Peter Hays wrote >> The problem that I have is that my power supply is a class II product. i.e. I do not have a true ground and also as we all know the printer is in a plastic box. <<
As usual, troubleshooting telepathically is not all that reliable, and my clairvoyance is on the blink just now, too. However... If the backshells to which you've applied ESD are on a nonconductive chassis I'd try replacing them with plastic. If you can't do that -- if, perhaps, they are used to provide a mechanical bearing surface for the I/O cables -- you might float them; connected to logic ground, the inductance of the connecting trace will detract from their ability to reduce EMI anyway, and if that's so, it _might_ not hurt to disconnect that ground completely. Indeed, it may be there the ESD accesses susceptible devices. My crystal ball is unfortunately too cloudy to do more than guess from here. Cortland Richmond This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
