Braillo 600 SR, User Manual

Page: 51 / 119

4.2 Troubleshooting, incorrect braille.
Lets say that through proofreading, errors have been found in some of the characters in the printed
text. The first thing to do is:
Check the characters in the text-file in your 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.
On earlier models of Braillo printers, this could be caused by either a electrical problem or a mechani-
cal problem. But on this model of printer, there is integrated a self-diagnostic system that is checking
the magnets continuously during printing, and this will trigger 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
42 printing mechanisms. There are totally 168 printing mechanisms to choose from when the error
search begins. See chapter 4.1, “Printing principle”.
If the printer has been printing a lot (a lot could be either a year, or it could be 1000 printing hours,
depending on what comes first) when this happens, it could be that the printer just needs regular
maintenance. See chapter 4.6 “Magnet rack, cleaning”, and chapter 4.19 “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 is 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 in chapter 4.1 “Printing principle”.
There are several methods to make experiments to confirm that you have found the correct magnet
rack(s). One good method is to disconnect the rest of the magnet racks, and see if the printer still
have problems.
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 does not make dots, then it is probably a mechanical problem. If it does not move and it
is possible to pull the suspected long pivot arm with your finger during embossing and the dots appear.
Then it most likely is 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 overview” for more details.
BRAILLO
l
B 600 SR
51