Chapter 3
Theory of Operation
P/N 57150002, Revision 5.0 3 - 69 Trimble S, VX, SPS & RTS Service Manual
F
Block description
The distance unit consists of the following boards and units:
• TPB board, Transmitter board incl. LDB (Laser Drive Board) board and transmitter diode.
• PRB board, Receiver board incl. Receiver diode.
• Greywedge assembly incl. motor, greywedge disc and GMB board
• Laser pointer
Fig. 3-62 DR300+ / DR PLUS block diagram
TPB - Transmitter board
The TPB board is the transmitter board in the distance unit and includes the following functions:
• Laser pulse generation incl. Tx-diode
• Generates two measurement pulses to PRB
• Coarse distance measurement function
• Micro-controller for control and communication
• Storing of the distance unit firmware
Laser pointer
LDB
board
TX
diode
Greywedge
assembly
TPB board
PRB board
2coaxcables
RX
diode
SFC
board
IPC
board
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