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" <[email protected]>
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" <[email protected]>
To: "Elecraft Reflector" <[email protected]>
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/
______________________________________________________________
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]
