Atari CX - Page 138

CURSOR LEFTIRIGHT TROUBLESHOOTING (Con t.)
Does a TP7 signal
appear at pin
10
of A5 when the ball
is spun left?
4
CX5200 Field Service Manual
L
I
Is there a ramp
J
waveform (approx.
3V) at TP9 when the
ball is not in
Page 7-18 motion.
I Yes
of Test
Sequence
No
.
Replace A5.
Does the TP9 ramp
Use Digital Volt Meter
amplitude decrease
to
check for open trace
4
,he,., the ball is spun
or defective R9 or R17.
to the right?
Return to beginning
Yes
J
J
Does the TP9 ramp No
Use Digital volt Meter
Repair or Replace
amplitude increase
to check
for open trace
when the
ball is spun
or defective R10, R18.
to the left?
.
Yes
The problem is not
Return to beginning
in the trakball. The
of Test Sequence
problem may be in the
Model
5200 console.
Return to beginning
of Test Sequence