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    User name R. Michaels

    Log entry time 11:18:03 on October13,2004

    Entry number 134046

    This entry is a followup to: 134035

    Followups:

    keyword=T1 repair: hot crate, bad module

    Took access to R-HRS. Traced the loss of T1 trigger to a module
    P/S 758 (left one of two units that feeds a P/S 757) used for "or"
    of S2 which is required for T1. Swapped module for two 755 units.
    T1 ok again.

    The modules in this crate were extremely hot. Unfortunately the
    fan unit was off ! I turned it on. This may make you wonder how
    many other modules in that NIM crate are "fried". It is the top NIM
    crate at bottom of rack RR1 (just below the HV).

    The power supplies on the NIM crate was checked and is ok.
    S2 signals look ok in scalers. And T1 ok again, as I said.

    One thing that slowed me down is there were no spare P/S 758 (nor
    P/S 757) in the "spares" cabinets. We used two P/S 755 units
    instead (logically equivalent to one 758). We had to hunt for
    those units as well (no spares). Clearly I need to buy more spares.