Power Supply Trouble Shooting Chart - Fujitsu MCM1514V D556Q 154V/C551 Service Manual

4V SERIES MANUAL
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
D909,Q904,R922
OK
CHECK T901 O/P
NG
OK
CHECK IC901
NG
OK
All manuals and user guides at all-guides.com

6-9 POWER SUPPLY TROUBLE SHOOTING CHART

VARIABLE OUTPUT : 90V - 160V
(DEPENDING UPON H.SYNC FREQUENCY)
(B) CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V
ABNORMAL VARIABLE OUTPUT
NO
CHECK F901,SW901
YES
NG
CHECK BRIDGE
OK
RECTIFIED CIRCUIT
CHECK 75V,- 12V,
15V, 6.3V CIRCUIT
NG
IC901 FAILURE
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
CHECK IC401
H-OSC SEE ITEM 1
CHECK 75V LINE
CHECK D919
CHECK Q911
NG
Q911 FAILURE
OK
OK
CHECK Q901
CHECK Q901
Page 21 of 5
CH
(IT