Head Adjustment; Head Height Adjustment; Head Azimuth Alignment Adjustment; Head Angle Alignment Adjustment - Akai GX-4000D Service Manual And Parts List

Vi. HEAD ADJUSTMENT
A EL
REC ANGLE PS ANGLE
tea) a) Ga 3. HEAD ANGLE ALIGNMENT
if | | ADJUSTMENT (Refer to Fig. 10)
1) Playback Head
a. Connect a High Sensitivity AC Voltmeter to the
left and right channel Output Terminals of the
tape deck.
b. Set the Track Selector to STEREO and set the
machine to 7-1/2 ips tape speed.
c. Playback an 8,000Hz 3-3/4 ips alignment
adjustment test tape.
d. Loosen screw (j). Adjust PB angle in the direc-
tion of the arrow and change the angle of the
head-to-tape contact.
Fix the PB head at a position where the output
level is not effected by an additional tension to
the supply reel.
2) Recording Head
a. Connect an Audio Frequency Oscillator to the
a 16,000Hz sine wave signal. Adjust the
Attenuator or the Line Recording Level Con-
trols to obtain a —20 dBm High Sensitivity AC
Voltmeter indication.
c. Reset Monitor Switch to TAPE and set deck to
recording mode.
1, HEAD HEIGHT ADJUSTMENT
2. HEAD AZIMUTH ALIGNMENT
d. Loosen screw (i). Adjust REC angle in the
(Refer to Fig. 10) ADJUSTMENT
(Refer to Fig. 10)
direction of the arrow and change the angle of
1) Erase Head
1) Playback Head
the head-to tape contact.
Loosen screws (a) and (b) shown in Fig. 10 and
adjust erase head height. Tighten screws at posi-
tion at which the upper edge of the tape is 0.1 mm
lower than the upper edge of the left channel head
core of the erase head.
2) Recording Head
Adjust head height adjustment screws (c) and (d)
shown in Fig. 10 so that the upper edge of the
tape and the upper edge of left channel head core
of the recording head are the same height.
3) Playback Head
Adjust head height adjustment screws (f) and (g)
shown in Fig. 10 so that the upper edge of the
tape and the upper edge of left channel head core
of the playback head are the same height.
a. Connect a High Sensitivity AC Voltmeter to
the left and right channel Output Terminals of
the tape deck.
b. Set the Track Selector to STEREO and set the
machine to 7-1/2 ips tape speed.
c. Playback an 8,000Hz 3-3/4 ips alignment
adjustment test tape.
d. Adjust adjustment screw (h) to obtain max-
imum High Sensitivity AC Voltmeter indication
on both channels.
2) Recording Head
a. Connect an Audio Frequency Oscillator to the
line input through an Attenuator, and connect
a High Sensitivity AC Voltmeter to the line
output. Then load a blank test tape.
b. Set the Monitor Switch to SOURCE and supply
a 16,000Hz sine wave signal. Adjust the
Attenuator or the Line Recording Leve! Con-
trols to obtain a —20 dBm High Sensitivity AC
Voltmeter indication.
c. Reset Monitor Switch to TAPE and set deck to
recording mode.
d. Adjust adjustment screw (e) to obtain max-
imum High Sensitivity AC Voltmeter indication
on both channels.
Fix the REC head at a position where the out-
put level is not effected an additional tension to
the supply reel.
(e.g. slightly touching the supply reel).
NOTES: 1. As head adjustment greatly affects
tape deck performance, be sure that
these adjustments are carried out
properly.
. Be careful not to use magnetized tools
near the heads.
. As the level of old tape varies greatly.
use new tape.
4. Demagnetize heads before and after
head adjustment.
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