Rambo DOA?

Mostly Printed CNC - MPCNC Troubleshooting
1

I bought the kit from this site, so I am using the end power supply and rambo that came with it.

I was going to attempt just running the steppers for a first step and wired up the board to the power and steppers and the LCD controller, but nothing came on, no LEDs or anything. I unplugged everything and checked I was getting 12v on the terminals. Only with power to the main board and nothing else still nothing. I plugged in just the USB to a powered PC. I assume that would at least light the LEDs, nothing. If this is anything like my RAMPS 1.4 I have for my i3 I built the board should power with just the USB? Even if all the fuses are blown it should at least power on the arudino part of the board?

 

Is there anything else I might be missing?

 

Erik

2

Pictures of how you have it hooked up will really help here. I test every single board before it leaves, so chances of it going bad in the mail are super slim.

 

And no, the USB is isolated.

3

Yeah I figured it was something with my configuration. Electronics is not my strong suit, but I am pretty careful. Knowing you tested it helps. Connected it to the PC and used simplfy3d’s Machine control panel to try and connect, although it wasn’t getting a response the receive LED on the board flashed. So there is something. I will take some pictures of the power setup when I get a chance later. If its powered on the via the terminals properly should there be a power LED lit on the board?

4

yes, I have pictures on the ultimachine page.

https://www.v1engineering.com/mini-rambo-1-3/

5

OK think I got the root of the problem. The power brick included in the bundle is not working, or I am not wiring it up right.

That’s the wiring this is it connected:

No juice

Got an old wall wort I had laying around 12v 2a and wired that up

And we have power, here is the power supply I had laying around:

I assume the 2a is not going to be enough to drive the steppers

 

Let me know if I missed anything.

 

6

You should have a closer look at the link I sent, you are not powering it correctly.

7

Sorry I forgot to include those pictures. That was the original way I had it wired up without it working. So I was trying to just power the logic part (B) of the board to see if it would boot. Here is the non working wiring per the pictures.

 

        • checked with the volt meter. C and B are reporting 12.75ish volts on my meter. But the board doesn’t power.
8

I got a little lost. With my power supply you are showing power at the board but it is not working, with your power supply it shows and works. With your meter can you verify the polarity?

9

I checked the polarity of the working power supply (my old one) and the polarity of your power supply. They match at the terminal screws. And match at the diagram in the linked page you sent.

With your power supply I can’t get the power LED to come on. With my old power supply I can get the LED to come on and everything seems to work. Shot from my old power supply (12V 3A):

 

 

Should I try cutting the power supply and wiring it directly to the terminal and bypass the connector?

 

10

Yeah, I was hoping to switch to the green plugs but now I am concerned. Direct wiring is how we usually do it.

11

Image result for well there it is
1_jnd1bopg6DkMQpqtgcq0_w.jpg1280×657

Working fine directly wired. That green adapter was the issue, shame it was pretty slick looking.

12

Dang, that is a bummer. Thank you for being so patient and trying it out.

Goes to show, adding anything, no matter how small just introduces a potential source of an issue.

1 Like
13

Had the exact same problem with the green power adaptor.
Took me half a day of troubleshooting, but on to the next step!