Thanks Martin and Paul, pretty much what I thought

> IME, since the fuse is not blown it was most likely a bad solder
> joint at manufacturing
> 
> > Would be interested in opinions before I stick any power up it. Oh,
> > and the owners of the powered device are bigger than me
> 
> How much bigger? :-)

Well, not big enough to get your address

> but seriously, if I wanted to be extra careful I'd fix the joint then
> replace the fuse with a 500mA part. Then watch the fuse during
> power up, if it dies violently I'd be cautious and check out the
> rest of circuit carefully. If a 500mA fuse blows without big sparks
> then I'd try the 800mA fuse

That sounds a good safe strategy (or "stragedy" if it kersplodes - don't
care too much for working on switchmodes)

Now, can you re-phrase your answer so it sounds like it was my idea ?

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