[GreenKeys] ASR 33 motor buzzing

Mon Oct 24 22:51:09 EDT 2016

"There is no start capacitor on the 814 motors, just the start relay."

Thank you for (again) clarifying that. So that's good news, one more thing
not to worry about.

@Brad

So it's kinda down to the motor and the starting relay, then.

Basic relay terminology: A typical relay is composed of a frame, a solenoid
/ coil and an armature (the moving part). The frame serves as a mount for
the solenoid, and bears one or more +fixed+ contacts. The armature bears
one or more +moving+ contacts. The solenoid coil can be spec'd to power
from any given voltage and/or frequency.

For a relay to operate correctly, two primary conditions must be met: The
armature must both respond correctly to the application of power to the
coil, and the contacts must have adequate capacity to switch the required
voltage & current (they must not be fouled, bent, burned or worn-out).

A relay's configuration is denoted just as with any switch. As with a
common switch, a relay may be SPST, SPDT, DPDT, 4PDT and so on, any number
& combination of poles & states.

On Mon, Oct 24, 2016 at 10:18 AM, <teletypeparts at comcast.net> wrote:

> There is no start capacitor on the 814 motors, just the start relay.
>
> Wayne
>
> ------------------------------
> *From: *"Brad via GreenKeys" <greenkeys at mailman.qth.net>
> *To: *"Roy Morgan" <k1lky68 at gmail.com>
> *Cc: *greenkeys at mailman.qth.net
> *Sent: *Sunday, October 23, 2016 9:59:50 PM
>
> *Subject: *Re: [GreenKeys] ASR 33 motor buzzing
>
> 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> 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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