This is a trick that I use on S+ and PE+. Was waiting for monitors that were sent away to confirm something. You may have to keychip it but I assume you have it available.īTW the door optics dont use the IO cards - signals go to processor board via the backplane. Sounds like a faulty processor board then - Try a known working processor board in the problem machine to confirm. It seems I am missing 5v at the optic harness with the door open. The drop door has the only jumper, OEM part #XXXX. We have replace all with known working, and have lined up the optics. Micro switch that gets triggered by the top latch of the BV door.Īlso remove the optics and align them manually. « Reply #1 on: June 30, 2010, 09:10:28 AM »Īre you sure you checked all the switches. All new optics and switches, have swapped MPU and mother board, and new I/O's. Have a constant M Door open on a 3902 Game King Slant.