User's Manual

ABBREVIATED COMPONENT MAINTENANCE MANUAL
1458-A-1101 / 1458-A-1300
F. Fault Isolation (Subtask 23-15-30-810-006-A01)
(1) Testing
(a) Power-Up Test
1
The power-up test verifies basic SDU functions and uses the front-panel LEDs
to communicate the results.
2
The fault LED indicates several possible internal SDU system problems, not specific
problems, refer to Table 13.
Table 13. LED Status Indicators Table
Power LED State Fault LED State Indicates Action
ON for 60 seconds during
boot-up, then OFF
ON Normal operation during
boot-up
-
OFF OFF Normal operation
-
OFF ON LRU fault Use Interactive Mode
BITE via CMS to confirm
fault, remove the LRU
and return it to the factory
OFF Flashing System fault, not
necessarily with the
A350 LRU
Use Interactive Mode
BITE via CMS to isolate
fault, use confirmation
method of suspect LRU
to confirm fault
Flashing Flashing Self-test
-
3 Some of the possible LRU faults indicated by the lit fault LED include:
• Software image incorrect or corrupted
• Internal busses non-operational
• Internal processors non-functional.
4
To find th
e equipment or connection that failed, check the interactive mode BITE
pages. So
me examples of possible SDU system faults indicated by the flashing
fault LED
includes:
• Strapped configuration does not match the capabilities of the A350 SDU system
or the configuration in the ORT - check the wiring and strapping
• Code images in the SDU do not match the expected configuration - check the
software version and your configuration
• RF path from the SDU to D/LNA failed - check wiring and cable loss settings
• USIM not detected.
(b) Troubleshooting Guidelines
1
If the front-panel LEDs signal that the SDU is operating normally and some services
are still not available:
• Verify your SATCOM system - view to satellite, SCM installed
EFFECTIVITY
ALL
23-15-30
Page 53 of 70
5 Oct 2012
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Interim DRAFT for FCC Approval Purposes
Do Not Use for Maintenance
10-Feb-2013