Atari 1025 Field Service Manual page 61

INCORRECT
ROM
READING
This failure
is
caused by an
incorrect reading
of the
ROM
chip.
To
repair
it
swapout
in this
order:
1)
Q7
2)
QS
3)
Q6
4)
Q5
If
this
does not solve the problem, then there
is
an
open
PQ
line
from
QS
to
Ql.
Repair
it.
Atari 1025 Printer
Field Service
Manual
5-11