Sokkia B20, Operator'S Manual, Page: 53 / 60

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3) Unscrew and remove the adjusting screw cover .
Fig.8.7
4) Use the adjusting pin to eliminate the difference between
b
2
’ and b
2
. (See "10. STANDARD EQUIPMENT".) In the
example shown in Fig.8.6 b
2
is larger than b
2
’. The hori-
zontal line needs to be lowered. To lower the horizontal
line, carefully loosen the adjusting screw by a small
amount using the adjusting pin
. To raise the horizontal
line, tighten the adjusting screw. (Fig.8.8)
Fig.8.8
5) Repeat steps 1) and 2) of the adjustment procedure until
the difference between b
2
’ and b
2
is small.
13
17