[sdiy] Roland Filter Module ( for Juno106&friends )

[harrybissell]

Hi Nicholas...

Nicholas Gregorich wrote:
> 
> I would think that if a solvent could eat the epoxy it would surely eat at least plastic packages as well.


actually it can be done. Most of the old school potting epoxies could be
dissolved.

Plan on becoming an expert "forensic engineer" if you do it. Crow had
some
photos on his site of the process.  It is NOT for the faint of heart.

> 
> Would heat + chisel cause damage?

Hell, yes. I bought the Gentle Electric with the understanding it was
'as-is' because of an inability to test. When I got it... it was clear
that
someone was aware that it was VERY hurt and had tried to repair it.  OK
I bought it for two reasons...

1) I wanted it in 1976 when I could not afford it
2) I wanted to know if it would work, or how it works

Once I decided the module was toast... who cares if the chisel and torch
do more damage.  I cracked the potting case off it, and the torch melted
the solder.. causing the epoxy to lose grip on the foil side of the
board.
With the circuit that was NOT potted, I could infer what was on the
component
side of the board by looking at the foil... ~and~ metering the circuit.
I also
has a good guess of what I might expect to find.  

I consider the effort a success...

1) I ahve a working unit
2) I know HOW it works
3) I know that, had I bought in 1976 when I could NOT afford it, that I
   would have been sorely disappointed.

Is that worth $250 + shipping and nnn years subtracted from your life
??? :^P

knowledge is its own reward... worth the time and effort, is a judgement
call.

I say, CUT 'EM UP !!!

H^) harry


> 
> Definitely not worth the time nor effort, especially with chemicals that dissolve epoxy.  Imagine an accidental spill!
> 
> Nick.
> 
> On Tuesday, April 11, 2006, at 08:44PM, harrybissell <harrybissell at prodigy.net> wrote:
> 
> >Ask "Old Crow" (aka Scott Rider) what he uses to unpot 'potted' modules
> >
> >rest assured you will suffer a lingering death from cancer for your
> >knowledge... but in the grand tradition of wizardry... did you expect
> >something
> >for nothing ???   :^P
> >
> >H^) harry
> >
> >Nicholas Gregorich wrote:
> >>
> >> I've tried doing this with about 8 or 9 80017As.  I have been able to recover a couple BA662 but the IR3109s break very easily.  I tried a couple brute force methods but I never tried any solvents.  I doubt its possible to "clean" the epoxy off, as we use DP-270 potting epoxy at work for anti-tamper reasons.
> >>
> >> Good luck with your chiseling and please report any progress!
> >>
> >> Nick.
> >>
> >> On Tuesday, April 11, 2006, at 02:23PM, Tom Arnold <xyzzy at sysabend.org> wrote:
> >>
> >> >By any chance has someone chisled off the cover of a Roland 80017A module?
> >> >I know at one time there was a guy selling a module that would replace the
> >> >VCAs but use the IR3109 in the partially bad original module.  One of my
> >> >filters is "noisy" ( crackles after it warms up ) and I was pondering
> >> >attempting to try a hack fix on it, maybe using a BA6110 and see how it
> >> >sounds.
> >> >
> >> >--
> >> > -----------------------------------------------------------------
> >> > - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
> >> > - SynthGeek        -
> >> > - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
> >> > - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
> >> > --------------------
> >> >
> >> >
> >> >
> >
> >