laser cutter

[John Coder]

Laser Cutter has gone down. According to Jose a chip has blown. heat sink flew away.

[Nathan Armentrout]

That's not good. Last time it broke, the communications card was the culprit. Sounds like a motor driver blew this time. I don't believe there is any warranty left on the cutter...

[Brad Luyster]

The motor driver is spectacularly blown.  In fact, all identifying marks have been destroyed.  I strong suspect that the driver chip is the DRV8821 from Texas Instruments, however.  Based on the board layout, this is the only possibility I can see.  If the board is really and truly out of warranty, we can give replacement a shot.  I'll defer to someone else, however, to actually contact full spectrum laser.

The motor driver board is now sitting inside of the laser cutter.  I marked all cables as I removed them.

[Brian Wagner]

I am out of town at the moment, but I do have a few drv8821s in my toolbox. I will take a look when I get back. 

Brian

[Brad Luyster]

That's an oddly specific part to have around.  When will you be back in town?

[2600]

Oddly specific is right... Don't have that one on hand here. Too bad it's not a TIP125 or a LM358. 

I would be wondering about collateral damage that frequently accompanies a spectacular failure like this. The power-supply rails that power this chip would typically experience surge currents that are unhealthy for rectifiers, pcb traces and such. The windings on the motor that it drives would bear a critical look as well before attempting a smoke test. And if there are commutating diodes external to the driver device, they bear checking, too. 

73

[Brian Wagner]

I will be back in town on New Year's Day. I got a couple drv8821 samples a year ago for the project that was in my brain at that moment. I have no idea what that project was. 

[Jeff Johnson]

Are u in Chattanooga now?

[Brad Luyster]

Laser cutter is still broken, repair attempt failed.

[Brian Wagner]

I am calling full spectrum today to get a replacement board.