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 117 of 266
TM 9–1200–215–34&P
4–3
Section
IV – MANUAL TROUBLESHOOTING
Page
Page
General
4–3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description
4–3
. . . . . . . . . . . . . . . . . . . . .
Initial Fault Indication
4–4
. . . . . . . . . . . . . . . . . . . . . .
Manual Troubleshooting Procedures
4–5
. . . . . . . . .
4–8.
GENERAL
This chapter contains information on checks and corrective actions required to isolate defects in the PDIU, 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 PDIU to Depot”.
4–9.
FUNCTIONAL DESCRIPTION
a.
The purpose of the PDIU is to perform prognostic and diagnostic functions on a weapon system.
The PDIU
tests, detects faults, and fault isolates Line Replaceable Units (LRUs) in the Electrical System, Automatic Fire
Control System (AFCS), Vehicle Hydraulic System, and Gun Position System.
Figure 4–1 is a block diagram
showing major PDIU signal flows during operation.
VMS
DRUH
768K
MEMORY
CCA
SIGNAL
PROTECTION
MUX
DC/DC
CONVERTER
(POWER SUPPLY)
EMI
FILTER
CCA
PRESSURE
TRANSDUCER
1553
I/F
PROCESSOR
DIAGNOSTICS
PROGNOSTICS
I/O
CCA
CURRENT
SHUNT
FLOW
METER
1553
PCU
DU
ACU
PWR
BIT
VMS
BACKPLANE
Figure 4–1.
Prognostic/Diagnostic Interface Unit Block Diagram
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