Atari CX 5200 Field Service Manual page 63

Black Screen Troubleshooting (Cont.)
PCB /I
00 "-
00
s
a
00
0
N
0
0
« «
u u
Gnd
·5
Ui I
Al
U2 8 1,21
A2
1
U3 21
.-\3
10
U4 20
27 )
U5
"5
16 8
U6
.-\6
1
U7 17
-\7
.
US 24 12
A8
16 3
LJ9
.-\9
Ul0
3
16
i\ 1 Q
Ull
. -\ ll
16 3
U12 16 3
.-\12
S
UlJ 16
. -\ 13
U14 14 7
, " 14
10
U15 20
A16
16 8
U16
16
8
U17
."17
Al&
16
U18 8
U19 8 16
.' \ l9
UZO S 16
AZO
UZI 8 16
AZI
8 16
AZ2 U22
16
U23 8
AZ3
& 16
U24
AZ4
&
16
.' \ 25 U25
used
U26 Not
7
U27 14
A27
14 7
U28
U29 14 7
14 7
A15
14 7
A26
CX5200 Field Service Manual
B
3
Is there 5V to all
+
chips? (See chart)
Yes
Is Pin 40 of U2 at 5V?
Yes
Is Pin 36 of U3 at 5V?
Yes
Swapout
U2
1)
2) U3
3) U5
4) U8
5) U7
Is problem repaired?
No
Page 4-7
4-6
Repair open between
No
chip 5 or
&:
(Check for bad socket) +
Defective U
No
Reset circuitry
connected to U2 Pin 40 .
No
Open Pin 36 of U2 to
Pin 40 of U5.
Yes
** *NOTE***
I f you are servicing a unit containing
PCB CA020108, chip designators have
been changed from U to A.
ground.
or other
1
R epair
or
Repla ce