E-17
TROUBLESHOOTING GUIDE
YES
YES
YES
No E-E (no video and audio
from tuner)
NO
NO
NO
Whether TU601 7th pin
is 5V or not, whether is
9th pin 30V or not?
Investigate a power supply
circuit.
Investigate 5V and 9V lines.
Investigate a line of IC4001
38th pin with IC604 56th pin.
Whether is IC604 6 and
28th pin 5V or not?
Whether there is a
video signal for IC4001
38th pin or not?
YES
NO
Whether there is Y signal
for C signal 52nd pin for
IC604 54th pin or not?
Investigate a line of IC604 54,
52nd pin with CP604 4, 5th pin.
Exchange IC604.