At 08:28 PM 1/13/2001, you wrote:
>I would like to know the experience of anyone who has used conductive silver
>ink for repairing tracks on a PCB.
>
>I have a handy Casio solar calculator. It is quite thin and has a nice big
>display. Once it got wet in the rain and after that certain segments are
>missing in the digits. An examination of the PCB reveals that the board is a
>thin mylar sheet and all the tracks are made of conductive polymer. Some
>tracks need to be repaired. I am wondering whether to buy the silver ink
>from the market. The 10ml pack costs roughly twice as much as the calculator
>itself!
>
>Are there less costly alternatives available for repairing polymer tracks on
>a PCB?
>Any suggestions please?

  I've had pretty good luck with the fluid that comes with the repair kits
for automotive rear windshield heater repair kits. I don't know how much
cheaper this is likely to be, but you can pick it up in an auto supply store.

  This stuff is brown so I don't think it's silver, but I've used it to
repair surface pcb traces that were originally silk screened silver ink.
Equipment still worked years later. And I would imagine  the stuff can
handle some current.

regards,

Carl



----------------------------------------------
Henry Carl Ott   N2RVQ
tech@si.rr.com

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