ASR 33 buzzing

Brad H vintagecomputer at
Thu Oct 13 18:37:04 CDT 2016

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] On Behalf Of Paul Koning
Sent: Thursday, October 13, 2016 4:28 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at>
Subject: Re: ASR 33 buzzing

> On Oct 13, 2016, at 7:14 PM, Brad H <vintagecomputer at>
> 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.


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