Solution
All NI 784xR/785xR devices have a user-replaceable socketed fuse to protect the supply from overcurrent conditions. When checking the +5 V terminals, you notice a lower output voltage (below the tolerance) and there is no voltage from your cabling to the terminals, that's means that the socketed fuse is damaged:
- Return the device to NI for repair, contacting NI;
- NI 784xR/785xR devices have a replaceable fuse, Littelfuse™ part number 0453004, that protects the device from overcurrent through the power connector. To replace a blown fuse in the NI 784xR/785xR, complete the following steps:
- Power down and unplug the computer or PXI chassis;
- Remove the PCI/PCI Express device from the expansion slot on the computer, or the PXI device from the PXI slot in the PXI chassis;
- Replace the blown fuse while referring to the figure below for the fuse locations;
- Reinstall the PCI, PCI Express, or PXI device into the computer or PXI chassis.