Vintage Synth Repair

Looks like its every eighth note and as a lot of keyboards use a diode matrix (8 x 8) then there is probably a bad connection/dry joint on one of the lines.I once bought a keyboard from a car boot with the intention of using just the keybed but when I turned it on I noticed notes were'nt playing in a regular pattern.It turned out someone had spilt something on the keyboard and it had corroded one of the tracks in the matrix.Repaired the track and lo, all notes worked so put it back together and gave it to my granddaughter. Still need to find another keyboard for a project though.
Regards Colin 
On Thursday, 15 May 2014, 1:52, "Daniel Forró dan.for@tiscali.cz [vintagesynthrepair]" <vintagesynthrepair@yahoogroups.com> wrote:

 
Yes, it can be a connector, or some dirtiness or oxidization inside. Or some of diodes on keyboard PCB are dead (usually they are used there) but it's not so often. Or some IC in keyboard circuit, check if any of them is in socket, maybe reseating can help.


Daniel Forro




On 13 May, 2014, at 9:08 AM, mpigott2@... [vintagesynthrepair] wrote:




>
>The problem is back, lowest E then next C up, then next Ab up then Next E.
>Should I check the harness to the keys.  The problem went away for 4 months, but is back. Have to use my emergency spare JX-3P...argghhhh 
>