[sdiy] Need urgent help, Juno 106 key contact broken lead

[Gil W.]

Tested resistance again, that pain creates about 5Kohm of resistance. Can this work ?

I believe any conductive paint will be resistive to a certain amount... what's the maximum resistance I should measure so the key still triggers ?

Thanks a lot !!


--------------------------------------------
On Mon, 9/30/13, Gil W. <gil_we at yahoo.com> wrote:

 Subject: Re: [sdiy] Need urgent help, Juno 106 key contact broken lead
 To: synth-diy at dropmix.xs4all.nl, "Bob Weigel" <sounddoctorin at imt.net>
 Date: Monday, September 30, 2013, 1:09 AM
 
 Hi all and thanks very much !
 
 As I already answered to Rob, I got this product which I'm
 not sure is going to work:
 http://www.thinkgeek.com/product/b70c/
 
 I just tested it on a paper. Put some amount and let it dry
 for an hour. The resistance measured between two points on
 the paint which has dried on the paper is between 800ohm to
 3000ohm (varies).
 
 If I use this on the broken Key lead, will that amount of
 resistance still let the key trigger correctly ?
 
 Or should I look for pure silver paint, measuring complete
 zero ohm resistance ?
 
 Thanks a lot.
 
 
 
 
 --------------------------------------------
 On Mon, 9/30/13, Bob Weigel <sounddoctorin at imt.net>
 wrote:
 
  Subject: Re: [sdiy] Need urgent help, Juno 106 key contact
 broken lead
  To: synth-diy at dropmix.xs4all.nl
  Date: Monday, September 30, 2013, 12:13 AM
  
  On 9/29/2013 2:52 PM, Julien
  Delgoulet wrote:
  > Hi Gil !
  >
  > "Funny" my 106 had the same issue.
  > What I did is :
  >
  > #1 : Use a small pin ( the one you use when you "sew"
  ;-) )
  > #2 : remove the solder mask using it to reach the
  "track"
  > #3 : Simply had a wire (I use resistors legs that I
  kept when soldering stuff).
  >
  > This worked perfectly and was done in no time.
  > I pushed some photos here : http://giorgo2001.free.fr/Juno106 so you can see the
  whole process.
  >
  > Good Luck !
  >
  > Le 29 sept. 2013 à 22:35, "Gil W." <gil_we at yahoo.com>
  a écrit :
  >
  >> Hello friends.
  >>
  >> Today I took my beloved Juno 106 out of storage
 to
  prepare it for a show. Checking the keyboard I found one
  dead key.
  >> I took the keyboard, key and rubber stripe off to
  see what's under it. What I found was that at the very
 point
  where
  >> the keyboard PCB trace for the certain key, meets
  one of the "half moon" contact, there was some kind of
  corrosion.
  >>
  >> I checked the contact between the PCB trace and
  it's half moon, and found there was no contact between the
  two.
  >> That right-hand half moon is supposed to be
  connected to the same line with all other right-hand half
  moons of all other keys.
  >>
  >> I'm afraid to try anything before I have your
  advice so I don't cause any further damage... These PCB's
  are impossible to find.
  >>
  >> How can I reconnect the track to the half moon
 and
  keep good contact between them ? I'm afraid soldering iron
  is not going to work here ?
  >>
  >> Thanks very much for your advice !
  >>
  >> Picture here:
  >>
  >> http://i774.photobucket.com/albums/yy25/system100m/106_zps4f95c99c.jpg
  >>
  >> _______________________________________________
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  >> Synth-diy at dropmix.xs4all.nl
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  > Synth-diy at dropmix.xs4all.nl
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  >
  >
  Yeah if you can get onto a solder trace you can bridge it
  with spring 
  tension sometimes.  Also though I've used the trace
  repair stuff from 
  ..who is it chemtronics or....I'd have to look.  Radio
  shack carred the 
  'pen' that you can paint conductive material with. I fixed
 a
  couple 
  Kawai Midi Grand pianos (the big ones..) that were used on
  the river 
  boat in Lake Conroe some years back that way. People had
  spilled drinks 
  that ate traces here and there. Hopefully it's still
  working...
  
  -- 
  Check out sounddoctorin.com for songs, a studio tour, help
  repairing old synthesizers and parts or thought provoking
  articles that could help make your eternity!
  
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