6-12 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60V - 186V (DEPENDING UPON H.SYNC
FREQUENCY)
(B) CONSTANT OUTPUT : 7V, 20V, 29V, 54V, 80V
BEAD SET ABNORMAL VARIABLE OUTPUT
NG YES
OK NO
NG
OK
NG
OK
NG
OK
NG
NG
OK OK
OK
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901,SW901
CHECK LINE
RECTIFIED &
SMOOTHED VOLT
CHECK MAIN POWER
CKT.
CHECK D901, D902,
D903, D904
CHECK POWER
SAVING CKT(OFF
MODE)
CHECK T901 O/P
CHECK 80V,55V,14.5V,
6.3V CIRCUIT
CHECK MCU H-SYNC
V-SYNC IC901
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
CHECK IC401
PIN 4, 5, 6, B+
DEIVER
CHECK THE C934
VOLTAGE 55V
CHECK D919
CHECK Q911
Q911 FAILURE
CHECK Q912, Q914, Q915
CHECK Q901
IC901 FAILURE
