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ADJUSTMENT
SLOT
COVER
PLATE
PIN
PUNCH
Figure 2-9. Vertical Travel Adjustment
e. Insert a pin punch through the adjustment slot
and into a hole of the spring tension adjustment
nut. Using the pin punch, turn the adjustment nut
clockwise to increase the tension, counterclock-
wise to decrease the tension.
f. Remove the pin punch, check and repeat
adjustment procedure as necessary to achieve
proper spring tension. The lighthead should be
able to hold its position at any angle from the VST.
g. Reinstall cover plate on the Horizontal Sup-
port Arm.
2-6. Horizontal Rotation Axis Adjustment
a. Check horizontal rotation axis adjustment by
moving the lighthead through its full range of travel
around the Balance Mechanism. See figure 2-10.
Figure 2-10. Horizontal Rotation
D
Figure 2-8. Lighthead Vertical Travel
b. The lighthead should move freely yet main-
tain its selected position within the range of motion
without drifting. If an adjustment is necessary,
refer to figure 2-9, and proceed as follows.
c. Remove two screws securing the cover plate
and remove the cover plate from the Horizontal
Support Arm.
d. Pull the lighthead downward until the adjust-
ment nut is visible through the adjustment slot in
the support arm.
C
2-5. Vertical Travel Tension Adjustment
a. Check the adjustment of the Balance Mecha-
nism for its capacity to support the lighthead through-
out its range of vertical motion. See figure 2-8.
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