Sondras

I purchased a baby lock quilting machine, 12 ft pinnacle frame and stitch regulator used. I cleaned the machine, oiled it...it sewed beautifully. I put up the frame, mounted the stitch regulator and machine...but the machine will not sew. At all. I changed the. Power cord to a new one removed the encoder wheels, and reinstalled, removed the control box and checked inside. It only has one blue little box on the inside. I cannot find any diagram on what is supposed to be there...can anyone please advise?