Atari 400

400 GREY
BAR
TROUBLESHOOTING
Swap-out
A301 and
A302.
on CPU Board
YES
Doas
screvn look
like
FIgun
3-6
Go
to
ANY
VIDEO,
Page 5-18
YES
NO
Swap
CPU Board
Ooos
9cr««n look
Uk« Figure
3-6
Trace color
circuitry
on CPU Board.
Make
cetain to
check
color delay
circuit
and R309
YES
NO
Swap-out
Alll.
Q107
on Motherboard
Does screen look
like Figure
3-6
Go
to ANY
VIDEO,
Paye
5-18
NO
Go to next page
ATARI
Home
Computer
5-15