[Elecraft] Help! Rescue me from stupid error!

[Vic Rosenthal K2VCO]

Thank to everyone who responded to my cry for help after I damaged my 
computer PS. I replaced the MOVs and the fuse and it works!
I do not recommend running 120v equipment on 240v in general!

On 9/9/2014 12:38 PM, george fritkin via Elecraft wrote:
> There is nothing mechanical about a ZNR.  The electrical equivalent is back to back Zener diodes with a capacitor.  Some people call them Transzorbs or MOVs to get by trade marks.  The ZNR is a Panasonic trade mark
>
> George, W6GF
>
>
> On Tuesday, September 9, 2014 10:54 AM, "Charlie T, K3ICH" <pincon at erols.com> wrote:
>
>
>
> A 'ZNR" is a Zinc Oxide non-linear Resistor.  It is the mechanical
> equivalent of a Zener Diode.  It is a bidirectional (AC) device that will
> conduct when a certain level of voltage is applied across it.  They don't
> typically have as sharp a "knee" as a real Zener, but are very effective for
> what they do.  Basically , a voltage surge or transient  protector.
> Hopefully, they worked but are probably blown and should be replaced.
>
> As for the rest of the stuff, I'm sure you'll find some more (inexpensive)
> things to replace and the system will come back to life.
>
> Good Luck on the repair, Charlie k3ICH
>
>
> ----- Original Message -----
> From: "Vic, K2VCO" <k2vco.vic at gmail.com>
> To: "Elecraft Reflector" <elecraft at mailman.qth.net>
> Sent: Tuesday, September 09, 2014 1:23 PM
> Subject: [Elecraft] Help! Rescue me from stupid error!
>
>
>> 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.

-- 
73,
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/