Geeetech

I just finished assembling and started testing my Prusa I3 all aluminum printer what I have tested so far works fine with one exception. the X axis will not home properly. Y and Z work exactly as expected. What X does is when I hit Auto Home X will move to the right as it should, then it stops and immediately goes to the Y axis which moves forward then back to the home switch. After Y is finished the Z axis moves up the homes and stops. If I go to manual jog on X axis i can jog to the right as it should. When i spin the knob back to zero, the X axis move back exactly to its starting location. I also reloaded the firmware following the directions on this site. I did try once reversing the X axis during auto home it moved to the left the same amount it had moved to the right before then immediately jumps to Y home which works then Z which also works. I even disconnected the X home switch it still works the same. It is literally driving me nuts. All I can assume is a hardware defect on the Sanguinololu board. The software I used was Plusa I3 A Sanguinololu.

sorry although you wirte so much, but I am still confused...did you mean yor X axis direction is reversed when homing?

No it goes in a posative dirction. It never reverses towards the home switch it appears it sets the new location to home. If repeated the head will keep moving to the right every time you hit auto home. It seems to move about 2 cm each time. And that location is set as X axis zero.

seems your X axis endstop wiring has a bad conact, or the endstop driection in the firmware is reversed, you can change the settings here and upload the firmware again:

// The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
you might need to try a second time, cause you don't konw it is true or false in your original firmware.

The problem is solved. It turns out one of the connections on the X axis switch was not stripped before the terminal was crimped on so no connection no X axis home. A little solder and the printer is working and printing. Thank you everyone for your help.
Keith

Greetings,
The X axis from "Control Board" does not give a constant signal to the stepper motor! the motor " Jettiring" I try to connect other motors to the same output, and all the motors did the same thing! So, the issue is not from the motors. it's from the BOARD!

What should i do?

I purchase it from Bangood.com:
http://www.banggood.com/Geeetech-Alumin ... 98030.html

Your product link:
http://www.geeetech.com/geeetech-alumin ... p-944.html

http://www.geeetech.com/forum/viewtopic ... 17&t=17038

please check this for trouble shooting