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Nancy Golden
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Platinum
Re: They can't both be bad
Nancy Golden   10/24/2012 12:32:00 PM
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I agree, Rob - since part swapping is usually a quick way to verify if a part is operating correctly. I would also have been tempted to call the cable good and look further for a different problem. I have done it in the past (just grabbing another part out of a parts bin) and after wasting time verifying everything else was okay, I would return to the part I had called "good" and finally figure out that while it was not the obvious answer, the replacement was also bad. Glenn did a great job going to a KNOWN good cable to make his call - a great tip for anyone involved in troubleshooting!

Rob Spiegel
User Rank
Blogger
Re: They can't both be bad
Rob Spiegel   10/24/2012 11:00:11 AM
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Good point Naperlou. Glenn will likely weigh in on this. If the cable was new but defective, you would get a powerful bias that the cable wasn't the problem.

naperlou
User Rank
Blogger
Re: They can't both be bad
naperlou   10/24/2012 10:35:01 AM
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Glenn, that was good work.  I always found that there are often several different failure modes and it is important to isolate them.  The problem with the second cable is a difficult one.  I wonder if that cable was considered "new" or if it was a spare from another unit.

Rob Spiegel
User Rank
Blogger
They can't both be bad
Rob Spiegel   10/24/2012 5:56:05 AM
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Good detective work, Glenn. When the replacement cable was also bad, it would have been easy to determine that the cable wasn't the problem.

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