Atari CX - Page 74

Keyboard Troubleshooting
Is the failure on Port I?
Manually select Pokey
Adjust Test.
J
Are there 5v p-p square No Replace
waves on Pin 9 .& 10 of I
U9-U1 2? U7.
6
Which port failed?
0 Paee 4-24
If you are
+**~O~~***
servicing a unit containing
-0 - -.
PCB CA020 108, chip designators have
heen changed from U to A.
CX5200 Field Service Manual.