Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 16 P/N 57150002, Revision 5.0
F
KNB board
The KNB board contains "Hall" effect sensors that read the rotation of the magnet. The magnets are
magnetized in 3 sections. The "Hall" sensors create a signal corresponding to the knob movement.
The signal is sent to the IPC board
The KNB board also includes a function for the trigger button and LED indication.
Service
Maintenance - Servo knob calibration
A calibration of the servo and focus knobs are made in the service software if the KNB board is
replaced or removed. The calibration will read the signal from the "Hall" effect sensors during
movement of the magnet (knob) and create a table for optimum performance under different
temperature conditions.
Replacement of spare parts
• Side cover complete
• KNB board
• Trigger key
NOTE: The servo knobs can not be replaced. If knobs are broken the cover is replaced.
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