[time-nuts] HP10811-60111 oven failure + repair of *thermal* fuse

J. L. Trantham jltran at att.net
Mon Oct 31 09:09:36 EDT 2011


Achim,

As luck would have it, I found the HP parts I ordered to replace my dead
thermal fuse.

It is P/N 10811-80008 and is labeled 'FUSE - THERMAL 115C'.  So, you may
have hit it exactly.

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Achim Vollhardt
Sent: Monday, October 31, 2011 2:21 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] HP10811-60111 oven failure + repair of *thermal*
fuse

Fellow Time-Nuts,
the polyfuse was finally replaced now with a thermal fuse. The closest I 
got my hands on was 115degC. Fits nicely and oven is heating up again :)

Pictures are updated (well, the last picture at least.. just for reference):

http://gulp.physik.uzh.ch/HP10811_oven-repair/


Regards,
Achim

> Fellow Time-Nuts,
> first of all thank you for all the feedback and advice.. especially
> about the mistake of putting in a current protection rather than a
> temperature protection. I mislead myself into using a polyfuse as these
> work thermally as well :( That said, 'Shera' locked immediately again
> yesterday evening so the basic functionality is restored.
>
> Oh well, I know now how to open the can and my local component supplier
> has some 105degC-ish thermo switches on stock which even look very
> similar to the one installed.. to be done next week :) Photos will be
> updated afterwards. Some folks even advised to bridge the fuse, but I
> believe that this very fuse does have its justification. At the end of
> the day it's only another hour or so of work.
>
> Regards,
> Achim


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