User's Manual

Table Of Contents
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion® HSD-440 Mark 2 Terminal
23-15-30 4-80
3 JUN 10
Table 4-24 Troubleshooting and Fault Isolation
Fault Description
Maintenance
Report
Check
Red LED
remains on
after power-up
HPA uncontrolled
HPA fault
View power-up
display of the
MPU
Verify that the multicontrol,
loopback is wired (out to in).
HPA error
status
reporting invalid SSM
HPA not reporting status word
143
HPA not reporting maintenance
word 350
HPA maintenance word
reporting ARINC error
HPA maintenance word not
reporting HGA antenna
HPA maintenance word
reporting VSWR error
HPA maintenance word
reporting RAM error
HPA reporting ROM error
HPA maintenance word
reporting power supply error
HPA maintenance word
reporting temperature error
To obtain an
explanation of
the HPA error
status, in Menu
1, press Y
Check that the external power
source is properly connected and
meets installation requirements.
Check that the transmit path from
HSD-440 Mark 2 Terminal output
(MPC1) to the antenna subsystem
(e.g., coaxial cables, splitters, and
relays).
Check that the installation location
meets the RTCA/DO-160E
environmental specifications.
Check for proper fan-tray
operation and air-cooling.
Verify the fan-tray plug distribution
is as per the installation
requirements.