cRIO troubleshooting

[Al Skierkiewicz]

Conner,
I am guessing from your description that you fried a chip on the analog breakout board that plugs into the 25 pin connector on the top of the analog module in slot 1. From that description I believe you had reversed the battery leads to slot 1. In the process you damaged the five volt regulator on the board. That is the only chip on that board. The board is not reverse polarity protected. There is a single LED on that board that lights when correct voltage is present and the regulator is functioning. Unfortunately, simply replacing the chip may have not repaired everything on the board.
It is also possible that a slot on the Crio is defective. Often this occurs when foreign material drops into the connector or a pin on the connector is bent. While a bent pin is sometimes recoverable, generally this is not the case.
Please remember that the battery voltage on this board is used (through the jumper) to sense battery voltage for the Crio. Should it fall to less than 5.5 volts, the Crio disables output for motor control. The intent is to allow the battery voltage to rise and prevent the Crio from rebooting. The power supplied by the PD may fail when the battery falls below 4.5 volts. This voltage (as sensed) is also passed to the dashboard and is read during the match by the FMS.