Thank, I am always adjusting the 5.0v before using any pcb. Il will set it at 5.1v and see if there is any difference.Two more things to check in addition to making sure the M72 Multi boards are fully seated and that the underside of the middle board isn’t rubbing against the top of the Multi daughterboard on the bottom:
- Make sure the board stack is receiving 5.0V of power. The M72 triple board stack draws a lot of power and you may need to bump your power supply up a bit. Try running at 5.1V and see if the glitches stop.
- Make sure the ribbon cables connecting the boards together are fully seated and in good condition. You can use a multimeter set to continuity check to confirm a good connection on each pin. It is possible for one line to develop a short and cause glitching.
About the ribbon, do you recommend to first test continuity on the unplugged ribbon ?