Atari 2600 Field Service Manual page 112

2600A Gray Bars Troubleshooting Procedures
(Xevisions
1 4 and
up)
'(
R214, R15, and
signal on the A20 1
K L ~
d
with meter for
a
I
s i d e o f R 2 1 0 , R 2 1 5 , correct value.
n
- - I - c e any defective
and ~ 2 1 6 ?
components.
a
Open between A201
Is there
3-5v
P-P
Repair
-
and that resistor or
signal on the A20 1 defective Cii202
;
pin corresponding to I
if
L. M 1 is bad.
1
the resistor that had
I
no signal?
u
Check pullup
resistors
R218, R219,
or
R229
on that line t o insure
resistor is good and
one side is connected
to +5V.
J
Resistor
Yes
Defective?
I I
Replace
Pg.
4-45
Pg.
6-2
2600/2600A D o m e s t i c V