Black Box ACS235A - Manual (Page 92)

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CHAPTER 7: Troubleshooting
7. Troubleshooting
7.1 Things to Try First
Here are a few problems that sometimes occur in a ServSwitch™ Brand Fiber KVM
Extender system, along with possible causes and solutions.
Problem: I can’t get a picture on my monitor screen.
Check the LEDs on the rear panels of the Extender units:
• If they’re lit: Is the monitor plugged in and turned ON? Is it in screen-saver
mode? Is its cable loose?
• If they’re dark: Are the Extender units plugged into a working outlet? Is the
CPU actually plugged in, turned ON, and running? Is the CPU-extension cable
loose? Is the fiber cable loose? Are any strands of the fiber broken—at the
remote site, can you see a small red dot when you hold each fiber connector
up to a white sheet of paper? Is the fiber the right type (50/125-µm or
62.5/125-µm gradient-index multimode)? (If everything seems like it ought to
be working, the power supplies of one or both Extender units might be
damaged.)
Problem: The picture on my monitor screen rolls uncontrollably.
The monitor isn’t receiving a synchronization signal. The usual cause of this is
plugging a color-signal fiber into the wrong port on an Extender unit (the red
strand into the green port and vice versa, for example).
Problem: My keyboard, mouse, and printer don’t work.
Fiber 1 and fiber 2 might be loose or connected backwards at one of the Extender
units. They might also be broken—at the remote site, can you see a small red dot
when you hold each fiber connector up to a white sheet of paper? Is the fiber the
right type (50/125-µm or 62.5/125-µm gradient-index multimode)?
Problem: My mouse works but my keyboard doesn’t.
The keyboard probably needs more current than the power supply can provide.
Attach a keyboard whose power consumption does not exceed 100 mA.