Rom Self-Test; Procedure 3_7 - Atari 1025 Field Service Manual

ROM
SELF-TEST
PROCEDURE
The
1025
printer
has a
built-in self-test
designed
to
exercise
some
functions
of
the
ROM,
including the functions
for 10 print
characters
per inch, 6 lines per
inch,
the
standard character
set,
and the 80
column
print width.
These
are the functions that
the
printer defaults
to
unless
it is
given
special
commands.
This test
does not
determine whether
the
ROM
governing
the
16.5
character
per inch,
the
8 lines per
inch,
the international character
set
and
the 64
column
print
function are operating
correctly.
EQUIPMENT
•
Small needle-nose
pliers
PROCEDURE
• Disconnect
the I/O cable
from
the computer.
•
Turn the power
switch on the back
of the printer
OFF.
•
Follow
the
Upper Cover
Disassembly procedure on page
4-1.
•
Do
not
remove
the
PCB.
Locate
the
jumper
plug (SP1) on the
left
corner
of
the
PCB
and with
a
pair of
small needle-nose
pliers,
move
the shorting plug
from
the right to the
left,
from
position
A
to
B
(as
marked
on
the
PCB).
•
Load
the paper.
•
Turn
the
power
switch
at the
back
of the
printer
ON.
Make
sure that the
PRINT
switch on the
front panel
is
ON.
•
Return
to
the Diagnostic Flowchart.
SPECIFIC
COMMAND
CODE
FAILURES
If
the
customer complains
about
a
specific
command
code
or
command
code
combination
that
fails
to
work,
for
example European
characters
in 5
characters/inch,
you can
specifically test that code. Refer
to
the Diagnostic
Program
for
Testing on
page 3-2
and
follow
it
through Step
3
on page
3-3.
Then
refer to Table
1.
Character
Command
Codes, on page
3-4,
and
enter the code
for the specific functions desired.
Press
RETURN.
If
the
command
does
not execute
correctly,
swapout Q5, Q8, and Q6.
Return
to
the Diagnostic Flowchart.
Atari 1025 Printer
Field Service
Manual
3-7