[sdiy] Fixing an roland R5

[Ullrich Peter]

Hi!

If the mechanical stress at the crack position is too high why not making the flexistrip stiff there.
Take a two component glue and fix maybe a thin piece of a PCB below the crack so that the crack is really fixed - then fix the electrical connection with a silver laquer.

The flexiprint is not a moving component inside the R5 - should only be in movement while servicing the unit!

Ciao
Peter

http://www.ullrich.at.tt


-----Ursprüngliche Nachricht-----
Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] Im Auftrag von Steve Lenham
Gesendet: Montag, 9. April 2018 13:22
An: synth-diy at synth-diy.org
Betreff: Re: [sdiy] Fixing an roland R5

On 09/04/2018 11:59, Florian Anwander wrote:
> Hi
> 
> Am 09.04.2018 um 12:11 schrieb Adam Inglis:
>> As last resort I guess I’d use point-to-point wiring
> 
> There is no point-to-point wiring. The wire leads to a switchmatrix 
> which is achieved in the foil.
> 
> I had the same problem with my Chroma Polaris. I wasted weeks on 
> trying to resolder it or to repair it with conducting lacquer. The 
> mechanical stress is always much bigger than anything electrical 
> useful (solder /
> lacquer) could stand. The foil will continue to crack.

It is certainly a challenging thing to repair. As Florian says, there is no point trying to repair the crack directly since the stress is too high there.

If replacement of the whole sheet isn't an option, I would suggest very carefully exposing the conductor at a point on each side of the crack where the sheet is not required to bend. You may need to move quite some distance from the crack to find a suitable area, but it doesn't matter. 
Then attach a piece of thin Kynar-covered wire between these points using conductive epoxy adhesive (Google for it). Do not even think about going anywhere near it with a soldering iron! Make the glued joint as long as possible to maximise strength.

Hope this helps - good luck with your repair.

Cheers,

Steve L.
Benden Sound Technology
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