Atari CX - Page 137

CURSOR LEFT/RIGHT TROUBLESHOOTING
( Yes
Is unit being supplied
with
+SVDC?
- - ---
Does TP5 toggle low
(OV) when the ball is
moved to right
and high
(5V) when the ball is
moved
to the left?
No , Replace game cable
I Yes
E Return to beginning
of Test Sequence
I
i
Are there 5V square
Replace
A2
waves at TP1 and TP2
when the ball is spun?
I
b w
Does an inverted TP7
IS mere 3 v UL at
signal appear at pin
pin 3 of A3?
Yes
is spun right
and at
Page 7-17
pin 4 of A4 when the
ball is spun left?
Swapout
A3.
Is TP7 low when the
ball is not in
motion?
Is there
a 5V square
J
wave at TP7 when the
Is there
a 5V
ball is spun? No squarewaveatpin
(Duty cycle will
L I
4 of A3 when the
vary with
bail . ball is spun?
Return to beginning of
Test Sequence
No
I
I
CX5200 Field Service Manual
Replace A3.
b
speed), I
Page 7-1 7
I Yes
, Check C5 and R5.
Replace defective
components,
I I
I Yes
L
I
Replace A4.
II
Is there a square
wave at TP7?
,yo
I