View page
Talk page

06 June

Modified 16:16, 26 Jun 2013 by horneff | Page History

    Version as of 16:11, 18 May 2024

    to this version.

    Return to Version archive.

    View current version

    2013 June 4

    One disc in lofarB1 broke apparently late on June 2nd,  disk was replaced by Effelsberg personel, computer is offline. (OS needs to be re-installed.)

     

     

    2013 June 07

    JMA

     

    LBA: 

    RCUs 70 and 106 are broekn (flat response as if lying down)

    RCU 74 has weird spectrum

     

    HBA:

    RCUs 54,55 have bad spectra

     

    Report from Henri Muelman at ASTRON

    E-Mail_Henri_Meulman

    2013 June 17

    lofarB1 has been re-installed on June 14th.

    During the re-install it happened that the ethernet-interfaces were assigned incorrectly: one of the (unused) 10 GBit interfaces was configured as eth1, but as it isn't connected to the LOFAR-switch it cannot be used for data recording.

    The correct assignment is:

    eth0 (first 1 GBit): HWaddr=00:19:99:ba:42:ca

    eth1 (second 1 GBit): HWaddr=00:19:99:ba:42:cb

    Both 10 GBit interfaces (HWaddr=00:19:99:bc:7e:64 and HWaddr=00:19:99:bc:7e:65) are currently unused.

    2013 June 25

    1st day of maintenance visit

    Henri Meulman from ASTRON visited, Klaus Schlich, Andreas Horneffer, and James Anderson helped with maintenance.

    IIRC (meaning I may have missed stuff, AH) the following was done:

    • replaced one HBA FE module (tile 54 (RCUs 108/109), element 9)
    • tightend several connectors in HBA tiles (among others in tile 9 (RCUs 18/19), element 15)
    • removed corrosion from several connectors in HBA tiles (among others: tile 9 (RCUs 18/19), element 16)
    • taped up LBA cables to prevent (more) water from getting into the cables: RCUs 150/151 (LBA 75), RCUs 108/109 (LBA 54)
    • replaced part of the cable to LBA 34, RCUs 68/69, see below:

    Both cables to LBA 34 (RCUs 68/69)  were cut into, on the X-cable the cut went all the way to the center core (see first image)