So I dropped a heat sink onto the stepper driver. The event caused the board and my laptop to shutdown. Now the stepper driver isn't working along with two others on the board. I'm using the megatronics 2.0 and Pololu A4988 drivers from sainsmart. To be specific, I dropped the heat sink that came with the drivers onto the E0 driver. After I recovered from the shutdown, X and Z axis would not respond. I've replaced the two axis drivers with spares that I have, but I don't get how I could have blown up three drivers by dropping a heat sink. Any ideas as to what happened? https://reprap.org/forum/read.php?219,690505,690505#msg-690505 Sun, 09 Aug 2026 18:36:05 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,690505,690570#msg-690570 https://reprap.org/forum/read.php?219,690505,690570#msg-690570
[www.pololu.com]

scroll down till you see the Schematic diagram]]> Dust RAMPS Electronics Thu, 21 Jul 2016 03:30:25 -0400 https://reprap.org/forum/read.php?219,690505,690525#msg-690525 https://reprap.org/forum/read.php?219,690505,690525#msg-690525
The main board works. I was able to heat the hotend and control one axis at a time until I replaced two of the drivers. No, just the E0, X, and Z drivers were affected. I believe that you are right, though, that I sent 12v to something that can't handle it. Do you know if a schematic for the drivers exists?]]> johnkmitchell911 RAMPS Electronics Wed, 20 Jul 2016 19:40:22 -0400 https://reprap.org/forum/read.php?219,690505,690511#msg-690511 https://reprap.org/forum/read.php?219,690505,690511#msg-690511
You now need a new board. (or replace the atmega2560 cpu chip, if your good at SMD reflow work)]]> Dust RAMPS Electronics Wed, 20 Jul 2016 18:16:42 -0400 https://reprap.org/forum/read.php?219,690505,690505#msg-690505 https://reprap.org/forum/read.php?219,690505,690505#msg-690505
To be specific, I dropped the heat sink that came with the drivers onto the E0 driver. After I recovered from the shutdown, X and Z axis would not respond. I've replaced the two axis drivers with spares that I have, but I don't get how I could have blown up three drivers by dropping a heat sink. Any ideas as to what happened?]]> johnkmitchell911 RAMPS Electronics Wed, 20 Jul 2016 17:24:00 -0400