Akai GX-77 Service Manual

FWD KEY ,ON"
STOP (LOADED)
SW-904 ON
(TENSION )
Sw-905 ON
(LOADER )
a
eee
PAUSE
STOP
(FWD
LED
FLASH)
+10V
ic1@®
(REEL MOTOR R) i
I +i0V
Ic
I
G9)
0.4
sec
|
59
foe
+5V
REEL
MOTOR
R
{St
! |
I +10V
1c
1
38)
(FWD)
+tOvi
|
Ic 1 G4) MUTE ON
(P.B MUTE)
L
1c 1 (3)
(REEL MOTOR L)
4) FWD Mode After Loading (Tape Loaded)
(Refer to Fig. 10)
If FWD key is turned ON after loading, @ will
be “H”, @ “H” (for 0.4 sec.), and +36V is
applied to FWD PLG, and TR31, TR32 “ON”, and
after 0.4 sec., the voltage will be changed to +14V
(because of TR38 OFF).
Beause of TR22, 23 “ON”, the original +5V on
the
right
reel
motor
will
be
changed
to
+2.7V
(due to power regulation).
The
left
reel
motor
has
OV
(only
mechanical
tension
is
operated)
and
@)
will
be
changed
fron
“H”
to
“L”,
and
the
pre
amplifier
MUTE
is
rdeased.
i
I
1
I
|
T
I
|
Fig. 10
5) STOP + FWD > REV > PAUSE Mode
(Refer to Fig. 11)
For FWD to REV, @ (QT relay) becomes ‘“H”
for
0.4
sec.,
TR37
“OFF”
and
TR38
“ON”,
and
+36V is applied to each plunger.
After
0.4
sec.,
TR38
becomes
“OFF”,
and
+14V
is
applied
to
each
plunger.
For
each
reel
motor,
the
first
+5V
and
then
reduced
to
+2.7V
in
FWD
and
REV
mode.
a
ns
eee

Akai GX-77 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	3 3/4 ips, 7 1/2 ips
Wow and Flutter	0.03% (19 cm/s)
Heads	3
Motors	3
Dimensions	440 x 244 x 358mm
Inputs	Line input (RCA)
Outputs	Line, Headphones