Atari CX - Page 143

CURSOR UP/DOWN TROUBLESHOOTING (Cont.)
1 Does an inverted TP8
signal appear at pin
11 of
A4 when the
ball
is spun up and
at pin 10 of.
A4
when the ball is
spun down?
Replace A4.
*
I
1
Does a TP8 signal
appear at pin
4 of No
A5 when the ball
is Replace A5. -
spun up?
J Does the TPlO ramp
Use Digital Volt Meter
amplitude decrease
to check for open trace
'
when ball is spun
J
or Defective R 11, R19
A
No
down?
Repair
or Replace
R
Return to beginning
of Test Sequence
amplitude increase
to che& for open trace
when ball
is spun
or defective
R12, R20.
Does the TPlO ramp
Use
Di ital Volt Meter
amplitude increase
when ball
is spun
I~olto checa for2
up?
I
I
in the trakball. The
problem may be in the
model 5200 console.
I
Repair or
Return to beginniig
of Test Sequence
CX5200 Field Service Manual