15
Fig.6
d. Put back the lamp housing on its holder and secure it with the original
Allen
screw
and
Allen
key
provided.
C. Mechanical maintenance
1. Adjusting the tension of the coarse focus knob.
The collar to adjust coarse focus tension (Fig.7) is situated between the
coarse focus knob and the arm. Coarse focus tension is adjusted by the
factory. The optimum point of tension is that which permits the lightest
movement of the coarse focusing knob possible, without the stage
sinking from its own weight.
a. To adjust tension, first loosen the slotted set screw in the collar hole
with a 2mm hexagonal key.
b.
To
tighten
the
tension of the coarse focus knob, turn the collar anti-
clockwise; or to loosen it, turn clockwise.
c. Tighten the hexagonal screw.
