COMBA RXA3748 - Page 47

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Page 47
INSTALLATION GUIDE FOR RX-7W22, II2
7.4 APPENDIX D: TROUBLESHOOTING QUICK GUIDE
Alarm list:
Figure 33: Alarm list
Troubleshooting:
Over temperature
Environment temperature shall be lower than 140degF (60degC)
PLL
(Phase lock loop)
Hardware failure, RMA the equipment
LNA
(Low noise amp.)
Hardware failure, RMA the equipment
1. Handling RF connectors when RF power is ON may damage LNA
2. High power injection to DT/MT port may damage LNA
DL PA
(Downlink amp.)
Fix any other existing alarms first, then reset PA (see next page)
If alarm still exists, RMA the equipment
Shutdown
Other critical alarm causes the equipment shutdown
Follow instructions to fix other alarms first
High input
(for DT port)
Check input power to DT port, the power shall be lower than -30dBm
1. Avoid other inference
2. Put attenuator between antenna and PS BDA, if donor signal is high
Antenna Malfunction
Dry contact alarm
Low Input alarm
VSWR alarm
Signal Booster Failure
Dry contact alarm
Over Temperature alarm
PLL alarm
LNA alarm
DL PA alarm
Shutdown alarm
High input alarm
Alarms
Causes and actions
Low input
(for DT port)
DT composite input power lower than -80dBm will trigger the alarm
1. Donor antenna/passive system failure
2. Wrong channel frequency setting
3. Site is not commissioned yet
VSWR Service antenna/passive system failure