This machine? http://www.pasocomclub.co.jp/img/1100000191308-1.jpg
If so, remove the thumb screws on the back, then remove the side panels. That will give you access to the drive mounting screws and connections.
This machine? http://www.pasocomclub.co.jp/img/1100000191308-1.jpg
If so, remove the thumb screws on the back, then remove the side panels. That will give you access to the drive mounting screws and connections.