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6-4 HOR./OSC/DEF/HV CIRCUIT FAULT
NO RASTER (DISCONNECT WITH SIGNAL CABLE)
NG
OK
NG
OK
NG
OK
NG
6-5 ABNORMAL HORIZONTAL DEFLECTION
1. ABNORMAL HORIZONTAL SIZE
NG
OK
2. ABNORMAL HORIZONTAL RASTER CENTER
CHECK D418,D419,R457,R458,L404
CHECK IC401 PIN 29 ABOUT 11.5VDC
CHECK IC401 PIN 29 RELATIVE
CIRCUIT
CHECK IC401 PIN 4 ~ 7, PIN 13
RELATIVE CIRCUIT
CHECK IC401 PIN 26 WAVE
FROM ABOUT 3Vpp
CHECK Q402,T401
RELATIVE CIRCUIT
CHECK THE COLLECTOR VOLTAGE OF
Q402 ABOUT 30Vpp
FROM ABOUT 3Vpp
CHECK THE COLLECTOR VOLTAGE OF
Q403 ABOUT 1250Vpp AT FH:31KHz
FROM ABOUT 3Vpp
CHECK T401,T402,Q402,Q403,
D408,C418,C419,H-DY,B+
FROM ABOUT 3Vpp
CHECK THE RELATIVE CIRCUIT
OF Q404,Q405, & Q406
READJUST H
-
SIZE FUNCTION
CHECK FBT VOLTAGE ABOUT
90V AT FH=31KHz
CHECK THE HV OF CRT
ABOUT 24.5KV
CHECK THE RELATIVE
CIRCUIT OF SMPS.
Page
18
of
59
4V SERIES MANUAL
05.06.2002
file://D:\PC%20AOC\SERVICE%20MANUAL\FSC\154V\154V
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C551.htm