I'm new to pachislo machines. I picked up a working Sammy Ghost Shock and a non-working, but nice looking Olympia Trick Monster. I have an E4 error code and have repeatedly tried to reset it, but I'm getting nowhere. I've tried it by going through the normal steps and it still shows up. In addition, if I press the red square reset button on the inside of the door I get a very loud "siren type" noise that remains until I shut off the machine. Also, when powered up the board on the inside left wall of the cabinet has 1 green flashing led.

Does anyone have any other suggestions on this? It looks fun, but I've run out of ideas. Thanks in advance.