Extruder Stepper motor not working - i3 Pro B

[chrisj]

Hi.

I'm having a serious issue with my i3 Pro B. The extruder stepper motor is not working when connected to the correct socket on the GT2560. I believe my GT2560 is broken.

I have read the other forums post closely, and performed the following tests:

* When I connect the extruder to the Y axis, and move using menu = the extruder stepper motor WORKS.
* I swap extruder stepper driver (4988) with Y axis = Y axis stepper motor WORKS.
* I test all 4988 driver with multimeter - all correct (0.8-0.9V)
* I clear arduino using EEPROM clear, then reinstall firmware = extruder DOES NOT WORK
* I have tried using 2nd extruder connection on GT2650 = DOES NOT WORK

I have no other ideas, and advice would be greatly appreciated - a replacement GT2560 would be good.

Thanks Chris J

[William]

Maybe the extruder motor wire was broken?

[chrisj]

Hi,

Thanks for the reply.

No I have tried using the wire from the Y-Axis and it still does not work.

[William]

OK,i think you can try this:
First heat up the extruder to the melting temp(depends ABS or PLA you're using),then test the extruder motor's movement after the preset temp reaches.
Let me know how it goes.

[chrisj]

Hi,

Yes I have tried this multiple times.

I have let the printer heat the nozzle and heatbed to the correct temperature - then tried to print.
The extruder motor does not move at all.

[William]

I saw you said you tried the second extruder socket?It can't be the two extruder sockets are all broken i think...
Could you attach a video about your extruder motor test?Including heating the nozzle and not heating.Thx