Do yo have the service manual? If not, contact me direct, it wll make
the job easier.
I see three places to look at. First make sure that the gripper motor
is plugged in and see if you can rotate the shaft that comes out the
bottom of it. Second, check all the plugs that go into the control box
and power supply, make sure they are seated tight. Third, check the
operation of the micro switches on the cam.
Charlie