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VC-483GS,GB,N
A/C HEAD HEIGHT AND TILT—CHECK AND
ADJUSTMENT
e Checking
* Once the tape is travelling smoothly around the A/C
head and the height has been roughly adjusted, ad-
just the height and azimuth of the head with an
1. Select the PLAY mode with a 180 minute tape
loaded.
2. Check that the tape is not curling on the flanges
of the take-up stationary guide.
3. Check that the A/C head has the height and tilt
shown in Figure 25 with respect to the tape.
A/C Head
T. Stationary
A/E Head
Figure 25
e Adjustment
* If there is any abnormality in the travel mode, carry
out the following adjustments
with reference to
Figure 23 and Figure 25.
1. Check the running of the tape in the PLAY mode
using a 180 minute tape.
2. Check that the tape moves cleanly and smooth-
ly, and remains completely flat as it travels from
the guide roller to the take-up impedance roller,
from the take-up impedance roller to the take-up
stationary guide, and from the take-up stationary
guide to the capstan shaft.
3. If the tape is slightly misaligned between the A/C
head and the take-up stationary guide it will be
absolutely impossible to achieve a satisfactory
picture, so check that the tape does not ride up
on the flanges of the take-up stationary guide and
that there are no small creases.
4. lf adjustment is needed, adjust by means of screw
(2). Turn screw (2) little by little.
Note:
Do not move the take-up stationary guide.
5. The height of the A/C head should be positioned
with respect to the tape as shown in Figure 25.
16
alignment tape.
1. Reproduce a 1 kHz Audio signal (the video is a
color bar)on the alignment tape, and measure
TP601
(GND is TP602) on the audio board, on the
oscilloscope.
2. Turn the setscrews (2), and @) slowly to achieve
maximum output level. At the same time, adjust
for minimum
level variation.
3. Reproduce a 6 kHz Audio signal (the video is a
stepped wave) on the alignment tape, and meas-
ure TP601
(GND is TP602) on the audio board,
on the oscilloscope.
4. Adjust the azimuth adjustment screw 8) (3P +
8S) to achieve maximum
audio output level.
5. Recheck the tape travel adjustment.
TAPE TRAVEL ADJUSTMENT
iL.
2.
Adjust and check the height of the reels with the
master plane and the reel height adjustment jig.
Check and adjust the S! reiler and the stationary
guide using the stationary guide adjustment jig as
shown in Figures 21 and 22.
. Check the position and verticality of the tension
poles using the tension pole adjustment jig as shown
in Figures 13 —
15.
Play a rough adjustment tape and carryout a rough
adjustment of the height of the guide rollers using
a regular screwdriver. (a guide roller height adjust-
ment — screwdriver). Line up the lower edge of the
tape with the lead of the drum (See Figure 27).
Also check that the tape does not curl on the flanges
of the T.S. guide rollers.
. Play a standard tape and fine adjust the height of
the guide rollers so that the envelope is flat, and not
too adversely affected even when the tracking knobs
are rotated (See Figure 27).
Also, adjust the SW point to 6.5 H + 0.5 H.
. Adjust the height, tilt, and azimuth of the A/C Head
as shown in Figure 25.
. Set the tracking knobs to the preset position. Ad-
just the position of the A/C Head so that the enve-
lope is a maximum, with the adjusting nut (6) (See
Figure 23).
. Confirm the flatness of the envelope and the sound
with an auto video recording.
. After adjustment, apply screw-lock adhesive to all
adjusting screws and nuts.
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