So I got a Pinbot and I am not getting any music.

Music test - nothing works as I scroll through each effect
Sound test - all works ok.

One thing, when reading the manual, it states to go to the music test and then switch to Auto-up so that the display shows music off. It never shows music on - it is suppose to?

I have replaced the caps and voltages and have verified that the op amps and PIA are good. Unfortunately I don't have another game I can swap the board to see if it is the sound board or the CPU, but I doubt that there is a problem with the CPU since the other sounds are working, or am I wrong?

Yes, and thank you for your suggestion.

Should have also mentioned that I rebuilt the power supply and resoldered all connectors on all boards. This machine was a basket case when I got it (nothing worked). But have it now to the point where it will play, just no background sounds.

I also replaced the ribbon cable between the MPU and the sound board. Also verified that U4 is good using the BIN file from IPDB.

Yes, I get 2 bongs at startup (I believe this is normal) - ribbon cable is good (I tried a different known good one).

Hmmm. OK thank you for the replies.

So the sound board in the Pinbot I have is labelled as D-11298-549 - I know the -549 is Pinbot

Should U19 be populated? The manual states that it should be installed can anyone verify?

Recommended source for a TMM2016AP-15 (or replacement)?

Ok, so the RAM seems to check ok, swapped it with the one from the MPU board - no change, game has 2 bongs at power on, plays as normal but no background music.

Maybe an issue on the MPU board - does anyone know what board is responsible for the music? I assume the sound board since the EPROM label on that board says music.

I just want to update this in case someone else is having the same issue and does a search.

SOLVED

Looks like the 68B09EP Processor on the sound board was the culprit despite getting the 2 bong (RAM error) startup error. Guess I am now violated the warranty void if removed label. lol