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Message: <blockquote data-quote="Worf" data-source="post: 47635" data-attributes="member: 1047">Only things I can say are:1) Check for the williams dot (it's the dot that shows after the credits - e.g., instead of saying "Credits 0" or "Free Play", it'll say "Credits 0." or "Free Play.". If you play the iOS version, practically all Williams tables have the dot. I think it's only MB or so that doesn't. Android and other platforms I've seen don't have the dot). The dot indicates the machine has detected a problem - get into the operator menu and see the test report.2) Take the glass off and run through the switch tests, especially if any are indicated. If you want, play through the pro mode of STTNG on TPA to get familiar.  Roll the ball around to get a sense of how it rolls through the playfield. Bring a clean pinball or two - if the unit isn't shopped and the balls are cruddy, don't use those! Though, at the prices they're charging, they really ought to have shopped it.3) Check lamps - because those are things you'll need to replace. Even if it was shopped.4) Open the backbox. Inspect the WPC board ESPECIALLY around the batteries. If there's battery gunk on the board, this may mean having to change the WPC board. Points if they took the battery holder out and put it on a remote holder5) Inspect the board connectors - check for burned connectors. Check the connectors after you played many games on it - they should be warm, but not hot. Hot ones indicates connectors that may fail. Also check the connectors - they may be slightly discolored, but should have no obvious signs of burning or wide scale discoloration (the connector may yellow due to age though, but it should be relatively even).6) Inspect the boards for discoloration or burn marks. Burned out components or overheating components will require repair. Small discoloration is OK (natural), but large areas of char or large areas of discoloration around components, not so much.7) Inspect the transformer for the same reason - burned components are nasty, and a burned transformer doubly so because it's a very critical part of the whole thing and expensive. Again, small discoloration OK, large amounts of it, not so much. Especially if there are clear burn marks.8) Check the wiring all around - make sure they're routed nicely and not pinched and not burned or discolored/melted. Likewise, while checking coils, ensure they're the same as well.TO prepare yourself, avail yourself to resources - TPA, the manuals, etc. You may even want to google the table to see if there are any issues to be aware of that you should inspect - broken parts, common failure parts, etc.</blockquote>

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