HP calculator thermal printheads (HP82143, etc)

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Sat May 6 02:45:59 2000

On May 6, 0:24, Tony Duell wrote:
> On Fri May 5, 23:16, Pete Turnbull wrote:

> > > Has anyone here managed to mend a printhead like this?
> >
> > No, but could you use silver-loaded conductive paint?

> Yes, I'd thought of that (and I keep a bottle in my tool box).
>
> Problem is, there's a distinct crack to bridge where the 2 parts have
> been stuck together,so the paint may well not last too well.

Depends on what stress it might be subject, I suppose.

> Worse than that, the printhead is 1/4" wide, and there are 8 tracks in
> that width. I don't fancy trying to paint that lot without shorting at
> least 2 of them together... Soldering on that pitch I could manage,
> though, if only the solder would 'take'.

Ah. Given the thickness of the paint, painting tracks would be difficult,
even with a good-quality fine brush. The only other suggestion I can think
of, is to paint a wide strip, covering all 8 tracks, and then use a scalpel
blade (and some patience) to gently scratch gaps between them.

-- 
Pete						Peter Turnbull
						Dept. of Computer Science
						University of York
Received on Sat May 06 2000 - 02:45:59 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:33:08 BST