724-746-5500 | blackbox.com
Page 36
724-746-5500 | blackbox.com
Chapter 4: Service Setup
4.4 Setup Instructions for VGA Input (ACS4011A-R2 Family)When converting from analog to digital signal, this extender will give you options to adjust and compensate in order to achieve
the best possible video output. This procedure is designed to correct discrepancies in the video signal from analog/digital video
conversion by the VGA to DVI Converter.
1. Display from your graphics source a picture with as much detail as possible. If possible, display a “burst-pattern“ (see Figure
4-21)—a picture with alternating, 1-pixel wide, black-and-white, vertical stripes.
If you are unable to view the test card, display some black text on a white background. For example, you could open Notepad,
maximize it to full screen, and fill the page with letter ‘I’s in a 12-pt. sans serif font. Proceed with Step 2.
2. Display the OSD.
3. Select the Image menu option:
4. Select the first command icon:
Automatic detection of number of pixels per line and the best phase.
5. Assess the desktop test pattern. If the vertical stripes are sharp and without jitter or smearing, the adjustment has been
successful. Go to Step 9.
6. If the picture quality is not acceptable after the automatic adjustment, you will have to manually adjust the pixel clock and pixel
phase (in this order).
7. With a poorly adjusted pixel clock you may see one or more vertical areas, where the lines are smeared:
Figure 4-21. If, after allowing the OSD to automatically adjust the pixel phase, the picture quality is not successful, you may
see this type of distortion. In this case, you will need to manually adjust both the pixel clock and pixel phase.
a. Return to the OSD utility and select this menu command:
Manually adjust the number of pixels per line (pixel clock) from the Image menu.
b. Adjust the pixel clock value until all stripes have disappeared.
c. Confirm the setting.
ACS4002A-R2