TROUBLESHOOTING GUIDE
D-7
SCREEN SIZE DOESN'T CHANGE
Check 21pin cable and
connection.
Do screen size at 4:3, and play
the disk which supported,
Is there voltage at pin 8
of 21pin about 10V(No load)?
Yes
No
Check IC4001 and
peripheral circuit.
No
Yes
Is the voltage at pin 200
of IC4001 about 3.3V?
Check Q8001, Q8002, Q8003
and peripheral circuit.
THE OUTPUT OF 21PIN DOESN'T
CHANGE(COMPOSITE - RGB)
Check 21pin cable and
connection.
When 21pin output is RGB,
Is there voltage at pin
16 of 21pin about 4.5V
(No load)?
Yes
No
Check IC4001 and
peripheral circuit.
No
Yes
Is the voltage at pin 197
of IC4001 about 3.3V?
Check Q8004, Q8005
and peripheral circuit.
