Printer reboots when initating pre-heat  

Re: Printer reboots when initating pre-heat

Hi Adam

Welcome to the forum and welcome also to the wonderful world of 3D printing!

Obviously, the printer was working when it left the factory so it would appear as though the shipping has moved a few pieces about!

First thing to check is the heater connection on the RAMBo board. Make sure the screw are nice and tight and make sure that the connector is seated firmly into the socket.

Nest thing to check are the four screws around the heated bed. You will need to undo them completely and electrically isolate then from the tracks on the heated bed PCB. You can add some plastic washers or insulation tape for this.

Can you please try the above and then let us know the results.

Thanks

Peter

Re: Printer reboots when initating pre-heat

Peter,

Thank you for the quick response.

The connection for the extruder is secure.

I went to the store and purchased 8 nylon washers to replace the steel ones supplied on the bed.

I think I have isolated it to a problem with the bed. I went to the settings and manually changed the temperature for the head and the bed separately.

The head will heat up to to 200 with no problems, but when I manually set the bed to 50 degrees it reboots immediately.

Can you tell me what the next step should be?

thanks

Re: Printer reboots when initating pre-heat

Adam

OK, if insulating the bed didn't work and the connections are good, then you will have to contact the support department.

Sorry I can't help further...

Go to the shop page and use the live chat to talk to support. They are all very good and will be able to either give you some further advice or pass the problem on the tech dept.

Peter

Re: Printer reboots when initating pre-heat

I had the exact same issue. Check your power supply there is a little switch that can change it between 110V and 220V. Mine was set to 220V even though I'm in North America. Once I changed it to 110 V it worked perfectly.

Re: Printer reboots when initating pre-heat

lonlycracker,

Did you have to remove the metal cover to the power supply to get to the switch. I just looked at mine and had trouble seeing an actual switch in the recess. Would you mind posting a picture of the switch you flipped?

Thanks,
Adam

Re: Printer reboots when initating pre-heat

Adam

You don't have to remove anything. There is a sticker there - the hole is a little low. The switch is just about where the label says "220"

Peter

Re: Printer reboots when initating pre-heat

I want to thank everyone for the help, it works perfectly. I spent all last night printing. I'm very pleased.

Re: Printer reboots when initating pre-heat

Hi Adam

Thanks for letting us know. That's another one for the memory banks...

Enjoy your printing and if you have any queries please ask.

Peter

Re: Printer reboots when initating pre-heat

Glad to hear it was easy fix. I am sorry for my team 😐
Did you print something cool so far? 🙂

Re: Printer reboots when initating pre-heat

this is interesting because I was having the same issue AFTER I have been printing the last 2 days as soon as I finished cleaning my nozzle.
During trouble shooting, I took the heat bed off of y frame to test and it works perfectly fine when it's not connected to the y carriage.

When I first assembled my printer, I couldn't even get the preheat to get to pla temperature without having to preheat multiple times since it kept rebooting. I noticed my glass war oriented so that the longer side covered the soldering on the side of the heat board. I rotated properly and it started heating fine.

Re: Printer reboots when initating pre-heat

I, unfortunately, am experiencing the same issue. I have put together our Prusa i3 kit, and when preheating the bed the LED blinks and the printer restarts. I have been throwing multiple threads on the forums trying to diagnose the issue, but I am still running into the issue.

I've tried the following:
- Checked to see if there was exposed parts on the heat bed where the washers contact; it did not seem like there was any exposures, but I put in insulated washers to ensure it would not short here.
- Swapping the wires in the terminal connector, both configurations produced the same result. I made sure to tighten the screws down as tight as I could, and that the connector was pushed into the socket straight.
- Checked the voltage switch on the PSU, making sure it was switched from 220v to 110v. (I am located in the U.S.)
- Hooked the heat bed up to an external power source, which lit up the LED and the bed started to warm up.

Currently, I am printing without the heatbed. I've set the temperature to 0 for any print that I do, and the printer runs just fine. I am curiously stumped by the issue at the moment, and would love to resolve it to be able to switch to other materials besides PLA.

Thanks!

Re: Printer reboots when initating pre-heat

Hi Stacey and welcome to the forums.

OK, it seems as though you have done everything you should so far and still not resolved the problem. So can you please do the following:

With a multimeter and you please check the resistance at 4 points:

The heater, between the two solder pads
The heater, from one pad to 12V negative rail
The heater, from the other pad to 12V negative rail (first 3 with the heater connector plugged in)
On the heater connector, between the 2 screws at the top of the connector (with the connector unplugged)

Then, can you please turn on the printer and check the voltage on the 12 V rail.

Please let me know the results.

Thanks

Peter

Re: Printer reboots when initating pre-heat

Peter,

Thanks for such a quick response! It took me a few days to dig up a multimeter, but I've taken the readings.

The heater, between the two solder pads
1.5 ohms, on both directions.

The heater, from one pad to 12V negative rail
To verify, this would be the Bed In (-) from the power supply? I can retake this if it seems off, but I read about 260 ohms.

The heater, from the other pad to 12V negative rail (first 3 with the heater connector plugged in)
Same as above, 260 ohms.

On the heater connector, between the 2 screws at the top of the connector (with the connector unplugged)
It fluctuated between 1.6 and 1.7 ohms.

Then, can you please turn on the printer and check the voltage on the 12 V rail.
It read 12.15 V.

Re: Printer reboots when initating pre-heat

Hi Stacey

All those readings are about what I would expect, so I am now stumped.

Can I suggest that you contact support - use the "live chat" facility on the shop pages. Give them a link to this thread; they will be able to sort this out for you.

Sorry.

Peter

Re: Printer reboots when initating pre-heat

It's no problem, thank you for your suggestions though!

Re: Printer reboots when initating pre-heat

Hello!

Did you ever manage to fix the issue? I am experiencing the same issue exactly! Sometimes I manage to start a print only to stop 2 minutes into the print!

Thanks and Best Regards,

Re: Printer reboots when initating pre-heat

Hi Mark

I think you have had your printer for a couple of months now? When did this problem start with you?

Have you checked the voltage setting on the PSU? Cable management/routine? Connectors - screws tight and firmly seated?

Peter

Re: Printer reboots when initating pre-heat

5 months exactly, cables are connected perfectly as it worked great for all those 5 months.

I printed around ~110 hours before it started happening. Connectors do not get hot or anything. Printing without the heatbed (temp set to 0) works without problems.

Re: Printer reboots when initating pre-heat

Mark

Did you insulate the washers on the top surface of the bed under the screws in the corners?

It may be that over time, they have started shorting out the PCB.

Peter