Filter
Top Products
MAINTENANCE LBI-39128
35
Table 10 - Troubleshooting Symptoms (Continued)
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
Constant transmitter alarm for one
transmitter, but transmitter’s power is
OK.
Lower Alarm Limit is set too high or
Upper Alarm Limit is set too low.
Check and possibly re-configure the
alarm limit(s) (see the Parameters
heading in the Operation section).
Power sensor at output of transmitter
needs calibration or is defective.
Check and possibly re-calibrate the
power sensor (see the Power Sensor
Calibration heading in this section).
Cable from the power sensor to the
PMU (can be many cables and
connectors in series) is connected to the
wrong point or is defective.
Check the continuity of the cable from
the power sensor to the PMU (see the
interconnection diagrams at the end of
this manual).
PMU input circuit is defective. Apply a dc voltage (negative ground) to
the power sensor end of the cable to the
PMU (see Table 7 for the voltage to
represent the expected power). Turn off
transmitter at 12V power supply, turn
back on, and wait for test call. If the
alarm remains, the cable or the PMU
input is defective.
Occasional transmitter alarm for one
transmitter, but transmitter’s power is
OK.
Power sensor at output of transmitter
needs calibration or is defective.
Check and possibly re-calibrate the
power sensor (see the Power Sensor
Calibration heading in this section).
Occasional transmitter alarm for more
than one transmitters, but each
transmitter’s power is OK.
Alarm Delay parameter is set too short
(value too low).
Adjust the Alarm Delay parameter (see
the Alarm Delay Adjustment heading in
this section).
A transmitter alarm is not reported
when a cable between the transmitter’s
power sensor and the PMU is
disconnected.
Lower Alarm Limit is set to zero. Re-configure the Lower Alarm Limit
parameter for the transmitter to some
non-zero value (see the Parameters
heading in the Operation section).
The transmitter channel is not PMU
enabled in the Site Controller
computer’s Personality PROMs.
Replace the Site Controller computer’s
Personality PROMs with a new set that
has all transmitter channels PMU
enabled. (see the Site Controller
Software heading in the Installation
section).
A transmitter alarm is reported to the
System Manager and someone turns off
that transmitter channel from the Site
Reconfiguration Channel screen in the
System Manager - then later turns back
on, sees that the transmitter alarm is still
being reported, yet also sees that the
channel is being assigned to calls.
The fault tolerance level may have been
exceeded (when the channel was turned
off from the System Manager, reducing
the number of total channels by one),
causing the alarmed channel to be
assigned as if normal. This is most
likely to happen if the total number of
channels is small.
Check the Alarm Control Display
screen in the System Manager to see if a
♦
is shown to the right of Power Mntr
indicating that the fault tolerance has
been exceeded. If the fault tolerance has
been exceeded, change the fault
tolerance level or fix the alarmed
transmitter.