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MMU2S red and green lights blinking  

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account
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New Member
MMU2S red and green lights blinking

Hi all,

 

I've had my MMU2S for a while now and I've been getting on and off results with it. 90% of the time when I start a print and the MMU boots up and homes it will go and blink all five red and green leds. The corresponding explanation is that the trinamic motors can't get enough power to function properly. This repeats for a couple times but eventually hangs and stays blinking. If I'm lucky the print will start but so far I've only done single colour prints because I'm afraid it will hang mid-print

I have double checked and every connection is how it should be and I've got no other components hooked up to the power supply or EINSY board. I'm using all stock parts except the ptfe adaptar for the MMU2S unit and a mod to mount the MMU2S control board to the underside

Posted : 24/03/2020 4:50 pm
vintagepc
(@vintagepc)
RE: MMU2S red and green lights blinking

Try loosening your MMU idler screws slightly. I find the default has a death grip on the filament and isn't necessary for me.

Posted : 24/03/2020 5:02 pm
account
(@account)
New Member
Topic starter answered:
RE: MMU2S red and green lights blinking

That doesn't seem to fix it, got the same result of the mmu initializing, failing and trying again for a couple before being stuck with the flashing lights.

Any insightfull debug tools I can use?

Posted : 24/03/2020 6:16 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: MMU2S red and green lights blinking
Posted by: @account

Hi all,

 

I've had my MMU2S for a while now and I've been getting on and off results with it. 90% of the time when I start a print and the MMU boots up and homes it will go and blink all five red and green leds. The corresponding explanation is that the trinamic motors can't get enough power to function properly. This repeats for a couple times but eventually hangs and stays blinking. If I'm lucky the print will start but so far I've only done single colour prints because I'm afraid it will hang mid-print

I have double checked and every connection is how it should be and I've got no other components hooked up to the power supply or EINSY board. I'm using all stock parts except the ptfe adaptar for the MMU2S unit and a mod to mount the MMU2S control board to the underside

It would also be possible that filament residues block the selector or the sensor or the drivers on the board are overheated if printing in an enclosure.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 24/03/2020 10:01 pm
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: MMU2S red and green lights blinking

Posted : 25/03/2020 8:19 am
account
(@account)
New Member
Topic starter answered:
RE: MMU2S red and green lights blinking

I've been doing some tinkering and after I've put it back together every load and unload happened succesfully. The only noteworthy thing I've done is tightening the screws on the idler shaft some more.

Unfortunately after running a succesfull print this evening during the unload it got stuck on the red/green blinking lights. Might this have something to do because I'm printing in an enclosure?

Posted : 25/03/2020 9:05 pm
davbow
(@davbow)
New Member
RE: MMU2S red and green lights blinking

I think if the lights are blinking red and green then whatever problem the MMU thinks it had has been fixed.  Press the right button to continue.

Posted : 13/05/2020 5:01 pm
Kylian
(@kylian)
Active Member
Enclosure

I have same problems and my printer is in an enclosure. I'm seriously thinking the problem is with the heat inside the enclosure. Im looking for a solution to refresh the controller.

Posted : 16/09/2021 11:52 am
Andarne
(@andarne)
Eminent Member
Try adding a USB cable to the MMU2

Try running a USB cable from the MMU2 unit to a PC or powerbank/mains plug. I've been doing this, and ran over 7k colour changes without issue since doing it. Seems like the MMU2 can't draw enough power, so by adding the powered cable it gives just enough to get it working again.

Posted : 19/09/2021 12:48 pm
karl-herbert
(@karl-herbert)
Illustrious Member
Voltage drops...

Voltage drops can actually cause malfunctions of this kind. For this reason I would also try to supply the MMU2 with an extra 5V source.

wbr,

Karl

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 19/09/2021 7:52 pm
CvK
 CvK
(@cvk)
Active Member
USB and voltage drops.

I'm having this problem, 5 lights flashing at unload/99% done, with my MK2.5S MMU2s. Would the 5v go to the firmware usb port directly? Do you think running a usb from a RasPi running octoprint to the MMU2S would provide needed voltage?  Also, how can I check the voltage?

Posted by: @andarne

Try running a USB cable from the MMU2 unit to a PC or powerbank/mains plug. I've been doing this, and ran over 7k colour changes without issue since doing it. Seems like the MMU2 can't draw enough power, so by adding the powered cable it gives just enough to get it working again.

 

...
Posted : 25/09/2021 2:10 am
Kylian
(@kylian)
Active Member
It works for the moment thanks to your suggestion.

Thank you for your replay. Simpli pluging a USB cable from de MMU2s to a simple phone charger did the job. For the moment the error did not occur again.

Posted : 26/09/2021 7:36 pm
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