Atari 2600 Field Service Manual page 81

Figure 4-4. Gray Bars Screen
The gray bars screen h a s e i g h t horizontal shaded bars.
I t is normal for t h e bars t o
have some uneven a r e a s on their upper and lower edges.
The
bars must appear (in
descending order) a s going f r o m black t o white in even steps. The s c r e e n may
not
have
a n y color in it. All e i g h t b a r s must b e consistent in their shade across t h e e n t i r e bar.
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lhe a r e a of t h e screen outside t h e bars is irrelevant.
The white line immediately
a b o v e t h e top bar (black) is normal. This screen tests t h e operation of t h e chip set,
especially t h e TIA (A202).
2500/2600A
Domestic VCS
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