Akai GXC-570D

VI.
HEAD
ADJUSTMENT
TAPE GUIDE C
CAPSTAN |
TAPE GUIDE A
TAPE GUIDE A
HEIGHT ADJUSTMENT NUT
TAPE GUIDE 8B
TAPE GUIDE 8B
HEIGHT ADJUSTMENT NUT
——
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MIRROR
Fig. 21
. TAPE GUIDE HEIGHT ADJUSTMENT
(Refer to Fig. 20 and Fig. 21)
1) When using an ordinary cassette, the tape guides
and heads, etc. are not visible. As shown in Fig. 21,
use a cassette tape from which part of the cassette
case has been cut out and a mirror installed for
easy visibility of the head area when making tape
guide height adjustment.
2) At playback mode, using the erase head guide C
shown in Fig. 20 as standard for height, adjust
tape guide A and tape guide B height with tape
guide height adjustment nuts so that the tape runs
smoothly and does not touch on the tape guides.
. HEIGHT ADJUSTMENT OF RECORDING/
PLAYBACK COMBINATION HEAD |
(Refer to Fig. 20)
1) Utilize the cassette tape used in Tape Guide Height
Adjustment above, and playback the leader tape
part of cassette tape.
2) As shown in Fig. 20, adjust head height with
screws (A), (B), and (C) until the upper edge of
the tape is the same height as the upper edge of
the left channel REC/PB Comb. head core.
TAPE DIRECTION
Fig. 20
3. AZIMUTH ALIGNMENT ADJUSTMENT
OF RECORDING/PLAYBACK
COMBINATION HEAD (Refer to Fig. 20)
1) Playback a 10 kHz pre-recorded cassette azimuth
shes
alignment test tape and adjust screw (A) shown in
Fig.20 to obtain maximum output on both
channels.
2) Invert cassette and confirm that the output level
does not change from that obtained in Item 3-1)
above. If the output level differs, adjust in the
same way as in Item 3-1) above until both sides of
the test tape display equal output.
3) Supply a 10 kHz signal from an audio frequency
oscillator to the line inputs and record at -20 VU
on a blank tape.
4) Set Monitor Switch to “TAPE” position and
adjust screw (A) shown in Fig. 21 to obtain max-
imum output on both left and right channels.
5) The recording and playback heads are joined to
‘form a single structure. Therefore, when making
azimuth alignment adjustments, because both head
cores (recording and playback) move, repeat
adjustments outlined in Items 3-1) through 3-4)
above until optimum azimuth alignment of the
two head cores are obtained.
NOTES: 1. Be-sure to clean the heads prior to head
adjustment.
‘2. Be careful not to use a magnetized
driver or other magnetized tools in the
. vicinity of the heads.
3. Be sure to demagnetize the heads with a
Head Demagnetizer before and after
head adjustment.
4. When a mirror installed cassette test
tape as shown in Fig. 21 is required, it
can
be
ordered
from
AKAI
Electric
Co.
ne
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