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Now
you
can
run
the local test.
1. Plug
the
test connector into the serial interface receptacle.
2.
Turn
the
printer
ON.
The
serial interface will check
the
memory function of the printer's message buffer, the interface
driver
and
the receiver circuit,
and
then
print
all
the
characters in a test pattern.
3.
This test
button
can
be
stopped
only
by
turning
the
printer
OFF
or
pressing the SELECT button.
4.
The
test
produces
the
following:
The
printer
prints
this message: LOOP TEST
The
message buffer size is printed.
The
printer
checks
the
memory
function
of
the message
buffer,
then
prints
OK
if
the
memory
check is good,
or
BAD
if
the
memory
check is faulty.
The
signal logic is checked,
and
if this is faulty, BAD is also
printed.
Hexadecimal characters from 20
to
7F are transmitted through
the
TO (Transmit Data) line,
and
received
through
the
RD
(Receive Data) line,
then
written
to the message buffer. The
above stored
data
is then printed.
This process repeats until
the
printer
is
turned
OFF
or
until
you
press
the
SELECT button.
Note:
If
BAD is printed, call your dealer for assistance.
C-
10 Interfacing
205


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