gliebig, I am having the same problem as well my machine is the premium monsterds brand new June this year, I have a shaker motor installed and it appear to be the shaker motor some how if I use the shaker motor I get the phantom hammer every game I pay if I turn the shaker off in the settings it will not fault at all so im not sure what the problem is, I have replaced the shaker motor, the shaker motor pcb, the magnet pcb also installed the "line filter on j2" in the back board.
My question to you is do you have a shaker motor installed?
Anyone else have any ideas.
This is a brand new machine out of the box, home use only and I have also done a factory reset and reinstalled the 1.70 firmware any help would be appreciated.