I began to build a second driver board, but after putting on the resistors and preparing to install capacitors, I found the VCC and ground lines were shorted. I couldn't find any spot that seemed to be causing the problem, even after lifting as much solder as I could off the board. I put it aside as a potential bad board.
Taking a third PCB card, I did a full installation of all components, with no signs of shorts or other problems. It still must pass the wiring and correct operation tests, just as the first board I built must. The first board passed all its connectivity tests by mid afternoon, then I went back to the bad board so see what is wrong.
|Board 1 installed on the extension board|
|Board 2 with shorted power connector pins - unusable|
I put the third PCB (2nd is bad) on the test bench. All the connectivity and short circuit tests were passed, visual inspection is good too. All that remains is to power it up and check the function of the drive with the fpga logic.
|Board 2, in place waiting for power connector hookup|
|Power supply connector|