Atari 2600 Field Service Manual page 117

2600A Audio
Test Procedure
Reinitialize switches.
Slide the right
difficulty switch to
the right.
I s there a
clear
tone?
I
Use scope or
frequency counter
to measure frequency
a t emitter of 4201.
I
Tone audio
to 4.5
MHz
by adjusting L2O I.
4
I
I
Ad
just to 2.06
MHz.
Look for stable
frequency
.
I
I
Can unit be
.
-
/-
adjusted
g & is
sound clear?
Pg. 6-24
2600/2600A Domestic VCS