26-June-2003, dips on CFTX8, 6A5: SVX0 board 557

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26-June-2003, dips on CFTX8, 6A5 SVX0 board 557
Dips to left of fiber 1000 SVX 1-7 on 6A5
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26-June-2003, dips on CFTX8, 6A5 SVX0 board 557
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26/27-June-2003, dips on CFTX8, 6A5 SVX0 board
557

• Dip seen in vertex examine in phi distribution
  for hit on tracks in layer 16-cftax8
• This dip corresponds to 6A5 SVX0

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26/27-June-2003, dips on CFTX8, 6A5 SVX0 board
557

• Pdaq examine shows problems for hdi125, this is
  indeed 6A5.

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26/27-June-2003, dips on CFTX8, 6A5 SVX0 board
557

• Pdaq examine shows problems for hdi125, this is
  indeed 6A5

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Boards in VRB12 got re-calibrated, RMS of
  pedestals for 6A5 increased compared to previous
  calibration run, SVX0 has badly split pedestals.
• During first two hours after calibration vertex
  examine spectra were okay and pdaq examine did
  not show any problems for hdi 125 (board 6A5),
• However pulse height distributions show problems.

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6A5 Pulse Height DistributionsZero Suppression On

• These spectra are from SDAQ run with zero
  suppression on

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26/27-June-2003, dips on CFTX8,6A4, board 508

• 6A4 is bad to, this is SDAQ with zero suppression
  on..

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Pulse height distributions for 6A5 when pdaq did
  not show any problems. Clearly demonstrates that
  we do not detect this serious failure!

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Hit maps look bad for SVXs and discriminators

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26/27-June-2003, dips on CFTX8, 6A5, board 557

• Vertex examine view of problems with 6A5

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Pulse height distributions look awful for 6A5 in
  cft_examine, good for 6A4 examine

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Some time later is event worse

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• On Saturday morning it looks awfull

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26/27-June-2003, dips on CFTX8, 6A5 bboard 557

• And corresponding hit map

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26/27-June-2003, dips on CFTX8, 6A5 board 557

• Pdaq errors in detail

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28-June-2003, dips on CFTX8, In 6A5 new board 469

• With new board the spectra even worse. Swapping
  did not fix the problem.
• In next access the same day we swapped sequncer
• We swapped VRB too

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Problems with read-out of board 6A5

• We tried so far
• Removed board 557 and installed board 469
• We swapped sequencer card
• We swapped VRB
• Problem is intermittent
• Last night board was okay
• Last afternoon board was bad
• Short 20 min access today
• Re-rout cable so 6A5 read-out via gray cable
  and seqencer of 6A3

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FEB crashing SBC
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FEB crashing SBC
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Bayonet out/in 8A7, June-28 7AM
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Bayonet out/in 8A7, June-28 7AMfixes temperature
read-back
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Temperature read-back on 8A7 is fixed