22
Contents
Previous
Page
First
Page
Next
Page
Previous
View
7.6
Turn knob clockwise and ensure that drag begins to be felt at a setting between 1 and 1.5 on the
drag knob. Repeat
Para 7.4
until this can be achieved.
7.7
Secure knob with screw
(2)
and refit knob centre
(3)
.
Operation in low ambient temperatures
8
Use of the Vision 10LF head in ambient temperatures below -20° C may result in excessive drag in the
pan and tilt axes. Should this problem arise it can be overcome by adjustment of each drag setting knob as
follows (
Fig 4.1
):
8.1
Release the pan and tilt brakes.
8.2
Prise out the centre of the appropriate drag control knob
(3)
.
8.3
Turn the knob
(1)
fully counter-clockwise to its minimum setting and slacken the retaining screw
(2)
.
8.4
Pull the knob gently outwards while keeping it turned against the stop.
8.5
While pulling the knob outwards, undo the retaining screw until the knob clears the stop and is
free to turn further in a counter-clockwise direction. Do NOT undo the retaining screw any further.
8.6
Turn the knob counter-clockwise until it clears the stop and can be pushed in to its normal
position on the shaft.
8.7
The drag mechanism is now at its new maximum setting and can be adjusted to the preferred
setting as detailed in
Para 7
.
8.8
After adjustment secure knob with screw
(2)
and refit knob centre
(3)
.
9
When the head is returned to normal temperature operation the mechanism may be re-set by reversing
the above procedure.
Brake knob adjustment
10
The pan and tilt brakes are set during manufacture so that, when the brakes are fully applied, the knob
is vertical. As the brakes bed in during use it may be necessary to reset the knobs to this position.
11
The procedure for resetting the pan and tilt brake knobs is as follows (
Fig 4.2
):
11.1
Prise out the centre of the appropriate brake knob
(4)
.
11.2
Turn the knob
(2)
clockwise to fully apply the brake.
11.3
Remove the retaining screw
(3)
and pull the knob
(2)
off the shaft
(1)
.
11.4
Refit the knob on the shaft in the vertical position.
11.5
Turn the knob fully counter-clockwise and ensure the brake is released
11.6
Turn the knob clockwise and ensure that the brake is fully applied when the knob is vertical.
Adjust the position of the knob if necessary.
11.7
Secure the knob with the screw
(3)
. Refit the knob centre
(4)
, using Silcoset 153.