Ryobi 520H - 1 colour offset press - Need help!

I have a problem with Ryobi 520H year of manufacture 1991 with a display which is operated controls for fine-tuning, turn on together when the machine is turned on, but after a short time without any reason to shut down and can no longer be included. I tried to replace the battery, which is located in the control box but the same happens again. Can someone help me? Thank you in advance.

 

Here is the mail adress:
cicerovb@open.telekom.rs

 

Dear colleagues,
whether someone may have a service manual for Ryobi 520H year of manufacture 1991 (one colour offset press) to be able to solve the problem?
Thanks in advance.