Atari CX 5200 Field Service Manual page 80

Keyboard Troubleshooting (cant.)
CX5200 Field Service Manual
E2
Swapout
1) U9
2) U 1 2
Does Port 2 pass?
No
Check capacitors and
resistors on P ins 1 -8
o f Port 2 for proper
v alue & operation.
R eplace if defective.
If you are servicing a unit containing
P CB CA020 1 08 , chip designators have
been changed from U to A.
4-23
Yes
*"'''' N OTE ''' '' ' *