Atari 2600 Field Service Manual

Black or Solid Colored Screen Troubleshooting
Use swapout
procedure to
Defective switchboard
identify
which
board is bad.
Pg. 4-16
Defective .Motherboard
I
b J
Is 4-E, p-p
d2 signal Yes
prexnt on
A202 pin 392
Is 4-5v p-0
ox. signal
present betureen
C203 and R203?
Pg. 4-1 0
1) X200
2) Q200
3) 4201
4) Other Clock
Circuit Components
#
I
Is 4-jv p-p
v b -
ox. signai
Opm between
prexnt on
0 C203 and pin 1 I - Reoalr -
pin 11 .4201? A20 1.
I
Is (C-5v p-p
dO signal
Does unit function?
present on
1) A201
pin 4 A201? 2) A200
I
L
Pin Q A201 shorted.
b 4-5v p-p
b
Reoair
do signal No Openbemeen
present on - Pin 27 A200 I
pin 27 A200?
and Pin 4 A20 1.
i b
Yes
I
No Swapout
b 4-5v p-p
Yes
-
1) A200 - Does unit function? -
d2 signal
prexnt
on
2) A202
pin 28 AMO?
Pin 28 A200 is shorted.
b 4-5" &
b
62 signal present N~ Open between
on
A201 pin 26? -
Pin 26 A201 and
Pin 28 AZOO.
L
b
I
Ooen between
Pin 39 A202 and
pin 28 A200.
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