Y motors not working together

[jcb]

Just finished putting together my Carve King. 
Only one of  Y steppers is moving. Whichever stepper is connected to the "A" port on the CNC Shield is not turning. Any stepper I connect to the Y port works fine.In other words I can switch the Y steppers from left to right and only the one connected to Y ever moves. 

Yes, I followed the instructions and put the two jumpers across the four "Y" pins on the cloning section of the board.
Tested with an ohm meter and the pins are jumpered.


Its like the "A" port on my CNC shield is dead but the board on it is not. Whatever stepper is connected to A doesn't seem to be powering on and can be turned by hand with no resistance whatsoever when the power is on. Meanwhile the stepper connected to Y is powered up and resists being turned by hand. 
I have swapped the 4 controller boards around to various ports and all 4 are working fine. 
Iive tried with UGS (32 and 64 bit) and Grbl panel.

Only other troubleshooting I can think of is to try to run one of the motors from "A" by itself. Is there a way to command just the "A" port to turn the stepper connected to it?

[Derek the Admin]

You’re saying that you’ve put the spare stepper driver on the port already? Can you post a picture of what your board looks like? I know you said you get that on the jumpers but I actually want to visually confirmed and make sure there’s nothing funky there.

[jcb]

Yes, I have tried the spare driver board in the slot and also tried moving the driver board that was in the dead "A" section to other positions (X, Z, for example) it runs those steppers fine. 

I am also able to set the voltage to .65 on the driver board while it is in the "A" slot, so there is power going to it (at least to the point of the potentiometer.)
 
I am at work now so I cant snap a pic of the front of the board, but last night I took the CNC shield off the arduino and noticed that one of the pins is not soldered at all (see circled pin in pic). The trace on the unsoldered pin leads back to one of the "Y" jumper pins on the cloning section of the board. Is this pin supposed to be unsoldered?

[rcferguson]

Feb 27, 2019 15:12:17 GMT jcb said:

Yes, I have tried the spare driver board in the slot and also tried moving the driver board that was in the dead "A" section to other positions (X, Z, for example) it runs those steppers fine. 

I am also able to set the voltage to .65 on the driver board while it is in the "A" slot, so there is power going to it (at least to the point of the potentiometer.)
 
I am at work now so I cant snap a pic of the front of the board, but last night I took the CNC shield off the arduino and noticed that one of the pins is not soldered at all (see circled pin in pic). The trace on the unsoldered pin leads back to one of the "Y" jumper pins on the cloning section of the board. Is this pin supposed to be unsoldered?

Good catch!. I'm gonna say "NO" based on the fact that there is a pad there. I emphatically advise you to solder that puppy!

[jcb]

Well, soldering that unsoldered pin to its pad didn't resolve the problem. Still no action of any kind from any stepper that I connect to "A" - not even a hum  or resistance to motion when powered up - swapping in the spare driver board into 'A" made no differnc, set the voltage to .65 on it and problem remains.

(all driver boards and steppers work when swapped around into the other ports X, Y and Z)

I wonder if that pin/pad being unsoldered from the factory messed something else up the first time I powered it up? That trace does lead back to one of the the 4 "Y" cloning pins.

[Derek the Admin]

hit up [e-mail] please. We'll sort it out and get you up.