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5. Audio Output
The internal audio signal from pin 51 of IC201 is supplied to pin 1 of ICOO1, audio output
-
LA4285, for AC1 -A and AC1 -C, LA4287 for AC1 -B. The external audio signal is supplied to pin
3 of ICOO1. Either of audio signals is selected by the Internal/External
switching signal input
to pin 4.
The selected audio signal passes through the pre-amplifier circuit and the drive circuit into the
audio amplifier. The sound volume control is supplied from pin 39 of the CPU to pin 5 of ICOO1
through the digital-analogue
converter circuit. The audio amplifier is the SEPP(Single
Ended
Push Pull) type and the output from pin 9 drives the speaker directly.
IC201
lF/VIDEO/CHROMA
b'
Q184
, ...........................
8
:
SOUND
!
;
FILTERING
:
E CIRCUIT
:
. ........... .............
SIF Carrier
1
3
(n
F
z
w
2
y
1-
3
~
g
I
I
HEADPHONE
\ I
\ (
v
51
INT.AUDIO
>
1+
4
5
9
SPEAKER
>
3-0
J
Icool
AUDIO OUTPUT
EXT.AUDIO-IN
-
-24-
Training
Manual
AC1 Chassis
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