Atari CX - Page 64

Snowy Screen Troubleshooting (cont.)
I
* 5--
Does Pin 11 of ~29(~26)* 2 1s pin LO of U29(A26) at
Replace QI
0 Doesunitwork? 2
toggle each time 52 OV? L
is pressed?
I
Does Pin 6 of ~29(~26)*~o
high when 52 is pressed
and low when it
is
released?
Is there continuity
No '
between Pin 9 & 12
-
Repair trace.
of
~29(~26)*
I
Replace U29(A26)
*
shorts or opens on
the failing pin or
defective
52.
Repair
n
*U29 is chip designation
on PCB #CA018087
A26 is chip designation
on PCB #CA020108
CX5200 Field Service Manual
Open trace or
defective resistor
or capacitor in
circuitry.
4
I
Repair or Replace
If you are servicing a unit containing
PCB CA020 108, chip designators have
been changed from
U to A.