Atari CX - Page 84

BLACK SCREEN TROUBLESHO(M1NG (continued)
Gnd
-
8
1,21
1
3
8
1
12
8
8
8
7
7
8
8
16
16
16
16
16
16
16
16
7
I Yes
1
Is there +5V to ail
chips? (See chart)
1 Yes
i
i
A
N~
I
Is Pin 40 of A2 at 5V?
Swapout
1) A2
2) A3
3) A5
4) A8
5) A7
Repair open between
chip & +5 or ground.
(Check
for bad socket)
1
Repair
Replace
1
b
Is Pin 36 of A3 at 5V?
Note: Some 5200 2-port boards have pins 1,8,9,10 and 11
of A7 jurnpered together on the solder side of the
PCB. Future PCB's will incorporate this jumper.
Do not add these jumpers to the 5200 2-port board.
-
No
CX5200 Field Service Manual
Defective A1 or other
reset circuitry connect-
ed to A2 pin 40.
b
Yes
No
Open Pin 36 of A3 to
Pin 40 of A2.
-