Before digging too far into the problem, I would be glad to get a confirmation (or not) of an assumption.
On the triac board (see pic):
- Input 25 Vdc connector j1, corresponds to sol24
- Input 26 Vac on connector j2 violet wires come from the Aux power driver board
- Output 26 Vac connector j3 violet wires go to the blower
The 26Vac goes from j2 to j3 provided the triac gate is actuated. The gate is triggered by U1 receiving its input from j1, defined as solenoid 24. I presume that when sol 24 transistor (Q4) grounds the circuit, the gate is actuated.
At machine start (blower not activated), the red wire of j1 measures 30 Vdc, the gray/red close to 0. Here I am surprised ! I would expect the same voltage as the red wire. So when the blower must be started, the transistor Q4 grounds the circuit. The same 0 value is measured on its originating pin of j5 (sound overlay solenoid board).
If I measure the wire gray/orange (flasher sol 23) on j5 of the sound ovl solenoid board, I get about 30vdc.
My first question is: should’nt I measure 30vdc on the gray/red wire of J1 on the triac board at game start ?
Any help is welcome