[GreenKeys] ASR 33 motor buzzing

[drlegendre .]

Brad,

If you're going to have to pull the motor to swap it anyway, why not pull
it now and try running it on the bench - with only the minimum required
components (relay, cap, etc.) and no load on the shaft? You can power it
from a variac, and watch what the current does during start & run phases.

It will also give you a good opportunity to measure the resistance of the
various motors windings, uninfluenced by the rest of the circuitry. I don't
have a 33 motor, but I bet Wayne would be able to quote you some reference
readings. If there's a bad or shorted winding, it should show up in a DC
test - though not 100%.

-Bill

On Sun, Oct 23, 2016 at 6:53 PM, Roy Morgan <k1lky68 at gmail.com> wrote:

> Brad,
>
> You may simply have a bad motor run capacitor.  Check that there is one (I
> dont know but suspect there is) and replace it.  If it is open (the likely
> failure mode) then the motor won't run.
>
> Roy
>
> On Thu, Oct 13, 2016 at 9:15 PM, Brad via GreenKeys <
> greenkeys at mailman.qth.net> wrote:
>
>> Okay so I think I may have a dead motor on my hands.  When I power my ASR
>> on I hear a loud buzzing, and I can hear and feel it coming from the main
>> motor.  However if I manually turn the motor shaft (clockwise), everything
>> in the Teletype seems to move as it should, it’s not seized.  After a while
>> it will blow the 2A fuse nearby.
>>
>>
>>
>> Would that about be the right diagnosis?  Can the motors be rebuilt?
>>
>>
>>
>> If anyone else has any other suggestions on stuff I can try, I’d be most
>> appreciative.
>>
>>
>>
>> B
>>
>>
>>
>>
>>
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>
>
>
> --
> Regards,
> Roy
>
> Roy Morgan
> k1lky since 1958
>
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