Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 85 Trimble S, VX, SPS & RTS Service Manual
F
Fig. 3-78 Tracker unit block diagram
Tracker-Transmitter
The functions of the TFB board with transmitter diode are:
• Controlling the laser transmitter for the tracker
• Class 1 laser safety including a single fault protective circuitry
Tracker-Receiver
The OTR board incl. quadrant detector:
• Receives the signal via the quadrant detector
• Converts the signal from the quadrant detector to a proportional current and amplify the signal
if necessary
The OTA board:
• Converts the signal to a vertical and horizontal deviation signal
• Amplifying the signal
The OTC board:
• Rectifies and low pass filtrates the signals, A/D converted and sent to the processor.
• Controls coarse/fine segments on the quadrant detector
• Controls amplification on the OTR and OTA board
Service
Maintenance
• Tracker receiver alignment check
• Tracker transmitter alignment check
• Laser pointer alignment. Tracker transmitter is aligned with the laser pointer, when aligning
laser pointer the tracker transmitter is also aligned
TFB
OTR
Transmitter
diode
Quadrant
detector
OTAOTC
Transmitter
Receiver
Tracker unit
S
F
C
I
P
C
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