Atari 2600 Field Service Manual page 102

2600A Bad Video Troubleshooting (Loss of Sync.)
(Revisions 1 4 and up)
Tune R F module.
I
b
T
b
3.5-5V P-P signal
Yes
D e f e c t i v e
R217
or
'
on A201 side of R217.
d e f e c t i v e
CR203.
or d e f e c t i v e A20 1.
d
R F module tuned to N o Can R F module b e No
6 1.25 MHz, Channel 3
; ' '
properly tuned? Replace
R F
module.
I
Swapout
1) A201
2) A200
3) A202
-
Good video:
+
Yes
Defective
R221 o r R23(
Yes
- ,
2600/2600A Domestic V C S