Akai GX-77 Service Manual

Adjustment
Item
Test Tape
Supply Signal
FWD
Playback
|
700
Hz
7-1/2
ips
level
0
VU
Test
Tape
700
Hz
7-1/2
ips
0
VU
Test
Tape
Pace a wal
a wal
Bias
OSC
ad
level
REV
Recording
level
NORMAL
Position FWD
Frequency
Response
NORMAL
Position REV
Frequency
Response
EE Position
Frequency
Response
(3-3/4 ips)
EE Position
Frequency
Response
(7-1/2 ips)
FWD
Distortion
Confirmation
REV
Distortion
Confirmation
“Bar Meter
Sensitivity
Tape 1,000 Hz
0 dBm Recording
NORMAL Blank
Tape 1,000 Hz
0 dBm Recording
NORMAL Blank
Tape 1.5kHz, | F
15 kHz —20 dBm
RE
RE
RE
RE
REV,
RE
RE
Recording
RE
RE
RE
RE
NORMAL Blank
NORMAL Blank
Tape 1.5 kHz, | RE
15 kHz —20 dBm a
Recording
EE Blank Tape FWD
2.0 kHz, 20 kHz REV/
—20 dBm
Recording
EE Blank Tape F
RE
2.0 kHz, 20 kHz
-20 dBm
Recording
1,000 Hz 0 dBm | F
Recording
V
Cc
Cc
/
Cc
/
Cc
WD/
Cc
V/
Cc
Cc
WD,
V/
Cc
WD/
C
Vv
REC
1,000 Hz 0 dBm | REV/
Recording
1,000 Hz 0 dBm
STOP
from an
oscillator
oe .- - 4
ak (0.775V)
VR9 0+0.5 dBm
50K (0.775V)
—
See NOTE 6.
indication
Set TAPE SELECTOR to
“EE”, Tape Speed 7-1/2 ips.
Connect a Frequency Counter
between TP and GND.
Fig. 40.
Set TAPE SELECTOR to
“NORMAL”.
Tape Speed 3-3/4 ips.
Connect a AC voltmeter
between TP and GND.
Fig. 40.
Tape Speed 3-3/4 ips.
Recheck Recording level.
Tape Speed 3-3/4 ips.
Recheck Recording lerel.
Tape Speed 3-3/4 ips.
Recheck Recording level.
Tape Speed 7-1/2 ips.
Recheck Recording level.
Less than 0.5%
Less than 0.5%
Less than 0.5%
Less than 0.5%
Set MONITOR Switch to
“SOURCE”.
See NOTE 7.
33

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