STEP
ADJUSTMENT
TEST TAPE
I
MODE
ITEM
SUPPLY
SIGNAL
I
l
Tape Guide
Optional
FWD
Height
I
FWD
Recording
2
I
Head Height
Optional
FWD
FWD
Erase
3
Head Height
Optional
FWD
Confirmation
4
FWD
Playback
Optional
FWD
Head Height
I
FWD
Playback 8,000 Hz
5
Head Azimuth 3-3/4 ips
FWD
Alignment
Test Tape
i
FWD
Playback
8,000
Hz
6
Head
Angle
3-3/4 ips
FWD
Alignment
Test Tape
FWD
Recording
Maxell
UD
7
Head Azimuth
15,000
Hz
REC
Alignment
-20dBm
FWD
Recording
Maxell
UD
8
Head
Angle
15,000 Hz
REC
Alignment
-20dBm
NOTES:
1.
As
perfect head adjustments
are
vital
to
tape
deck performance, be sure that these adjust-
ments are carried out properly.
2.
Be
careful not
to
use a magnetized driver or
other magnetized tools in the vicinity
of
the heads.
3.
Use
only new tape
as
level
variation
is
likely
to
occur when using old tape.
ADJUSTMENT
REMARKS
i
POINT
Tape Guide
1) Adjust
so
that tape
travels I
Height
smoothly and does not twist.
Adjustment
2)
Do
not thread tape over tension
Nut
arm.
Upper edges
of
Left Ch. head core •
(a) (b)
and tape are the same height.
Upper edge
of
Left Ch. head core
is
0.1
mm higher than upper egde
of
tape
(d) (e)
!
Upper edges
of
Left Ch. head core
and tape
are
the same height.
(f)
Maximum
output,
both channels.
Adjust head
gap
surface
so
that
(h)
there
is
no change in
output
level
when tension is applied
to
the
supply reel side.
Maximum output,
both
channels.
(c)
See
NOTE 6.
Adjust head gap surface
so
that
(g)
there
is
no change in
output
level
when tension
is
applied
to
the
supply reel side.
Fig.
8-2
4. Demagnetize heads with head demagnetizer
before and after head adjustment.
5. Set tape speed to 7-1/2 ips.
6. Set Tape Selector Switch
to
NORMAL Posi-
tion.
7. Adjustments outlined in
8-2
are
only
for
FWD
side heads. However, adjustments for
REV side heads are exactly the
same.
---------------
SERVICE
MANUAL
GX-747dbx---------------
33
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