On 12/08/2017 19:35, Al Kossow via cctalk wrote:
the black one in the lower left

it is a tantalum, which are known to short, try removing them


Yes ! It was this one that was shorted !
I decided in the same way to repair the second disk drive but this time by taking some pictures.

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair01.jpg

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair02.jpg

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair03.jpg

First, I desolder the same capacitor as on the first drive

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair04.jpg

but ...

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair05.jpg

Damn, it's not the same faulty capacitor ! Fortunately by checking the next one on the path of the + 24v

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair06.jpg

There you are !

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair07.jpg <http://www.zeltrax.com/classiccmp_forum/uts40/8406repair07.jpg>

Since, I reassembled the beast, everything seems to be OK on the subsystem side, he's ready to follow the instructions of the UTS 40 !

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair08.jpg

http://www.zeltrax.com/classiccmp_forum/uts40/8406repair09.jpg <http://www.zeltrax.com/classiccmp_forum/uts40/8406repair09.jpg>

When I think that somewhere on the CPU board of the computer it is perhaps a simple component like that capacitor which is the cause of this breakdown since 17 long years ...


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