COLOR
BAR
TEST
Purpose: To
test
the
6507
microprocessor,
6532
RAM
-
1/0
chip,
and
TIA
chip for correct operation.
a
Format: Set all switches to initialization position.
A
screen of horizontal
color bars is displayed (See Figure
3-81.
The screen should be steady
and
unchanging.
A
gray
or blue horizontal reference line runs across
the
screen
about three bars from its bottom. This reference line is thinner than the
bars around it.
R211
(R213
on the 2600A board) should be adjusted
so
the
bars immediately above and below the reference line are within one
shade
of each other. Proper operation of the unit
is
indicated
by
being able to
make
this adjustment and
by
consistent color within the entire span of each
bar on the screen. Minor glitches on
the
edges of the color bars are
acceptable.
Leave
this test on for
at
least ten seconds in order to catch
any
intermittent problems, such
as
a
bar momentarily changing colors or
blanking out.
NOTE:
This
figure
is
a
black
and
white
representation
of
a
color
television
screen.
Figure
3-8.
Color Bars Screen
2600/2600A
Domestic
VCS
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