ASR 33 buzzing
drlegendre at gmail.com
Fri Oct 14 02:13:08 CDT 2016
" I'm assuming it must be round.. although directly under the fuse is a
little black box connected to it.
I note when I plug it in on Line sometimes there's a single metallic clack
from the PSU area and sometimes it's multiple..lioe someone's operating a
The start/run caps can be tubular, rectangular or 'bathtub' shaped. Again,
this is just generic advice and I can't say which shape(s) were used by TTY
As for the one clack vs. telegraph-like clacks, that sounds an awful lot
like a relay or solenoid that sometimes acts OK, and other times, sits
there fluttering as it lacks sufficient current to pull-in or hold the
relay armature. Bad filter caps in a DC supply (to the solenoid coil..) is
classic for this.
Ever seen a one of the cheap, obnoxious 120 AC buzzers they used in old
stoves and so on, as a "done" signal? They're just an AC relay designed
such that the coil cannot hold the armature between cycles - so it just
buzzes like mad to alert you to the status of yr Pizza rolls. =P
On Fri, Oct 14, 2016 at 1:46 AM, David Collins <davidkcollins2 at gmail.com>
> You might want to try moving the keyboard forward and away from the
> operating lever that connects to it at the back right corner of the
> keyboard. If the keyboard is pushed too far back on that lever it can load
> up the mechanism and stall it.
> It will need to be re-aligned to get the keyboard working again but that
> will need to be done anyway - it's pretty sensitive to movement.
> You should be able to turn the mechanism by hand but it also may need to
> be loosened up if it hasn't been used for a long time.
> The 33 I restored blew fuses initially and I thought it had a bad start
> cap. Turns out the start cap had been removed and my unit doesn't seem to
> need it. Once I rotated it a few times and put grease here and there it ran
> If you can get it to work by turning it by hand while it's buzzing then a
> bad or missing start cap may be your issue.
> David Collins
> HP Computer Museum
> > On 14 Oct. 2016, at 4:56 pm, Brad H <vintagecomputer at bettercomputing.net>
> > I missed those somehow.. thank you. Got a lot to learn with this beast!
> > Sent from my Samsung device
> > -------- Original message --------
> > From: COURYHOUSE at aol.com
> > Date: 2016-10-13 10:30 PM (GMT-08:00)
> > To: cctalk at classiccmp.org, vintagecomputer at bettercomputing.net
> > Subject: Re: ASR 33 buzzing
> > did you get the links we sent you over
> > on the greenkeys list for sources on 33 manuals and paperwork
> > we sent you? We did not get an acknowledgment. thanks
> > Ed# www.smecc.org
> > In a message dated 10/13/2016 4:37:20 P.M. US Mountain Standard Time,
> > vintagecomputer at bettercomputing.net writes:
> > The
> > buzzing definitely seems to be coming from the motor. I put a
> > plastic
> > tool to the casing and could feel it vibrating. However, I can turn
> > it by
> > hand (clockwise) and see all the gears and striker mechanisms
> > working.
> > It did manage to work briefly yesterday.. it did kind of a
> > 'reset'. But
> > yeah.. not today.
> > -----Original
> > Message-----
> > From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf
> > Of Paul Koning
> > Sent: Thursday, October 13, 2016 4:28 PM
> > To: General
> > Discussion: On-Topic and Off-Topic Posts
> > <cctalk at classiccmp.org>
> > Subject: Re: ASR 33 buzzing
> > On Oct 13, 2016, at 7:14 PM, Brad H
> > <vintagecomputer at bettercomputing.net>
> > wrote:
> >> Posting
> > around hoping somebody might be able to point me in the right
> > direction. I tried greenkeys but no response.
> >> I have an ASR 33 I got. When I plug it in on Line mode there is
> > a
> >> clicking in the power supply area and nothing else. If I put
> > it to
> >> Off or Local, there is a loud buzzing sound and eventually a 2A
> > fuse
> >> on the back left side of the machine blows. It's like
> > something's
> >> stuck but the noise is kind of hard to pin down.
> > Wondering if there's
> >> any Model 33 experienced guys out there.
> > :)
> > Given the blown fuse I'd suspect a stuck mechanism, so the
> > motor is stalled
> > and you're getting overcurrent. Try turning the
> > motor by hand to confirm.
> > paul
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