Quoted from jj44114:Scope for pinball? Not usually worth dragging out.
I do about 90 percent of pinball troubleshooting with a good DMM....including logic signal tracing. If you need to trace an analog audio signal through an amplifier circuit, the only tool you can use is an oscilloscope.
I have an ANCIENT BK1477 for that. If needed I can borrow a Tectronix digital storage scope from work. I've only needed to do that once in a decade of working on pins. They are easy.