ViewSonic P95f+-1 Service Manual page 23

6-9 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) CONSTANT OUT PUT: 6.5V, 16V, 80V, 180 V, -10V
BEAD SET
CHECK AC LINE
VOLT 120V OR 220V
NG
OK
CHECK LINE RECTIFIED
& SMOOTHED VOLT
NG
OK
CHECK START C.K.T
CHECK START C.K.T ZD902,
Q904, D909, R908
D909, Q904, R922, R925
NG
OK
CHECK T901 O/P
NG
OK
CHECK IC901
NG
OK
CHECK Q901
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CHECK F901, SW901
CHECK BRIDGE
RECTIFIED CIRCUIT
CHECK POWER SAVING
C.K.T(OFF-MODE)
NG
CHECK 80V, 55V, 14.5V
CHECK 180V, 80V,
16V, 6.5V CIRCUIT
6.3V CIRCUIT
IC901 FAILURE
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
YES
CHECK THE C934
VOLTAGE 55V
OK
CHECK Q911
OK
CHECK Q912, Q914, Q915
CHECK Q901
20
Confidential – Do Not Copy
NO
CHECK IC401
PIN 4, 5, 6, B+ DRIVER
NG
CHECK D919
NG
Q911 FAILURE
OK
P95f+/B-1