18 Feb
2010
18 Feb
'10
5:53 p.m.
From: wh.sudbrink at verizon.net
To: cctalk at classiccmp.org
Subject: Deep fried inductor...
Date: Thu, 18 Feb 2010 11:50:23 -0500
---snip---
Inductors are a weak area in my electronics knowledge. How would
you know for sure that one has failed? Does it fail open?
Other info: When the drive fails, it can not read any data and,
when seeks are attempted on it, it sounds "funny", not the nice
sharp click it makes when operating correctly. The inductor does
not feel hot to the touch when the drive has failed. I'm out of
cool spray. Tonight I will try to apply an ice cube in a plastic
bag to it to see if that gets it out of failure mode.
Finally, assuming it is the problem, what do I need to replace it?
The stripes on it are:
Wide silver (covering one end)
Red
Yellow
Brown
Gold
Thanks,
Bill
Hi
The inductor is most likely a PS filter the analog paths. Although, I'd
measure it in a bridge before replacing it, it is most likely not the
problem you are seeing. As a filter, it is unlikely to cause too much
problems if short, as these circuits are often over designed there.
They rarely are temperature sensitive at the level you are seeing.
If it is not getting hot, it is unlikely to be effected by operation time.
It is more likely something failing in the stepper control. You might
also check to see if things are well lubricated ( no old grease ).
Dwight
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