(Topic ID: 163754)

Why do I always unplug the main power chord (?)


By rolf_martin_062

2 years ago



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  • 14 posts
  • 11 Pinsiders participating
  • Latest reply 2 years ago by JoeNewberry
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    aSafety-snippet_(resized).jpg

    #1 2 years ago

    Hi
    I refer to the picture and the snippet of schema (post-1 and post-2): https://pinside.com/pinball/forum/topic/williams-jubilee-gi-lamp-fuse-pops-on-start-up -

    Lets assume I want to work on the "power-side" of a Williams pin like the "Jubilee". I toggle-off the main power switch - with one hand or with both hands I grab the 24 VAC fuse - accidentally I touch the fuseholder of the 110 VAC main power line --- what happens ?
    110 VAC may flow through my body to earth / 110 VAC may flow through one hand, arm, body, arm, hand --- definitely "NO good".
    Look in the picture - encircled red is the 24 VAC general purpose fuse (it is NOT the fuse for the bridge rectifier) - and JUST below is the 110 VAC-10-Amp fuse.

    Look at the snippet of schema (110 VAC side, on top of the snippet) --- FIRST is fuse - SECOND is main power toggle-switch. You can toggle-off --- BUT the fuseholder / fuse HAS POWER.

    So when I work on a pin: I ONLY plug-in the main power-chord when I NEED power for to do some tests. Greetings Rolf

    #2 2 years ago

    I thought maybe this was a reference to unplugging a game during a thunderstorm. I always do that.

    #3 2 years ago
    Quoted from dmbjunky:

    I thought maybe this was a reference to unplugging a game during a thunderstorm. I always do that.

    Unplug an EM? geez... maybe if you live Florida with no good grounds..

    #4 2 years ago

    My midway gun game was switched on the ground side-- not the hot, so i was getting 110 shocks . Crazy thing was the factory schematics had it designed that way. Fused and switched that incoming 110 post haste.....

    #5 2 years ago
    Quoted from pinhead52:

    Unplug an EM? geez... maybe if you live Florida with no good grounds..

    Surge protectors only really protect from the power companys mild spikes, if lighting strikes your yard, your earth ground connection(rod going 6 foot in the dirt) becomes overwhelmingly negative instead of positive for a breif moment. And since neutral is bonded at one point to ground in your home wiring- neutral is essentialy ground, therefore your ground and nuetral connections will spike with MILLIONS of volts, clamping voltage on "good" surge protectors are around 4 to 8 hundred, lightning bolts will laugh at that and put millions of volts on anything in your house pluged in the wall for a few nano seconds. Having a "good" ground in this scenario is actually your worst enemy.

    #6 2 years ago

    Hey smokey hows my old night moves treating you? Id love to buy back if you ever decide to sell.

    #7 2 years ago

    I always unplug my games when working on them after my two year old nearly electrocuted me by turning my game on with my hands in the backbox.

    #8 2 years ago

    I'm the kind of guy to fiddle around with the game completely active but yet when something looks too daunting I unplug it, lol. As long as you're smart about it and don't bump anything you tend to be alright, and of course avoid the transformer like the plague. I'm used to working in my late 60's Gottliebs like that but when I work on my 1966 Mayfair (which I rarely do) I always try to unplug it as it seems there's a hell of a lot more 120 flowing through the circuitry there than the ones newer by only a few years. I'm not sure if games like Airport (1969) even utilize the high voltage besides for transformer voltage, sure doesn't seem like it. I'll have to grab a schematic sometime.

    I worked on a 1974 Bally for a friend once with the power on and did catch coil voltage a few times in the backbox and that hurt enough to be a slight annoyance but it definitely wasn't 120. Was it 30 or 50 volts at that point, as I've never felt that at home? (Only Bally I own is in pieces)

    Quoted from Hougie:

    I always unplug my games when working on them after my two year old nearly electrocuted me by turning my game on with my hands in the backbox.

    LOL, ouch!

    #9 2 years ago

    Hi
    I show a snippet of schema made from: https://pinside.com/pinball/forum/topic/1963-williams-beat-the-clock-repairs#post-3192582 - in that topic I suggested: Mount a new Line-Power-Toggle-Switch BEFORE the fuse. Mount it encapsulated / covered - here I add "put a paper tag at the switch telling: ALWAYS LINE-CURRENT".

    These early-1960ies pins ARE dangerous - Line-Current "at hand" all around - everywhere. Greetings Rolf

    aSafety-snippet_(resized).jpg

    #10 2 years ago

    Ohhhhh, I see why they might have done it now. Probably for the service outlet, and they don't want to run the service outlet without the fuse, so it ends up running through the fuse block too.

    #11 2 years ago

    Unplugged power chords? No way. They only sound good on electric guitars.

    #12 2 years ago
    Quoted from Circus_Animal:

    Unplugged power chords? No way. They only sound good on electric guitars.

    ( Rolf - in case you miss the joke here:
    Chord = Music
    Cord = Electric wire )

    #13 2 years ago
    Quoted from RCA1:

    ( Rolf - in case you miss the joke here:
    Chord = Music
    Cord = Electric wire )

    And "schema" is "schematic."

    #14 2 years ago
    Quoted from EMsInKC:

    And "schema" is "schematic."

    Indeed. I kept thinking this was just a European vs American naming convention thing, but it seems not. The Internet is always there with a detailed comparison:

    http://the-difference-between.com/schema/schematic

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