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Atari CX - Page 55

Atari CX
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Black
Screen
Troubleshooting
I
output
of
VRl?
4
I
Yes
w
Pg.
4-4
#
Is
there
a
1.78975
MHz
Yes
Is
there
a
1.78975
signal
on
Pin
29
of
U3?
'
MHz
signal on
Pin
30
of
US?
b
I
k
I
No
No
I
Is
there
a
3.5795
MHz
signal on Pin 28
of
U5?
I
pg.
4-3
Open between
U2
Pin
37
and
U3
Pin
34.
No
Swapout
1) U5
2)
U3
w
b
Open between
US
Pin
29
&
U3
Pin
35.
I
No
Is
there
a
1.78975
MHz
signal
on
Pin
37
of
U2?
d
I
Yes
I
Yes
J
Is
there
a
1.78975
MHz
No
Swapout
signal
on
Pin
34
of
U3?
1)
U3
2)
U2
m
I
I
m
Repair
or
Replace
0
Page
4-5
*
t
*+*NOTE"++
If
you
are servicing
a
unit containing
PCB
CA020
108,
chip
designators have
been changed
from
U
to
A.
I
I
CX52C)O
Field Service Manual
No
No
Is
there
a
3.57950
MHz
signal on Pin
29
of
U5?
is
there
a 3.57950
MHz
signal
on
Pin 35
of
U3?

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