Ah yes, the enemy of all electronic devices: Heat and vibration! Yep, it
lead to the failure of many a zenor diode on Lucas electrical systems.
RHB
"Michael S. Macdonald" wrote:
>
> RHB...you were looking for a replacement fan for a PCPro a while back if
> memory serves.
>
> I also had one fail on my original PCP. Recently I've been building up
> another and was having a problem with the unit freezing up randomly,
> sometimes after it had been perfectly stable for a long while.
>
> I put it down to a cache or ram glitch, but replacing those components with
> known good bits didn't seem to cure it.
>
> A while back, while I was fiddle farting around with it, I noticed an odd
> vibration, and traced it back to the CPU fan.
>
> The fan was operating normally, it seemed, but a light went on due the
> earlier fan failure.
> I pulled the fan and compared it with another...it vibrated noticibly while
> the other did not
> As the fan is mounted on the carrier which also holds the CPU card steady,
> it appears that the vibration may have triggered the odd and random freezes.
>
> Powercomputing owners might remember this note when troubleshooting.
>
> Cheers...Michael
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