[GreenKeys] ASR 33 motor buzzing

Mon Oct 24 02:17:48 EDT 2016

Brad,

More importantly, do you have a variac or at least a dim-bulb tester? The
only way to test this unit is with some voltage & current limiting device
on the AC line input.

Fast / slow fuses are not the issue. Just stick some kind of fuse in it,
3-10A and - again - watch the current with the DVM as you apply power with
the variac or what have you. The point, is to get a sense of just how much
current the motor (just the motor, with caps / relays) is demanding from
the line.

Is it just being excessively demanding at turn-on, or is the thing acting
like a dead short to the line, under any conditions? Have you even measured
the DC resistance of the windings, yet? These are all very basic steps..

On Sun, Oct 23, 2016 at 11:43 PM, Brad <unclefalter at yahoo.ca> wrote:

> My problem is I have no slow fuses at all.. they’re all fast blow.
>
>
>
> I do have a DVM.. so when I get some slow blow fuses in I will definitely
> try what you suggested.  So you’re saying just put my test leads on the
> side and bottom of the fuse holder where the clips attach, fuse in?
>
>
>
> *From:* drlegendre . [mailto:drlegendre at gmail.com]
> *Sent:* Sunday, October 23, 2016 7:24 PM
> *To:* Brad <unclefalter at yahoo.ca>
> *Cc:* Roy Morgan <k1lky68 at gmail.com>; Green Keys <
> greenkeys at mailman.qth.net>
>
> *Subject:* Re: [GreenKeys] ASR 33 motor buzzing
>
>
>
> 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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