I have a DE sound board on the bench.
During sound test, tests begin to function properly...
...left, center, right sine wave, voice 1, voice 2, music 1...
until I get to music 2. Music 2 and music 3 yield no music at all. Music 4 works properly.
...verified the ROMs
...tried known good ROMs
...made sure that music 2/3 were, in fact, supposed to play music (it is)
...verified the YM2151 and YM3012
It appears that music comes from the YM2151/3012 channel and that voice comes from the MSM5205 channel, multiplexed by the CD4052. So I've been focusing on the Yamaha channel.
Anyone ever come across this?
Anyone have a resolution or suggestion?
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The Place to go for Pinball Repair Info