Atari 2600 Field Service Manual

Gray Bars Troubleshooting Procedure
Isthere a 3-5v
p-p signai on the
A203 side of R222,
r R223.R224?
I
Do all of pins 2,
12, and 15 on A203
have
a signai present?
Yes
-
Yes
-
Ohm meter. Replace any
failed or of f-value
resistors.
Pg. b45
There is an open line
between
A203 and the
resistors. Fix it.
Pg. 4-5
I
I
m
Check inputs of Yes
A203 (pins 3,11,14). Replace A203.
Does each have a
signal present?
1
I
Do all of pins 5,7,8
on A20 1 have a signal
present?
Check for open
'll linesbetwen A201
and A203. Fix.
I
Pg. b15
Pg. 4-2
2600/2600A Domestic VCS

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