(Topic ID: 196942)

Wms System9 Solenoid Fires At Start Up

By RAC85

1 year ago

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  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by RAC85
  • Topic is favorited by 1 Pinsider


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tip102c (resized).png

#1 1 year ago

I’m working on a Williams Space Shuttle, (System9). After spending way too much time and effort I’ve got the game playing fine—with the exception of an annoying problem at startup—the ball server solenoid ALWAYS fires once when the game is powered up. Otherwise the solenoid works as it should during game play. According to the owner, the machine, has ALWAYS behaved this way.

I’ve researched this issue online, but can’t seem to find anything definitive about the cause or the solution --everything from loose wires on the coin door to stuck switches. The Williams troubleshooting guide mentions this problem and offers four possible remedies: (1) coil TIP output transistor, (2) solenoid diode, (3) pre-drive transistor, (4) the QUAD AND chip (7408).

The TIP transistor is fine (new), the diode is fine,(new) and my assumption is that the drive transistor is fine (have not pulled it to check) because the solenoid works fine during game play. On the long shot that the 7408 has a single gate that has failed, I’ve ordered a new 7408IC.
tip102c (resized).png
Should the 7408 not solve the problem, can anyone offer some potential area(s) to look? I’ve done all the obvious things (re-seated chips, connectors, etc) but at this point I’m running out of ideas. Attached is a snip of the schematic. U57 is the gate, TIP122 is drive, SOL2 is the ball server. Any insight would be greatly appreciated. I’m a klutz.

#2 1 year ago

Are you talking about the ball kick out to the shooter lane? Mine did this when I had too many balls installed. Should be 3 on Shuttle. Just throwing out the obvious answer first since I didn't see you mention it, you might have already checked for that.

#3 1 year ago

Thanks Futurepinhead for taking time to read the post and offer up an idea!

Yup, there are three balls in the game and all the ball switches seem to be working just fine. The problem ONLY occurs when the machine is first turned on. Between games and during games its works fine. I'm stumped! I need some of the smart guys in here to help me untangle this one. I'm sure the game didn't leave the Williams factory like this!

Thanks again for your post.

#4 1 year ago

I'd be tempted to take a look at that SR1 resistor package, SR1-3 or 1-5. I can't quite make it out in your drawing there. Those things seem to be responsible for lots of odd behaviors.

#5 1 year ago

Thanks Toyguy!!

Well the AND gate did nothing! So I've ordered the resistor packs. I'll pull the whole thing and replace SR1 and SR2.

My assumption is on powerup the SR1or SR2 is open and perhaps looking Low and thus causing the driver to trigger. I'll let you know in a few days--BTW, Marco stocks em. Thanks for contributing.

#6 1 year ago

Whoops-- I mean to say SR1 and SR3 Not SR2.

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