RE: [OT] Diode equivalent needed - help!

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

Thanks everyone - most useful :)

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
> Alan Ainslie
> Sent: 23 September 2005 19:40
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] [OT] Diode equivalent needed - help!
>
> These are Zener diodes of 6W rating and 48V.
>
> However, they are of a specialised class of device designed to absorb
high
> current surges very quickly as a PROTECTION mechanism rather than as a
> voltage regulator.
>
> The fact that it has cooked is a sure sign of something else adrift.
>
> Try substituting a 48V zener temporarily, but if it does work, then
you
> need
> to ensure that the correct class of device (Transorbs or Transient
> Suppressors, unlikely from Maplin but easily available Farnell, RS
> orothers)
> for normal operation.
>
> Chances are that this device is used as part of the regulator /
protection
> after voltage drop from AC mains via a series capacitor.  Therefore,
> before
> doing anything else, look for a capacitor from Mains to the BAND end
of
> the
> device, and make sure that it is not short circuit.
>
> If it is, then chances are that not only the Zener, but other devices
on
> the
> low voltage side could well be damaged as well.  But worth replacing
the
> cap
> and Zener to see: nothing lost in that case.  If the Zener did it's
job
> then
> all will have been protected.
>
> Alan Ainslie
>
> ----- Original Message -----
> From: "Paul Gale" <groups@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, September 23, 2005 5:46 PM
> Subject: [ukha_d] [OT] Diode equivalent needed - help!
>
>
> Hi all,
>
> My bro has a problem with hi heating and found a burnt out diode in
the
> control panel. I need to find an equivalent to the following that can
be
> got
> from Maplin on Sat.
>
> BZW03C51 Zenner diode (glass bead type)
>
> Can anyone help find a suitable alternative?
>
> Of course, there could always be other problems on the PCB but it's
worth
> checking first :-)
>
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
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>