I own a TSPP. Recently my game has started randomly displaying a Checksum $F0FF code during attract mode. At the same time a "beep" is made and the TV display says "TEST". I installed a Color DMD roughly a year ago and haven't had any trouble since then. Not that familiar with diagnosing codes on this era of Stern machines. I'm curious if any other owners had have similar experiences. Game seems to play fine, doesn't seem to matter if I reboot the game. The beep is the annoying part.

Just those symptoms. And from what I see, it's random.

May have found the cause of my problem. Like I said, was getting an error code and it was totally random. Game was still playing "right". Played it bit more and started getting some strange messages along with a very sensitive tilt. So I opened the coin door and found that the documentation or more precisely the bag that it is in had shifted to a location where it was in contact with the tilt bob. It wasn't completely fouling the bob but was oh so close. IOW, the slightest movement would cause a light contact. I've played a few games and left the game powered up for a while. No more error codes are being shown. If this isn't the complete issue, I'll be back for more advice. Had this game for some time and besides replacing some of the light bulbs on the playfield, game hasn't been a problem at all. A couple of the bulbs are a real joy to access if you've had the experience.