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21.3.5 Connecting External Video Devices
Most SwitchPoint Infinity® 2 Control System installations have
extra inputs and outputs for video. Some are terminated on the
boom for easy access. The video signals use standard 75 ohm
coax and BNC connections. One of the more common devices
connected is the fluoroscope or C-arm. There are two things to
be aware of when connecting these:
1. Older model C-arms have a small termination switch
next to the BNC connection. If you are not connecting
an external device to the C-arm, the switch must be in
one position. This position puts a 75 ohm resistor across
the output to properly terminate the video. If you are
connecting an external device, the switch needs to be
turned off. The wrong position will cause the video
signal to be attenuated. Try both positions; it will be
obvious which is correct.
2. New C-arms have multiple outputs, one of which is scan-doubled. Scan-doubling is an analog version of
higher resolution video. This won’t display correctly on a standard monitor or the SwitchPoint Infinity® 2
Control System. On GE C-arms, the I/O panel has three jacks with small TV icons above the BNC
connector. One has twice as many lines in it. This is the scan doubled output. Use one of the other jacks.
Try all three to determine which one works the best.
21.4 Troubleshooting Audio
21.4.1 Audio Not Leaving The Room
•
Check the wireless microphone batteries. The LED on
the top should light up momentarily when powered on,
then go out. If it stays on, the battery needs to be
replaced.
•
Check the wireless receiver. The front panel should
display RF level bars and AF level bars when talking into
the microphone.
•
Make sure Private is not turned “ON” on the touch panel.
•
Make sure the wireless microphone input volume is
turned up.
•
Make sure your location is connected to the other room
or to an off-site location.
•
When using the Codec, make sure that the near side is
not muted.
21.4.2 No Audio In The Room
•
Check that Main Volume In is turned up and is not
muted.
•
Make sure Private is not turned ON, on the menu bar.
•
If you are playing a VCR tape, check that the VCR Volume In is turned up.
•
Make sure that the wires connected to the room speaker are connected and the Speakon connector on the
front panel of the SwitchPoint Infinity® 2 Control System is twisted and locked.
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