Akai GX-646

ADJUSTMENT TEST TAPE MODE
ITEM SUPPLY SIGNAL
ADJUSTMENT
POINT
REMARKS
Tape Guide
=
Head Height
Confirmation
FWD Playback
Head Height
Optional
FWD
Optional
Tape Guide
Height
Adjustment
Nut
1
1) Adjust so that tape travels
smoothly and does not twist.
2) Do not thread tape over tension
arm.
FWD Recording ‘ ms
Head Height
(a) (b)
Upper edges of Left Ch. head core
and tape are the same height.
Upper edge of Left Ch. head core
is 0.1 mm higher than upper edge
of tape
Upper edges of Left Ch. head core
and tape are the same height.
FWD Playback 8,000 Hz
Head Azimuth 3-3/4 ips
Alignment Test Tape
Maximum output, both channels.
FWD Playback
Head Angle
Alignment
8,000 Hz
3-3/4 ips
Test Tape
FWD Recording Maxell UD
Head Azimuth 15,000 Hz
—20 dBm
FWD Recording Maxell UD
Head Angle 15,000 Hz
Alignment —20 dBm
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.
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 Fig. 15 are only for
FWD side heads. However, adjustments for
REV side heads are exactly the same.
Adjust head gap surface so that
there is no change in output level
when tension is applied to the
supply reel side.
Maximum output, both channels.
See NOTE 6.
Adjust head gap surface so that
there is no change in output level
when tension is applied to the
supply reel side.
Fig. 15
15