Atari 800

800 ANY
VIDEO
TROUBLESHOOTING
(cont)
Verify
that each
of the
foUowing
levels
and/or
signal wave
forma
exist
before
proceeding
to
the
next step.
Use
SALT II,
COLOR
BARS,
locked
into the
continxious
mode.
Is
than
3.38MHz
NO
Swap-out
XIOI.
Q102
and
QI03
oscillation
at R106
on
Motherboard
Kmfmr
Tigure
NO
YES
Is there
input
signal
to
base of
Q109. Ptn
2 Refer
Figure
Trace
circuit
bacic to
previous
step
NO
YES
la there
output
signal
from
emitter
of
OI05 Refer
Flgiire
Trace
circmt
back ro
MO
previous step
|
YES
Is there
signal
at
JUS,
Pin 20
Refer Figure
Trace
circuit
back
YES
Go to
next page
|
ATARI
Home
Computer
7-20