Search results for query: field ground

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  1. andrewb

    How to deal with a "noisy" room

    Or perhaps there's magnetic aggregate in the concrete. Aggregate is basically just crushed stone, dug out of wherever it can be found locally. If it was pulled out of a place with a high concentration of magnetite or hematite in the ground, that stuff is going to be in the walls. Rebar...
  2. andrewb

    Millipede increasingly louder and louder hum [RESOLVED]

    Those are field grounds. They are for safety only. They connect to exposed pieces of metal (that the player could potentially touch), so if those pieces should ever become live because 120V shorts to them, the field ground would short that voltage to ground, so it doesn't go through you...
  3. andrewb

    I, Robot #158 Restoration

    ...touching in order to work (or very close, because in the RF world, very close is effectively touching). And your RF cage should have a field ground connected to it. The solution is to use your scope to measure and isolate where the noise is coming from. This shouldn't require guessing...
  4. andrewb

    Yellow ground wire ribbon cable go where?

    ...is like a language. The more you do it, the easier it gets. Just take your time and go slow. It'll get easier. Normally, no. Field grounds are mostly only connected to exposed pieces of metal on the outside of the cabinet, that a player could potentially come in contact with. The...
  5. andrewb

    Yellow ground wire ribbon cable go where?

    This is another example where the schematics contain the answer to your question. The yellow wires are called 'field grounds'. They are not electrically required for operation, but rather are there for safety. Search for 'field ground' to read more about them. Here, I'll do the search...
  6. andrewb

    ssdsds

    The green wires are called field grounds. See here for an explanation: https://forums.arcade-museum.com/threads/crystal-castles-cant-start-game.505917/post-4497735
  7. andrewb

    Are EMI filters often bad out of the box?

    ...So that could be masking the problem. A 120V line is two wires: One is hot, and one is neutral. (And the third from the wall is the Field Ground, but that's separate from the two that connect to the 2-wire monitor power input.) Your original hypothesis is that something was bad about...
  8. andrewb

    Are EMI filters often bad out of the box?

    ...that shouldn't be (or something that shouldn't be, that is. ) Or something that is grounded to the wrong place, mixing up ground and field ground, etc. Are the monitor frames grounded differently in the two cabs, etc. Did this cab ever work right, or has it been this way the whole time...
  9. andrewb

    Millipede/Crystal Castles Marquee wiring info needed

    ...side of the cab (if you're looking at the cab from the rear). 6 wires run up the left, and 3 of them branch off for monitor power and field ground. The other three (120V hot, neutral, and field ground) run up to the marquee area, where they terminate in a 3-pin Molex with female pins...
  10. andrewb

    Need help understanding proper grounding.

    Do an advanced search for 'field ground' in posts by me, if you want to learn more about this. Here's a link to a page of search results. (I don't know if these links are good forever, so it may expire.) https://forums.arcade-museum.com/search/591295/?q=field+ground&t=post&c[users]=andrewb&o=date
  11. andrewb

    Sad day. Dig Dug AR magical smoke.

    It just isn't necessary. There are no design flaws like what you're describing that warrant such modification. That's my point. Just because something 'works', doesn't mean it's the right or best way to solve a problem. You want solutions to be as simple as possible, and no simpler...
  12. andrewb

    Crystal Castles can't start game.

    Also, that green wire is a Field Ground. You'll see more of them, and they all run together and connect to the outside of the brick. Those are for safety. They connect to all exposed metal parts on the cab. Just in case any of those parts were ever to get accidentally electrified, they're...
  13. andrewb

    Star Wars Tinkering Help

    ...bumpers. Maybe search for other threads here to see what people use as replacements. - The ground wire doesn't go nowhere. It's a field ground that is connected to the yoke metal via that clip. That green wire runs out of the yoke, and joins up with all the other green wires, which are...
  14. andrewb

    Atari Power Brick ID

    ...really needed to make the game function though, it's just a safety feature (and also just a legal/CYA provision). It's just where the field ground wires connect on the brick chassis, which come from all of the exposed metal parts of the game, which theoretically could become electrified if...
  15. andrewb

    Yet another Asteroids Deluxe hum thread

    The ground wire (aka field ground) is just a redundant safety ground, that is tied to all exposed metal parts of the cab. It is meant to protect a player, should any part of the cab become electrified, which is extremely unlikely. It does not play any functional role in the operation of any...
  16. andrewb

    Starting Dragons Lair build

    Field grounds are just there for safety purposes, and aren't critical to the operation of the game. They're meant to provide a path to ground for any exposed metal surfaces, in case they accidentally get electrified somehow (which really isn't easy), so that the ground sinks any potential...
  17. andrewb

    Atari AR Sense eliminator...yes or no?

    Yes, we will keep beating. Because your facts and analysis are not correct. (Which is basically "There are lots of burned-up AR's out there, so that means they're flawed, and I have a thing I do that makes me not see the problem, so that justifies that they're bad.") You're oversimplifying...
  18. andrewb

    Weird extra ground on Space Duel power supply? (Solved!)

    It's just an extra field ground someone added. It isn't needed. Remove it entirely.
  19. andrewb

    Weird extra ground on Space Duel power supply? (Solved!)

    It doesn't look like a factory wire, but if it's just a field ground, it goes where the other one is connected, as shown in your pic. (Just connected to the metal frame of the brick.) What is the other end of that wire connected to?
  20. andrewb

    Should this ground wire be connected?

    It's most likely a 'frame ground' (i.e., 'field ground') wire, which is there as a safety mechanism. All exposed metal parts in a cab get connected to ground, in case they accidentally become energized. I'm not sure exactly where they go in an MK cab, but sometimes there's a 'FG' terminal on...
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