Rp 3700, My machine during the

Rp 3700, My machine during the master making process shuts down because it indicates that it has not removed the master from the print drum. IT HAS REMOVED THE MASTER. It does not help to reset the machine. It does not help to manualy put on a new master to start over. The machine successfully removes the master each time. It burns a new master each time but will not roll it on the drum as it indicates that the master has not been removed.