Juno Voice Chips (and removing old ones)

[Fraser, Colin J]

> -----Original Message-----
> From: James Jackson [mailto:james at newd.demon.co.uk]
> Sent: 26 May 1999 16:14
> To: synth-diy at mailhost.bpa.nl
> Subject: Juno Voice Chips (and removing old ones)
> 
>         You may know that in the Roland Synths made after 
> 1982, they use
> thru-plated holes (solder on top, bottom and inside). My Juno 
> 106 has a
> broken voice chip (chip 2 - voices 3 + 4). Three things:

Are you *absolutely* sure the voice chip is broken ?
I had a 106 with a 'broken voice chip' that turned out to be a broken 4051
demux.

>         1, How do I remove the chip?

If you're sure it's broken, wiggle the chip back and forward until all the
legs break from metal fatigue.
Then melt the solder holding each pin and pull them out with pliers.
Clean out excess solder with desoldering braid or a sucker.

>         2, Where do I get a new one from

Roland UK Service Department - 01792 515020.

>         3, How do I fit the new one?

Put it in the holes, in the right direction, and solder...


Colin f