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6-10 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A)
BEAD SET
CHECK AC LINE
VOLT 120V OR 220V
NG
OK
CHECK LINE RECTIFIED
& SMOOTHED VOLT
NG
CHECK BRIDGE
RECTIFIED CIRCUIT
OK
CHECK START C.K.T
R928, R932, D911, D917
OK
CHECK T901 O/P
CHECK 80V, 60V, 15V
NG
6.3V, -12V CIRCUIT OUTPUT
OK
CHECK IC901
NG
OK
CHECK Q901
VARIABLE OUTPUT : 60.5V - 145V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B)
CONSTANT OUTPUT : 6.3V, 14.5V, -12V, 80V
CHECK F901, SW901
NG
CHECK Q901
IC901 FAILURE
19
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
CHECK IC401
NO
PIN 14, 15, 16, 28, B+
DRIVER
YES
CHECK THE 60V
NG
CHECK D919
OK
CHECK Q911
NG
Q911 FAILURE
OK
IC401 29(ABOUT 11.5V)
OK