21
6-10 POWER SUPPLY TROUBLE SHOOTING CHART
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A)
VARIABLE OUTPUT : 60.5V - 145V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B)
CONSTANT OUTPUT : 6.3V, 14.5V, 55V, 80V
BEAD SET
ABNORMAL VARIABLE OUTPUT
NG
OK
NG
OK
NG
OK
NG
NG
NG
OK
OK
OK
NG
OK
NG
YES
NO
CHECK BRIDGE
RECTIFIED CIRCUIT
6.3V CIRCUIT
CHECK START C.K.T
CHECK POWER SAVING
C.K.T(OFF-MODE)
CHECK IC401
CHECK D919
CHECK Q911
Q911 FAILURE
CHECK Q901
CHECK IC901
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901, SW901
CHECK LINE RECTIFIED
& SMOOTHED VOLT
CHECK Q901
IC901 FAILURE
CHECK T901 O/P
MAKE SURE THAT
THE VARIABLE
OK
D909, Q904, R922, R925
CHECK Q912, Q914, Q915
PIN 4, 5, 6, B+ DRIVER
OUTPUT IS NOT SHORTED
VOLTAGE 55V
CHECK THE C934
CHECK 80V, 55V, 14.5V
R923,R924
50V
CHECK START
C.K.T R925, R944
CHECK THE C934
VOLTAGE 47V
CHECK IC401
PIN 11,12,13,14
B+ DRIVER
Summary of Contents for EX951F
Page 23: ...22 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...
Page 46: ...45 9 IC BLOCK DIAGRAM IC101 NT68F65U IC102 24C08 IC901 STR G9656D ...
Page 47: ...46 IC401 UPC1888ECT ...
Page 48: ...47 IC804 NT6828 00046 IC801 LM 1269NA ...
Page 49: ...48 IC803 LM2480NA IC904 PC431CLP IC903 L7812CV ...