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'[EE]:Replacement diode'
2001\04\03@091210 by Jinx

face picon face
A nuked diode needs replacing. It has IR D10 3A on it. I've
looked it up at International Rectifier's site but think it's too
old. Some Dxx diodes I found in a substitution book are
similar to the 1N4xxx series, but can't see the one I want
to replace. Anyone know ?

TIA

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2001\04\03@185219 by David Duffy

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Jinx wrote:
>A nuked diode needs replacing. It has IR D10 3A on it. I've
>looked it up at International Rectifier's site but think it's too
>old. Some Dxx diodes I found in a substitution book are
>similar to the 1N4xxx series, but can't see the one I want
>to replace. Anyone know ?

What's it out of? Might be able to suggest a likely replacement
if you can tell us what part of the circuit it's from & size too.
Regards...

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2001\04\03@203819 by Jinx

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> What's it out of? Might be able to suggest a likely replacement
> if you can tell us what part of the circuit it's from & size too.
> Regards

It's part of the PSU in an amplifier protection circuit. Same
size as a 1N400x, more than likely that's what I could use
as a replacement but wanted to check that it's not something
more exotic than a rectifier and avoid more problems

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2001\04\03@230735 by Jim Paul

picon face
Jinx,

Does the manual you've been getting the LCD information from have
any specs or information on the backlight inverter?   Specifically I'm
looking for the pinout and the primary voltage to be applied.   I've tried
hooking it up the way I thought it should be, but nothing at all happened.
The lights didn't light, and the smoke is still safe in all the components
on the board.  This is unusual.   Most of the time I hook something up the
way I believe it should be hooked up, it either works, or all the smoke
escapes from several components.    Anyway, just wondering.  Let me know.

Thanks again.



Regards,


Jim

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2001\04\04@044032 by Roman Black

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Jinx wrote:
>
> > What's it out of? Might be able to suggest a likely replacement
> > if you can tell us what part of the circuit it's from & size too.
> > Regards
>
> It's part of the PSU in an amplifier protection circuit. Same
> size as a 1N400x, more than likely that's what I could use
> as a replacement but wanted to check that it's not something
> more exotic than a rectifier and avoid more problems


I believe it's a recitifier for the +/-15v rails,
these are a typical silicon rect diode (black plastic)
I use 1N4007 1A which I buy in quantity for these
situations. The larger diodes I replace with 1N5403
3A which I also buy in bulk.

Is there another one you can test? It's not a zener is
it, especially if they show heat damage.
-Roman

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2001\04\04@065834 by Jinx

face picon face
> > It's part of the PSU in an amplifier protection circuit. Same
> > size as a 1N400x, more than likely that's what I could use
> > as a replacement but wanted to check that it's not something
> > more exotic than a rectifier and avoid more problems
>
> I believe it's a recitifier for the +/-15v rails,
> these are a typical silicon rect diode (black plastic)
> I use 1N4007 1A which I buy in quantity for these
> situations. The larger diodes I replace with 1N5403
> 3A which I also buy in bulk.

A friend in town was "pretty sure" they are rectifiers, and
wouldn't you know it, because they were showing so much
heat damage, I replaced them with...1N5403s (some of that
caution and over-engineering you so frequently advocate seems
to be rubbing off). Even with one blown the protection circuit still
worked before. Without a schematic it's hard to say why, and time
is too short at the moment to draw a circuit from the board. You
know what those old Japanese amps are like, wires going off
everywhere, could take an afternoon

> Is there another one you can test? It's not a zener is
> it, especially if they show heat damage.
> -Roman

Don't think so. The cathodes are connnected, each anode goes
to a winding on the power tx. The PCB isn't silk-screened for
components

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2001\04\04@113024 by Roman Black

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Jinx wrote:

> > Is there another one you can test? It's not a zener is
> > it, especially if they show heat damage.
> > -Roman
>
> Don't think so. The cathodes are connnected, each anode goes
> to a winding on the power tx. The PCB isn't silk-screened for
> components


When each anode goes to a winding like that is sounds
like a simple full wave centre-tap rectifier. I guess
it powers the "de-thump" of the amp, so the rectifier
has to complete charging a cap before the amp output is
connected.

If one diode was O/C it would still provide de-thump,
just would take longer to charge the cap before the
protect relay clicks on and connects the speakers.
-Roman

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