Atari 2600 Field Service Manual

Colored Screen Troubleshooting Procedure
Switchboard
Bad Switchboard
=?
Is +5v at JlOl
Pin I?
Pg. 4-17
4
Is RF mod. output
Tune RF mod.
If RF mod cannot be
tuned to 61.25 MHz No at adjustment tuned to 61.25 MHz,
(channel 3,+ .I5 hole.
replace it.
MHz)
B
b
Is video
signal pre-
sent at JlOl
pin 12?
Check for open trace
or bad connection be-
tween J2Ol and RF
module pin.
Repair,
Chdc for shorted trace.
If none is found, the
RF module is shorted
and must be replaced.
I
Pg. 4-2
Is JlOl pin
12 shorted to
ground?
P
2600/2600A Domestic VCS
I
. No
~efective 3101.
Replace

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