M series Tone Gen

[Guest]

I just picked up an M series in nice condition, here's the problem:</p>

after I switch to the run position, as I let off the start button, you can here the tone gen slow down to a stop. any note being played just looses it. Where do I start?</p>

Thanks
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[johnny b3]

Re: M series Tone Gen



The first and easiest place to check is the run switch itself - they do occasionally break. A simple multimeter can tell you if the switch is operational. The run switch is supposed to start the run motor, and also powers the amp. Since you can hear notes being played it should mean that the switch is ok, as the amp does power up.</p>

If the switch checks out, and you're handy with soldering / knowledge of AC mains saftey you can disconnect the run motor (rectangle motor on the treble side of the generator) from the generator drive shaft and rig up a temporary AC plug directly to the motor and see if the motor runs.</p>

Chances are the motor is gummed up so you'd need to have it serviced, or its plain dead(?) and you need to buy a new one off ebay. </p>

Should be enough to get you started. Is it a M-100? M, M2, M3?
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[Guest]

Re: M series Tone Gen



Thanks so much, gives me a starting spot. As far as model, the tag simply says "M" Is their a way to determine the model? It has no percussion, one draw bar for bass pedals, reverb, and a sweet extention cab.</p>

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thanks again, Paul
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[bluetantra]

Re: M series Tone Gen



The original "M" was manufactured between 1949 and 1952. I have #4606, from 1949.The "M" wasthe first spinet organ, with the 44-note off-set manuals. Percussion wasn't available on a spinet until the M-3 and reverb didn't come standard on the spinets until the M-100 series, although Hammond did market add-on reverb setups with and extension speaker. The serial number and the Hammond Age Determination List over at Tonewheel General will help you figure it out.</P>


http://www.tonewheelgeneral.com/agelist/agelist.php</P>

[johnny b3]

Re: M series Tone Gen



I keep hearing different things about the M, such as that it was only produced for a handful of months before the M-2 was introduced with vibrato. </p>

Or does the M have vibrato but not selective vibrato between manuals?
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[redoctoberff]

Re: M series Tone Gen

[quote user="johnny b3"]


Or does the M have vibrato but not selective vibrato between manuals?
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[/quote]</P>


That's the distinction. The few months thing confuses me too, I don't know if production went on at the same time as the M2 or what, but that would make sense if it actuallyhad a production run of a few years..</P>

[Guest]

Re: M series Tone Gen

My Model "M" does have the added reverb, and an extenton cainet. I found the following: When I removed the metal cover on the tone gen that on the left, where the run motor is, the round part to the extreeme left with soler points coming off about every 3/4 of an inch, a disconected wire(broken soder joint) what do these wires do? Have a friend coming over to soder it on Wed. Run moter still quits when I turn off start button.

[bluetantra]

Re: M series Tone Gen



Here's the service manual for your organ: http://www.archive.org/details/Hammo...delsMM2M3M-100</P>


The round part you referred to is the vibrato scanner. Well-respected tecnician George Benton has put together an excellent tutorial on servicing the vibrato scanner on his web site www.bentonelectronics.com. Click on the "Service" button and you'll find several topics he's covered. Your problem keeping the generator running is probably in the "Run" switch or the wiring associated with it and the run motor. The run motor is the squarish lookingpart between the vibrato scanner and the rest of the generator.</P>


What is the serial number on the data plate?</P>

[johnny b3]

Re: M series Tone Gen



[quote user="Poolio"]Run moter still quits when I turn off start button.
[/quote]</p>

re-read my first thread. Either power isn't getting to the motor, or it is but the motor needs service. Again, if the tubes light up when the run switch is ON, then the switch is ok. Next you want to make sure the wiring between the switch and motor are intact, and that the motor is even operational. It will probably require you to remove the motor from the assembly and have a look at it on a test bench. Unplug the organ whenever you're poking around with your best friend, the multimeter. Be safe, it can kill.
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