Vintage Synth Repair

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.
> >
>