Atari CX 5200 Field Service Manual page 108

KEYBOARD TROUBLESHOOTING (Continued)
V
Swapout
1 ) A l O
2 ) Al l
Yes
Does Port 2 pass?
No
Check capacitors and
resistors on Pins 1 & lj.
of Port 2. Replace if
de fective.
lj. A-2lj.
CX5200 Field Service Manual