Atari 800 Field Service Manual

800 POWER-UP
CATASTROPHIC
FAILURES
AND
SASIC OPERATIONS
SNOWY
SCREEN
Is ths screen snowy
YES
Go to BLACK/GREY
SCREEN, Page,
7-4
NO
Repair
Ji£S_
Is a clear MEMO PAD
on the screen
MO
YES
Go to POWER-UP,
PART
II, Page 7-8
Check,
adjust, or
replace
AC
power
adaptor , channel
select switch
and
TV
switch
box
la
a
clear
MEMO PAD
on the
screen
NO
Doee Power
Supply
Board. J201.
Pin 17.
have *5v
YES
Is
there
a good
ground
connection
at
Pin I of RF Module
YES
Is the RF Module
mistuned
or defective
YES
NO
NO
Go to Slack/Gray
Screen, Page
7-4
Go to
POWER-UP,
PART
IX,
Page
7-8
Check, repair,
or
replace
the following:
CR206-CR209.
replace
1N4001 type
diodes
with
1N5391
CC0I7988)
Does voltage
reg-
ulator
(A20Z) have
t-Sv
Check C208, C209,
R203,
and S202
-
replace if defective
Is
a
clear
MEMO
in
the
screen
PAD
prns
NO
Return
to
START
this
page
ATARI
Home
Computer
7-3

Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS