Test of 2 randomly choosen FECs with power regulator replaced

FEC1  power regulator replaced
      tested OK 
      file: combined-fec1_20100805.pdf

FEC52 power regulator replaced
      tested OK
      file: combined-fec52_20100809.pdf

LUND FECs
=========
FEC3  previous error:
      chip 5 - all channels 0
      pulses seen but low amplitudes -> negative "pedestal"

      new test error:
      chip 5 - all channels 0
      pulses seen but low amplitudes -> negative "pedestal"
      files: fec3-20100805-0-0-2500.gif, fec3-20100805-0-0-2500-pulse.gif

      correct chip (5) replaced.
      power regulator replaced

FEC5  previuos error:
      channels 48-64 (chip 3) pedestals <= zero
      pulses seen but low amplitudes -> negative "pedestal"

      new test error:
      channels 48-64 (chip 3) pedestals <= zero
      pulses seen but low amplitudes -> negative "pedestal"
      files: fec5-20100805-0-0-2500.gif, fec5-20100805-0-0-2500-pulse.gif

      correct chip (3) replaced.
      power regulator replaced


FEC7  previuos error:
      1.5V is 1.33V when 2.5V in, shutdown of PCA16 -> 1.49V
      channel 11 high pedestal/rms (chip 0)
      channel 12-15 low pedestal/rms

      new test error:
      1.5V is 1.33V when 2.5V in, shutdown of PCA16 -> 1.49V

      1.5V is 1.49V when 2.7V in
      power regulator NOT replaced

      files: combined-fec7_20100805.pdf, combined-fec7_20100806-2.7V.pdf


FEC38 previous error
      1.5V is 1.0V, shutdown of PCA16 -> 1.49V 0.50A
      new test OK    

      file: combined-fec38_20100806.pdf
      power regulator replaced
      chips 0,1 replaced

JAPAN FECs
==========

FEC12 previous error:
      2.5V in -> 0.87 V to PCA16 (0.86A)
      bad channels: 4,6,7,9,26,33-36,37-47,55,57,58,60-64,66,67,69-73,75-77,93,94,97,100-103,
      105,107-110,127
       
      new test error
      2.5V in -> 1.41V to PCA16
      2.7V in -> 1.46V to PCA16

      file: combined-fec12_20100809.pdf
      no bad channels seen
      power regulator NOT replaced

FEC80  previuos error:
       2.5V in -> 1.01 V to PCA16 (0.86A)

       new test error
       2.5V in -> 1.36V to PCA16
       2.7V in -> 1.39V to PCA16

      files: combined-fec80_20100809.pdf, combined-fec80_20100809-2.7V.pdf
      no bad channels seen
      power regulator NOT replaced

NOTE: the voltage input to PCA16 was not forced to 1.5V

Conclusions from these tests
============================
change of power regulators OK

Lund:
FEC3 and FEC5 still bad

FEC7 still suspect with too low voltage to PCA16, no bad channels seen
     remains to change power regulator

FEC38 is OK

Japan:
FEC12 and FEC80 still suspect with too low voltage to PCA16, no bad channels seen
                remains to change power regulator



20100831
========

tested a system with a cable as a "backplane":

RCU - flat cable - 1 connector - terminator
                   1 FEC

OK


20100902
========
tested 1 pair of backplanes (used FEC3 and FEC61 in the tests): OK

tested JAPAN cards FEC12 and FEC80 with power regulators replaced: OK
these had with "old" power regulator a low (1.4V) voltage into PCA16.

Voltage and currents measured with new regulator:
FEC12 : 2.2V 0.91 A -> 1.490V to PCA16 stable
FEC80 : 2.2V 0.94 A -> 1.495V to PCA16 stable
no bad channels

20100903
========

Test of FEC7 with replaced regulator since it  too low voltage to PCA16,
now OK.

Test of 1R + 1L pair of terminators OK