Apple Mac 5260/100 - Manual (Page 210)

5260 and 5280 Adjustments Video - 27
16 If the screen shows a
predominant blue color,
adjust the Green Drive
Control (R531) until
the blue color is
neutralized.
17 Adjust the Red Drive
Control (R501) until
the bars appear to be
shades of gray.
Run
Display Service
Utility
R501 Red Drive
Control
R531 Green Drive
Control
(Drivers Located
Inside Analog Board)
Gray Bars
Test Pattern