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