Vintage Synth Repair

i need to repair a trace on this keyboard. looks like it's the result of 
a spill. it's in a very delicate area - right under the rubber key 
trigger pad, or very close to it. i've got it narrowed down to within a 
few millimeters. i don't see bridging with a piece of wire or foil as 
being an option here. the traces are too close together and a piece of 
wire would interfere with the trigger pad. any advice or helpful links?

thanks,
shayne

You should be able to scrape off the protecting layer over the trace 
with a miniature flat blade screwdriver. Then, you could use nickel 
paint to patch it, or one of the products used to repair car rear window 
defrosters (should be cheaper and you won't be forced to buy ton of it).

Shayne Cafferata a \ufffdcrit :

> i need to repair a trace on this keyboard. looks like it's the result of 
> a spill. it's in a very delicate area - right under the rubber key 
> trigger pad, or very close to it. i've got it narrowed down to within a 
> few millimeters. i don't see bridging with a piece of wire or foil as 
> being an option here. the traces are too close together and a piece of 
> wire would interfere with the trigger pad. any advice or helpful links?
>
> thanks,
> shayne
>
>

Go to www.caig.com and get yourself a 'CircuitWriter' Precision
Conductive Ink Dispenser. Carefully scrape the green soldermask off
and apply the conductive ink. Should do the trick.

--- In vintagesynthrepair@yahoogroups.com, Shayne Cafferata
<scafferata@...> wrote:
>
> i need to repair a trace on this keyboard. looks like it's the
result of 

> a spill. it's in a very delicate area - right under the rubber key 
> trigger pad, or very close to it. i've got it narrowed down to within a 
> few millimeters. i don't see bridging with a piece of wire or foil as 
> being an option here. the traces are too close together and a piece of 
> wire would interfere with the trigger pad. any advice or helpful links?
> 
> thanks,
> shayne
>

follow the traces to the components they eventually go to, and join
those two points with a bridging wire, even on the other side of the
board if necessary.



-- 
Merlin Zener
piano, synthesizer.

thanks, for the helpful posts guys. i'm going to try the rear defog
repair kit option cuz that's what's close by and it sounds logical.
i'll have to come up with one helluva finetip applicator. not wanting
to look a free-advice-horse in the mouth, but you've used this method
before with good results?

thanks,
shayne

I know that people used to unlock CPUs for faster speeds with that 
product back a few years ago, there are many miniature contacts quite 
close to each others. You'd have to stick two tape bands and paint the 
area between them.

shaynecafferata a \ufffdcrit :

> thanks, for the helpful posts guys. i'm going to try the rear defog
> repair kit option cuz that's what's close by and it sounds logical.
> i'll have to come up with one helluva finetip applicator. not wanting
> to look a free-advice-horse in the mouth, but you've used this method
> before with good results?
>
> thanks,
> shayne
>
>

sounds dandeh, got the stuff, gonna give it a go.
thanks again!
shayne

>
>
>       Posted by: "Antoine Desch\ufffdnes" antdes45@...
>       <mailto:antdes45@...?Subject=%20Re%3A%20kawai%20p260%20trace%20repair>
>         antdes45 <http://profiles.yahoo.com/antdes45>
>
>
>         Tue Sep 9, 2008 4:52 am (PDT)
>
> I know that people used to unlock CPUs for faster speeds with that
> product back a few years ago, there are many miniature contacts quite
> close to each others. You'd have to stick two tape bands and paint the
> area between them.

I would pick Merlin's idea. Cheapest safest route and I've been doing repairs 25+ yrs

Scott  Frye
AudioFixation
Consumer / Pro Audio Repair
Southern VT 

"Resistance is futile but.....
Impedance is much more complex"

>
>
>
>       Posted by: "scott frye" painintheamp@...
>       <mailto:painintheamp@...?Subject=%20Re%3A%20kawai%20p260%20trace%20repair>
>         painintheamp <http://profiles.yahoo.com/painintheamp>
>
>
>         Wed Sep 10, 2008 6:21 pm (PDT)
>
> I would pick Merlin's idea. Cheapest safest route and I've been doing 
> repairs 25+ yrs
>
> Scott  Frye
> AudioFixation
> Consumer / Pro Audio Repair
> Southern VT
>
> "Resistance is futile but.....
> Impedance is much more complex"


> follow the traces to the components they eventually go to, and join
> those two points with a bridging wire, even on the other side of the
> board if necessary.
>
> -- 
> Merlin Zener
> piano, synthesizer.
i thought of doing this but it appears not to be an option. when 
pressed, the center of the keypad makes contact with 2 separate traces. 
one trace is broken between the center and just outside the keypad. it 
then splits off, one path chaining a group of keypads and the other 
going to a resistor. there is no component on the underside to bridge to 
from the resistor. the trace just terminates at the center of the keypad.
thanks for the input,
shayne

just to update:
the rear defog repair kit suggestion worked like a charm.

cheers! 
shayne

Good to hear! I thought that if it's working without problem on 
miniature easy-to-lift gold-plated contacts on CPUs, it probably won't 
cause any trouble on a PCB trace. Also, the product probably isn't 
resistive, as it's made to fix small areas on defoggers.

Cheers,
Antoine

Shayne Cafferata a \ufffdcrit :

> just to update:
> the rear defog repair kit suggestion worked like a charm.
>
> cheers! 
> shayne
>