locate the components of the LD/R. Components with a reference designator
beginning with A1 correspond to the electronics assembly, and components
beginning with A2 correspond to the transceiver assembly. Below are some of
the key components of the LD/R, listed by their noun name and reference
Power supply card.
Control logic card.
Optical bench assembly.
Transceiver housing assembly.
Energy control card.
diagram divides the operation into six major functions: (1) the power
supply, (2) the transmitter, (3) energy control, (4) the receiver, (5)
display, and (6) control logic/microprocessor. All components and signals
are within the LD/R unless otherwise noted.
The block diagram's six functions are operationally grouped, but not
find the receiver card located in the transceiver assembly.
You also see
the microprocessor and the range counter in the control logic card, located
in the electronics assembly.
The use of reference designators helps keep
you focused on what is happening in the system during operation.
following paragraphs describe the six major operational functions.
a. Power Supply Function.
Power for the G/VLLD comes from the 24 V
battery, or from external power supplied by the vehicle through the EMI
The power supply function consists primarily of three power
supplies: the low voltage power supply (LVPS), the pulse forming network
(PFN) power supply, and the simmer power supply. The LVPS distributes +24
V, +15 V, -15 V, and +5 V outputs throughout the LD/R to operate the
The PFN and simmer outputs go to the transmitter function to
provide power for the lasing action.