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User name Jack (Techs)
Log entry time 05:42:41 on January 25, 2009
Entry number 257715
Followups:
keyword=Fastbus
The lower Fastbus crate was running hot. I removed the filter, it was
pretty clogged up. The -2V supply could not be adjusted above -1.85V and
was emitting a high pitched whine. It was replaced. All the voltages on
this crate and the one above it were checked and adjusted to the nominal
values. The voltages seemed stable on the DMM I was using. The thresholds
to the wire chambers were at 0V. The thresholds were set and the crates
ran without rebooting.
The power cord on the CAMAC crate was the original cord. It was in very
bad shape. I replaced it with a smaller gauge cord. If I trust the
display on the AC power distribution unit, the crate is only drawing
about 4 amps. Things should be ok. When I looked at it, the original cord
was cool to the touch. The replacement cord also seems to be operating
cool to the touch. Perhaps the original cord developed a bad contact on
the plug and began to overheat. If it was making intermittent contact
perhaps this caused the fuse to blow. We will have an opportunity on
Tuesday to look at it more closely. For now, keep an eye on it.