19
6-10 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A)
VARIABLE OUTPUT : 88V - 160V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B)
CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V
BEAD SET
ABNORMAL VARIABLE OUTPUT
NG
OK
NG
OK
OK
NG
NG
NG
OK
OK
OK
NG
OK
NG
YES
NO
CHECK BRIDGE
RECTIFIED CIRCUIT
6.3V CIRCUIT
CHECK START C.K.T
(IT SHALL BE 11.5V)
R923, R924
CHECK IC401
H-OSC SEE ITEM 1
CHECK D919
CHECK Q911
Q911 FAILURE
CHECK IC401 #29
CHECK Q901
CHECK IC901
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901, SW901
CHECK LINE RECTIFIED
& SMOOTHED VOLT
CHECK Q901
IC901 FAILURE
CHECK T901 O/P
MAKE SURE THAT
THE VARIABLE
OK
OUTPUT IS NOT SHORTED
CHECK 75V LINE
CHECK 75V, -12V, 15V
