Atari CX - Page 78

Keyboard Troubleshooting (cont.)
Swapout
1) UlO
2) u12
Does Port
4 pass?
17
I Check capacitors Y I
I resistors on Pins 1-8 1
of Port 4. Replace if
defective.
If you are servicing a unit containing
PCB CA020 108, chip designators have
Seen changed from U to 4.
CX5200 Field Service Manual