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AirCell

ST 3100 Troubleshooting Procedures

Symptom

Possible Cause

Discussion

Verification Step(s) Ken to cross over Axxess

Symptom 1
Handset Display is
not illuminated

(One or more
handsets
integrated in
system, no handset
displays are
illuminated)

Power is not available to
ASE System

The handset display should
always be illuminated when
power is applied to the ASE
Transceiver. Because the failure
of a handset display is unlikely, a
‘dead’ display suggests that
there is a problem with the input
power to the ASE system. In the
event that the one or more
handset display(s) are not
illuminated, the user/operator
should verify that aircraft power
is on and available to the ASE
Transceiver.

Verify that the aircraft power system (master avionics switch) is on.

Verify that the ASE system circuit breaker is closed.

Visually inspect the displays of all installed handsets in the system. If all
handsets are off, proceed to the next bullet in this list. If most handsets are
illuminated, but one is not, then proceed to Symptom 2.

If all handset displays are dead, the problem is likely in the power system
wiring before the ASE Transceiver. Visually check the system connections
and the wiring harness leads between the Transceiver and the aircraft power
system. Repair or reconnect any obvious problems.

If needed, ring out the power lines per the system wiring diagram. Repair
any broken wires or rework to match the system wiring diagram.

If this procedure does not resolve the problem, contact AirCell Technical
Support for additional guidance.

Symptom 2
Handset Display is
not illuminated

(ASE System has
multiple handsets,
and the displays of
most handsets are
on, but one
handset is not
illuminated.)

Bad connection or faulty
wiring between handset and
Transceiver.

Bad handset

In a system with multiple
handsets, if some handsets are
operating and some are not, then
it is likely that either the handset
is bad or the wiring between the
handset and the Transceiver is
faulty.

Some ASE systems integrate multiple handsets. If more than one handset
is installed on the system, check the display on all handsets. If only one of
multiple handsets is not illuminated, then the problem is either a bad handset
or in the handset connection / wiring harness between that handset cradle
and the Transceiver.

Perform a visual inspection to verify that all connections are made in
accordance with the system wiring diagram. Correct any obvious problems.

If all system connections are correct, then switch the ‘dead’ handset with a
known good handset and retest the system. If the handset is still dead in the
new location, then the handset is bad. Contact AirCell Technical Support for
repair/replacement instructions.

If the known good handset is now dead, then the problem is in the system
wiring/connections between the handset and the Transceiver. Ring out the
lines per the system wiring diagram. Specifically check for 9V power and
ground leads on the HS power line from the Transceiver system connector.
Repair any broken wires or rework the system wiring harness to match the
wiring diagram.

If this procedure does not resolve the problem, contact AirCell Technical
Support for additional guidance.

AirCell

ST 3100 Troubleshooting Procedures

Page A-1

Appendix A

800-10680-C, May 2007