User Manual

ADCP-75-126 • Issue B • April 2002 • Section 5: Maintenance
Page 5-9
© 2002, ADC Telecommunications, Inc.
During normal STM operation, all LED’s should be green except the STANDBY LED which
should be Off. When a Minor alarm occurs, one or more of the LED’s will turn yellow. When a
Major alarm occurs, one or more of the LED’s will turn red.
During normal LPA operation, all LED’s should be Off.
Table 5-8. STM and LPA Fault Isolation and Troubleshooting
Alarm Type LED Color
Minor STM Yellow
PROBLEM: The STM is overheating.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Air intake or exhaust opening to the remote
unit cabinet is blocked
2. Ambient temperature > 50º C/122º F.
3. Faulty fan.
1. Remove cause of air-flow blockage.
2. Reduce ambient temperature.
3. Replace STM fan (See Section 5.4).
Alarm Type LED Color
Minor HOST UNIT Yellow
Problem: A minor alarm is detected at the HU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The HU is overheating. 1. Check HU for alarms and refer to Table 5-7
Alarm Type LED Color
Minor PA Yellow
PROBLEM: The LPA is overheating.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Air intake or exhaust opening to the remote
unit cabinet is blocked
2. Ambient temperature > 50º C/122º F.
3. Faulty fan.
1. Remove cause of air-flow blockage.
2. Reduce ambient temperature.
3. Replace LPA fan (See Section 5.5).
Alarm Type LED Color
Major AC POWER Red
PROBLEM: The RU is powered by the back-up battery system
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The AC power system circuit breaker is open
or the AC power has failed.
1. Check the AC power system, repair as needed,
and reset circuit breaker.
Alarm Type LED Color
Major HOST UNIT Red
PROBLEM: A major alarm is detected at the HU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The HU has failed. 1. Check HU for alarms and refer to Table 5-7.