Akai GX-260D

RANK
2. HEAD AZIMUTH ALIGNMENT
ADJUSTMENT
1) Forward Playback Head
a) Connect a high sensitivity V.T.V.M. to the
output terminals.
b) Set the Tape Speed Switch to 7-1/2 ips, turn
Line Output Level Controls to maximum, and
set recorder to forward playback mode.
c) Playback an Alignment Test Tape (Ampex
Alignment Test Tape 8,000 Hz, 3-3/4 ips re-
corded).
d) At forward playback mode, adjust Azimuth
Alignment Adjustment screw C by turning to
left and right until the line output level of
‘both channels is maximum.
e) After the adjustment outlined in Item d) above
has been completed, loosen screws o and p
and move the gap side of the playback head
to left and right, and position so that when
tension is applied to the supply reel. side, the
line output level of both channels does not
fluctuate. When a maximum allowable fluctu-
ation of within +0.5/—O dB is attained, tighten
screws. 0 and p.
2) Reverse Playback Head
a) Follow “Forward Playback Head” procedure
through Item c). Then, at. reverse playback
mode, adjust Azimuth Alignment Adjustment
Screw i by turning to left and right until the
line output level of both channels is maximum.
b) After the adjustment outlined in Item a) above
has been completed, loosen screws q, r and
move the gap side of the playback head to
left and right, and position so that when ten-
sion is applied to the supply reel side, the
line output level of both channels does not
fluctuate. When a maximum allowable fluction
of. within +0.5/-0 dB is attained, tighten
screws q, f.
3) Forward Recording/Erase Head
a) Connect an Audio Frequency Oscillator to
the line inputs and an high sensitivity V.T.V.M.
to the line outputs, and load a blank: tape.
b). Set the Monitor Selector Switch to TAPE posi-
tion, and record a 16 kHz signal. at —10 dB
level ‘at forward recording mode.
14
HEAD OUTPUT (mv) ; Y
7OOHZ—G VU— 7-1/2 ips
Chart 2 Fig. 14
c) At forward recording mode, adjust Azimuth
Alignment. Adjustment Screw f by turning. to
left and right until the output level of both
channels is maximum and does not fluctuate.
d) After the adjustments outlined above have been
completed, loosen Fwd recording head mount:
ing screws s, t and move lever g to left and
right and adjust the gap side of the recording
head so that when tension is applied to the
supply reel, the line output level of both
channels does not fluctuate. When a maximum
allowable fluctuation of within +0.5/—0 dB is
attained, tighten screws s, t.
4) Reverse Recording/Erase Head
a) In the same way as the forward recording,
record at reverse recording mode.
b) At reverse recording mode, adjust Azimuth
Alignment Adjustment Screw 1 by turning to
left and right until the output level of both
channels is maximum and does not fluctuate.
c) After the adjustments outlined above have been
completed, loosen reverse recording head
mounting screws u, v and move lever n (refer
to Fig. 13) to left and right and adjust the
gap side of the recording head so that when
tension is applied to the supply reel side, the
line output of both channels does not fluctuate.
When a maximum allowable fluctuation of
which +0.5/—0 dB is attained, tighten screws
u, Vv.
3. For best results, head demagnetizing should
be performed before adjustments. All adjust-
ments outlined in sections 1 and 2 should
be repeated two or three times. Blank tape
used in adjustments should be new tape.
NOTE
1) In order to keep the difference in playback level
between normal and reverse playback as small as
possible, the FWD/Playback and the Rev/Playback
Heads are categorized and marked “NA” to “NE”
respectively. (See Fig. 14 and Chart 2)
2) When a playback Head is replaced, it is imperative
that the same rank head be installed as was
previously used.
In case the previously installed head rank is not
available, both heads can be replaced with other
heads of the same marks.
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