E-6
TROUBLESHOOTING GUIDE
NO
YES
NO
YES
NO
NO
YES
NO
An only horizontal line appears
Investigate C429 and D411
Investigate CRT, IC401 and a
peripheral circuit.
Whether does a vertical
signal appear for IC604
26th pin or not?
Investigate IC604.
Screen display doesn't appear
The wave form of the 62nd
pin, the 63rd pin, the 64th
pin, and also the 60th pin
of IC1001 normal?
The wave form of the 58th pin,
the 59th pin, and also the 56th
pin of IC1001 is investigated.
Q1016 and also Q1015 are
investigated.
The wave form of the 17th
pin, 18th pin and 19th pin
of IC604 normal?
Investigate the circuit of IC604
from IC1001.
Is the voltage DC 25V for
IC401 6th pin or not?
Is the voltage DC 14V for
IC401 2nd pin or not?
