Adjustment Procedures
Adjustment Procedures
5Ć22
H
Adjust R482 until the background raster lines in the 5% lumi-
nance patch (see Figure 5-15) disappear while the lines in the
10% luminance patch are visible.
4.
Adjust the display contrast:
a.
Display the White Box test pattern:
H
Press the center main-menu button to display the main-menu.
H
Press the main-menu button Tests.
H
Repeatedly press the side-menu button –more– until White Box
appears in the side menu. Push White Box.
H
Press the main-menu button EXECUTE. Then press the side-me-
nu button Ok Confirm Run Test.
10% Patch
5% Patch
Figure 5-15: Five and Ten Percent Luminance Patches
b.
Make the contrast adjustment:
H
Locate R483 (VID. GAIN) on the A26 Monitor assembly (see
Figure 5-14).
H
Monitor the luminance at center screen using a J16 photometer
and a luminance probe.
H
Adjust R483 (VID. GAIN) for a reading of 100 foot-lamberts
(343 candelas).
H
If R483 needed a large adjustment, perform the brightness ad-
justment again.
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Страница 237: ...Troubleshooting Maintenance 6Ć90 J7 Pin 1 J8 Pin 1 J6 Pin 1 W1 Pin 1 W2 Pin 1 Figure 6 46 A01 Backplane Module ...
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