TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
a.
V Stripe.
(1) Set the oscilloscope sweep speed to 10 usec per division
(2) Connect oscilloscope external sync to the H drive source
(3) Set the function selector on V STRIPE and pattern switch to WHITE.
(4) Connect oscilloscope channel 1 input to the video G output connector at the rear panel.
(5) Compare oscilloscope display to figure 6-7a.
(6) The adjustment range allows the V stripe to be shifted and adjusted in size as desired from left to right to
extremes which will cut off part of the pattern on the left, and in the right to an extreme which will cause
the V stripe to be developed in every other line, resulting in a striped flickering effect rather than the
normal display. This pattern should be adjusted so that the entire V stripe is shown in the center area of
the raster. Refer to figure 6-7a.
(7)
Adjust left margin 25% of the active line time (10.6 usec +0.1 usec at the 675-line rate) using the H
position control 38 located on the H WINDOW card (figure 6-18).
(8) The H width control should vary the horizontal width of the V stripe from approximately 7.0 usec at
minimum range to 39 used at maximum range. Adjust the horizontal spacing of the V stripe to 50% of
active line time (21.2 usec +0.1 usec at 675-line rate) using the H width control R39 located on the H
WINDOW card.
(9) The width of the right margin should be the same as the left margin, 25% of the active line time (10.6
usec +0.1 usec).
(10) Set pattern switch to BLACK and compare to figure 6-19a. Return pattern switch to WHITE.
(11) Observe the video portion of the signal while turning the VIDEO LEVEL control from 0 to 10. Video
amplitude should vary from 0.0v to 1.0v peak-to-peak +0.10v. The sync and blanking portions of the
composite video signal should remain at the levels set in signal level adjustments (paragraph 6-38).
(12) Connect the video G output connector to the monitor input to display the V stripe pattern. Check that
when the pattern control is set on WHITE, a white stripe covering 50% of the width of the raster is
obtained at the center of the raster, and when the pattern control is on BLACK, a black stripe of the
same proportion is obtained
6-47
