Hi, as far as I remember, the MDX-E300 is technically similar to the MDX-M5. I repaired such an unit some time ago, it had a different MD mechanism than the two decks I mentioned above. I never managed to get any service manual for a Yamaha MD deck as pdf file, I only own a paper copy of the MDX-9 service manual. You can obtain these manuals at www.schaltungsdienst.de, prices are around 15 €. Greets, Dirk