Chapter 3
Theory of Operation
Trimble S, VX, SPS & RTS Service Manual3 - 40 P/N 57150002, Revision 5.0
F
Fig. 3-40 Horizontal Turning Unit High Angle Accuracy
Correction file
The Horizontal Turning Unit unit is calibrated at the factory and includes a correction table, this table
is stored in the IPC board in the instrument. When an angle is produced the correction table will then
improve and calculate the high angle accuracy.
The correction file is available on Partners / Service Instrument Constant Search.
Service
When replacing the Horizontal Turning Unit a new correction table needs to be installed in the
instrument.
Each Horizontal Turning Unit has a serial number and the correction table (file) has the same name.
Service
Maintenance
• A centering tool is required when mounting the vertical MSB board incl. motor winding.
• Servo and angle system calibration (PASS)
Replacement of spare parts
• Horizontal angle disc
• Vertical angle disc
• MSB board incl. motor winding (horizontal and vertical are the same)
• 1” instruments - Horizontal Turning Unit 1”
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