The quick and dirty answer to this question is: just get in there and start unscrewing everything in sight!! While it can be a time consuming process, Optigans are not that hard to take apart and your intuition should guide you pretty well. Since disassembly varies for the different Optigan® cabinet designs, I’m hesitant to try to write down step-by-step instructions on how to dismantle each kind of Optigan. But eventually I’ll have a .pdf version of the Optigan® Service Manual available for purchase, which has lots of great exploded view diagrams to guide you through the process.