Apple 5420/180 Benutzerhandbuch
Adjustments
Video - 32
and green bias (VR305)
controls to neutralize
the four darkest bars.
3 If the screen shows a
predominant blue color,
start by adjusting the
green bias control
(VR305) until the blue
color is neutralized
with green and it’s
difficult to tell whether
the four darkest bars are
blue or green.
4 Adjust the red bias
control (VR304) until
the bars appear to be
shades of gray.
VR305 VR304
CRT Video Board
Run
Display Service
Utility
Gray Bars
Test Pattern