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BRAILLO
B 650 SW2.1
l
5.4
Troubleshooting, incorrect Braille
If any errors have been found in some of the characters in the printed text during proofreading, the
first thing to do is:
Check the characters in the text-file in the computer to find out if the error could come from the text-
file and not from the printer.
If your text-file is OK, the problem is caused by the printer.
The errors could be caused by either an electrical or a mechanical problem. On the electrical side,
there is integrated a self-diagnostic system that is continuously checking the magnets during printing,
and will trig an alarm if it detects some electrical problems with the magnets.
So, if no alarm is trigged, the errors found are most likely caused by some faulty mechanical parts or
maybe dirt clogging the moving mechanisms.
Inside the printer there are four identical magnet racks, named from A to D. Each magnet rack con-
tains 45 printing mechanisms. There are totally 180 printing mechanisms to choose from when the er-
ror search begins. See section
'Which magnet makes what dot?' on page
77 for more information.
If the printer has been printing a lot (a lot could be after a year, or after 1000 printing hours, depend-
ing on what comes first) errors in the characters could occur. If this happens, it could just be that the
printer needs regular maintenance. See section 5.8 'Magnet rack - cleaning' on page
87, and sec-
tion 5.27 'Maintenance' on page
113.
As a start, you should run the built-in Test Print. Depending on what kind of errors you have, you
should use different tests.
The essential thing at this stage is to find which magnet rack is causing the trouble.
If there is missing dot(s), use the X-pattern to detect which magnet rack is missing the dot(s).
If there are too many dots, use the full cell lines, or the test pattern on test print no. 4, and the extra
dot(s) will appear in the space between the lines.
However, the best test is ordinary text, if a proofreader is available. To locate the faulty magnet
rack(s), see figures and the table in section
'Which magnet makes what dot?' on page
77.
To confirm that you have found the correct magnet rack, you can test the magnet racks with the func-
tion 'X pattern without motor' found in the 'Manual running' menu (Main Menu - Warning - Service/
diagnostic - Warning - Manual running). This function will run the magnets one by one sequentially
without running the rest of the printer mechanism.
If a pivot arm does not move properly like the other pivot arms, it could e.g. be that the pivot arm is
clogged, or that the silicone string is pushing to hard. If the suspected pivot arm is moving like the rest
of the pivot arms, the problem might be within the short pivot arm/printing pin mechanism or with
the position of the magnet rack itself.
To verify that you have found the correct pivot arm/magnet mechanism, it is possible to manually pull
the long pivot arm against the magnet with your finger while the printer is embossing.
A column of dots will then appear, and if the column is situated exactly on the same position as the
error was in the first place, you have found the correct one.
76
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