1. Put player in standby mode using the Power button on the remote
2. Hit TITLE then CLEAR then the POWER button.

I did this and it took me to a System Diagnostics menu where I could look at anything and everything about the DVD player but I was unable to change the settings. This also works on other NS series players like the DVP-NS300 series. If anyone knows how to change the settings, please let me know! Thanks!