Akai 4000DS Mk-II Service Manual

I. SPECIFICATIONS
An asterisk next to a figure indicates the minimum guaranteed performance.
TRACK SYSTEM
REEL CAPACITY
TAPE SPEED
WOW AND FLUTTER
FREQUENCY RESPONSE
AKA! SRT tape
Regular tape
SIGNAL TO NOISE RATIO
DISTORTION
CROSS TALK
ERASE RATIO
INPUTS
OUTPUTS
Mic input
Line input
Din input
Line output
Din output
BIAS FREQUENCY _
BIAS LEAK
HIGH FREQUENCY DEVIATION
RECORDING CAPACITY _
FAST FORWARD AND REWIND TIME
HEADS
Recording Head
Playback Head
Erase Head
TRANSISTORS
DIODES
POWER SUPPLY
POWER CONSUMPTION
INSULATION RESISTANCE
INSULATION DURABILITY
DIMENSIONS
WEIGHT
4-track 2-channcI stereo/monaural system _
Up to 7" reel _
7-1/2 and 3-3/4 ips ± 2% (*±3%)
Less than 0.15% (•0.22%) RMS at 7-1/2 ips
Less than 0.20% (*0.30%) RMS at 3-3/4 ips
30 to 23,000 Hz (M0 to 22,000 Hz) ± 3 dB at 7-1/2 ips
30 to 16,000 Hz (M0 to 14,000 Hz) ± 3 dB at 3-3/4 ips
30 to 20,000 Hz (M0 to 20.000 Hz) ± 3 dB at 7-1/2 ips
30 to 14,000 Hz (M0 to 14.000 Hz) ± 3 dB at 3-3/4 ips
Better than 50 dB at 7-1/2 ips
Better than 48 dB at 3-3/4 ips
Less than 1.5% (*2.0%) at 7-1/2 ips
Less than 2.5% at 3-3/4 ips
Better than 70 dB (*60 dB) monaural
Better than 50 dB (M5 dB) stereo_
Better than 70 dB
0.8 mV Impedance 5 kft
70 mV Impedance 150 kft
7 mV
1.228V (4 ± 1 dB) using a 250 Hz “O’* VU recorded tape
0.4V
105 kHz ±5% _
Less than -30 VU _ *
Within 2 dB using an 8,000 Hz 3-3/4 ips recorded tape at 7-1/2 ips
60 min. stereo recording using a 1,200 ft. tape at 7-1/2 ips_
15 2/190 sec. using a 1,200 ft. tape at 60/50 Hz
4-pole induction I-speed motor
Type: SSM-1
Revolutions: 1,800/1,500 rpm. at 60/50 Hz _
In-line 4-track 2-channcl recording head
Type: P4-I54
Gap: 1 micron
Impedance: 9512 ± 15% at 1,000 Hz
In-line 4 track 2-clianncl playback head
Type: P4-I50
Gap: I micron
Impedance: 1,250ft ±15% at 1,000 Hz
In-line 4-track 2-channcl erase head
Type: E4-200
Gup: 0.6 mm
Impedance: 200ft ±5% at 100 kHz _
6.2SC458 LG (C) <D) 2.2SC97I (2;
2. 2 SC87I (K) (! ■ *) _ 1 . 2 SCHW
4_ LD3I4I ___
2. IN34A
I. I OIK-I
1. IS339A
100 to 240V A.(\. 50/60 Hz
120V A60 Hz lor CSA/UL Models
220V A.C.. 50 Hz lor CEE model
35 W
More Ilian 50 MA _ _
I, 000V A.C. for more than I min. duration
406 <W) X 314 (11) X 194 (D) mm__ (15.9" X 1 2.4" X 7.6")
II. 4 kg (25 lbs.)
2SC971 (2) (3) (red)
2SC1098 (L) (M)
NOTE: Specifications subject to change without notice.

Akai 4000DS Mk-II Specifications

General

Type	Reel to Reel
Track System	4-track, 2-channel, stereo/monaural system
Signal to Noise Ratio	50dB
Reel Size	Up to 7 inch reel
Total Harmonic Distortion	1.5%
Output	0.775V (line)
Tape Speed	3.75 & 7.5 ips
Heads	1 x erase
Input Sensitivity	50mV (line)
Semiconductors	6 x Transistors
Inputs	Line
Outputs	Line