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No Logic 8??? [message #80758]

Tue, 27 February 2007 14:28

excelav

Messages: 2130
Registered: July 2005
Location: Metro Detroit

Senior Member

hack.com</A></DIV>
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<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT:

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Re: No Logic 8??? [message #80760 is a reply to message #80758]

Tue, 27 February 2007 14:58

LaMont
Messages: 828
Registered: October 2005

Senior Member

st the=20
rectifier<FONT face=3D"Times New Roman" size=3D3>, the only load on =
it would be=20
from the PS components.  I would suggest also replacing the =
filter=20
cap(s) on that supply line, since it is the prime suspect in the =
PS. =20
(You may need a schematic here).  If after this,  the =
rectifier=20
starts getting too hot again the problem is likely a VR(s) on =
that=20
line. </FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><FONT face=3D"Times New Roman"=20
size=3D3></FONT></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><FONT face=3D"Times New Roman"=20
size=3D3>   </FONT></FONT><<A=20
=
href=3D"mailto:richard.lamanna@verizon.net">

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Re: No Logic 8??? [message #80762 is a reply to message #80758]

Tue, 27 February 2007 14:45

Dedric Terry

Messages: 788
Registered: June 2007

Senior Member

in message <A=20
href=3D"news:4617f977@linux">news:4617f977@linux</A>...</DIV>
<DIV><FONT face=3DArial size=3D2>Its possible, but not likely, =
especially if=20
its not a new unit, which would be more likely to have a =
defective=20
component.  Something caused a current overload through it =
to burn=20
it up.  But apparently not a direct short which would have =
blown=20
the fuse as well.  I've seen many leaky filter caps do this =
- these=20
are the large caps that filter the ripple voltage or small ac =
component=20
off the DC.  A blown voltage regulator is another likely =
suspect,=20
as far as the PS itself.  Can the PS run by itself w/o =
being=20
connected to the M80?  </FONT></DIV>
<DIV> </DIV>
<DIV>ich Lamanna" <<A=20

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Re: No Logic 8??? [message #80768 is a reply to message #80760]

Tue, 27 February 2007 16:35

excelav

Messages: 2130
Registered: July 2005
Location: Metro Detroit

Senior Member

ptions to be? Both in cards and monitors.
>
> Thanks,
> Jon
>
>I replace them frequently on different pieces of gear. Usually, the
diodes short out and take out the fuse. You can simply replace the
unit with the same type/rating. If you are concerned about heat
(which is generally what kills these in the first place) you could
epoxy an aluminum heat sink to the tops of the bridges to help
dissipate the heat.

I have replaced literally hundreds of these things and have never seen
any collateral damage from them blowing... but I definitely haven't
"seen it all"..

David.

Rich Lamanna wrote:
> Neil, Edna, couldn't the rectifier just have gone Kablooey? As you say
> it could be symptomatic of another problem but if you read my last post,
> I may have been overloading the thing. Looking at the circuit board
> carefully, I see no other browned or burned resistors, etc. Maybe I'll
> send it in, but I might try to fix it myself as it will be only a couple
> of bucks if it doesn't work. The unit was bought used from another owner
> a few years ago, on ebay, and I'm not sure if it is still under
> warrantee. I'll have to look into this. I probably know just enough to
> get this wrong, but wish me luck. I know........ I'll soon be hearing,
> "I told you so"! :-)
>
> Thanks,
> Rich
>
> "Rich Lamanna" <richard.lamanna@verizon.net
> <mailto:

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