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Pinball problems are commonly discussed on pinball forums. For your case go to http://pinballbash.com/forum/index.php?topic=2526.msg23570#msg23570 and look for a very long append from VisitorQ. He gives a nice detailed description of the possible causes.
This machine is based on the Williams System 7 MPU. There are schematics available online as well as debug guides. I don't know how comfortable you are with debugging electronics. If you can't do this on your own you can try to post a request for help on an active pinball forum like www.pinside.com or look for a local pinball repair person. You can either ask for a reference on the pinball forum or search for one on Craig's list.
You need to describe what you mean by "locked up". If you mean mechanically locked and you don't have the key then you will probably have to drill out the lock. Sometimes people will screw a spare key under the cabinet but if so consider that a lucky find. If you mean electrically locked up such that you turn it on and it does not initialize correctly then you need to describe exactly what it does. Quite often these old electro-mechanical models will go into an endless loop trying to reset the score reels to zero. Even if they display all zero's the machine might not be detecting it properly. If so you can open up the back (also called the head) and clean each and every switch with a business card (to clear accumulated carbon from the contacts. The score reels are removable. If you are not up to this you can go online to a pinball forum (like www.pinside.com ) ask for a local pinball repair person. You would be surprised at how many of them are out there.
Make sure there is the proper number of balls in the trough. If so remove them and go to the test switches in the diagnostics menu. Test the trough switches one at a time.
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