Atari 800

400
FOWER-UP
CATASTROPHIC
FAILURES AND
BASIC OPERATIONS
SNOWY
SCREEN
Is tha scre«n
snowy
YES
NO
Go to Slack/ Gray
Screen,
Page 5-4
Check, adjust, or
replace AC
power
aciaptor,
channel
select switch
and
TV switch
box
Is
a clear MEMO
PAD
on the
screen
NO
Does
Power
Supply
Board. J201. Pins
3.
6, and 7,
have
+5v
YES'
NO I
Is
there
a good
ground
connection
at
Pin
1
of RF Module
Repair YES,
Is
a clear
MEMO
PAD
on the
screen
NO
YES
Go to
POWER-UP,
PART
II. Pa^e 5-8
YES
Is the RF Module
mistuned or
defective
NO
Go
to
Black/ Gray
Screen. Page
5-4
YES
I
Go to
POWER-UP:
PART II, Page 5-8
MO Check
.
repair
.
or
replace the
following:
CR206-CR209. replace
IN4001
type
diodes
with IN5391
(C017988)
Does voltage reg-
ulator (A202)
have
+5v
Check
C208.
C209,
R203, and S202
-
replace if
defective
Is a clear
MEMO PAD
on the
screen
NO
YES
ATARI
Home
Computer
5-3