Atari CX - Page 72

Trigger Line Troubleshooting
Bottom' Fire Button
2) US Socket See chart*
3) Cap on that line.
Is the
US pin for the
defective Port at
+5
volts with everything
unplugged from the Port?
Plug in controller.
u
Push and hold
bottom fire button.
-
Is pin still at +5V?
I
I Yes
I
Defective controller.
I
Defective U5
0
-
Yes
No
Does signal drop to '
approximately
0-.7 volts?
CX 5200 Field Service Manual
I
Is trigger line
shorted to
+5V?
Port U5 Pin # Cap #
i
If you are servicing a unit containing
PCB CA020 108, chip designators have
been changed from
U to A.