Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 88 P/N 57150002, Revision 5.0
F
Fig. 3-80 Servo focus unit
The module consists of two main parts: SFC board and the mechanics. Both parts are connected by
2 screws. The site of the mechanics is attached in the telescope by 3 screws.
Fig. 3-81 Mechanical structure
The servo focus drive uses a stepper motor in full-step mode for the movement of the focusing lens
forward and backwards in the telescope. The mechanical part of the focus drive is aligned so that the
focusing lens travels exactly along the optical axis of the telescope.
The manual focusing is operated by the focus-knob on the servo side cover, the information is sent to
the IPC board. The instrument manager, IM on the IPC board processes the focus knob movement
and sends it to the SFC board. The servo focus motor is controlled by the SFC board.
SFC board
Light barrier
1,5 m
8
stepper motor
Mechanics with
Focusing lens
4
Shifting lens
Front lens
Focusing drive
Focus servo motor
Eyepiece
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