Vintage Synth Repair

On Thursday 18 August 2005 11:52 am, David wrote:
> Hi,
> I'm new to this board. I have a totally original Arp 2600 rev2 with
> 3620 kb (never been worked on).

Not ever?  :-)

> It's been put away for many years,

What a waste...

> and I decided to set it up yesterday to check everything out. The exterior
> is pretty rough but it still sounds great. I think my wife is more concerned
> about the exterior than I am...(!)
>
> Although I haven't checked out the patch jacks yet, all the electronic
> components seem to be ok. I'm hoping all I'll have to do is calibrate
> the VCO's (something I've never done before) and clean the sliders.

Personally I wouldn't mess with the sliders if you don't have to for some 
reason.  If you're gonna calibrate anything at all,  do the power supplies 
first!

> I've been reading through the archives and found a couple of threads
> on slider maintenance. I was ROTFLMAO when I read about submerging the
> unit in a DeOxit bath (msg 657) :-))

There's archives?  :-)

> Now for my question. My 3620 keyboard has always had a problem with
> erroneous (multiple) triggers. I haven't opened it to look at the
> mechanics, but many years ago a local tech told me this is a common
> problem and the fix isn't a big deal. Some keys are worse than others,
> but four or five are bad enough that spurious triggers occur during
> normal playing.
>
> Can anyone tell me what's involved to resolve this problem?

I don't remember running into this,  but although I've worked on a LOT of 
those units it's been a while.

I'll be looking forward to seeing other responses to your post as well.

And,  anybody have any old ARP junk they don't want,  send it to me!  :-)