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Re: (ET) E-12 Charger trouble

Actually... I have direct replacement diodes available :-)
And complete heat sink/diode assemblies.
As this comes up from time to time, I will add the loose diodes to my web site (some seem to take what the computer says too literally... I have tons of stuff not yet listed). However, it is tricky to just replace the original diodes as after pressing out the old ones, the aluminum tends to be stretched and then the new ones are loose. Thus why I sell the complete assemblies, new aluminum with with new diodes already pressed in.
I have two types of diodes, both press fit, both new, as in manufactured recently enough to be ROHS compliant (lead free). One kind has a wire lead just like the original and identical current rating to the original. The second kind has a lug with a hole and is has double the current rating. The complete heat sink assembly is made using the heavy duty diodes.
All that said, the capacitors are more likely than the diodes to have a loud/dramatic/explosive failure. Either failing could could pop the breaker. 


On 5/8/12 9:25 AM, Chad Bush wrote:

Bill,

Sounds like either your capacitor shorted and/or one or both of the
diodes broke down. Direct replacement diodes are very hard to find, but
you might be lucky enough for Harold to have a new diode heat sink.
Otherwise, you will need to find a few 1N1186 diodes that are 1/4-28
stud-mount, drill a few holes in the heat sink, and solder on a new lead
on each. I usually place them right above the old diodes so you don't
have to worry about removing them and I put insulated stake-on
connectors between the transformer and diodes so that future
replacements are a little easier. The capacitors you can get from Jim
Coates' website or Harold Zimmerman. I recommend replacing both at the
same time.

Good Luck!

Chad Bush, Dayton, Ohio


-----Original Message-----
From: Bill Alburty <willaim kc rr com>
To: elec-trak <elec-trak cosmos phy tufts edu>
Sent: Tue, May 8, 2012 8:23 am
Subject: (ET) E-12 Charger trouble


Last night, after mowing, I plugged in the charger, and when I turned
the timer knob to begin charging, a loud noise came from the charger and
it blew the 20A fuse in my house circuit. I haven't opened it up to look
yet, and haven't plugged it in again. What should I look for as the
problem? What tests should I do? The noise sounded like a big clatter,
as if the core plates were vibrating unfettered.
I appreciate all advice and speculation.

Bill Alburty, Kansas City

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