Akai GXC-750D

VI. HEAD ADJUSTMENTS
TAPE GUIDE (А) ТАРЕ GUIDE(C) ТАРЕ GUIDE (8)
TAPE GUIDE(A) TAPE GUIDE (B)
HEIGHT ADJUSTMENT NUT
HEIGHT ADJUSTMENT NUT
== a
ERASE HEAD REC/PB COMBINATION
Е4-165 HEAD PR4-2
Fig. 11
. TAPE GUIDE HEIGHT ADJUSTMENT
(Refer to Figs. 11, 12)
1) When using an ordinary cassette, the tape guides
and heads, etc. are not visible. As shown in Fig. 12
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.11 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 catch on the tape guides.
. HEIGHT ADJUSTMENT OF RECORDING/
PLAYBACK COMBINATION HEAD
(Refer to Fig. 11)
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. 11 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 Combination head core.
MIRROR
3. AZIMUTH ALIGNMENT ADJUSTMENT
OF RECORDING/PLAYBACK
COMBINATION HEAD (Refer to Fig. 11)
1) The cores of recording and playback heads are
mounted in a single head holder to form the
recording/playback combination head otherwise
known as the New GX Head. Both recording
and playback head cores move when azimuth
alignment is adjusted. To obtain optimum play-
back head core azimuth alignment, follow the
instructions 2) — 5) carefully.
2) Playback a 10 kHz azimuth alignment adjustment
test tape and adjust the adjustment screw (A) until
the output level of both channels are at maximum.
3) Invert cassette and see whether there is an output
level difference from the above. If there is a
difference, repeat 2) and readjust.
4) Record а 10 kHz, -20 VU signal from the audio
frequency oscillator.
5) Rewind and check for any fluctuation in the
output level at playback.
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. 12 is required, it can be
ordered from АКА] Electric Co.