Atari CX 5200 Field Service Manual page 102

TRIGGER LINE (BOTTOM FIRE BUTTON) TROUBLESHOOTING
(See Chart Below)
Defective:
1) A5
Socket of A5
2)
Cap on that line
3)
CX5200 F ield Service Manual
Is the A5 pin for the
defective port at +5
volts with everything
unplugged from the port?
(see chart below)
Plug in controller.
No
Is pin still at +5V?
Push and hold
bottom fire button.
Does signal drop to
approxima tely
volt?
0-1
Defective A5.
Repair
or
Port
Replace
Note: Some 5200 2-port boards have pins 1 .8.9.10 and 1 1
4 A- 1 8
Defective controller.
Is tr igR er line
Check R l l 4 or R1 l 7
for open.
Yes
M Pin #
Cap #
1
8
C 1 l 2
2
9
CI07
of A7 jumpered together on the solder side of the
will
PCB. Future PCB's incorporate this jumper.
Do
not add these jumpers to the 5200 2-port board.
#
Res
R 1 l 4
R 1 l 7