Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, "jahg88" <jahg88@...> wrote:
>
> --- In vintagesynthrepair@yahoogroups.com, "inocencio66" 
> <paulo.simoes5@> wrote:
> >
> > My SH-101 was in worst shape than I thought: broken copper traces 
> near  
> > one of the keyboard matrix connectors. Reflowing the solder joints  
> > didn´t do any good as it quickly melted the phenolic (or whatever 
> > material is the PCB made of) and the traces jumped off. 
> > 
> > As the keyboard contacts are of the conductive rubber type, the 
> copper 
> > traces lead to what seems like conductive carbon ink pads, so 
> there´s 
> > nothing solderable to run "oops wires" from. 
> > 
> > One possible solution might be removing the varnish at the 
> connector 
> > end, exposing enough solderable copper area. What can be used as 
> > solvent?
> > 
> > There is also one special silver ink pen that I could use to redraw 
> new 
> > traces directly from the carbon pads, but how well would the ink 
> bond 
> > to the pads? I coudn´t measure the carbon´s resistance, let alone 
> any 
> > signs of continuity... 
> > 
> > Do you know of a more conventional way to do the repair?
> > 
> > Any advice would be greatly apreciated.


Try a conductive paint pen.
>