Hi,Typically a device labeled as znr is a MOV, metal oxide varistor used to protect cir u its from excessive voltage or currents. Remove the other one, you will probably find a marking. 73s Tom va2fsq.com
On 9/9/14, "Vic, K2VCO" <[email protected]> wrote: > I just did one of the dumbest things I've done since I tried to swim across > the Susquehanna river with all my clothes on. I survived that, but I need > help with something else. > > I just turned on a computer plugged into 230v with the switch on the power > supply set to 115v. Result: bang, smoke, house breaker (16a) pops. > > I took the power supply apart (it is a funny size so I have little confidence > I could replace it). I found two obviously bad components: 1) an 8a fuse -- > no problem. 2) something marked znr1 on the board, a component wrapped in > heatshrink tubing. It was completely destroyed. Next to it is a similar part > labeled znr2. I haven't removed it yet -- so I am not sure it is good. It > might be the same as the first one and it might be marked under the > heatshrink. > > There is a bridge rectifier nearby which checks good. All traces look ok. I > am hoping there is someone out there who is familiar with these supplies who > can suggest what these are (zener diodes? What voltage?) > The board is made in such a way that it is difficult to trace the wiring -- > but these parts are right near the power input. > > -- > Vic, K2VCO/4X6GP > Rehovot, Israel > http://www.qsl.net/k2vco/ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] <[email protected]> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
