Atari 2600 Field Service Manual page 121

2600A Audio Troubleshooting
k RF
module tuned to
61.25 MHz?
(Channel
3)
I s there a 2v p p square
wave that alternates
between
nvo frequencies
on pin 13 of A201?
Is
there a 4.5
M H z ,
Does quare wave S ~ J M ~
appear at C208?
signal
at C211 (either side)
N
Fix open trace line
betwtcn C208 and
Pin 12/13 of AZO1.
rn
Pg. 6-2
1
i #
Yes
-
ye,
Is only
one
audio
-
tone present?
Yes
Replace
1) a i l
2) R207
Repair
I s
there a defective A20 1
or open A201
pin 12 and
A201 pin 13?
J
I
I s there now an
alternating audio tone
from the
TV?
2600/2600A Domestic V C S