NSM Arena problem with initialization?

Good morning

I'm from Poland and i only speak english
I try run my old NSM Lowen Arena game.
First i had an errorcode "E Cb". I exchange the battery in [definition=9]TK[/definition] (timekeeper), After installed new battery the automat generated the error "E C".
I pressed the "reset" button a few times and the machine started up and I was able to play the game.

I turned off and on the machine and now machine can not start like before. There is no alarm on display. The left red led (5V) is on. The right red led (rechner) is blinkin few time and turn off.
After a few seconds the machine starts all over again with the same sequence (over and over again.

Additional i send a video with this status. Link below:
https://mega.nz/file/cFMF2BwQ#…JHY3ahNfQbtkTyc

Where should i search the problem?
I will be grateful for any help.

Regards (MFG)
d3s

Hello

Yes!!
I found that one switch in coin unit (coin 2/5DM) not going to back position and that's why the CPU is going restart.

Thank You for help