Nice looking machine!

First, be careful manipulating the machine when it is plugged in! If you look at the schematic there is a lot of circuitry that is running at line voltage (everything above the transformer in the schematic).

After plugging in the machine, you can press the left flipper button to power it on, or drop a coin. No need to push the lock relay.

If you are keen to learn, go to http://www.pinrepair.com/em and start reading!

You may want to check fuses for continuity using a multimeter.

The score motor runs until the machine completes its reset sequence, so it is normal for it to keep chugging along if the machine will not reset.

Try to change the score to "1111" (you can manually move the solenoid plungers to do so). Power up the machine and drop a coin. Do any reels reset to 0?

While this is happening, if the Reset relay is holding energized here are the switches that could be causing that.

Pinball (resized).png

The Relay Bank keeps resetting unnecessarily. Here's the relevant part of the schematic:
Magic City Coin relay (resized).jpg
The Relay Bank Reset solenoid (bottom right) fires once per 180 degree motor cycle only if the normally open switch on the Coin Relay (in the red box) is closed. I think the Coin relay should fire briefly to reset the Relay Bank just once, and then relax before the Relay Bank resets again. So either the switch in the red box is stuck closed, or the Coin relay is stuck on.

If the Coin Relay is on through all of this carefully examine the normally open switches in the Coin Relay circuit (in red). It's possible that either the 5 cent or 10 cent (or whatever coins your game is set up for) switch is stuck closed. They're just below the coin mechanisms on the coin door. If those look ok, examine the normally open switches on the Game Over relay and the Ball Unit to make sure they're open too. If in doubt you could slip a small piece of paper between the contacts of each of these switches to see if any of them lets the Coin relay relax once they've been forced open.

/Mark

But the Coin relay won't drop out until the Game over relay changes state. The G.O. relay is forced on as long as the Lock relay is not energized or any normal tilts are stuck closed.
mcgo (resized).JPG

The Lock will not hold in if any kick off switches (Slam switch on bottom board) is open (should be normally closed).
mclock (resized).JPG
But RESET will never release until all 4 score reels are at zero (see lowest switch on snipet above). So, the OP should manually set all 4 score reels to 0 first (you can see in the OP's video that the score is sitting at 1000) and see if the reset cycle will end after coin drop. Then, he can see if the score reels can zero themselves if set to 1,111.

Oddly enough, Magic City would appear to NOT be one of those games that pressing the left flipper button will turn on the lock relay (and light the lights).

That's a nice looking machine, one of my favourite Williams from that era.
I tend to agree with the other replies. The machine cannot enter game mode until it has completed the reset sequence. Check the suggested switches as shown, and certainly take time to read through the Pinrepair EM section on the site.

Word to the wise too, DONT be tempted to begin cleaning and adjusting random switches unless it is necessary. Unless you are au fait with EM servicing,etc then you can easily end up putting more faults on it that those you are trying to fix. One fix at a time!

Is that the 1s or the 1000s that doesn't reset?

The dangling wire looks like a heavy, yellow wire with no tracer (2nd color). If that's the case it's likely one of the solenoid/relay power rails that daisy chains its way through many switches. In your photo you can see two yellow wires soldered together on one switch tab on the middle score reel. Could the dangling wire have broken free from the other yellow wire on the left most score reel? The dangling yellow wire seems to be bundled right next to the other yellow wire which could be another clue.

All solid yellow wires are the same. No harm in connecting it to the other one. Use an aligator clip jumper and see what happens.

Inspect and diagnose this circuit with Alligator clip jumper wires. Anybody know why the Ball Count unit is involved?

Pinball (resized).png

Ball count is a mystery. Perhaps in case some ends a game with balls remaining and they wanted to wait until the ball count stepper went to zero before sdding the 1000's reel?

PM me about your backglass as i might be able to fix that for you.

Hello, I have the exact same problem with my Magic City, the '1' in the thousand position won't reset to zero. what fixed this?

thanks,

Hank