Atari CX 5200 Field Service Manual page 76

Defective:
I
1 ) U5
See chart.
2) U 5 Socket
I
3) Cap on tha t line.
5200
e x F ield
Trigger Line Troub leshooting
B6tto m F ire Button
Is the U5 pin for the
defective Port at +5
volts with everything
unplugged from the Port?
Plug in controller.
Is pin still at +5V?
Yes
Push and hold
botto m fire button.
Does signal drop to
approximately
0-.7 volts?
Yes
Defective U5
Repair
or
Replace
Service Manual
No
D efective controller.
Is tr igger line
N o
shorted to +5V?
Yes
Port Pin
U5
1
8
9
2
1 0
3
1 1
4
***NOTE** *
If y o u are servicing a unit containing
PCB CA020 10 8 , chip designators have
been changed from U to A.
4 - 1 9
II Cap /I
1 1 0
1 09
108
1 07