Akai GX-215D Service Manual

INGE
No. 1
PRELIMINARY
SERVICE
MANUAL
moveL GX-2l9D
e
DATE January 1977
Technical Data
Track System
- Reel Capacity
Tape- Speed
Wow & Flutter
Frequency Response
Distortion
Signal-to-Noise Ratio
Erase Ratio
Bias Frequency
Heads
Motors
FF and Rewind Time
Output Jacks
Input Jacks
DIN Jack
Semi-conductors
Power Requirements
Dimensions
Weight
4
track
2
channel
stereo/monaural
system
Up
to
7"
reel
7-1/2
and
3-3/4
ips
Less
than
0.09%
RMS,
0.17%
(DIN
45
500)
at
7-1/2
ips
Less
than
0.18%
RMS
at
3-3/4
ips
30
to
25,000
Hz
*3
dB
at
7-1/2
ips
30
to
19,000
Hz
*3
dB
at
3-3/4
ips
Less
than
1%
(1,000
Hz
"0"
VU)
Better
than
56
dB(measured
via
tape
with
peak
recording
level
of
+6
VU)
Better
than
70
dB
100
kHz
(3):
One
GX
playback,
one
GX
recording
and
one
erase
head
(3):
One
4/8
pole
self
lubricating
hysteresis
synchronous
capstan
drive
motor
and
two
eddy
current
outer-rotor
reel
drive
motors
90
sec
using
1,200
ft
tape
Line(2):
0.775V(O
VU).
Required
load
impedance:
more
than
100
k
ohms
Phone(1):
50
mV/8
ohms
Microphone(2):
0.3
mV/2.2
k
ohms.
Required
microphone
impedance:
600
ohms
Line(2):
70
mV/100
k
ohms
Input
0.3
mV/Output
0.5V
Transistors
27,
Diodes
17
CSA,
UL
and
LA
Models:
120V,
60
Hz
only
CEE
Models
:
220V,
50
Hz
only
Other
Models:
110/120/220/240V,
50/60
Hz
switchable
380(W)
x
390
(H)
x
295(D)
mm,
(15.0"
x
15.4"
x
11.6")
15.7
kg
(34.6
lbs)
NOTE:
For
improvement
purposes,
specifications
and
design
are
subject
to
change
without notice.
i
i
a
Ne
en
AKAI
ELECTRIC
CO.,
LTD.
(P.0.BOX 21, Tokyo International Airport, Japa )
12-14,
2-chome,
HigashiKojiya,
Ohta-ku,
Tokyo,
Japan
Printed in Japan

Akai GX-215D Specifications

General

Brand	Akai
Model	GX-215D
Category	Tape Deck
Language	English

Summary

Principal Parts Location

Mechanism Adjustment

Reel Table Height Adjustment

Adjust reel table height to ensure tape winds centered on the reel.

Brake Tension Adjustment

Adjust brake band tension by modifying spring and metal positions.

Reel Motor Tension Settings

Specifies reel motor tension for FWD, PB, F.FWD, and RWD modes.

Flywheel Loose Play Adjustment

Adjust flywheel by setting a 0.3mm gap between steel ball and bearing.

Flywheel Belt Position Adjustment

Adjust flywheel belt position to center it on the motor pulley.

Shifter Lever Adjustment

Adjust shifter lever to set a 2-3mm gap between lever and angle plate.

Head Adjustment Procedures

Erase Head Height Adjustment

Adjust erase head height to align its upper edge with the tape's upper edge.

Recording Head Height Adjustment

Adjust recording head height to match the tape's upper edge.

Playback Head Height Adjustment (FWD)

Adjust FWD playback head height to match the tape's upper edge.

Playback Head Height Adjustment (REV)

Adjust REV playback head height to match the tape's lower edge.

Playback Head Azimuth Alignment

Align playback head azimuth for maximum output in both channels.

Playback Head Gap Alignment

Align playback head gap surface for consistent output with tape tension.

Recording Head Azimuth Alignment

Align recording head azimuth using a specific test tape and frequency.

Recording Head Gap Alignment

Align recording head gap using a specific test tape and frequency.

Amplifier Adjustment and Calibration

Playback Level Adjustment

Adjust playback level to match reference signal at specified tape speed.

VU Meter Sensitivity Adjustment

Calibrate VU meter sensitivity using a reference signal.

Recording Level Adjustment

Adjust recording level for tape and source signals.

Frequency Response Adjustment

Adjust for correct frequency response using specified test tapes.

Bias Leak Measurement

Measure bias leak to ensure it is below the specified limit.