Atari 2600 Field Service Manual page 54

Snowy
Screen
troubleshoot in^
Procedure,
Motherboard
I
Use swapout
Bad switchboard.
procedure to
.
identify which
board is bad.
Pg.
4-18
Bad motherboard.
I
Yes
1 s +5v present
at J2Ol Pin I ?
i
Pg. 4-12
L 4
J
No
I s modulation
Y e s
I s there continuity
Replice 520 1.
across 5201 pin 2?
evident on
the
TV
screen?
i
A
Yes
No
I s
+7.5-9.0~
present a t 3204
(the power jack)?
Check at bottom
of board
*
Replace J204.
4
1
2600/2600A Domestic V C S
No
Yes
I
I s
3204
OK?
0
pg.4-ll
0
-
Pg. 4-1 1
r)
I
4
I I
Check for open
trace line
between
J204 and J201.
7
Repair
d
I
M
t
b
Yes Voltage shorted
to ground.