From: Frank Gruendel (fg2_at_pda-soft.de)
Date: Mon Jan 27 2003 - 13:18:11 PST
> Jaggies are caused by a deformation (twist) of the upper plastic case half.
> It is especially the right long side of the case, which is sort of weaker
> due to the lid mechanism. Its long edge is pressing constantly onto the
> screen and fools the pen digitizer.
This is correct. The edge is pressing especially if the Newton is in portrait
mode and you write with your right hand. You can easily prove this by
drawing a vertical line while pressing on the right side of the case, most
times the pen position will jump to the left if you do.
> I removed at both jaggied MP2kx the
> upper case half and the jaggies disappeared and reappeared after remounting.
> Then I removed about 0.2mm of the edge with a milling machine and cleaned
> and remounted everything and the two Newtons are now cured and work fine
> since that modification.
Congratulations. But this does not always work. When I fixed Victor's 2100
(which hopefully will arrive soon...), I also did the removal thing. This helped
to a certain degree, but it didn't make the jaggies disappear. They disappeared
when I replaced the display AND the upper part of the case. Unfortunately,
after I put the other display in, I noticed the problem with the pen losing its
alignment when drawing close to the Newton logo. Since this problem hadn't
been there before I replaced the display, I replaced the main logic board, too...
> I needed about 4 hours for all of my experiments and the repair.
This is only when doing it for the first time ;-)
Cheers
Frank
-- Newton hardware and software at http://www.pda-soft.de
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