Power Supply Trouble Shooting Chart - Acer AC511 SERIES Service Manual

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
OK
CHECK START C.K.T
R928, R932, D911, D917
OK
CHECK T901 O/P
NG
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
CHECK BRIDGE
RECTIFIED CIRCUIT
NG
CHECK 80V, 60V, 15V
6.3V, -12V CIRCUIT OUTPUT
IC901 FAILURE
19
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
YES
CHECK THE 60V
OK
CHECK Q911
OK
IC401 29(ABOUT 11.5V)
CHECK Q901
CHECK IC401
NO
PIN 14, 15, 16, 28, B+
DRIVER
NG
CHECK D919
NG
Q911 FAILURE
OK