Instruction manual

41
●
Adjustmen
t
1
Unscrew the cross-hair
adjustment section cover.
2
Find Point D at a point
between Points C and B,
which should
be equal to 1/4th the
distance between Points
B and C and measured
from Point C. This is
because the apparent
error between Points B
and C is four times the actual error since
the telescope has been reversed twice during the checking
operation.
3
Shift the vertical
cross-hair line and
coincide it with
Point D, by revolving
the left and right
capstan adjustment
screws with the
hexagonal wrench*
(or adjusting pin).
Upon completing the
adjustment, repeat
the checking
operation once more.
If Points B and C coincide, further adjustment is not required.
Otherwise, repeat the adjustment.
● First, loosen the capstan adjustment screw on the side to
which the vertical cross-hair line must be moved. Then tighten
the adjustment screw on the opposite side by an equal
amount which will leave the tension of the adjustment screws
unchanged.
Revolve in the counterclockwise direction to loosen and in the
clockwise direction to tighten, but revolve as little as possible.
● Perform following adjustment after completing above adjust-
ment . Section 8.6 “Adjustment of Vertical Angle 0 Datum”.
Capstan
adjustment
screw
Eyepiece
Capstan
adjustme
nt
screw
*DT-205/207/209/209P : Hexagonal wrench
DT-205L/207L/209L : Adjusting pin