Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 89 Trimble S, VX, SPS & RTS Service Manual
F
During start-up routine the light barrier at the close position detects the position of the focusing lens.
After this the focusing lens will be positioned at the previous distance where the telescope was set
before switching off.
There is a second light barrier at the infinite side of the module. Both light barriers protects servo
focus unit against accidental overrun.
Functional Block diagram
Fig. 3-82 Servo Focus block diagram
The SFC board is also controlling:
• Tracklight
• Reticle illumination
Service
Maintenance
Checks of the mechanics, regreasing of spindle arm
Checks of correct positioning (supported by Service Software)
Adjustment and calibration (supported by Service Software)
Replacement of spare parts
• SFC board
• Mechanic part
Servo focus
Reticle
illumination
Tracklight
motor
SFC board
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