Akai GX-630D Service Manual

| SPECIFICATIONS
An asterisk next to a figure indicates the minimum guaranteed performance.
TRACK SYSTEM
4 track 2 channel stereo/monaural system
TEPE SPEED
T-1/2and 3-3/4 ips 20.7%
*7.1/2 and 3-3/4 ips +1.0/—1.5%
WOW AND FLUTTER
Less than 0.06% WRMS at 7-1/2 ips
Less than 0.09% WRMS at 3-3/4 ips
*Less than 0.10% RMS at 7-1/2 ips
*Less than 0.15% RMS at 3-3/4 ips
TOTAL WOW AND FLUTTER
*Less than 0.12% RMS at 7-1/2 ips
*Less than 0.18% RMS at 3-3/4 ips
FREQUENCY RESPONSE
30 to 25,000 Hz +3 dB at 7-1/2 ips
30 to 19,000 Hz +3 dB at 3-3/4 ips
(with AKAI LN-150-7 Tape)
|_*30 to 22,000 Hz +3 dB at 7-1/2 ips
In *30 to 18,000 Hz +3 dB at 3-3/4 ips
HARMONIC DISTORTION
Less than 0.5%
TOTAL HARMONIC DISTORTION
zi *Less than 1.5%
SIGNAL TO NOISF RATIO
Better than 50 dB
TOTAL SIGNAL TO NOISE RATIO *Better than 47 dB
| *0.775V (0 dBm +10 dB)
30 mV at 8 ohm
At playback of a 700 Hz “0” VU pre-recorded test tape.
|_(Output Volume at maximum)
OUTPUT LINE
HEADPHONE
INPUT MIC
LINE
DIN INPUT/OUTPUT
RECORDING/PLAYBACK LEVEL
CROSS TALK
ERASE RATIO
RECORDING BIAS FREQUENCY
BIAS LEAK «
HIGH FREQUENCY DEVIATION
More than 0.25 mV/10 k ohm
More than 70 mV/150 k ohm
At “0” VU output. (Recording Volume at maximum)
0.25 mV/0.5V
*0.775V (O dBm +1.5 dB)
Better than 45 dB, stereo
Better than 55 dB, monaural
dez
RECORDING TIME
Better than 70 dB
100 kHz +5%
Better than —30 dB (GX-630D)
Better than —50 dB (GX-630DB)
Within 3 dB
At playback of an 8,000 Hz 3-3/4 ips pre-recorded tape at 7-1/2 ips
180 min stereo recording at 7-1/2 ips, using a 3,600 ft tape.
F.FWD AND RWD TIME
Approximately 2 min and 40 sec at 50 Hz, using a 3,600 ft tape.
MOTOR
MAIN MOTOR
REEL MOTOR
2 speed AC servo control outer rotor motor
Type: SCM2-24KJ 4 pole
Revolutions: 615 rpm at 7-1/2 ips (19 cm/sec)
307.5 rpm at 3-3/4 ips (9.5 cm/sec)
6 pole eddy current outer-rotor motor
{_ Type: 24XO-TD
Revolutions: 930 rpm at 50 Hz
1,120 rpm at 60 Hz
HEAD
ERASE HEAD
RECORDING HEAD
PLAYBACK HEAD
Type: E4-260
Gap: double gap
Impedance: 210 ohm +10% at 100 kHz
D.C Resistance: 2 ohm
Type: R4-200
Gap: 4 micron
Impedance: 1,870 ohm at 100 kHz
‚_D.C Resistance: 8 ohm
__ Type: P4-202
‚Gap: 1.7 20.5 micron
£__Impedance: 1,400 ohm at 1 kHz
D.C Resistance: 268 ohm

Akai GX-630D Specifications

General

Track System	4-track, 2-channel, stereo/monaural system
Reel Size	up to 10.5 inch reel
Wow and Flutter	0.06% (7 1⁄2 ips)
Signal to Noise Ratio	58dB
Output	0.775V
Type	Reel-to-reel tape deck
Heads	3 (erase, record, playback)
Motor	2 x reel, 1 x capstan
Tape Speeds	3 3⁄4 ips, 7 1⁄2 ips