User Manual

ADCP-75-150 • Preliminary Issue A • March 2003 • Section 5: Maintenance
Page 5-10
© 2003, ADC Telecommunications, Inc.
During normal LPA operation, the STATUS LED should be blinking green (normal operation)
or blinking yellow (minor fault).
4 TEST PROCEDURES
This section provides procedures for common troubleshooting and maintenance tests. Refer to
these procedures as needed when specified in the Fault Isolation and Troubleshooting tables in
Section 3.
4.1 Optical Power Test
A break in an optical fiber or a fault with the optical connector will interrupt communications
between linked components or generate excessive errors. Use the following procedure to isolate
a problem with an optical fiber or connector.
Table 5-9. LPA Fault Isolation and Troubleshooting
LED: STATUS Color: Green Alarm Type: None
PROBLEM: The LPA is in the forced shutdown state.
POSSIBLE CAUSES
1.The MUTE/NORM/RESET switch is in the
MUTE position or the LPA was set in the dis
-able mode through the DEMS computer.
1.Place MUTE/NORM/RESET switch in the
NORM position or use DEMS to enable the LPA.
LED: STATUS Color: Yellow (blinking) Alarm Type: Minor
PROBLEM: The LPA detects a minor fault.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The LPA fan has failed. 1. Replace LPA fan. (see Section 5.5)
LED: STATUS Color: Red Alarm Type: Major
PROBLEM: The LPA is in a forced shutdown state.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. The STM to LPA connecting cable is faulty.
2. The LPA fan has failed allowing overheating.
3. Air intake or exhaust opening to the remote
unit outdoor cabinet is blocked.
4. Ambient temperature > 50º C/122º F.
5. The LPA is faulty.
1. Inspect cable and repair or replace if faulty.
2. Replace LPA fan. (see Section 5.5)
3. Remove cause of air-flow blockage.
4. Reduce ambient temperature
5. Replace LPA.
Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser radiation
can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do not
look directly into the optical transmitter of any unit or exposure to laser radiation may result.
An optical power meter should be used to verify active fibers. A protective cap or hood MUST
be immediately placed over any radiating transmitter or optical fiber connector to avoid the
potential of dangerous amounts of radiation exposure. This practice also prevents dirt particles
from entering the connector.