Vintage Synth Repair

Wow!  I've been waiting for someone with an H1xx series to do this.  I  
need to get into mine's upper end, I have a tab or two that are being  
a bit pesky.

I'm looking forward to seeing your photos.

Lloyd

On Apr 7, 2008, at 7:21 PM, Bob wrote:

> It has to be taken apart from the top and the front, actually.
> The keys are screwed in from the back, but the key has to be slid
> back to disengage it from the key comb. The black panel on the front
> has to be removed to slide the key back.
> What is your time frame for doing this? I was planning to repair a
> couple keys on one of the H's in the shop this weekend...I planned to
> photograph the process for my picture collection, if this would help
> you.
>
> Bob
>
> - In vintagesynthrepair@yahoogroups.com, "fsimon100" <fsimon001@...>
> wrote:
> >
> > Bob,
> > Thanks. I'm certain I need to take it apart and fix it properly.
> Your
> > picures gave me great insite of the mechanics. Does it disassemble
> > from the front or start at the top and work down?
> >
> > Also the very low volume I'm assuming is unrelated because I can
> hold
> > the preset keys down to hear the organ. As I said the finals are
> > good. Where would you recommend I start scoping the audio signal.
> >
> > --- In vintagesynthrepair@yahoogroups.com, "Bob" <bobmannn@> wrote:
> > >
> > > The preset keys can have the same problem as any of the
> keys...that
> > is
> > > that dirty contacts will prevent them from operating. I had the
> > same
> > > symptoms on my H when I first got it, and still do from time to
> > time on
> > > those keys that see little usage. Normal operation on mine
> returns
> > when
> > > I hold the Cancel key down and tap the offending key rapidly 20
> or
> > so
> > > times to clean the contacts. Maybe you will get lucky and this
> will
> > > help...at least it is worth a try.
> > > As far as the key not staying down, this is not too hard to
> > > fix...however getting to the mechanism can be a challenge,
> > especially
> > > on the lower manual.
> > > The mechanism is simple; there is a spring loaded bar that swings
> > on an
> > > arc under the preset keys. When a key is pressed, a
> > flexible "finger"
> > > under the key holds on to that rod. The Cancel key pushes that
> rod
> > away
> > > from the finger, and releases the preset key.
> > > When the preset key no longer stays down, the "finger" is
> probably
> > worn
> > > or stuck with dried grease, and can be cleaned and/or bent
> slightly
> > to
> > > restore it, assuming the finger is not broken.
> > > I can send pictures of the mechanism if you would like.
> > > In order to reach the mechanism, the keys obviously need to be
> > removed.
> > > If you have never done this, please let me know and I can walk
> you
> > > through it. Also, if you find broken parts during the process,
> > please
> > > let me know as I have a couple H's in pieces out in the shop and
> > would
> > > be glad to donate what I can.
> > > Bob
> > >
> > >
> > > --- In vintagesynthrepair@yahoogroups.com, "fsimon100"
> <fsimon001@>
> > > wrote:
> > > >
> > > > H-100
> > > > My preset keys won't stay engauged. How do you disassemble to
> get
> > > > underneath keys to fix. Also I have low volume if I hold them
> > down
> > > > manually.
> > > > I know final tube outputs are good but not sure where the low
> > signal
> > > > is. Do I scope out from the tonewheel somewhere then at a pre-
> > amp.
> > > Like
> > > > I said I injected a tone into the final tube amps and have
> strong
> > > final
> > > > stage.
> > > >
> > >
> >
>
>
>