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Texas Instruments 880 - The Barberpole Test; 4.2 Troubleshooting

Texas Instruments 880
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4.1.3
BarberpoleTest
Follow these steps
to
enter the test mode and print
the barberpole test:
1.
With the printer
in
the Normal mode, take
the printer off line by pressing the On Line
key. The On Line indicator turns off.
2.
Press
the
Command
key. The
Normal
indicator turns off, and the
Command
indicator turns on.
3.
Press
the Test
key.
The
Test
indicator
turns on. The printer immediately prints the
status report.
4.
Press
the Change
key.
The printer begins
to print the barberpole pattern. To stop the
barberpole test,
press
the
Accept
key or
the
Normal
key.
(The barberpole test
stops automatically after
190
lines.)
NOTE
If
a current loop or
an
RS422
Interface
option
is
installed, a parity error, code
24, may occur. This error does
not
affect printer operation.
Figure 4-2 shows a sample barberpole pattern.
4.2 TROUBLESHOOTING
Faulty printer operation
can
occur
because
of
loose
connections,
an
incorrect electrical ground, power
spikes or electrical interference. Check that power
and data cable connections to the terminal
are
made
as
specified
in
Section 2, "INSTALLATION,"
and Appendix
0,
"POWER
REQUIREMENTS
AND
GROUNDING."
If
the Error indicator
is
blinking rapidly, check for
jammed paper or anything that may be blocking the
movement
of
the printhead.
Press
the Reset key.
If
the Paper
Out
indicator
is
blinking,
see
that the
paper covers the paper-out switch.
Press
the Reset
key.
If
you
are
not sure
of
the
cause
of
a problem, go
into the test mode and print a status report. The
error code may contain the explanation
of
the prob-
lem.
If
you
are
using the
serial
interface, check the
"RS232" line
of
the status report for correct status
of
the DSR, DCD,
and
CTS
lines.
See
Table 7-3.
Error codes
23,
24,
29,
2A, and 2B
are
communi-
cation errors.
Go
into the
menu
mode and print a
configuration report
(see
Section
2).
Are the correct
configuration codes
active?
Check the "RS232" line
of
the status report.
If
the printer
is
not
successfully performing a partic-
ular task,
ask
yourself
if
it
has
ever done this kind
of
task for you before.
If
it
has,
try
to
determine what
condition
is
different this time.
Use
the power switch to turn the printer
off
and
then back on. The printer will execute power-up
self tests
as
described
in
Section
2.
If
the On Line,
Paper
Out,
Test,
Menu,
and
Error
indicators fail
to turn off, the problem will require a service call.
(On Line comes back
on
if
9B
is
set.)
An
optional loopback board (T/ Part No.
2222661-
0001)
is
available that will allow you to route the
serial, on
line barberpole output back to the printer.
This
is
a
means
of
checking the printer output driv-
ers.
0123456789:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnop
123456789:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\JA_'abcdefghijklmnopq
23456789:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnopqr
3456789:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnopqrs
456789:;<=>?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnopqrst
56789:;<=)?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnapqrstu
6789:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnopqrstuv
789:;<=)?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnapqrstuvw
89:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdef9hijklmnopqrstuvwx
9:;<=)?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdefghijklmnapqrstuvwxy
:;<=)?~ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]A_'abcdef9hijklmnopqrstuvwxyz
Figure 4-2. Barberpole Test
2222627-15
4-5

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