43
Each character has separated into overlapping sets of red, green, and blue pixels; the effect is
like trying to watch a 3-D movie without 3-D glasses.
1. Check the interconnect cable between the Extender’s Local and Remote
Units. Is it solid-core cable, rated as Category 5? Is it intact along its length
and securely connected at both ends? And is it wired correctly? (Compare the
cable’s specs with those listed in
Section 4.2.4
and its wiring with that shown
in
Appendix A
.)
2. Check the video-extension cabling, patch-panel video connections, and other
video connections in the system. Make sure everything is properly and
securely attached.
3. The video compensation might not be set correctly. See
Section 6.4
.
4. Check the settings of the Remote Unit’s distance jumpers; you might need to
try a higher setting. See
Section 5.1
.
The monitor sometimes loses sync, causing it to go blank for a second or two.
This could happen if your electrical power system is very noisy (particularly on the
ground lead). Also, don’t route your interconnect cable anywhere near power lines
or other powerful sources of interference such as generators, motors, or
fluorescent lights. If this is a persistent problem, please discuss it with Black Box
Technical Support.
I only need video or serial extension—not keyboard/mouse control—but I can’t get a picture.
Even if you are only using the Extender for video extension (to drive video to a
remote monitor) or serial extension (to drive RS-232 to or from a remote
touchscreen or other device), the Extender’s Local Unit must still be attached to
the keyboard port of a PC or KVM switch, because that’s where it gets its power. If
your application makes it impossible to connect the Extender to a keyboard port,
call Black Box Technical Support about getting an alternative power supply for the
Local Unit.
I get a constant vertical wobble down the screen. What is the cause of this interference?
1. The interconnection cable could be located too close to a source of very
strong electrical-power interference; reroute the cable if possible.
2. If the wobble forms a standing “beat pattern,” the Extender is probably being
affected by a very strong signal from a nearby broadcast transmitter. The
solution in this case is to change the vertical refresh rate slightly (for example,
from 60 Hz to 70 Hz or vice versa).
3. You might require an alternative power supply for the Remote Unit. Call
Black Box Technical Support.
CHAPTER 8: Troubleshooting
