I'm sure that schematics reading has been covered in the text of other posts, but a quick search by topic doesn't return anything useful for "Reading Schematics". So, as simple as it sounds, I just want to create a topic on the mattter that is easy to find (and I need advice, too).
When reading a schematic (I'm currently looking at a Gottlieb 1975 Quick Draw schematic), should I "imagine" the current flowing in one direction? It seems obvious at first (follow the line-in / transformer lines), but then some circuits seem to go in a loop of sorts, and I'm not sure if applying directionality is correct in the first place.
Also, since Gottlieb schematics are shown with the machine powered down, but with Player 1 / Ball 1 ready to go, some of the motor / stepper switches are confusing. Am I supposed to read the schematic as "So when you turn the game on, it will be in a ready-to-play state", or "when you turn the game on it will first cycle the score motor and any steppers that need cycled and then you can play that first ball"? It seems to make a difference if I am supposed to know that a switch should be closed while off or that it will be closed if such-and-such happens after powering on.
Obviously, the Hold relay and Tilt Hold relay (and Coin Lockout relay?) will be energized once the machine has power, but do I treat those Hold relay switches as closed / open if the game is on or as they are when the machine is unplugged?
I've already looked over Clay's helpful advice on Gottlieb schematics on Pinrepair, but I just wondered what other words of wisdom the Pinside community has on the matter. Thanks!