RE: [CAD_CAM_EDM_DRO] How do I check the MOSFET's in my stepper driver

Did you blow the fuse or did the fuse blow!!

If you caused a short circuit and blew the fuse it is possible that you
have damaged one of the transistors (fet), but it is also possible that the
fuse wire got tired and just could not take it any more and simply gave up,
in which case replace it and continue.

Examin the fuse if it is glass body if the fuse wire has been totaly
vaperoised look for further faults if it is still there but broken replac
it and continue.

roger


Original Message:
-----------------
From: washcomp jeff@...
Date: Wed, 23 Feb 2005 12:15:59 -0000
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] How do I check the MOSFET's in my stepper driver




I blew a fuse in my API CMD-260 stepper driver. Before I put it back
into my CNC mill, I'd like to make sure that one of the MOSFET's
didn't blow and cause the fuse to go. How would I test them without
de-soldering? (I didn't find any consistancy in resistances with my
ohm meter, probably because of external circuitry or interconnection
between them). There are ten of them in there.

Or should I just change the fuse and hope for the best?

Jeff





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