Subject: ERP S/H module 5E01/02/03/04 fixed
Ioanni.Katsavounidis@lngs.infn.it
Date: Sun Dec 26 1999 - 08:39:26 EST
Ciao a tutti,
Sometime during run 18811 (25-DEC-1999 -> 26-DEC-1999), ERP S/H
module 5E01/02/03/04 broke. It resulted dead for ERP-mu and ERP-gc
during run 18812 and also run 18813, which we stopped at ~ 1h 45min
in order to fix the module. Run 18814 started without uVAX#3.
The module gave no signs of life and the 1A pico-fuse on the -12V
line (F3 on the ERP S/H schematics) was found broke and changed.
Nevertheless, the problem was not solved, since when plugged back,
the fuse broke again.
Using the "evaporation method", the component responsible for
the broken fuse was identified: a polyester 1uF cap (C42 on the
ERP S/H schematics, listed as a 0.1uF cap) that got changed. That
fixed the broken module; after a short mini-ACQ, uVAX#3 (and together
channels 5E01/02/03/04 for ERP) was put back in acquisition starting
with run 18815.
A presto,
Ioannis
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