Atari 2600 Field Service Manual page 69

D e f e c t i v e 1 / 0 Lines Troubleshooting Procedure
De
(ermine
which lines a r e
defective
by
referring to
.
Check the
lines
indicated as
defective for
+Sv
a t 3202 or 3203
(See chart).
U e f e c t ~ v e 2 0 2
Cap.
Connector
( R A I M ) L ~ ~ ~ N o .
No.
PinNo.
15 C235 3202-Pin
u
14
C234 3202-Pin 3
I3 C233 3202-Pin 2
I * H - h
berwecn
A M 2 pin
(A2021 pin. I s +5v
p r t x n t there? and the 3203D203.
I
b
1 - k
( ~ h c d <
trace
lined.
I
Is +5v
now Yes
present
a t t h e
I
.
I
Swapout
I ) A202
2 ) A200
3) A201
-
J
Is +5v present
on
the
linds)
just checked?
I
Check trace l i n d s )
from defective pin(s)
for rhora t o
ground.
Are there any shorn?
I
A202 pin?
1
Replace the
capacitor on
that line
(see
chard.
I
Does Diagnostic
Matrix now look
cwrtct
(See
Figure
4-6 or 4-7)?
Yes
-
Does the Diagnostic Swapout
Matrix screen now 1) A200
ook correct
(see
Fig.
b-6)
2) A201
A L
Yes
-
l
Yes
2600/2600A Domestic VC5
Repair
I