Adjustment Procedures
5-24
TDS 420A, TDS 430A & TDS 460A Service Manual
10%
Patch
5%
Patch
Figure 5- 12: Five and Ten Percent Luminance Patches
b. Make the contrast adjustment:
H Locate R483 (VID. GAIN) on the A26 Monitor assembly (see
Figure 5--11).
H Monitor the luminance at center screen using a J17 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 adjust-
ment again.
5. Adjust the display focus:
a. Display the Composite 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 -- m o r e -- until Composite
appears in the side menu. P ush Composite.
H Press the main-menu button EXECUTE. Then press the side-menu
button Ok Confirm Run Test.
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