Vintage Synth Repair

----- Original Message -----

From: Bob

To: vintagesynthrepair@yahoogroups.com

Sent: Monday, April 07, 2008 8:21 PM

Subject: [vintagesynthrepair] Re: Hammond H100

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" ..>
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" 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"

> > 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.
> > >
> >
>