E-14
TROUBLESHOOTING GUIDE
YES
NO
YES
NO
NO
YES
NO
YES
YES
A audio can't record it
A bias level with L4003
is OK (approximately
40Vp-p)
Investigate Q4005 and
Q4006 peripheral circuit.
Whether there is an
audio signal for IC4001
76th pin or not?
Investigate a circuit to IC4001
76th pin with IC5501 61st pin.
Whether there is an
audio signal for IC4001
96th pin or not?
Investigate IC4001 and the
peripheral circuit.
Whether there is a
signal for IC4001
98th pin or not?
Investigate IC4001 and the
peripheral circuit.
NO
Whether there is a
signal for IC4001
7th pin or not?
Exchange IC4001.
Investigate a lead line and
connector of A/C head.
