Braillo 650 SF, User Manual

Page: 64 / 155

BRAILLO
l
B 650 SF
64
4.2 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 the text-file is OK, the problem is caused by the Printer.
On earlier models of Braillo Printers, this could be caused by either an electrical problem or a mechan-
ical problem. But on this model of Printer, there is an integrated self-diagnostic system that is checking
the magnets continuously during printing, and will trig an alarm if it detects some electrical problems
with the magnets. So, the missing dots found here are probably caused by some faulty mechanical
parts or it could be dirt clogging the moving mechanisms.
Inside the Printer there are four identical magnet racks, named from A to D. Each magnet rack contains
45 printing mechanisms. There are totally 180 printing mechanisms to choose from when the error
search begins. See chapter 4.1, “Printing principle”.
If the Printer has been printing a lot (it could be after a year, or after 1000 printing hours, depending on
what comes first) errors in the characters could occur. If this happens, it could just be that the Printer
needs regular maintenance. See chapter 4.6 “Magnet rack, cleaning”, and chapter 4.18 “Maintenance”.
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(s) is causing the trouble.
If there are missing dot(s), use the X-pattern to detect which magnet rack(s) 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 on the following pages.
There are several methods to confirm that you have found the correct magnet rack(s). One method is to
disconnect the rest of the magnet racks, and see if the dots in question still appears.
To determine if a problem is electrical or mechanical.
See if the suspected pivot arm is moving like the rest of the pivot arms on the magnet rack. If it does
move, but still not making dots, it is probably a mechanical problem. If it does not move, it is possible
to pull the suspected long pivot arm with your finger during embossing. If the dots appears the problem
is likely caused by some problems in the electric circuits.
If one magnet rack is missing all the dots all the time, it could be because of a blown fuse. On the back
of the magnet racks there is a red light that is indicating that the magnet rack has power. If this light is
dark, check the fuse for the magnet rack.
See chapter 6.2 “Electric unit Printer overview” for more details.