Fixing Juno-60 buttons / switches

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mrosati
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Fixing Juno-60 buttons / switches

Post by mrosati » Wed May 18, 2011 12:04 am

Had some issues my Juno-60

- completely dead buttons
- intermittently working buttons
- it would randomly jump into manual mode for no known reason

Turns out the Juno-60 uses rubber-dome contact swtiches ( like a miniture PolySix key ) as opposed to the un-serviceable tact switches like in the Juno-106, TB-30 etc. These ones are easy to get at for cleaning & re-seating the rubber-dome. After cleaning up the metal contact with contact cleaner and a little scraping off of the c**p, gently using an eraser on the black conductive part of the rubber-dome & make sure the rubber-dome is re-seated properly, everything is working perfectly. Also doing this to the manual button seemed to solve that random problem.

Pix here:
http://s90.photobucket.com/albums/k270/ ... 0switches/

NOTE: Do NOT use contact cleaner on the black conductive part of the rubber-dome, it would make it worse. The rubber-dome is very thin & fragile, be very gentle when cleaning / handling it's very easy to rip apart.

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Solderman
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Re: Fixing Juno-60 buttons / switches

Post by Solderman » Wed May 18, 2011 12:50 am

I'm currently borrowing a Juno 60 that double-triggers some keys and randomly jumps between 2 octaves when the Octave Transpose switch(at left) is in the normal position. Would you say these are likely candidates for similar cleaning treatments? Since it isn't mine, I have not attempted to examine it yet. I haven't tried DCB yet either to isolate the problem to contact faults.
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EmptySet
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Re: Fixing Juno-60 buttons / switches

Post by EmptySet » Wed May 18, 2011 1:21 am

The 106 might have "unserviceable" tact switches, but they are replaceable with easy-to-find parts. (unlike the JX3P, which seems to be neither serviceable nor have parts available)

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Re: Fixing Juno-60 buttons / switches

Post by rhino » Wed May 18, 2011 2:06 am

chipsforbrains (technology transplants) has a FEW N.O.S. JX3p switches left. About $4 each.
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Re: Fixing Juno-60 buttons / switches

Post by mrosati » Wed May 25, 2011 11:19 pm

Got this from my synth tech:


" That Juno 60 you are borrowing could have a problem with the switch itself maybe! If the switch is anything like those photos you sent me it should be an easy fix no? If its not that, could be a dying multiplexer just guessing. Just a quick look at the sm, IC9 (40H273) on panel board b, page 16 shows that it sends transposition data to the cpu from pin 5&2. This is taking it far though, I'd suspect controls before an IC though. "

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