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 ...
