Took the second one out. It is labeled TVR07241, which is a 240v
varistor! I can get these to replace them.
I think this one is undamaged (at least, it isn't blown up or shorted).
I wonder if the other one was a 115V one which was only in the circuit
when the switch was set for 115. That would certainly explain it blowing
when I plugged it into 230!
On 9/9/14 8:41 PM, Fred Townsend wrote:
Vic: Sorry you passed the smoke test. Your mystery components sound
like transient suppressors. They are not needed for normal operation.
They are there to suppress lightning or other power line
disturbances. To find out carefully cut out ZNR1&2 and clean up any
ashes. Then replace the fuse and try the computer. If you are lucky
the computer will run. Don't forget to change back to 120 VAC
setting.
Good luck, Fred, AE6QL
-----Original Message-----
From: "Vic, K2VCO" <k2vco....@gmail.com> Sent: Sep 9, 2014 10:23
AM To: Elecraft Reflector <elecraft@mailman.qth.net> 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.
-- Vic, K2VCO/4X6GP Rehovot, Israel http://www.qsl.net/k2vco/
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--
Vic
--
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/
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