FS71C-85
Series
User
M anual
|
23
Copyright
©
2015
Fiber-Span
1.
POWER AMP CURRENT - Uplink or Downlink
The POWER AMP CURRENT Alarm is triggered when
the power amplifi er current draw exceeds the thresh-
old. This could occur when:
•
PA ALC Failure causes RF Output Power to
37 dBm
•
Internal component failure(s) within the PA
Troubleshooting Steps:
a.
Using a Spectrum Analyzer or Power Meter
and appropriate protective Power-Rated Attenuator(s),
measure the RF Output Port for the alarmed PA (DAS
Port for Downlink, Donor Port for Uplink). Be sure to
account for the protective attenuator(s) in determining
output power.
b.
If the output power is in excess of +37 dBm,
note the value and contact manufacturer Technical
Support. The HRU should be switched OFF to prevent
potential further damage.
2.
SUPPLY VOLTAGE
The SUPPLY VOLTAGE Alarm is triggered when the unit’s
internal power supply voltage exceeds the high voltage
threshold or drops below the low voltage threshold.
Troubleshooting Steps:
a.
Check the source power cable’s connection to
the HRU and verify all connections are properly seated.
b.
Using a Multi-meter, verify the electrical power
source (outlet) is within the voltage requirements of the
HRU’s specifi cation sheet. The HRU should be removed
from the power source to do this. Note the measured
voltage.
c.
Plug the HRU into the power source, switch
it on, and re-check the SUPPLY VOLTAGE Alarm status
again.
d.
If the alarm returns, contact manufacturer
Technical Support. The HRU should be switched off to
prevent further potential damage.
The DHRU software sets all key operational parameters.
See Fig 15 for the Alarm / Control Screen:
Alarm / Control Settings
• Supply Voltage Alarm
• Power Amplifi er 1 (Uplink) Current Alarm
• Power Amplifi er 2 (Downlink) Current Alarm
• Power Amplifi er 1 (Uplink) Output Set (Mute)
• Power Amplifi er 2 (Uplink) Output Set (Mute)
Diagnostics
• RF Power Amplifi er 1 (UL) Current value (mA)
• RF PA1 FWD and REV power detector (dBm)
• RF Power Amplifi er 2 (DL) Current value (mA)
• RF PA2 FWD and REV power detector (dBm)
