A4988 card KO

[cecemoto]

Hello to all I'm new in the geeetech familly

I received my new Geeetech I3 Pro B 2 weeks ago and I finish the building this week-end. When I try to make it working The Y axis was some times shaking and other times works.
I thought that was the motor so I cross the connection with the X axis motor => after The X axis motor was shaking and the Y was working well
After I reconnect the motor on their right connectors and the Y axis start again shaking.
I discovered that if I touch the A4988 Stepper Motor Driver the Y axis was working normally but some times not.
I crossed the A4988 Stepper Motor Driver with the Z axis and after that the is was the Z axis who shakes.
I Tried a printing obviously it doesn't succeed.

For the expert in the forum does my diagnostic correct or do you have other Idea to find the origine of my issue ?

Thanks to all

[William]

Hi,
You can measure if the voltage between the potentiometer and GND was too low,and increase it if it was:
http://www.geeetech.com/forum/viewtopic ... 17&t=17038

[cecemoto]

thanks for this proposition of diagnostic. I'll verify this evening

[cecemoto]

Hello, I tried to measure the voltage between the potentiometer and the ground. I got 0.78V I tried to modify the value to obtain 1V but it was difficult. Since the motor doesn't move any more. I tried to change the A4988 card with the motor of the X axis and the issue follow the card the X axis doesn't move and the Y axis does.
Do you have an other idea ?

if not I think that the card is over !
The printer never works, how could I received a spare parts .

[William]

Hello, I tried to measure the voltage between the potentiometer and the ground. I got 0.78V I tried to modify the value to obtain 1V but it was difficult. Since the motor doesn't move any more. I tried to change the A4988 card with the motor of the X axis and the issue follow the card the X axis doesn't move and the Y axis does.
Do you have an other idea ?

if not I think that the card is over !
The printer never works, how could I received a spare parts .

Sounds like the A4988 on Y axis has some problems,you can ask your seller for a replacement.

[cecemoto]

thanks a lot I'll do this

[cecemoto]

Hello,
Just to give a feed back, the card has been changed and now the printer works perfectly.
Thanks for your help

[William]

Hello,
Just to give a feed back, the card has been changed and now the printer works perfectly.
Thanks for your help

Congratulations,and thanks for your updates.