Sony DNW-A100 Maintenance Manual page 484

7-1-3. Video Tracking Check and Adjustment
(4) Turn the height adjustment nut of TG-3
counterclockwise by one to two turns so that
the tape does not in contact with the upper
flange of TG-3.
(5) Turn the height adjustment nut of TG-4
clockwise so that the tape does not in contact
with the lower flange of TG-4.
(6) Turn the zenith adjustment screw of the AT
head so that the right portion of the RF
envelope waveform makes 20% or less of the
maximum output level. (Fig. 1)
At this time, check that the tape does not in
contact with both upper flange of TG-3 and
lower flange of TG-4.
If the tape contacts either flange, repeat step
(4) or (5).
If the tape moves upward or downward
following the height adjustment nut move-
ment, perform the following adjustment.
This trouble cause is uneven tape tension at
upside or downside of the tape caused by AT
head zenith.
. If the tape moves upward at TG-3:
Turn the zenith adjustment screw
counterclockwise.
. If the tape moves downward at TG-4:
Turn the zenith adjustment screw clockwise.
(7) Turn the height adjustment nut of TG-3 so
that the tape is in contacts with the upper
flange and the RF envelope waveform
becomes flat. (Fig. 2)
At that time, the tape does not in contact with
the lower flange of TG-4.
– Continued on the next page. –
7-24
TG-4 AT head
. Alignment tape : SR2-1/SR2-1P (00:00 to 15:00)
AT head
Zenith adjustment screw
. Alignment tape : SR2-1/SR2-1P (00:00 to 15:00)
(Tracking VR : Effective)
<Fig. 1>
RF max
100%
Markers
<Fig. 2>
Be flat
Markers
TG-3
20%
or less
Markers
If the pressure
against the tape
at TG-3 is too much,
the waveform becomes
as shown in the right
figure. (NG)
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
20%
or less