Zinfer
Well-known member
Recently acquired a grail item. Finally! A Frogger. After getting it home and plugging it in however I had trepidations about it. No audio at all. What's a Frogger without sound?
I pulled the old pot off and replaced it with a 2K (had a choice of a 100Ohm or 2k on hand). Not of like kind, and not even close to 200Ohms, but another nonetheless. Still nothing. Checked speaker connections. I'm obviously getting a pop and hum from the speaker at max volume.
Pulled the sound and CPU boards apart. Pulled socketed chips and reseated. Nothing. Pulled the Sound boards Eproms out and double checked them. They're fine. Checked wiring diagrams. Everything appears to be hooked up well. The game plays, no audio at all. Checked all fuses. Fine. Didn't see any broken traces on the boards.
Talked to the guy I bought it from and he said sound was not a problem.
I'm not sure what to check next. Is there an amp or something that could be preventing all audio? I've noticed there are 2 pins at 2P on the audio board that nothing is connected to, but I think that is for some other configuration. The pot is plugged into 6P.
I'm running out of ideas.
I pulled the old pot off and replaced it with a 2K (had a choice of a 100Ohm or 2k on hand). Not of like kind, and not even close to 200Ohms, but another nonetheless. Still nothing. Checked speaker connections. I'm obviously getting a pop and hum from the speaker at max volume.
Pulled the sound and CPU boards apart. Pulled socketed chips and reseated. Nothing. Pulled the Sound boards Eproms out and double checked them. They're fine. Checked wiring diagrams. Everything appears to be hooked up well. The game plays, no audio at all. Checked all fuses. Fine. Didn't see any broken traces on the boards.
Talked to the guy I bought it from and he said sound was not a problem.
I'm not sure what to check next. Is there an amp or something that could be preventing all audio? I've noticed there are 2 pins at 2P on the audio board that nothing is connected to, but I think that is for some other configuration. The pot is plugged into 6P.
I'm running out of ideas.