BTW, Pac-Mania does have stereo sound. The dedicated cab was NOT stereo so the sound is jumpered together and just played out one speaker. If you play it in a stereo cab, remove the STEREO/MONO jumper and plug the 2nd speaker into J106.
Symptom on board 1: no sound
Visually inspected board. LA4460 audio amp at U7 was visibly blown open. Replaced the amp (used some thermal joint compound between the amp and heat sink). We have sound! Thanks to Riptor for clearing out what I thought was a blocked through hole. Just needed more heat.
Symptom on board 2: sound, but not always the right sounds. Eating a ghost jams an annoying sound on that does not go away until you power cycle the board!
Visually inspected the boards. Nothing noticeable. Swapped board halves with my now fully working set to isolate the problem to the main board. Looked at MAME code and found that the sound section is in ROMs S0 and S1 (maybe for sound? Duh!). Swapped out S0 with a known working EPROM and the problem was solved. Erased the EPROM and tried re-burning a few times with no success. Burned a new EPROM and now I have two fully working Pac-Mania PCB sets. Yay!
Symptom on board 1: no sound
Visually inspected board. LA4460 audio amp at U7 was visibly blown open. Replaced the amp (used some thermal joint compound between the amp and heat sink). We have sound! Thanks to Riptor for clearing out what I thought was a blocked through hole. Just needed more heat.
Symptom on board 2: sound, but not always the right sounds. Eating a ghost jams an annoying sound on that does not go away until you power cycle the board!
Visually inspected the boards. Nothing noticeable. Swapped board halves with my now fully working set to isolate the problem to the main board. Looked at MAME code and found that the sound section is in ROMs S0 and S1 (maybe for sound? Duh!). Swapped out S0 with a known working EPROM and the problem was solved. Erased the EPROM and tried re-burning a few times with no success. Burned a new EPROM and now I have two fully working Pac-Mania PCB sets. Yay!
