Anyone know Hunter alignment machines?

[eastbay]

Hi, anyone know hunter alignment machines? Picked up a K111 machine with DSP 200 heads and the right rear head won't communicate/compensate. I have tested out doing a front alignment only and it works for that, but of course we all need 4 wheel alignments.

Have tried changing around all the cables and connections but no love so far. Unit lights up and goes white on the alignment machine screen before changing back to flashing red.

any ideas?