TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
Table 6-1. Troubleshooting (Continued)
Trouble
Probable Cause
Remedy
9.
Blanking waveform
Drive/blanking circuit card
Replace drive/blanking
is abnormal, but
circuit card
amplitude correct
10.
Sync waveform
Sync circuit card
Replace sync circuit card
incorrect in format
and timing, but
amplitude is correct
11.
Video level control
Gray scale control
Replace gray scale
voltage low
circuit card
control circuit card
12.
White and black
Polarity circuit card
Replace polarity circuit card
patterns for:
window, bar, dot,
V bar, H bar,
H stripe and
V stripe are
abnormal
13.
Bar, dot, H bar
a.
H bar circuit card
Replace H bar circuit card
or V bar
b.
V bar circuit card
Replace V bar circuit card
function abnormal
14.
Resolution function abnormal
a.
Multiburst circuit card
Replace multiburst
circuit card
b.
Resolution circuit
Replace resolution
card (10)
circuit card (10)
c.
Multiburst clock
Replace multiburst
circuit card
clock circuit card
NOTE
The resolution cards are emitter-coupled to the video card. A problem on a
resolution card may force video to black level resulting in an apparent loss of video
while sync and blanking remain at the output. Check for this possibility by
removing all ten resolution cards. Other generator functions should operate
normally. If the problem was verified, select the multiburst function, then install
the resolution cards, one at a time, until the problem occurs. The last resolution
card installed is the source of the problem.
6-4
