Clear-Com Intercom Systems KB-212 Speaker Station
© Clear-Com Intercom Systems 2000
11
Rev. B
Scenario 2
Channel unterminated.
Solution: Set the Main Station or Power Supply termination switch for the
appropriate channel to the ON position.
Scenario 3
The KB-212’s microphone is too close to an open speaker on the same
channel.
Solution: Change the units’ location.
•
Excessive crosstalk
Scenario 1
High DC resistance in ground return.
Solution: Use heavier cable; add additional conductor(s) to ground return. If
the cable run is exceptionally long, consider adding and using the EB-4W 4-
Wire Option Module.
Scenario 2
Multi-channel cable pairs are not individually shielded.
Solution: Replace cable with individually shielded pairs.
•
Program signal sounds distorted.
Scenario 1
Program Level control set too high.
Solution: Turn the Program Level control counter-clockwise.
Scenario 2
Overload of Program Input circuit.
Solution: Reduce the gain of the program signal at the source, such as an
audio mixer.
•
The call signal does not function.
Scenario 1
Excessive DC loading of intercom line.
Solution: Remove any audio transformers or other equipment that may be
connected across the intercom line. If equipment other than Clear-Com
intercom equipment must be connected to the intercom line, please contact
Clear-Com application or service personnel for information or
recommendations.
Scenario 2
Far too many terminations on the intercom line.
Solution: Check all main stations and power supplies to make sure each
intercom channel is terminated at only one point.
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