This wire is the tieback wire to the small auxiliary
driver board, mounted above and to the right of the main driver board in the backbox.

This small auxiliary driver board holds more TIP102 driver
transistors for the additional coils needed in STNG. This board needs +50 volts for a “tieback diode” voltage for the circuit. The power is connected by a
thin violet/yellow wire which connects to the playfield’s single drop target coil (at the back of the playfield). If this wire breaks, or if some other power
wire in this coil power daisy chain breaks, it can cause the two diverter coils to lock on (after they are first activated in game play!)

(taken from a great repair-source )

And since it can cause problems I always solder 4 diodes directly on the coil.
See http://pinside.com/pinball/forum/topic/sttng-transistor-upgrade#post-1033992

Remove those three wires and solder them together onto one jumper wire, shrink tube the splice and them solder the single wire to the coil lug.

No, only the left button should advance through the options. There is a menu option to control whether the right button launches the ball.

Sounds like you popped the transistors on the your aux driver board... Not uncommon on that game...

From a prior thread...

Jaz

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As usual, Lloyd is most likely correct here. There is a smaller guage purple wire with a green stripe that goes from the aux driver board in the head all the way down to the 4 coils that are controlled. This wire is critical to protecting those drive transistors from getting fried by the coil flyback. That wire easily breaks. Once it does, any of the 4 coils on that side of the driver board (if memory serves it's both subway diverters and the up/down of the drop target), once fired, can blow or weaken the 4 drive transistors. My money says that both diverter coils are locked on and only one has completely melted down so far. And yes, this happened to me.

First thing, find that wire... it goes to the 4 diodes on the aux driver board. It's a horrible design choice they made to wire it all the way down to the playfield when the clamp voltage is already available in the head. Find it and make sure it's still connected to the coil down below. My bet is that it isn't. If it's broke, there might only be 2 transistors fried, but all 4 are weakened. I replaced all 4 just because I didn't want to have to fix it again later. Then replace the coils that are damaged. For sure one subway diverted, probably the other as well. The drop target coil is probably ok.

Post a pic of your aux driver board. I want to see this larger heat sink.

The purple/green wires are all in the right place. No worries there.

--
Chris Hibler - CARGPB #31
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http://webpages.charter.net/chibler/Pinball/index.htm
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