Atari CX 5200 Field Service Manual page 146

CURSOR UP/DOWN TROUBLESHOOTING (Cont.)
H
Is the slightly rounded
square wave at pin 9
No
Replace U 1 .
pin 1 1 of A l mini-
eX
mum o f 450 MV p-p?
( M axi m um . 2.5V)
Yes
No
Is C 1 0 shorted o r
Is there approx. No
Replace AI.
are R30, R3 1 o pen?
4 00 MV at pins 8
eX
1 0 of A I ?
Yes
Yes
R eplace defective
S wapout
component.
1 ) A l
X
Return to beginning of Test Sequence
7-21
CX5200 Field Service M an ual