I have got hold of a Sega slot machine which is mechanical with some electrical parts which I haven't come across before. My problem is that the solenoid which operates the lever so the arm can be pulled when a coin in inserted is noisy and buzzing loudly. To start with there's a transformer with 220 on primary side, with 110 volts on the secondary (for the fluorescent lights) and 48 volts AC which is wired onto a half wave rectifier, 6 volts AC and 28 volts AC. The main area I am interested in is the 28 volts AC which powers the solenoid according to the circuit diagram on the back. I have measured the voltage when the solenoid is operating and it measures 19.5 volts AC, the resistance on it is 5,5 ohms, nothing marked on it indicating specification. I have cleaned the solenoid but no difference. Just wondering - would the lack of voltage cause this? It's unusual to get a voltage drop from a transformer or is it possible that the solenoid is faulty? Apart from that the machine is playing and paying out fine.
There are a few other components towards the back of the machine that I am not sure of. One is a rotary dial, the other a type of relay with a number dial on the side of it. May be related to jackpot payments, but not sure. I will post some photos.