That picture reminds me of a telephone answering machine which mysteriously failed.
Upon taking it apart, I found out why it was keeping the telephone line busy all the time. The board had a big carbonized burned spot on it much like your picture shows. Apparently, as far as I could tell, there was a cockroach in there sitting across the traces just when a lightning strike hit. It fried the roach across the phone line conductors and burned the board black. (oh the joys of living in the Florida swamp!) It was a simple repair. I scraped the fried roach remains off, and then went about carving down between the traces with an exacto knife until I hit virgin board material. Ohmed it out until is was open again, and afterwards it worked ok. Chuck > > >---- Original Message ---- >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: RE: [neonixie-l] V400 carnage >Date: Sat, 19 Apr 2014 15:05:50 -0700 > >>This clock had a hard life. The PC board was baked from the >transistor overheating. There was also a carbonized spot to the left >of the transistor, where the far end of the rectifier diode pad was >placed very close to the transistor, with a ground plane in there >too! 0.5mm spacing between traces with 200VAC on them. I don't know >which was the chicken and which the egg. >> >> $4.95/mo. National Dialup, Anti-Spam, Anti-Virus, 5mb personal web space. 5x faster dialup for only $9.95/mo. No contracts, No fees, No Kidding! See http://www.All2Easy.net for more details! -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/380-220144619234211783%40all2easy.net. For more options, visit https://groups.google.com/d/optout.
