ok i need schooled on my tmnt!!!

dudljoe

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so i got the new stern replacement for my tmnt pins ball kick out and put it in cause it has been missing it since i bought it.. and when i bought it one of the kick out solenoid wires had been cut, so i soldered it back on and powered the machine up and it came on and stayed on so i quickly shut it back off. so i know there is a short some where but not sure where to start and what do i set my multimeter to check it?
 
Don't have a schematic in front of me, but most electronic pins had the same "premise" of a coil being driven by a logic gate, predriver transistor, and darlington transistor.

Working backwards, a coil that fires on power up USUALLY is a shorted driver transistor on the main board. Again, I don't have a schematic in front of me, nor am intimately familiar with DE pins, but I suggest you might look at all your output transistors on your MPU board with your meter set on DIODE.

These transistors are usually TO-220 packages (big transistors, three legs, standing up, metal heatsinks with a hole in them at the top). Do diode tests between the pins in every possible combination - you should either get nothing, a reading between 0.5-0.7 volts, or a "0" (short) - THAT'S the bad one, you should not have any of these shorted.

These DO burn up also, when they have a lot of current go through them for an extended period. Visually check all the transistors, if it looks burned, chances are it has failed. Good luck.

Also, a hint - power up your game with the connectors near these transistors DISCONNECTED. The game should boot without any solenoids engaging. Now, plug in connectors ONE at a time, and find the one that causes the "instant-on". Trace back from the connector to the group of transistors that feeds it, you shoudl find your bad one.

Chris
 
so i got the new stern replacement for my tmnt pins ball kick out and put it in cause it has been missing it since i bought it.. and when i bought it one of the kick out solenoid wires had been cut, so i soldered it back on and powered the machine up and it came on and stayed on so i quickly shut it back off. so i know there is a short some where but not sure where to start and what do i set my multimeter to check it?

If it is the Turbo Boost kicker...cpu board q 43 tip 102 plus its' predriver iirc 2n4401 , also check q5 tip 36c on ppb lower left in backbox. Also the diode on the coil itself 1n4007

Hope this helps!
 
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