Sudden lost of Y2 slave control

Hi PCW;

I reinstalled the boards and then verified with halshow that all of the field input switches were functioning correctly. With the spindle located in the middle of the table I started the homing sequence. Z and X both homed properly, however, when Y started the homing process a, "joint.1 failed to unhome" message was presented 3 times then joint.1 began to home while joint2. failed to move.

The machine is configured with both the Y and the Y2 axes (joint.1 and joint.2) set up with "both limits and home" switches using a single input for each axis. Thus, neither axis home switch was triggered yet LINUXCNC could not logically unhome one of the two axes.

What is the next step to resolve this issue?

Kind Regards,

One way to debug this might be to do a halscope plot of the homing sequence.
That is, plot the home switch states and Y +Y1 motion during a home 
move.