Bird Technologies AT-400 - Manual (Page 51)

Maintenance
39
Troubleshooting
Operator maintenance or service is limited to battery and
fuse replacement. Any other required service must be
performed at at an authorized Bird Service Center.
Refer to the following paragraphs for help in isolating error
conditions.
The Antenna Tester will not power up.
Power for the Antenna Tester can be provided in three
ways—the internal batteries, an AC mains adapter or an
optional automobile cigarette lighter adapter. Try to power
the tester using each available means. The internal batteries
may need charged, or if recently replaced, are installed
incorrectly. The AC mains adapter may not be securely
connected, may be damaged, or there is no power supplied at
the wall receptacle. The internal fuse may have opened and
requires replacement.
If the unit was recently opened, recheck P2, the battery
connector, be sure it is securely connected. Follow the
instructions for battery and fuse replacement when opening
the unit.
NVRAM Test Fails
An NVRAM error indicates the information in nonvolatile
RAM, a type of memory, is not valid. The probable cause is
power was lost. When the unit is off, the batteries, if charged
and present, or power from the AC mains adapter, if
connected, supply power to retain stored trace data and
software settings. This information is lost if all power is
removed. Clear the error by pressing the ESC key. Be sure to
read battery charging and replacement sections if the
problem persists.