Akai GX-635D Service Manual

Terminal
Name
Terminal
Function
Operation
input
terminals
STOP
lnput terminal
for
stopping
operation
FF
Input terminal
for fast
forward
RWD
Input terminal
for rewind
FWD
Input
terminal
for
playback in the
forward direction
REV
Input terminal
for
playback in
the reverse
direction
REC-
Input
terminal for recording
Control
input
terminal AR
Input terminal
for
preventing recording
Output
terminals
FAST
Terminal
with
"H"
signal
output
during
fast
forward or rewind
mode
FF
Terminal
with
"H"
signal
output during
fast forward mode
F}VD
Terminal
with
"H"
signal
output
during
forward
playback
mode
REV
Terminal
with
"H"
signal
output
during
reverse
playback mode
REC
Terminal
with
"H"
signal
output
during
recording
or
REC/Pause mode
2)
Terminals
and
their
functions
3)
Operation
activated
by each
input
NOTES:
1. The
input signal
is activated
by
the
fall
of
_]-f
.
2. The
output
is maintained
until
the next
input signal.
3. AR
is a
control
input terminal
and
the REC
output
is not
"H"
when
AR
4.
When
AR
=
"L"
signal
is supplied
during
the
REC output
is
"H",
REC
output
becomes
"L".
5. At the
moment
the
power
is on,
all output
will be
"L"
and
the Stop
mode
will be
effected.
4)
Regarding
the input
circuit's diode
Dl3
Previously
M54410P
has
been so
designed
that
the
first terminal
was
FLAY input
and
the sixth
terminal
was
PAUSE
input. But
in
GX-635D,
pLly
is used
for REV
and
PAUSE
for FWD.
Consequently,
gÍounding
only
the
6th terminal
(FWD)
will
not allow
the modes
to be
changed
Chart-2
Chart-3
directly
from
FF or RWD
to
FWD.
For this
reason,
the first
terminal
(ngVt
is
also
grounded
through
diode
Dl3
releasing
FF
and
RWD.
In
addition,
even
if there
are simultaneous
inputs
into
both
F\tD and
REV,
FWD
mode
output
is
designed
to take
prioritY.
lnpul
Signal
Output
Output
Mode
FAST
FF
FWD
REV
REC
STOF
L
L
L
L
L
STOP
Mode
FF
H
H
L
L
L
FF Mode
RWD
H
L
L
L
L
RWD
Mode
FWD
L
L
H
L
L
FWD
Mode
REV
L
L
L
H
L
REV
Mode
REC/FWD
L
L
H
L
H
REC/FWD
Mode
REE/REV
L
L
L
H
H
REC/REV
Mode
t9

Akai GX-635D Specifications

General

Track system	4-track, 2-channel stereo
Total Harmonic Distortion	0.8%
Outputs	0.775V (line)
Type	Reel to Reel
Heads	3 heads
Motor	2 x reel, 1 x capstan
Reel size	up to 10.5 inch reel
Wow and flutter	0.06% (7 1⁄2 ips)
Frequency response	30Hz to 26kHz (7 1/2 ips)
Signal to Noise Ratio	62dB
Dimensions	440 x 440 x 240 mm (17.3 x 17.3 x 9.4 inches)
Output Voltage	0.775V
Tape speeds	3 3/4 ips, 7 1/2 ips