Atari CX 5200 Field Service Manual page 100

No
Is pullup resistor
Repair'
good?
Line #
L M 1 *
LM2
L M 3
* The 1 . 1
CX5200 Field Service Manual
GRA Y BARS TROUBLESHOOTING
Manually set the
5200 to the Gray Bars
Is there a +5Y p-p
signal on the side of
R26, R2�,
nected to A 1 ?
Reference the line
on the chart below
which has the resistor
that did not have the
Is there a +5Y p-p
signal on the A l
output pin?
Is there a +5Y p-p
signal on the
input pin?
Is there a +5V p-p
signal on the A5 pin?
Yes
Swapout
1 ) A5
2) A2
3) A3
#
Al Output
Resistor
R 2 �
R 25
R 2
6
Diagnostic
Cartridge
4 A- l 6
N
pattern.
Yes
R25 con-
&:
No
proper signal.
Yes
� o
Yes
A l
No
Yes
F
Al Input
6 7
1 1
1 2
1 0 9
does not test
L M O .
Defective R26,R2�
R25 or open between
R26,R2�, or R25 and
R.F. Module Pin �.
Open between A 1
output and that
resistor.
Defective or no
Al
+5V or ground to
A i .
Open between A5 pin
and input.
Al
Repair
or
Replace
Pullup #
#
A5 Pin
R 1 9
22
R20
23
R21 2 �