hifi engine

CD 2 Tray Recorder Open/Close Inop

I have read elsewhere that factory presets can prevent either Cd door from opening depending upon a number of variables...Cd left in drawer...unfinalized Cd left in drawer...
(assuming no mech. damage). Can anyone please verify this. My unit is a KOSS CDR200 & appears to be built by Philips. I believe there may be some self diagnostics built into these types of units. Sincerely, civil 6.