Atari 2600

2600A Gray Bar Troubleshooting Procedure
(Rev isions 1 -1 3)
signal on the A20 1
side of R214, R215,
and R216?
I
fs there 3-5v P-P
signal on the A20 1
pin corresponding to
the resistor that had
I
no signal?
Yes
-
Check pullup resistor
R218, R219, or R220
on that line to insure
resistor
is good and
one side is connected
to +5v.
Check R214, R15, and
R216 with meter for
correct
value.
Replace any defective
yes { Open between A2I 1
Repair
and that resistor.
L
I
P
Resistor
Replace
Defective?
Yes
Pg. 6-2
2600/2600A Domestic VCS