[Halld-pid] [New Logentry] TOF FADC250 in slot 8 is half-broken

[ostrov at jlab.org]

Logentry Text:
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FADC250 in ROCTOF1 slot 8 seems to be broken.

In CSS TOF scaler display, all its counts are zero. The
corresponding discriminator scalers are ok.

In mode 8 readout, its data looks like this:
 551: 82040101 - BLOCK HEADER - slot = 8   n_evts = 128   n_blk = 257
 552: 92000001 - EVENT HEADER 1 - evt_num = 33554433
 553: 9E9004D5 - TRIGGER TIME 1 - time = 009004d5
 554:       6E - TRIGGER TIME 2 - time = 0000006e
 555: A00001FF - WINDOW RAW DATA - chan = 0   nsamples = 511   ()
 556: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 557: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 558: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 559: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 560: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 561: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 562: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 563: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 564: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 565: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
...............
 809: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 810: 1B9D1B9D - RAW SAMPLES - valid = 1  adc = 7069   valid = 1  adc = 7069   ()
 811: A08001FF - WINDOW RAW DATA - chan = 1   nsamples = 511   ()
 812:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 813:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 814:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 815:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 816:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 817:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 818:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 819:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
 820:  3E603E6 - RAW SAMPLES - valid = 1  adc =  998   valid = 1  adc =  998   ()
and so on.

Note that it is only channels 0,1,2,5,8,14,15 which are stuck at some values, other
channels of this FADC250 are completely absent in the data stream. The
raw data are available here:
/gluonraid1/Users/hdtofops/DATA/hd_rawdata_000070_000.evio

On a relevant note, attempts to run TOF cosmic DAQ recently resulted in a number
of hard crashes of ROCTOF1 (to the point of no response to network ping and
roc_reboot as the only option). I don't know if this is somehow related to what
this bad FADC250 is doing.


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