Black Box ACS4001A-R, User Manual

Page: 87 / 119

TROUBLESHOOTING
87
8. Troubleshooting
Monitor
There isn’t a picture.
Check the power supply connection at the Local and Remote Unit. Is the Power
LED at the Local and Remote Unit illuminated? If not, the internal power supply
may be damaged or there may be an internal error.
Check that the interconnection cable is connected at the Local Unit and the Remote
Unit. Is the
Link Status LED illuminated? If not, there may be a problem with the
interconnection cable:
Are there e rrors through data transmission over CATx- cable (cable too long, too
high attenuation or too much EMI interferences)? Is the Data Error LED
illuminated or blinking? If yes, check cable length and environment.
Video Okay LED is dark: CPU does not provide a video signal – Check settings of
the graphic card. Try connecting a monitor to the local output to see whether or not
there is a signal.
“Juddering” pictures at video presentations
With high monitor resolutions, the data volume that can be transferred may exceed
the available bandwidth, so the data throughput must be reduced. For this, the
device uses a RLE compression algorithm. If the necessary compression factor is
not reached, not all pictures of the graphic card are transferred (frame dropping) and
the video presentation may begin to “judder”.
Hint: Use a lower resolution, which is a little larger than the resolution of the stored
film material. If the monitor has a higher resolution, then the monitor can take over
the scaling of the video data. For the image quality it is irrelevant whether the
scaling is done via the CPU or via the monitor.
Hint: Set the colour depth to 18 bits. Usually the human eye is not able to
differentiate between so many different colours with moving pictures. A reduction
on 18 bits makes the data volume that has to be transferred smaller without loss of
image quality.