TROUBLESHOOTING GUIDE
No
Are the Brightness and
Contrast set to normal ?
Yes
No
Is the voltage at pin 28
of IC604 DC5.1V ?
Yes
Is the signal at pin 30
of IC604 output ?
No
No
Is the waveform at pin 47
of IC604 normal ?
Yes
Check IC604.
No
Yes
Is the signal at
Base of Q406 ?
No
Yes
Is the signal at pin 1
of CP401 ?
No
Yes
Do pins 17, 18 and 19
of IC604 feed signal ?
Check peripheral circuit of
CRT PCB.
Adjust Brightness and Contrast.
Check P.CON +9V line.
Check X604.
Check peripheral circuit of T401
and Q405.
Check peripheral circuit of Q406.
Check IC604.
Yes
NO PICTURE
E-3
