b)
If the REC operating test, the
XtlOh' operating test and the REM operating test are
all normal and WRITE or REAL) to the audio cassette is abnormal, the cause is
listed below.
*
Cassette bus connector is bad.
*
U43. U41. U43, or U27. of serial interface circuit are bad. and U26 is bad.
6.3.8
Abnormal
110
Port
*
See ltem 5.2.8 "I/O Port Operation Test"
If you can verify following abnormalities,
exchangc the CPU board.
a) OUT
901-1 is abnormal
If the output signal at U36 (P9) is abnormal, U36 or U33 are bad.
b) OUT AIH is abnormal
If the output signal at U53
(PI) is abnormal, U33, UI I, or U53 are bad.
C) IN AOH is abnormal
If
the output signal at U1
1
(P2) is abnormal, U11 or U33 are bad.
d) OUT
B9H
is abnormal
If the output signal at U
18
(P2
1)
is abnormal. U 18 is bad.
e) OUT
BAH
is abnormal
If the output signal at U 18 (P3
1)
is abnormal, U18 is bad.
f)
IN
BBH
is abnormal
If the output signal at
U
18
(P37)
is abnormal,
U20
is bad.
g) OUT C8H is abnormal
If
the
output signal at U21 (PI?) is abnormal, U21 is bad.
h) IN
C8H
is abnormal
If the output signal at U
19
(P 10) is abnormal, U3
1
is bad.
i) OUT D8H is abnornlal
If the output signal at U21 (1'1
2)
is abnormal, U21 is bad.
j)
IN
D8H
is abnormal
If the output signal at
U19
(P6) is abnormal, U19 is bad.
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