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Akai GX-77 Service Manual

Akai GX-77
66 pages
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Page #25 background imageLoading...
Page #25 background image
(cl
(Mi-com}
|
®,
\
|
it
|
©!
-
0
T
reel
Wit
@9
vo
@)
01
@2
02
©o3
@oe
@os
(@)
06
©o-
0O-
0
-0-
0-0-0
-
.
=
fy
uy
i;
LED
cames
on
when
the
pulse
is
of
"H"
level
®
‘
ee
ee
<—Orsploy
of
the
4tn
(leftmost)
digit
0
|
t
1
©
Se
ee
ee
<—Disploy
of
the
3rd
digit
)
~<e—Disploy
of
the
2nd
digit
|
!
t
mM
J
[
]
v1
<—
Display
of
the
ist
(rightmost)
digit
°
|
~=<—The
pulse
for
turning
on
each
tunction
mode
indicotor
~<—Segment
o
and
PAUSE
IND
<—Segment
band
REC
IND
“—Segment
c
and
FWO
IND
<—Segment
d
and
REV
IND
~<—Segment
e
<—Segment
t
~<—
Segment
g
Oisploy
of
the
ist
(rigntmost)
digit
Display
of
the
2nd
digit
Display
of
tne
3ra
aigit
Disploy
of
the
4th
(leftmost)
digit
Activation
of
each
function
mode
indicator
Also
the
function
mode
indicators
are
lighted
up
by
the
operation
timing
of
the
control
signal
from
the
microcomputer.
Here,
we
take
the
example
of
FWD
PLAY/PAUSE
in
Fig.
29.
FWD
PLAY
shall
be
called
simply
as
PLAY
hereinafter.
In
PLAY/
PAUSE
mode,
the
function
mode
indicator,
PAUSE
is
always
lighted
and
PLAY
is
flashing.
Firstly
look
at
the
longitudinal
raw
of
the
function
mode
indicators
of
DO
~
D3
in
Fig.
29.
You
will
see
that
PAUSE
IND
is
“H”
level,
PLAY
IND
is
“L/H”
flashing
and
others
are
“L”
level.
(DO
~
D3)
and
IC1
©
signals
are
inputted
into
the
latch
circuits
of
@,
@,
@,
@
and
©
of
Fig.
29
IC2
in
Fig.
27.
The
latch
circuit
is
shown
in
Fig.
28,
and
in
such
case,
since
IC2
©)
polarity
is
always
“H”’,
data
is
always
“H”,
data
is
outputted
when
the
clock
is
*“*H”’,
and
when
it
is
“‘L’’,
the
data
latched
and
held
is
outputted.
Therefore,
in
FWD
PLAY/PAUSE,
when
the
clock
signal
of
IC1
@
is
“H”,
the
PAUSE
indicator
is
“H”
and
FWD
IND
is
“L/H”’
flashing,
and
“H”
signal
appears
in
IC2
@)
in
Fig.
27
to
turn
TR13
ON
and
flashes
PAUSE
IND,
and
in
IC2
@),
“L/H”
flashing
signal
appears
to
turn
TRI1
ON
and
OFF
and
flashes
FWD
IND.
25

Table of Contents

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Akai GX-77 Specifications

General IconGeneral
Track System4-track, 2-channel stereo
Tape Speed3 3/4 ips, 7 1/2 ips
Wow and Flutter0.03% (19 cm/s)
Heads3
Motors3
Dimensions440 x 244 x 358mm
InputsLine input (RCA)
OutputsLine, Headphones

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