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    User name Kalyan

    Log entry time 06:36:00 on January 25, 2009

    Entry number 257726

    This entry is a followup to: 257715

    Followups:

    keyword=Controlled access activity to fix the BB DAQ

    There were two problems on the BB DAQ. First, there was high dead time during a production run. Remote power cycling crates did not help so I had to go to the hall to reset them manually. This could have solved the problem(it did many times) but sometime while I was fixing this the second problem occurred - something caused BigBite CAMAC crate fuse to blow(which we obviously did not noticed, as we were busy fixing the first problem). This caused all the thresholds on the wire chambers to go to zero and that lead to crazy noise in the fastbus modules. This in turn caused the automatic reboot of ROC 9 and 10 as soon as I run CODA. Initially, after talking to Bob on phone we were thinking that fastbus power supplies might have problems(as they were showing low read back on 5.2V and 2V..Jack fixed them later). Jin and I replaced the fuse on the CAMAC crate. The fuse holder is broken so we had to put something to hold it together.

    Back to production ...