Acer al1722 Guía Del Usuario

14

 
Screen image is not centered or sized 
properly. 

*Adjust pixel frequency (CLOCK) and 

FOCUS or press hot-key (AUTO)  

Picture has color defects 
(white does not look white) 

*Adjust RGB color or select color 

temperature 

Horizontal or vertical disturbances on 
the screen 

*Use win 95/98 shut-down mode 

Adjust CLOCK and FOCUS or 
perform hot- key (AUTO-key). 

 
CLOCK (pixel frequency) controls the number of pixels scanned by one 
horizontal sweep. If the frequency is not correct, the screen shows vertical 
stripes and the picture has not correct width. 
 
FOCUS adjusts the phase of the pixel clock signal. With a wrong phase 
adjustment the picture has horizontal disturbances in light picture. 
 
For FOCUS and CLOCK adjustment use “dot-pattern” or win 95/98 shut-down 
mode pattern.