Ericsson LBI-39128 manual Maintenance

Page 35

 

 

MAINTENANCE

LBI-39128

 

 

Table 10 - Troubleshooting Symptoms (Continued)

 

 

 

 

 

SYMPTOM

POSSIBLE CAUSE(S)

CORRECTIVE ACTION

 

 

 

 

 

Constant transmitter alarm for one

Lower Alarm Limit is set too high or

Check and possibly re-configure the

 

transmitter, but transmitter’s power is

Upper Alarm Limit is set too low.

alarm limit(s) (see the Parameters

 

OK.

 

heading in the Operation section).

 

 

 

 

 

 

Power sensor at output of transmitter

Check and possibly re-calibrate the

 

 

needs calibration or is defective.

power sensor (see the Power Sensor

 

 

 

Calibration heading in this section).

 

 

 

 

 

 

Cable from the power sensor to the

Check the continuity of the cable from

 

 

PMU (can be many cables and

the power sensor to the PMU (see the

 

 

connectors in series) is connected to the

interconnection diagrams at the end of

 

 

wrong point or is defective.

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

Power sensor at output of transmitter

Check and possibly re-calibrate the

 

transmitter, but transmitter’s power is

needs calibration or is defective.

power sensor (see the Power Sensor

 

OK.

 

Calibration heading in this section).

 

 

 

 

 

Occasional transmitter alarm for more

Alarm Delay parameter is set too short

Adjust the Alarm Delay parameter (see

 

than one transmitters, but each

(value too low).

the Alarm Delay Adjustment heading in

 

transmitter’s power is OK.

 

this section).

 

 

 

 

 

A transmitter alarm is not reported

Lower Alarm Limit is set to zero.

Re-configure the Lower Alarm Limit

 

when a cable between the transmitter’s

 

parameter for the transmitter to some

 

power sensor and the PMU is

 

non-zero value (see the Parameters

 

disconnected.

 

heading in the Operation section).

 

 

 

 

 

 

The transmitter channel is not PMU

Replace the Site Controller computer’s

 

 

enabled in the Site Controller

Personality PROMs with a new set that

 

 

computer’s Personality PROMs.

has all transmitter channels PMU

 

 

 

enabled. (see the Site Controller

 

 

 

Software heading in the Installation

 

 

 

section).

 

 

 

 

 

A transmitter alarm is reported to the

The fault tolerance level may have been

Check the Alarm Control Display

 

System Manager and someone turns off

exceeded (when the channel was turned

screen in the System Manager to see if a

 

that transmitter channel from the Site

off from the System Manager, reducing

is shown to the right of Power Mntr

 

Reconfiguration Channel screen in the

the number of total channels by one),

indicating that the fault tolerance has

 

System Manager - then later turns back

causing the alarmed channel to be

been exceeded. If the fault tolerance has

 

on, sees that the transmitter alarm is still

assigned as if normal. This is most

been exceeded, change the fault

 

being reported, yet also sees that the

likely to happen if the total number of

tolerance level or fix the alarmed

 

channel is being assigned to calls.

channels is small.

transmitter.

 

 

 

 

 

 

 

 

 

 

35

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Contents Installation & Operation Contents Table of Contents List of Figures and Tables Figures and TablesSpecifications SpecificationsLBI-39128 Personality Proms VAX Site Controller ComputerApplication Software Proms Site Controller Software Site Controller HardwareAddition from No PMU PMU HardwareApplication Software PROMs Personality PROMsParts Required ProcedureDB-9 M DB-9 F Trunking Card Upgrade from Old PMUAdaptation from Old PMU Initial POWER-UP Software Initialization Terminal SetupPMU Programming Sentry PMU REV 8.6 12/07/94 Time/Date/Password Antenna Mapping Unidirectional Power Sensors Power Sensor CalibrationBi-directional Power Sensors Final Check Monitor StartupSWR Calculations AlarmsPower Measurements Excessive Alarms Alarm ReportingTransmitter Alarms Antenna AlarmsPMU Model Channel PMU EnableSite PMU Enable ParametersOperation Antenna Upper Alarm Limit Transmitter Lower Alarm LimitTransmitter Upper Alarm Limit Antenna Lower Alarm LimitAntenna Power Alarm Limits Alarm Limit RE-CONFIGURATIONTransmitter Power Alarm Limits Alarm Limits As InstalledAntenna SWR Alarm Limit Channel Monitor Screen Time and Date AdjustmentDiagnostic Screens Alarm History Report ScreenAlarm History Report Site not Programmed Time Erase ALL Programming Software UpdatesAlarm Delay Adjustment Symptom Possible Causes Corrective Action TroubleshootingMaintenance Glossary GlossaryInterconnection Diagram PMU Interconnection Diagram Edacs Site Controller Cabinet

LBI-39128 specifications

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