According to sources, a MOV in the base unit can overheat and could lead to a fire. This particular fault would indeed be consistent with the fault only occurring at the upper end of the supply voltage range. If I had to speculate, I would suggest that the MOV’s operating voltage had either been under-specified or a batch of MOV’s are out of spec. Either way, leading them to partially conduct at the upper end of their intended operating range and get hot. T ----- Original Message ----- From: John Woodgate Sent: 12/07/12 06:19 PM To: [email protected] Subject: Re: [PSES] interesting recall by CPSC
In message <[email protected]>, dated Fri, 7 Dec 2012, Brian Oconnell <[email protected]> writes: >Direct hit, Mr Woodgate. That was point of purpose of my OP. > >This is not the typical recall of cheap consumer goods from an Asian >manufacturer. These people generally know how to design and make safe >stuff. It may be due to the sort of fault that can't reasonably be simulated or what I originally suggested about the loudspeaker. On the other hand, even Homer (no, not Simpson!) was alleged to nod. -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk The longer it takes to make a point, the more obtuse it proves to be. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archiv! ed and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
