TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
6. Observe the video portion of the output composite video 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.
7
Connect the oscilloscope external sync output to the H drive source
8
Set oscilloscope sweep to view horizontal information.
9.
Compare oscilloscope display to figure 6-10a.
10 Connect the video output connector to the monitor input. The flat white pattern should be obtained with no
visible hum or interference.
11. Performance verification of the flat field function is now complete.
6-40. V Bar, H Bar, Bar and Dot Adjustments. The V bar, H bar, bar and dot patterns are related and are derived
from common horizontal and vertical elements. Therefore, adjustment is considered for the total group of patterns. The
circuit cards involved include (see figure FO-21):
V bar.........................................................................................................................
Position 1B
H bar ........................................................................................................................
Position 2B
Polarity .....................................................................................................................
Position 3C
a.
V Bar.
(1) Connect oscilloscope channel 1 input to the video G output connector at the rear panel.
(2) Set oscilloscope sweep rate to 10 usec per division.
(3) Set the oscilloscope channel 1 input amplitude sensitivity at 0.5v per division
(4) Connect the oscilloscope external sync connector to the H drive source.
(5) Set the function selector switch at V BAR.
(6) Compare oscilloscope display to figure 6-11a. Nominal setting is 17 V bar elements for whatever scan
rate is in use.
6-37
