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Akai GX-635D Service Manual

Akai GX-635D
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Page #26 background imageLoading...
Page #26 background image
Step
Adjustment
Item
Test Tape
Supply
Signal
Mode
Adjustment
Point
Remarks
Tape
Guide
Height
Optional
FWD
Tape Guide
Height
Adjustment
Nut
1) Adjust
so
that tape
travels smoothly
and
does
not
twist.
2) Do not
thread
tape over
tension arm.
2
FWD Recording
Head Height
Optional
FWD
(a)
(b) (c)
Upper
edges
of Left Ch.
head core
and tape
are the same
height.
FWD
Erase
Head Height
Confirmation
Optional
FWD
Upper
edge of
Left Ch. head
core is
0.1 mm
higher than upper edge
of
tape.
4
FWD
Playback
Head Height
Optional
FWD
(d) (e) (f)
Upper edges
of Left Ch. head
core and
tape are
the same
height.
FWD
Playback
Head
Azimuth
Alighment
8,000
Hz
3-3l4
ips
Test
Tape
FWD
(f)
Maximum
output,
both channels.
6
FWD Playback
Head Angle
Alignment
9,000
Hz
3-3l4
ips
Test Tape
FWD
(h)
Adjust head
gap
surface
so
that there
is no
change in output
level
when tension
is
applied to
the
supply
reel side.
1
FWD Recording
Head Azimuth
Alignment
Scotch
#2ll
Tape
15,000
Hz
-20
dBm
REC
(c)
Maximum output.
both channels.
8
FWD Recording
Head
Angle
Alignment
Scotch
#211
Tape
15,000
Hz
-20
dBm
REC
(c)
Adjust head
gap
surface so
that there is no
change
in
output level
when tension
is
applied
to the
supply
reel side.
NOTES: l.
Chart-4
As
perfect
head
adjustments
aÍe vital to
tape deck
performance,
be sure
that these
adjustments
are carried
out
properly.
Be
careful
not to
use a magnetized driver
or other magnetized
tools
in
the
vicinity
of the heads.
Use only
new
tape
as level
variation is likely
to
occur
when
using old
tape.
Demagnetize
heads with
head demagnetizer
before
and after
head adjustment'
Set
tape speed
to
7-1
l2
ips.
Adjustments
outlined
in
Chart
4 are only
for
FWD
side
heads.
However, adjustments
for REV
side heads
are
exactly
the same.
2.
J,
Á
ï.
5.
6.
29

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Akai GX-635D Specifications

General IconGeneral
Track system4-track, 2-channel stereo
Total Harmonic Distortion0.8%
Outputs0.775V (line)
TypeReel to Reel
Heads3 heads
Motor2 x reel, 1 x capstan
Reel sizeup to 10.5 inch reel
Wow and flutter0.06% (7 1⁄2 ips)
Frequency response30Hz to 26kHz (7 1/2 ips)
Signal to Noise Ratio62dB
Dimensions440 x 440 x 240 mm (17.3 x 17.3 x 9.4 inches)
Output Voltage0.775V
Tape speeds3 3/4 ips, 7 1/2 ips

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