CHECK LINE
RECTIFIED &
SMOOTHED VOLT
CHECK BRIDGE
RECTIFIED CIRCUIT
CHECK START
C.K.T
D909,Q904,R922
CHECK T901 O/P
CHECK 75V,- 12V,
15V, 6.3V CIRCUIT
CHECK IC901
IC901 FAILURE
CHECK F901,SW901
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
CHECK IC401
H-OSC SEE ITEM 1
CHECK 75V LINE
CHECK D919
CHECK Q901
CHECK Q911
Q911 FAILURE
CHECK IC401 # 28
(IT SHALL BE 11.5V)
Page
21
of
59
4V SERIES MANUAL
05.06.2002
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V
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C551.htm