Akai GX-4000D Service Manual

IV.
PRINCIPAL
PARTS
LOCATION
V. MECHANISM ADJUSTMENT
TENTION SWITCH
Sw902
PAUSE LEVER
3 " : 9 th START SUTTON
TRACK
SELECTOR
;
:
7
ats
y
swi
:
or
ae
POWER SWITCH
Swi
MEADPHON
: :
ao
By
:
HEADPHONE
VACK
eS
Pe
:
a
H
a
me
&
é
Le,
a
oe
4
ma
MACK
Bree
Fig. 4 Pinch Roller Pressure Measurement
MONITOR Sw -1
OUTPUT VRO $08 $w4.2
—_—
MIS REC LEVEL VR? 1
INE REC LEVEL vee
£9 Sw4-3 Lo rape SELECTOR Swa-4
Fig. 2 Front View (GX-4000D)
1. PINCH ROLLER PRESSURE
MEASUREMENT (Refer to Fig. 4)
!
Set the
recorder
in
the
PLAY
Mode.
Pull
the
pinch
‘
roller
1~2
mm
away
from
the
capstan
with
the
spring
¢90!
3
gauge
as
shown
in
Fig.
4.
Slowly
release
and
take
the
spring
gauge
reading
when
the
pinch
roller
touches
the
capstan
and
begins
to
rotate.
The
specified
pinch
roller
pressure
is
1
150~1
200g.
(Tape
speed:
7-1/2
ips)
POWER TRINSFORMER
Te0r tee gee MoroR M901
2. REEL TABLE BLOCK ADJUSTMENT
(Refer to Figs. 5, 6)
* Necessary points when measuring the tension
Wind the tape onto a 5” empty reel until there is a
diameter of 60 mm of tape. (See Fig. 5). Make the
end of the tape into a loop and put onto the spring
gauge.
: * Lug
E gh cult ddieo ee oe RINE_QUTPUT. JACKS LINE INPUT JACKS
DIN JACK
Fig. 3 Rear View (GX-000D) |
i
A.
SUPPLY
REEL
TABLE
BLOCK
ADJUSTMENT
1) RWD Tension Adjustment
A spring gauge reading of 400~500g in the
RWD Mode.
To adjust, increase or decrease the number of
(1) washers.
2) PLAY Mode Back Tension Adjustment
A
spring
gauge
reading
of
100~120g
in
PLAY
Mode.
To
adjust,
increase
or
decrease
the
number
of
(2) washers.
3) FF Free Tension Adjustment
A
spring
gauge
reading
of
15~20g
in
the
FF
Mode.
To
adjust.
move
the
position
of
puiley
(3)
back-
wards and forwards.
B.
TAKE-UP
REEL
TABLE
BLOCK
ADJUSTMENT
1) FF Tension Adjustment
A
spring
gauge
reading
of
400~500g
in
the
FF
Mode.
To
adjust.
increase
or
decrease
the
number
of
(1) washers.
2) PLAY Tension Adjustment
A spring gauge reading of 150~180g in the
PLAY Mode.
To
adjust,
increase
or
decrease
the
number
of
(2) washers.
3) RWD Free Tension Adjustment
A
spring
gauge
reading
of
15~20g
in
the
RWD
Mode.
To adjust. move the position of pulley (3) back-
wards and forwards.

Akai GX-4000D Specifications

General

Track System	4-track, 2-channel, stereo/monaural system
Reel Size	Up to 7 inch reel
Tape Speeds	3 3⁄4 7 1⁄2 ips
Frequency Response	30Hz to 24kHz (7 1⁄2 ips)
Type	Reel to Reel
Heads	1 x erase
Motor	1 x capstan, 1 x reel
Wow and Flutter	0.08% (7.5 ips)
Output	0.775V (line)
Input	70mV (line)
Inputs	Line
Outputs	Line