Apple lc 580.performa 580cd Service Manual
Adjustments
Video - 22
leftmost (darkest) bar
remains completely
black.
4 If the screen shows a
predominant color,
start by adjusting the
bias control that will
offset that color.
Otherwise, start with
the GB (green bias)
control.
5 Using a hex-head plastic
adjustment tool,
alternately adjust the RB
(red), GB (green), and
BB (blue) bias controls
until the leftmost bar is
Adjustment
Controls
Gray Bars