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    User name folts

    Log entry time 21:36:43 on July 04, 2007

    Entry number 207593

    keyword=tech Q1

    Called in for unresponsive Q1 with slow ramp down.

    Little or no control of power supply in local or remote.

    Turned off power supply from computer

    Set current to 0

    Turned on power supply from computer and current ramped to 450amps with set current at 0

    Turned off power supply from computer de-powered power supply at stop switch and disconnect and re-powered.

    Cleared faults locally and turned on power supply locally.

    Power supply began ramping with no input (set current at computer still at 0)

    Turned off power supply and set it to remote

    Turned on power supply remotely and current began ramping with set current at 0.

    Turned off power supply

    Noted no red lights on mother board, jiggled D connector on back of control board.

    Restarted power supply and it works normally accept for a 7.5 amp offset between set current and power supply current.

    I also noted that there are no spare control boards or mother boards in the drawer



    A copy of this log entry has been emailed to: fansler@jlab.org,