BRAILLO
l
B 650 SW2.1
79
Possible reasons for errors:
See figures on the next page.
If a dot from a certain printing pin is missing regularly, the reason might be one of the following:
1.
Defect magnet (The self-diagnostic system should find this one first).
2.
Broken short pivot arm.
3.
The long pivot arm cannot move because of dirt.
4.
The printing pin is stuck because of dirt, causing the short pivot arm to miss the long
pivot arm.
5.
Errors in the magnet rack board.
If dots from several printing pins are missing now and then, the reason might be one of the following:
1.
The silicone string is pushing too hard on the long pivot arm.
2.
The gap between the two pivot arms is too large.
3.
The support list has become sticky on the side against the long pivot arms, and the
long pivot arm does not move properly.
4.
The sponge list on the short pivot arm is so worn/compressed so that it will not give
enough tension on the pivot arm.
If there are too many dots on the paper, the reason might be one of the following:
1.
The silicone string is not pressing enough against the long pivot arm.
2.
The gap between the two pivot arms is too small.
3.
The magnet poles have become sticky, and this causes the pivot arms to stick to the
magnet.
4.
The long pivot arm does not move properly.
Control:
To be sure that you have found the right mechanism after the troubleshooting, you can do the follow
-
ing test: Pull carefully the suspected long pivot arm against the magnet with your finger.
Note! Please be careful to avoid getting in contact (e.g. clothes, hair, beard, jewellery or any part of
the body) with any other moving parts of the printer to prevent personal injuries!
At the same time, run a test print. The mechanism with the finger on, will make a column of dots
downwards the sheet until you take the finger away. By doing this you can see if this column of dots is
situated on the same place (and same side!) of the sheet as the error is.
Observe that the same printing mechanism (magnet, long pivot arm, short pivot arm and printing pin)
makes all the dots in a column downwards the page.
