Specifications

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ACS253A-CT
Chapter 6: Extender Setup
4. Select the Image menu option: .
5. Select the first command icon: Automatic detection of number of pixels per line and the best phase.
6. Assess the desktop test pattern. If the vertical stripes are sharp and without jitter or smearing, the adjustment has been
successful. Go to Step 10.
7. 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).
8. With a poorly adjusted pixel clock, you may see one or more vertical areas, where the lines are smeared (see Figure 6-1 [a]):
a. Return to the OSD utility and select the 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.
9. Problems with the pixel phase will cause horizontal noise, horizontal wave-formed lines, flicker, or smearing with a zebra
pattern (see Figure 6-1 [b]):
a. From the OSD’s Image menu, select the menu command: Manually adjust the best phase (best point for A/D conversion
within each pixel).
b. Modify the phase until all distortions have disappeared.
c. Confirm the setting.
10. If appropriate, reattach your TFT monitor and adjust its image according to the manufacturer’s instructions.
11. Reinstall your preferred desktop background picture.
Figure 6-1. Burst test pattern applied to desktop showing problems with (a) pixel clock setting, (b) pixel phase setting.