L-852C-D ITCL Taxiway Centerline Inset Lights
Troubleshooting
©
2007 Siemens Airfield Solutions
96A0311F
Page 5-2
All rights reserved
Issued 3/05
Troubleshooting procedures for the F-Range inset lights are contained here.
NOTE:
The cordset should never be replaced because of problems disconnecting
the cordset from the PCB. If the cordset needs to be replaced, then the entire inner
cover assembly must be replaced.
Problem Possible
Cause
Corrective
Action
1. LED not energizing
LEDs defective
Replace LED assembly. Refer to
Replacing
LED Assembly
in the
Repair
section.
PCB defective
Replace the complete inner cover.
Moisture inside assembly causing
current leakage
Open up light assembly. Clean, dry, and inspect
light assembly. Replace O-ring.
No connection of primary loop.
Defective isolation transformer or
secondary wiring
Check transformer output current with true
RMS ammeter.
Check power line between the light fixture and
the transformer, including connectors.
2. Weak light output
Partial short circuit in primary loop
Check cable assembly.
Defective isolation transformer
Replace transformer.
Dirty prism
Incorrect current to fixture
Clean prism. Refer
to Cleaning Light Channel
and Prism
in the
Maintenance
section.
Check the current to the fixture to ensure it is
within FAA specifications for the selected step.
If not, adjust the CCR or repair circuit issues.
Ensure that the isolation transformers have
adequate capacity to run the fixture, especially
if using arctic kit.
3. Light beam distorted
Broken or damaged prism/cover
Replace prism or entire fixture. Refer to
Replacing Prism and Prism Gasket
in the
Repair
section.
4. Short LED life
Current too high
Check output current of isolating transformer at
full brightness. Current should not exceed 6.7
A.
Replace transformer if defective; if not, adjust
CCR output current.
2.
Troubleshooting
Procedures