TM-9-1200-215-34-P
AUTOMATIC FIRE CONTROL SYSTEM (AFCS)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
FEBRUARY 1999
TM-9-1200-215-34-P - Page 38 of 266
TM 9–1200–215–34&P
2–3
Section
IV – MANUAL TROUBLESHOOTING
Page
Page
General
2–3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description
2–3
. . . . . . . . . . . . . . . . . . . . . . . .
Post–Maintenance Test
2–6
. . . . . . . . . . . . . . . . . . . . . . .
2–8.
GENERAL
This chapter contains information on checks and corrective actions required to isolate defects in the AFCS
Computer Unit (ACU) and correct the defects by means of maintenance. The manual troubleshooting shall begin
with a fault or symptom and lead to a single fault isolation of the problem. In cases where the maintenance must
be performed at a higher level, the description will note “Forward ACU to Depot”.
2–9.
FUNCTIONAL DESCRIPTION
a.
The AFCS Computer Unit (ACU) receives vehicle position data from the on–board positioning system for
ballistic computation and weapons control and calculates distance and direction to the target location entered
from the Display Unit (DU). Using stored ballistics data, the ACU calculates appropriate gun tube elevation to
reach the target. Elevation and azimuth commands are sent to the weapon’s hydraulics system to adjust gun tube
direction and elevation. The ACU automatically performs radio interface functions for the system. It controls
radios, radio network interface, intercom interface, and composition/decomposition of messages. It is the digital
processing device for the DU, interfaces with the on–board vehicle positioning system, and contains the
embedded trainer controller for simulating navigation and gun laying missions.
POWER
CONDITIONING
UNIT
VIS
TTS
AZ TACH
EL TACH
AZ SERVO
VALVE
EL SERVO
VALVE
MODE SELECTOR
VALVE
DISPLAY
UNIT
DYNAMIC
REFERENCE
UNIT
VMS
MODEM
PDIU
MVS
SERVO
CONTROLLER/
INTERFACE
CCA
DISCRETE
INTERFACE
CCA
POWER
SUPPLY
MIL–STD–1553
INTERFACE
CCA
HYD CNTRLR
RELAY
SINGLE–
BOARD
COMPUTER
CCA
SCSI PORT
ETHERNET PORT
VGA PORT
SERIAL I/O PORT
KEYBOARD/MOUSE/FLAT PANEL
DISPLAY PORT
TCIM CCA
IDE
HARD DRIVE
ACU
SINCGARS
ISA
BUS
Figure 2–1. AFCS Computer Unit Block Diagram
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