Troubleshooting – Black Box AC506A User Manual
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4x1 Compact VGA Switch
9
active? (y/n)" You must answer this question with a "y" or a "n". Any 
other input will result in this question being repeated. 
Pressing "b" will blank all output from the AC506A until the un-blank 
command is received. 
Pressing "u" will un-blank the output from the AC506A if it was 
previously blanked. 
Pressing "p" will allow the user to input the priorities of each VGA input. 
The user will be shown what the priority of each VGA input is and then 
given the opportunity to change the priority. Priority can range from 1 to 
4, 1 being the highest priority and 4 being the lowest priority. The user can 
also press enter and the existing priority will be kept. The existing priority 
will also be kept if the user enters a "0". 
Pressing "r" will reset the AC506A with the factory defaults. The factory 
defaults are Normal Mode, all priorities are 1, and the time interval 
between scanning is 5 seconds. 
4. Troubleshooting
1. Fuzzy, blurry, or ghosting image 
 
The VGA cables must be of high quality multi-coaxial construction. If you 
are using long video cables in excess of 100 feet, the losses in the cable 
could be a contributing factor, in which case, first reduce the refresh rate 
to 60 HZ and if that is not enough, you may have to reduce the resolution 
of the incoming video signal. 
2. The PC does not recognize a Plug-and-Play monitor 
 
If the PC’s Operating System is setup to detect a plug-and-play monitor 
(usually in Display Properties Advanced Settings), it may have trouble 
finding a monitor. If the PC does not produce an image due to this, disable 
the plug-and-play monitor detection in the PC’s operating system Display 
Properties. 
3. Substituting power supplies 
 
The AC506A relies on the power adapter that it comes with. Do not 
substitute any other power supply or DC power source.