Olson Technology LP-DC-X - Manual (Page 10)

025-370447 REV X2 Page 10 of 10
TROUBLESHOOTING
This is a complex system and troubleshooting requires some thought.
The primary problems at turn on are poor optical connections due to contamination and reversed or
incorrectly connected cables. Confusion between the main chassis slot numbering convention from front to rear is
not uncommon.
Intermittent operational problems are probably due to laser transmitter overload. This can be due to RF
ingress. It could also be because the up converter input levels are too high. This problem tends to be much worse
during periods of high system usage.
Problems may also be caused by damaged SMB connectors at both the transmit and receive ends. Always
remove these connectors with care. Never pull on the cable or exert torque on the connector.
The band one transmitter input has a 4.5 MHz trap. Excessive 4.5MHz signals at this input can interfere
with both receiver AGC and phase lock. This problem normally appears when bench testing the units, not during
normal operation. Another 4.5MHz trap in the band 1 input will fix this problem during sweeping or NPR testing.