[GreenKeys] ASR 33 motor buzzing

[Bruce Gentry]

It's been a while since I have seen a 33, but they do have a motor start 
condensor, usually mounted beside the start relay. The start relay is 
operated by the current drawn by the run winding in the motor, it picks 
when the motor is stopped and drawing high current, and drops when the 
motor is near running speed. If the fuse is too small, it will blow 
before the motor can start. Using a slow blow fuse will reduce the 
chance of needless blows. Try this- take the belt off, and be sure the 
gear driven by the motor shaft turns freely, indeed freely enough that 
you can get the motor spinning by rubbing/flicking  the gear.  Replace 
the fuse with one about twice the original's rating, it won't hurt 
anything for a few seconds. Put a piece of paper between the start relay 
contacts or disconnect the wire from the relay to the start winding, get 
the motor spinning as well as you can by hand,  turn on the power, help 
it along if needed. You can also remove the gear and wind a piece of 
twine around the motor shaft to improvise a starter like a small engine. 
A good steady pull should get the motor spinning nicely. The motor 
should start and come up to speed, and the start relay should drop out. 
If the relay drops out and the motor is running, don't worry about the 
large fuse. Let it run for a few minutes and see if it shows any signs 
of overheating. If it starts ok manually, the start condensor is 
probably shorted or something is badly mis-wired. If the motor won't 
start manually, or does start and promptly overheats (and the start 
relay never drops out), the motor probably has a short in the windings. 
These motors are rather inefficient and compact for their horsepower, 
run hot, and tend to destroy themselves.

      Bruce Gentry  KA2IVY

On 10/23/16 9:59 PM, Brad via GreenKeys wrote:
>
> I don’t think I have one.  I’ve seen pictures of motors that had it, 
> in a little holder to the left of the starter relay.  There is nothing 
> there and no provision for wiring. I have two caps where the PSU is.. 
> one near that big flat resistor, and then another behind the PCB with 
> several resistors and caps on it.  I could be wrong but I cannot find 
> any other around.
>
> *From:*Roy Morgan [mailto:k1lky68 at gmail.com]
> *Sent:* Sunday, October 23, 2016 4:53 PM
> *To:* Brad <unclefalter at yahoo.ca>
> *Cc:* greenkeys at mailman.qth.net
> *Subject:* Re: [GreenKeys] ASR 33 motor buzzing
>
> 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 <mailto: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
>
>
>     ______________________________________________________________
>     GreenKeys mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>     Help: http://mailman.qth.net/mmfaq.htm
>     Post: mailto:GreenKeys at mailman.qth.net
>     <mailto:GreenKeys at mailman.qth.net>
>
>     2002-to-present greenkeys archive:
>     http://mailman.qth.net/pipermail/greenkeys/
>     1998-to-2001
>     <http://mailman.qth.net/pipermail/greenkeys/1998-to-2001>
>     greenkeys archive:
>     http://mailman.qth.net/archive/greenkeys/greenkeys.html
>     Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>     http://comcents.com/tty/greenkeyssearch.html
>
>     This list hosted by: http://www.qsl.net
>     Please help support this email list: http://www.qsl.net/donate.html
>     Message delivered to k1lky68 at gmail.com <mailto:k1lky68 at gmail.com>
>
>
>
> -- 
>
> Regards,
>
> Roy
>
> Roy Morgan
>
> k1lky since 1958
>
>
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to ka2ivy at verizon.net

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20161023/5450e536/attachment.html>