Teledyne LeCroy PMC2PCI-64 - Manual (Page 6)

5
FOR PCIX6432/PCIX6466-3 (Rev. C and below)
To increase the +5v current limit you must cut the trace between the pads of R23 and perform the
following reworks:
•
To change the current limit to 8A install a 10k resistor at location R22 and a 6.2k resistor at location
R23. This does not affect the current measurement reading.
•
To change the current limit to 10A install a 10k resistor at location R22 and R23. This does not
affect the current measurement reading.
To increase the +3.3v current limit must supply the +3.3v from the mother board or an external power
supply, and reduce the gain of the current measurement circuitry. Perform the following rework:
•
To change the current limit to 5A install a 100k Resistor on top of R33 and R34, this will cause the
current measurement circuit gain to be reduced by a factor 0.50 (I.e. 1 volt will represent 2 A current
draw.)
FOR PCIX6432/PCIX6466-3 (Rev. D and above)
To increase the +5v current limit you must remove R23 and perform the following reworks:
•
To change the current limit to 8A install a 10k resistor at location R22 and a 6.2k resistor at location
R23. This does not affect the current measurement reading.
•
To change the current limit to 10A install a 10k resistor at location R22 and R23. This does not
affect the current measurement reading.
To increase the +3.3v current limit must supply the +3.3v from the mother board or an external power
supply, and reduce the gain of the current measurement circuitry. Perform the following rework:
•
To change the current limit to 5A remove resistor installed at R60, install a 40K resistor, This
does not affect the current measurement reading.
FOR PMC2PCI-64
To increase the +5v current limit you must remove the resistor at R29 and perform the following
reworks:
•
To change the current limit to 8A install a 10k resistor at location R30 and a 6.2k resistor at location
R29. This does not affect the current measurement reading.
•
To change the current limit to 10A install a 10k resistor at location R30 and R29. This does not
affect the current measurement reading.
To increase the +3.3v current limit you must supply the +3.3v from the mother board or an external
power supply, and reduce the gain of the current measurement circuitry. Perform the following reworks:
•
To change the current limit to 5A install a 100k Resistor on top of R39 and R38, this will cause the
current measurement circuit gain to be reduced by a factor 0.50 (I.e. 1 volt will represent 2 A current
draw.)