Local operator brought me his monopoly to clean up and play. Sound is messed up. He purchased sound roms and I replaced them but no change. Here is a short video of the noise/issue.
(Topic ID: 181010)
2 weeks later
this may help http://mirror2.ipdb.org/files/4505/Stern_2001_Monopoly_Service_Bulletin_133.pdf
I would also update display and cpu ( manual is wrong on size for CPU should be a 27C010/27C1001 1 meg not a 4 meg) The display chip is indeed a 27c040
http://www.sternpinball.com/games/234/mon
that is the cheap and easy stuff to do first.
I note that the bulletin is to address a problem for a hum below volume setting of 4. This seems to be different. This is an extremely loud hum. The game sound is there, but muffled under the loud hum. I also note that the hum also has a second cyclic hum that flashes with the GI in attract mode. I would love to have another game close by so I could diagnose it.
4 weeks later
Matawan, NJ
It seems like either one of the 2 amplifiers are blown. U102 or U101. One amplifies the backbox speaker and the other amplifies the cabinet speaker. Can you tell if the muffled sound is coming from the backbox or cabinet speaker by either listening closely or disconnecting one at a time at the speakers themselves and see if the muffled sound goes away?That would help narrow down which mosfet is bad.
Thanks. I've given the board to Rob Anthony to work on it. Hopefully he will solve the mystery. Ill post it here when I get the board back.
2 months later
Quoted from Nevus:Thanks. I've given the board to Rob Anthony to work on it. Hopefully he will solve the mystery. Ill post it here when I get the board back.
Thorold, ON
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