Acer AL1521 Manual Do Utilizador

41L1500-786-1A 英文 

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 right, the screen will show vertical 
stripes and the picture will not have the right width. 
 
FOCUS adjusts the phase of the pixel clock signal. With a wrong phase 
adjustment the picture has horizontal disturbances on light pictures. 
 
For FOCUS and CLOCK adjustment use “dot-pattern” or win 95/98 shut-down 
mode pattern.