Prusa I3 pro B: issues with the board ?

[Lobrico]

Hello everybody,

I'm a newby at 3D printing. I bought & installed the I3 Pro B, my very first 3D printer. At very first moves it seemed installation was (almost) ok:
- When powered off, all 3 axis moves well without friction.
- When powered on, motors are engaged. I can use the "Move" menu to have the motors of X, Y and the 2 motors of Z working properly in both directions

So before being able to print anything, i'm facing the issue with motor E that won't move at all :

I tried this :
- i plugged E motor + E cable on the "X" A4988 driver. When using "Move > X" command, the E motor was properly moving in both directions. My conclusion : E motor and E cable are fine.
- back to original configuration, i switched E and X A4988 drivers. When using "Move > X", the X motor was properly moving. My conclusion : original E driver is fine
- and still on previous updated config, when using "Move > E", the E motor was NOT moving (on the X driver that is ok)
My conclusion to all of this is that my problem is not material but something in the board . I don't know how to check further if it's electronic or software (i'd be surprised).

BTW all the drivers' voltage is between 0.8 to 0.9 volt

What's your opinion on that ?

I'm quite desperate with this printer that seems to be useless before any print Thanks for your very appreciated help !

L.

[Lobrico]

(deleted)

[Lobrico]

no inspiration anyone ?

[William]

Hi,if the motor does not rotate, maybe those parts or components have a glitch.

①The subdivision of the stepper motor is 1/16. It means you need to plug all jumper caps.

②Please, see if the stepper motor or motor cable is broken. You can verify them by plugging them to another working motor connector such as x or y.

③Please, see if the stepper driver board of extruder is broken. Simple test: swap the extruder driver with a good driver. Then check if extruder can work well or not.
Besides, the voltage between potentiometer and GND is 0.8V-1.2V. if it was less than 0.8V, you should increase it by tightening the potentiometer(screw)
You can refer to this:viewtopic.php?f=19&t=17097
Hope to help you.

[Lobrico]

Thanks for your reply William

Unfortunatelly, i already checked everything you mention. Please check my initial post to see if my tries are not the same as those you say (it seems to me it's the same.)

For point 1/ that i didn't mention, here is the picture of the jumper caps https://ibb.co/kXsFP3f . It seems to me they are all plugged (although in different position which shouldn't matter).

[Lobrico]

Here are the news.

I got a new motherboard that I correcly flashed with the latest Marlin firmware (there was no firmware when i got it). Then the printer boots and LCD shows usual menu. Then.... same as before... I re-did all the tests and still the board seems to send no signal whatever the driver, the cable and the motor that is plugged to it (while those drivers, cable & motors work when plugged to another slot). Tension has been fixed at 1V. All jumpers are on.

I even tried to plug on extruder2 without success.

I don't know what to try now.

Would some video help ?