Author Topic: System 11b mpu conversion to 11a.  (Read 1043 times)

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Offline Goingpinsane

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Re: System 11b mpu conversion to 11a.
« on: March 30, 2016, 06:42:25 PM »
We still can't work out the voltage drop. Will a bad Pia draw down the voltage? One thing, the game rom at u26 or 27 was really hot. Can't remember which one. Is this pointing to a bad rom or could something else be causing this? I removed the coil. I got the machine as a project and the pop bumper was not connected. Maybe the last owner knew something and left it out?