EXIDY FIRE ONE Instruction Manual page 9

3,
If
a
NOT OK message appears next
to
a
message
on
the screen, suspect chips
7A and 8A on the
mother
PC
board
(see schematic
"B*W RAM ADDRESSING
AND
RAMS")
.
4. Press
the FIRE button
to go to the
next self
test
.
ARITHMETIC LOGIC TEST
1.
The
ninth
test automatically
checks
the
arithmetic logic
unit registers.
2.
The screen displays
a
vertical stripe which
looks
like the MAIN
SCREEN
RAM
test. The
vertical
stripe moves from
left
to
right across the screen
for about
30 seconds.
3.
When
an ALU OK message appears
on the screen
the
arithmetic logic
unit
is in
working
order.
4. If
an
ALU NOT OK message appears
on the screen,
suspect
ALU
chips
and associated
input address
lines
(see schematic "DATA
PROCESSING")
and
output
RAM
circuits
(see schematic
"B*W RAM
ADDRESING
AND RAMS").
Now
the self
tests
are finished.
To get FIRE ONE out
of
the self-testing
mode, find
the 8-poslton DIP switch
on the
daughter
PC board and
set switch
8
to the
OFF position.
Push
the FIRE button
to
put FIRE ONE back
into the
attract mode.