skydiverbc2

I am trying to help someone with their Royal 300 vendor that is not functioning properly (vending every other can, coin mech issues, etc). I am trying to find a manual for this machine but it seems like the 300 does not exist. I can't find anything for it. The name plate clearly says "Model 300", it has 7 buttons, and I don't believe it has MDB. Is anyone able to shed some light on this machine and point me in the right direction? Thanks!