Atari 2600 Field Service Manual page 86

Figure 4-9. Audio Tone Test Screens
The test displays two alternating patterns on the screen (as shown in Figure
4-9) w h i l e
two alternating tones a r e heard. The tones change in sync with the
screen. This test
pattern continues for one full cycle a f t e r t h e Right Difficulty switch has
been
switched to stop t h e test.
2600/2600A
Domestic
V C S