Atari 2600 Field Service Manual

Defective 1/0 Lines Troubleshooting Procedure
De (ermine
which lines are
defective
by
referring to
. Check the lines
indicated as
defective for +Sv
at 3202 or 3203
(See chart).
Uefect~ve
202 Cap. Connector
(RAIM)L~~~No.
No. PinNo.
15 C235 3202-Pin u
14 C234 3202-Pin 3
I3 C233 3202-Pin 2
I*H-h berwecn AM2 pin
(A2021 pin. Is +5v
prtxnt there? and the 3203D203.
I b
1-k (~hcd< trace lined.
I
Is +5v now Yes
present at the
I
. I
Swapout
I) A202
2) A200
3) A201
-
J
Is +5v present
on the linds)
just checked?
I
Check trace linds)
from defective pin(s)
for rhora to ground.
Are there any shorn?
I
A202 pin?
1
Replace the
capacitor on
that line (see chard.
I
Does Diagnostic
Matrix now look
cwrtct (See
Figure 4-6 or 4-7)?
Yes
-
Does the Diagnostic Swapout
Matrix screen now 1) A200
ook correct (see Fig. b-6)
2) A201
A L
Yes
-
l Yes
2600/2600A Domestic VC5
Repair
I

Atari 2600 Specifications

General

Manufacturer	Atari, Inc.
Release Date	September 11, 1977
CPU	MOS Technology 6507
CPU Speed	1.19 MHz
RAM	128 bytes
Graphics	Television Interface Adaptor (TIA)
Media	ROM cartridge
Successor	Atari 5200
Colors	128
Sound	2 channels
ROM	4 KB
Controller Input	Joystick