it works

I found this
http://www.pinrepair.com/sys3/index.htm.

and had a read. It didn't help but gave me a better understanding of the system. If it was the battery it would have shown low batt on the display with extra beeps.
I cheched the voltage of the batt and it read 3.2. The system also measures the current appartently. To change the battery looks hard as it is soldered in. How long do these batteries last as it looks original and the machine is 11 years old?

The leds on the 2 boards flashed evenly.

I stumbled across the test thing inside the coin door. I noticed that when showed freeplay, it was on NO, I changed this to YES, rebooted and now it works.
I don't know why it changed as I was previously on it.