Atari 2600 Field Service Manual page 62

Snowy Screen Troubleshooting Procedure,
Switchboard, (Continued)
I
I s +5v a t the
output of the voltage
regulator (A101, pin 3)?
I
Is unregulated
47.5-9v a t voltage
regulator input
(A101, Pin l)?
Check
for
bad regulator
(AlOl)
or
open
between ground
and A101.
I
-7.5-9v present
yes
RephCe SiOl.
-
on the 3101 side of
I
D o e s " r h
2 have
continuity?
(
Yes
I
I s JlOl pin 2
shorted
to ground?
l$l
Replace
5 10 1.
Check that C103 or C106
have not shorted t o
ground.
u
i t r e ( )
I s there modulation?
0
Pg. 4-2
2600/2600A Domestic V C S