namco system 2

I successfully started my Namco System 2, but I encountered a RAM error 40cc16 on the screen. I'm not sure which RAM chip is causing the problem. Could anyone please help me identify and resolve this issue? Any assistance would be greatly appreciated. Thanks!

A few days ago, I received a Namco System 2 mainboard from Yahoo Japan. It is a display board specifically for Final Lap (C107) and does not include the OBJ ROM Board. Since many EPROMs have not yet arrived, I have only installed a few. Currently, during testing, there is no video output, but...