Atari 2600 Field Service Manual

Snowy Screen Troubleshooting Procedure,
Switchboard
IS +5v present
at 3101 pin 1
on the switchboard?
Pg. 4-19
I
Is +5v at the RF
modulator pin 3
(5 pin mod)
or pin 2 (3 pin mod)?
RF module output
is tuned to 6 1.23
MHz. ( 2 -15 MHz).
r-= I
t
Check for and
Does RF modulator No
repair opens be-
pin 1 have con-
RF module pin 1
tinuity to ground?
and 3101 pins 6
J L and 10 (ground).
If tbere is still .
a white screen, check
the JlO2 connector.
Replace as required.
A
Open between A10 1
pin 3 and RF
module pin 3-
-
If no modulation,
the RF module is
bad. Replace.
r I
4
Repair
Yes
*
I
Is there modulation?
A
-
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