Atari 2600 Field Service Manual page 116

2600A Defective Matrix Troubleshooting Procedure
?artern
LS
disrupted
if blue or
black lines
are missing
or some
portmn of the Mauix
faiis
TO
appear
on
the
TV
screen.
The panern may
i a v e
errors,
but all nine bloc~s are
xesent
on screen.
4
1
I s blue black grid panern
Swapout
Yes
dhrupfed? (See Figure 1) A200
k entire mauix
b 8 for example
bad
2)
A202
now on screen?
pattern) 3) A20
1
d
b
4
1
i
1
Yo
Is upper Left block on
screen defective?
( S e t Figure 4-6 or 4-7
ior correct oartern)
Pg. 6-22
0
Pg.
4-45
I s upper-m iddle
b b c k defecrive?
Pg. 6-23
6
Pg.
6-22
Swapour
Yes
1s middle-middle 1) A200
-
[S
middle-middle
block aefecrive? 21 A202 block now OK?
3) A201
a
J
I
k
lower-middle
block defective?
Pg. w 5
Pg. 6-13
2600/2600A Domestic VCS