No fan, and its a 4 slot MVS cab...the tall one with the stereo speakers at the top.
I haven't had this happen before with any of my carts. These are new carts so thats really the only reason I'm bothered by it.
I think I may have to let it run and see where the main heat source is. I don't know for sure, but it seems to me it was hot inside the cab the other day.
On another note..I do have a CPS2 that I sometimes run in that same cab. Its mounted underneath the MVS board...on the bottom side of the wood, upside down. The fan on that faces the coin door so I can get at the connector.
Think thats it? I have tried to leave the wood door off the back of it...but I haven't really let it run since I found the wrinkles either.
I'm not thinking humidity is a problem as I keep my house at 73 degrees, and the air is actually very dry compared to outside.
I bet its that CPS2, the more I think about it...the more sense it makes..as it's the only thing I have really changed in the last 5 months. Do they run hot enough?