Atari CX 5200 Field Service Manual page 145

CURSOR UP/OOWN TROUBLESHOOTING (Cont.)
L
Page 7-22
Use D igital Volt Meter
to check for open trace
or Defective R 1 1 , R 1 9
Repair or Replace
CX5200 Field Service Manual
DX
Does an inverted TP8
. signal appear at pin
1 1 of A4 when the
ball is spun up and
at pin 1 0 of. A4
when the ball is
spun down?
Yes
Does a TP8 signal
appear at pin 4 of
A5 when the ball is
spun up?
Is there' a ramp wave­
No
form ( approx. 3V) at
T P 1 0 when the ball is
. not in
motin'1?
, _
Yes
Does the T P 1 0 ramp
amplitude decrease
w hen ball is spun
No
down?
Yes
Does the TP 1 0 ramp
amplitude increase
when ball is spun
up?
Yes
The problem is not
i n the trakball. The
problem may be in the
Model 5200 console.
7-20
No
Replace A4.
N o
Replace A5.
N o U se Volt Meter
to chec for open trace
or defective R l 2, R20.
Repair or Replace
Return to begirming
o f Test Sequence