Hi there DarthNuno,
hope your new driver boards work out. If that doesn't solve it, I think the board before that: the A/D D/A board is to blame. I analyzed the motor supplies to be driven by a simple four bit (four wire) control. 1 bit for the motor direction (thus supply polarity) and three bits for motor speed (supply voltage). You can simply test this with the actuators in the center position and making all four bits 'high' (+5 volt), for a very, very short time; the motors should run at maximum speed: so stop in time! Better of course to just measure the supply voltage with the motors disconnected. I do not know if the end switches are connected directly to the power supply or to the A/D/ D/A board... I guess they are not connected to the power supply as the motor test in the service screen can ignore them....
I am also having motor trouble...i am assuming the A/D D/A board is the one next to the motor driver boards with the Encoder plugged in on top. Just spent a long night toying with it and it bounces between saying "Encoder Trouble" for Left and right Motors or saying that they are both fine. My left Motor Driver Lights up but the Right one does not light up and has a painful short that makes my hand numb if i am stupid enough to touch its metal enclosure. Underneathe the encoder there are four dip switches. They were all set to the off position but i cant find any record of what they do. Also, directly next to them is a 4 pin plug that has nothing attached to them(suspicious...). Could you be more specific about the four control wires with one controlling polarity and the three others powering the motor?. I measured various voltages out of the three but if they power the motor then why is there are there two seperate power wires running to them from the motor driver? The motor Driver boards are getting the full AC power from the power supply and some of the 7 pins going in seem to be live with a low current from what i assume is the A/D D/A board...however neither of them will put out any measurable voltage to the motors. That is with the safety lasers connected and/or disconnected. I have tried every combination and all the motor tests say that the motor are good. I can make them move slowly if i take one of the 5v leads coming out of the amplifier and connect it directly to a motor so i know they are ok. Every conclusion i have come to say that it has to be either a safety cut-out issue or that both of the Motor driver boards are blown. I think it is more likely that there is an incorrect signal going from the board to the motor drivers. How can i "set" the three of the four leads going to the motors to 5v? Is that what the dip switches are for?
As for the Audio...I found the audio pin-outs from the main board in the cage at the rear and tried connecting them to one of the speakers directly, but no luck. I checked the power supply to the board that all the speakers connect to(its only label says "SJ25-0091-02") There is a tiny amount of current leaving the board and there is the full AC current going in from the transofrmer. The light comes on when i power it up. I think it must be a signal issue because the speakers are making an annoying humming sound for which i can adjust the volume from inside the coin box.
Another strange thing is that there are two plugs on the side right next to the power supply area(a large green ground wire, and a 2p red and black power connecter) that are not connected to anything. I cannot find anything that they should plug into.
Any suggestions or ideas would be greatly appreciated. Thank you again for the wiring diagrams. They were a great help and if there are any more pages that you could scan i would be very grateful.