Marble madness error

[thebman80]

Ok so I haven't played the game in over a month just turned it on and get an error that reads "6502 not responding". Any ideas what this error could be I have a spare system 1 mother board I could try swapping that tomorrow. I put the game into test mode it comes up but will not do anything at all. It says to hit the first player button to move to the next test screen does nothing at all when the button is pressed.

 

[thebman80]

OK problem solved finally had 15 min to figure out the problem turns out that that some chip legs were corroded basically totally black and a pencil eraser cleaned them up nicely. For future reference for any one that experiences this problem these are the two chips I pulled and cleaned R6522-33 and the TMS5220NL chip to the left of it. They were both badly carroded black so at some point I think I might just pull some other chips to check them out.