I have a Sony NS 300 DVD player and used the command " Pwr donw to standby, then press title, then press clear, then power on " I enterd the diag screen with no problem. I programed another remote so I could use the 0 - 9 buttons and press 0 to exit. It appears to not exit until I power off then on again. However the only problem I have with this is that upon entering the diag mode the first time I lost the display on the front of the unit and cant get it back. Any help would be appreciated.