Atari CX - Page 59

Black Screen Troubleshooting (Cont.)
PCB Q
m b
"- g
E 2
2 2
U U
- -
1 U1
.A2 U2
.A3 U3
U c
A5 U5
36 U6
A7 U7
A8 U8
A9 U9
410 1JlO
\I1 till
A12 :JL2
A13 lJ13
A14
U14
U 15
,416 U16
A17 U17
A18 UlS
A19 U19
A20 U2O
A21 U21
A22 U22
A23 U23
,424 U24
A25
U25
U 26
A27 U27
U2S
U 29
A15
A26
Not used
14 7
14 7
I C 7
I4 7
14
7
I
9 L
Repair open between
Is there +5V to all
No
chips? (See chart)
chip
& +5 or ground.
(Check for bad socket)
b
I Yes
I
w
NO Defective U1 or other
Is Pin 40 of U2 at SV?
Reset circuitry , -
connected to U2 Pin 40.
I
( Yes
I Yes
I
Swapout
I) U2
2) U3
3) U5
4)U8 .
5) U7
i
L
1
Repair
or
Rephce
L
I
Is problem repaired? ' yes
No
*+*NOTE**"
Page 4-7
If you are servicing a unit containing
PCB CA020 108, chip designators have
been changed from U to A.
CX5200 Field Service Manual