If were me I think I would remove power from the printer.
Reboot your machine and start over.
Also check the reference voltage on the drivers maybe set them to 0.55
If the LED stays on for the extruder swap the driver cards to see if it moves.
Hi paziman,
if the red LED is still on after rebooting like Wrong Way suggested, measure the following voltages please.
The board needs to be powered for this, and the E Pololu removed like shown in your photo.
Set your multimeter to a > 5 V-range (e.g. 20 V). Take care not to connect the tips when measuring pins next to each other or short circuit anything. Use either of the two GND pins in the left row as reference connection, or the “-” screw terminal if that’s easier to access. Post the values for the following pins:
VDD
VMOT
EN
STEP
Cheers,
kuraasu
VDD
5.01
VMOT
15.49
EN
5.00
STEP
0.00
edit: I looked at the board schema ( Schema_base.jpg )the led should not be on right now, driver removed and no movement.
Perhaps the t4 is faulty…? Anyhow, might be replacement part issue for now?
Hi paziman,
you are correct, the LED should not be on. However, the LED is just the minor issue, more interesting is whether the connection between the ATmega and the Pololu socket is ok.
Can you test whether these two points are connected? Power can be off for this test.
If there’s no connection, what’s the voltage at the point next to the ATmega (power on of course, and with reference to GND like before)?
Cheers,
kuraasu
There is connection in between those two points.
Hi paziman,
then it seems to be an error in the transistor, as you suspected. If you don’t want to take any risk with the board, you can ask for a replacement, either at your distributor or at Velleman.
Fixing the error at home could also be possible, if you have some experience in soldering (space is limited there, so a fine SMD soldering iron, and a magnifying glass would be beneficial). Or rather, taking out the faulty component(s) could be, fixing is another question depending on what’s actually broken.
However, the connection between the ATmega and the E Pololu should not be compromised by this issue. To test the extruder while the hotend is cold, you can send a “M302” command, just make sure that no filament is loaded so the hobbed bolt can turn freely.
Cheers,
kuraasu
Thank you very much for your help.
I’ll ask this from distributor.