(Topic ID: 181821)

$100 Stern Playboy "Fix It" Challenge - Experienced Tech Help Needed!

By xeneize

7 years ago


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#16 7 years ago

Yeah, clearly a power board issue. Could even be an mpu issue. But it's head trouble in any case. The question is, is it resetting due to voltage drop, or noise on the reset line? There's an alteration made on most whitestar CPU boards, but not all. What's your u413 look like? There's a leg you can cut for a higher power variation tolerance. Picture in a minute...

For the curtain, it's probably pretty simple. Just a blown transistor, happens all the time.

#17 7 years ago

Whoops, wrong location. It's U218 on the early style. But see how this leg is cut? Check and see if yours is.

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#18 7 years ago

That being said, I don't think it's a voltage thing, looking at the schematics. The drop target is driven by a different, lower power line. So we've narrowed it to something on the reset line. And wouldn't you know it, u1 on the power board has access to the reset line. It's not a huge deal to socket that, so replacing that chip would be my first line of attack.

#21 7 years ago

Ah, you are correct. I misread them as the drop target being on the brown line. It's still pointing towards the chip in my view, as the drop target only triggers it when hooked to that line.

2 weeks later
#29 7 years ago

I'm still with replacing u1. If it was a power issue, it'd be doing it with other coils.

#31 7 years ago

Well, I'd see if the reset line, pin 1, changes when you fire the auto launch. But to be honest, that would happen no matter what. Because either the reset line is getting bad feedback from that chip (it should just be reading that line, not outputting to it), or the voltage is dropping low enough to make the watchdog send a reset signal. The issue is that a whole bunch of chips touch the reset line. But only that chip touches the reset line and specifically deals with firing that solenoid. I just think it's the best choice. Here's my process of thoughts:

Okay, game resets when a coil is fired. But it's not that coil, because it does it when any coil is hooked to the line. No other coils on that power source trigger it. That means 99% it's not wiring and it's not the coil. That leaves the head. You've tested the transistors and they're fine. What is behind those in the schematic? Small caps and resistors. Unlikely to fail, and even more unlikely to fail in a way that causes resets. So what's behind that? U1, and it has direct access to the reset line. It's where I would look next. But there's no way to really tell. I guess you could cut pin 1, and see what happens, as you're gonna change it anyways. But it might kill the firing of all those solenoids. I don't know why it reads the reset line in the first place.

1 week later
#34 7 years ago

What's the drop target status when you switch with the auto launch? Up or down? Because if it's down, it may be trying to pop up the drop target at startup, and thus firing the autolaunch over and over.

#38 7 years ago

I was under the impression that you changed the transistor and the coil at the same time. If not, you may have fried the diode on your current coil. Try putting on a new one. Remember, banded side goes toward the power source.

Edit: and yes, you may have fried your coil. http://www.pinballmedic.net/coil_chart.html has a list of proper ohms, I think. If not, it may be on the page for that coil at marcospecialties.

1 month later
#52 6 years ago

Now that more than one coil triggers it, and ball search always does, that really points to a low 5 volts. I know you're measuring it on the power board, but it's the CPU board voltage that's the problem. Either something is wrong with the plug/pins that power the CPU, or there's a bad component on the sound and CPU board. I'm guessing the plug myself, as the game had been in a fire, correct? It's the voltage that is getting to that little chip I had you look at earlier that's important. It can be fine on the power board but very low by the time it makes it to that chip. Are the plugs corroded or brown in any way?

#56 6 years ago

Yes, u218. Pin 8 is vcc. I'd measure there.

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