[GreenKeys] Teletype M32 ASR printing.. then blowing fuses

[Andy KN4UCL]

Evening GK folks - I was doing a bit of printing this morning from iTelex,
and after a few minutes it powered down on its own, followed by a mild
plasticky burning smell. The fuse (labelled with green arrow) was blown.
It's a Littelfuse 313 AG 3A 250V.  I ordered some replacements on the
ebays. But just for fun I tried a 3A fast blow fuse, which popped
immediately upon power up. I then got super brave and tried a 4A fast
fuse... which also did a feeble flash and then died. Not brave enough to
try a 5A 🙄😀

Any idea on what's upsetting this fuse?  I also ordered some spare 3/8A
fuses (the right hand fuse) as this *looked* blown (seemed kinda cloudy)
but actually did not blow.  Maybe it's on its way out?

Motor turns freely by hand, if that has any bearing on things.

Anyway... your thoughts appreciated as ever! 😃
cheers....Andy
[image: mail.google.jpg]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230814/1b8fb0cf/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: mail.google.jpg
Type: image/jpeg
Size: 308674 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20230814/1b8fb0cf/attachment.jpg>