4head tajima

I have a 4 head tajima, head 2 will not pick up the bobbin thread, and keeps breaking upper thread. Any ideas what to look for.

Location: 
United States

Several things come to mind but with it not picking up bobbin and breaking upper wuite possibly the hook is out of timing. Retiming the hook/needle relationship along with checking your hook for any burrs and polishing if needed should put the head back in operation.