Atari CX - Page 88

BLACK SCREEN TROUBLFcHOOT'WG (Continued)
1
b >
Open Trace RAM
Is there a data signal
No
chip Pin 2 to A2
on Pin 2 of A18-A25?
Repair
or replace
defective RAM
A
1
I
I L
Isthere a data signal No If only one chip is
on Pin
I4 of A1 8-A25?
missing signal, replace
that chip, if not proceed
D
Yes
b
Swapout
'
Yes
1) A14
Does unit function? I
2) A15
I
3) A16 No
4) A17
L
Is there 4V p-p signal
, No
on Pin 9 of Al??
1
L J
b
Replace
display? A17
Is there a 4V p-p
signal
on Pin 4 of
A 1 8-A25?
Defective:
1) A15
2) L4-L6
3) C30-33
4) Open Address
I Repair or Replace I
Is there a good
Swapout
1) A14
2) A15
or open Pin 4
of RAM chip(s) to
Pin 8 of A14
CX5200 Field Service Manual