User guide
20 November-2007 Bulletin II-102051-EN • Revision B
+./,
If DC passes through a diplexer (crossband coupler) at the base or tower top:
• Ensure the device is designed to pass DC through the intended branch and in the intended
direction.
• Ensure that (external or internal) DC blocking is present in the other branch(es).
• Do not attempt to supply DC from multiple sources to the same feeder.
• Verify operating bands of each branch if VSWR problems are encountered.
• Remember to reset alarms after changing any connections.
• Ensure all connectors are firmly engaged and secured.
• Check DIP switch settings. Cycle the switches to make sure they are fully positioned in the
desired direction. Ensure no debris is obstructing travel of the levers.
• Review marking and color coding of the Bias Tee Harness, especially where not all outputs are
used.
• Review color coding of the Alarm Cable and the logic of the Alarm Interface and EAI.
• Ensure the Alarm Range Selector is correctly set for the type of TMA used.
• D
ISABLE
all outputs and alarms. Turn the PDU O
N
, then E
NABLE
one output/alarm at a time to
locate offending outputs.
• If all front panel LEDs keep flashing on and off as the PDU is turned O
N
, this indicates failure to
start up due to multiple short circuits on outputs. D
ISABLE
all outputs to allow the PDU to start up
normally and then proceed with steps above.
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Technical support is available 24 hours a day, five days a week through the Andrew Customer
Technical Support center (CTS). Between the hours of 11 pm Friday and 8 am Monday, immediate
support is available for any critical issue causing a service outage while other support requests will
be scheduled for the next business day.
Support Engineers provide guidance for installation and operation issues as well as interactive help
with troubleshooting. They can also assist with returning and replacing defective equipment. Contact
CTS by phone at the following numbers:
)+*
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