Page 5-4 Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1 Section 5 Maintenance and Troubleshooting
(b) From the diagnostic display’s main
screen, press the Status button. Note
the alarm indication(s) and refer to
Table 5-1 for troubleshooting tips,
which may also reference replacement
and subsequent re-calibration
procedures.
(c) The diagnostic display will indicate the
current active faults and more
specifically identify the nature of the
fault.
e.g., PDM Drive A Fail
(d) Attempt to clear the alarm by pressing
the reset button. If the alarm persists,
it will not be cleared from the display.
(e) In the example given in step (c), a
PDM Drive A Fail has occurred
indicating a problem with exciter A’s
interphase PDM driver PWB. The
suspect PWB should be replaced as
detailed in paragraph 5.8.1.2.
NOTE
For dual side transmitters, a changeover
to the standby side should also occur.
Determine which side caused the fault,
noting it is the opposite side to that
displayed on the transmitter status bar at
the top of the diagnostic display.
Viewing the diagnostice display’s Events
Log (see paragraph 3.6.5) can also assist
in diagnosing a fault.
(f) Other fault indications may prompt the
troubleshooter to replace other PWBs/
assemblies or an RF power module
(e.g., PA Alarm A indicates a fault has
occurred on the side A RF power
module).
NOTE
Replacement procedures (paragraphs 5.6,
5.8 and 5.9) are provided for RF power
modules and PWBs/assemblies that
require specific removal/installation or
adjustment instructions. Instructions have
not been included for assemblies that are
straightforward to replace and require no
re-calibration.
(g) If replacement of a suspect PWB or
assembly does not remove the fault
condition, contact Nautel.
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