[HAM] M-102- vibrato rotor shaft spinning , but

[David Anderson]

David,

It's been a while since I had a scanner completely disassembled, but  
if memory serves, isn't there a spring in there somewhere that  
couples the bakelite gear to the shaft in some fashion? The trouble  
with the Hammond manual is that it doesn't have a lot of detail in  
terms of the scanner parts in that area.

But I do recall that the vibrato rotor lags behind the main generator  
shaft at start-up so as not to load the start motor too much.

Is there any way you can run the generator with the scanner cover off  
to see if it will come up to speed?

You deserve a medal for going beyond the call of duty to save this  
scanner. I've never heard of one being so much trouble.

David A.

On Jul 1, 2008, at 3:15 PM, David Damroze wrote:

>     The rotor shaft in the vibrato scanner is now spinning quite  
> nicely
> by hand after letting it
> soak in oil for a couple of days. However, I've partially reassembled
> the scanner and when I spin
> the flywheel on the TG side of the scanner, the rotor spinneth not  (
> after much toil).
>    Is there some peculiarity of the mechanism where it will work once
> the whole thing is
> back in the organ i.e. an electro-magnetic clutch of some sort? Does
> the clutch only
> operate at certain RPMs? Is it possible that the clutch is burned out
> from the organ being run
> while the scanner bearing was froze and, if so, what do I check next.
> Does it reside in the
> metal box like structure under the little pan with the oil sponge
> within ?
>
>   David D.
>