This thread scares the he!! out of me.

You've replaced twelve ICs and two other components without having a clue what the problem is?????

And, since D25 is reading exactly as it should, it seems pretty obvious to me that you should put the soldering iron down and get professional help.

Or, heck you're close enough now, why not just replace all the rest of the ICs on the board. After you've finished, send this guy a pile of cash with your board...

www.coinopcauldrin.com

--
Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com

Absolutely not. Note the link.

Absolutely. It's always a good idea to compare to a known working circuit before pulling out the soldering iron.

--
Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com

Ahhh. Well socketed ICs certainly change things since they can be swapped without risking damage to the board.

Logic probes are very inexpensive and an invaluable tool for troubleshooting pinball boards. I use mine far more than an oscilloscope.

--
Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com