Printrboard suddenly no USB; help?

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Printrboard suddenly no USB; help?

Postby lairdb » 2018-Feb-Sat-12-Feb

Simple metal, about 2 years old, original F5 Printrboard.

Aside from issues with the original ceramic Ubis, everything has been fine since the beginning. I was in the process of converting to an E3D when my Printrboard went completely off the air. (I have _not_ updated the firmware yet; I was leaving that to the end or not-at-all.)

I admit, I was plugging and unplugging the E3D without powering the system down, while I fiddled with physical positioning. That said, I did not see or smell any magic smoke, and all the components look fine, and the printhead was not energized.

The Printrboard is not recognized as a USB device at all at this point. Not on the Octopi, not on the WintelPC. Not with any of several known good cables. Not when powered up normally, not when powered up or reset with the boot pins shorted. (This is what really concerns me.)

5v LED does light. Same behavior after disconnecting every cable except for power and USB.

Further troubleshooting steps? Components I should inspect really closely? Give up and order a new board?

Thanks.
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Simple Metal Kit, heated bed
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Printrboard suddenly no USB; help?

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Re: Printrboard suddenly no USB; help?

Postby RetireeJay » 2018-Feb-Sat-13-Feb

It's not a good idea to plug & unplug inductive loads when power is on, BUT the E3D heater and thermistor are resistive loads, not inductive loads. Therefore, plugging and unplugging them with power on *should* not cause an electrical problem, especially if the board is not calling for heat. Still, I generally try to have power off when doing that sort of thing unless power-on is a necessity for debugging.

I wonder if stress on the board due to the plugging and unplugging caused some wire or mounting screw - something metal - to move and short out a critical path.

The F5 board still uses the mini-USB, which is a known weak point. Maybe the plug has partly broken away from its circuit traces.

Sorry I don't have anything definite. An open circuit on the thermistor leads will cause the firmware to shut down printer motion and heating, but the board still can "connect" to a host.
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Printrbot Plus operational January 2013
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GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
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Re: Printrboard suddenly no USB; help?

Postby lairdb » 2018-Feb-Sat-14-Feb

Thanks; we're on the same page. Thing is, I was plugging and unplugging up at the head end; nowhere near the board. Mini appears fine, and didn't (AFAIK) experience any movement at all between works and doesn't work. Also, if I disconnect 12v and bridge USBPWR I get the 5v LED.

Sigh.
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Simple Metal Kit, heated bed
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Re: Printrboard suddenly no USB; help?

Postby Mooselake » 2018-Feb-Thu-12-Feb

Might have blown the MCU disconnecting the thermistor, but that's wild supposition.

Coincidences happen, or maybe you bumped the usb cable and the connector came loose. Visually inspect the micro usb connector (I had a laser engraver that new had power, but the data lines were broken. The connector fell off after a few more test cycles and is on the bench about to test my SMD soldering skills, no warranty/DOA support from gearbest.com). If it looks suspicious you can try and have a cell phone shop repair/replace it. Might not be worth it, if the Printrboard's still $69.

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