Vintage Synth Repair

Ah you're the Nakusp guy who has had some interesting things over the years,
nice modern stuff coming out of labels up that way.  I'm in Victoria.

There is a fellow from hawkwind to the east of you off Kootenay Lake I
think.

 

Lorne in Canada

 

From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of dwv1957
Sent: Monday, December 17, 2012 11:52 PM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Re: Arp challenge.

 

  

Hi Jim,
I used to live in Aldergrove, I now live in Nakusp.
We met 10 or 12 years ago through a mutual friend, Larry Vollans
I have been restoring old analog synths for over 20 years now, drop me an
email if you need any more help.

Dave

--- In vintagesynthrepair@yahoogroups.com
<mailto:vintagesynthrepair%40yahoogroups.com> , Jim Blair wrote:

Hey thanks Dave.

And yes, I do live on Vancouver Island.

I operate a small recording studio that specializes in vintage keyboards.

http://www.facebook.com/ApeIslandSound

Are you in the area?


Jim



At 11:27 AM 12/17/2012, you wrote:


Since all the other keys work, I would suspect 
the problem is the key it's self.
Does the ProDGX use a resistor or diode keyboard?
Either way, check for a bad resistor/diode on 
the suspect key, also look for cracked solder 
joints, or possibly a short to the gate or after-touch buss.

On a side note, do you live on Vancouver Island?

Dave

--- In 
vintagesynthrepair@yahoogroups.com
<mailto:vintagesynthrepair%40yahoogroups.com> , 
Jim Blair wrote:

Thanks for your reply, DT.

No sample and hold on the ProDGX.

The note does not stay at the correct frequency
when held. The pitch drop happens immediately on "note on".

J wires are aligned, and cleaned, as is the bar.


Jim


At 05:34 AM 12/17/2012, you wrote:


Hi Jim,

The fact that the rest of the keyboard works
fine seems to rule out that the sample hold
function is awry. Does the note stay at the
correct frequency if you hold it down? Is it
only pitch dropping on the release? Have you
checked to make sure the Jwires are aligned
properly on that key? Maybe open it up and check
to ensure that the contact wires on that top key
are aligned the same way as for all the others.
If not, bend them back carefully to match the others.

(but I'm not really a tech, so don't just listen to me).

best DT

--- In

vintagesynthrepair@yahoogroups.com
<mailto:vintagesynthrepair%40yahoogroups.com> , 

Jim Blair wrote:

Hello!

Here's an odd one up for discussion. I have a Arp ProDGX. Everything
works fine....except.....if I hit the top key (highest note) it
briefly plays the note, then very quickly drops down to a much lower
note (almost instantaneously). After this little event, every key
stops working, other than a click for each note.

This happens on every patch.

Then, if I turn the power off, then back on, everything is fine again
until the next time I hit that highest note.

Any suggestions on where to point my screwdriver and multimeter?


Thanks,

Jim Blair
Ape Island Sound


http://www.facebook.com/ApeIslandSound
http://www.facebook.com/ApeIslandSound




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