[GreenKeys] ASR 33 motor buzzing

Sun Oct 23 22:24:09 EDT 2016

Brad,

Do you own a variac (variable AC transformer)? If not, can you quickly
wire-up a "dim bulb" tester? Do you have any way to monitor the current
into the unit - just a basic VOM / DVM with an AC 10A range?

You really do need to begin quantifying this current issue, or you're going
to keep searching for your own arse in the dark.. ;-)

Also, there is no reason to wait for the correct glass fuse. Connect the
fuse holder clips to a set of test leads, and then attach +any+ 3-6A 250V
slow fuse to the leads. Then start applying power as you watch current on
your meter. What does it do? When does the motor turn?

I simply cannot stress enough that you need to get a handle on the facts &
figures, here.

On Sun, Oct 23, 2016 at 9:02 PM, Brad <unclefalter at yahoo.ca> wrote:

> That makes sense.  I figure I’ll try a better fuse first though, just in
> case.  As mentioned the seller was able to turn it on and do a carriage
> return, which I assume would not be possible if the motor were experiencing
> the same problem there as here.  Further, the fuses themselves were old and
> one or two had visible rust inside.  In my imagining, maybe a weakened old
> fuse finally broke in transit or when I plugged it in, and my inability to
> get this thing started again has been due to using weak automotive fast
> blow fuses.  Figure I might as well try going down that road a bit before I
> start taking things apart.  I am mechanically inclined to some degree, but
> I would be lying if I said this machine doesn’t intimidate me just a little
> bit! J
>
>
>
> *From:* drlegendre . [mailto:drlegendre at gmail.com]
> *Sent:* Sunday, October 23, 2016 6:18 PM
> *To:* Roy Morgan <k1lky68 at gmail.com>
> *Cc:* Brad <unclefalter at yahoo.ca>; greenkeys at mailman.qth.net
> *Subject:* Re: [GreenKeys] ASR 33 motor buzzing
>
>
>
> 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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