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User name spiegel
Log entry time 13:57:31 on April 12, 2007
Entry number 198749
keyword=Q1 power supply comm error
Found p/s had multiple failure conditions (pre-regulator and spare) on
Danfysik display panel, including an interlock failure on Saclay rack
controls. Tried to reset by cycling power with no effect. Tried two
different mother board changes on P/S, neither would communicate with
Danfysik control panel. During one of the installations noticed a cold
solder joint on the ISO-AMP. board assembly. Resoldered board mount
connector. Decided to reinstall original Mother board and reset again.
All faults cleared and found we had "REMOTE" control of power supply.
However, the control panel had no display or local control. Swapped out
danfysik control panel for one that was previously changed out and still
in the Hall. Powered P/S down, Installed other control panel and
everything worked fine. Note: The Iso-Amp. connector problem was
coincidental to the communications problem and not the cause.
A copy of this log entry has been emailed to: folts@jlab.org,segal@jlab.org