Http://static.fixya.com/Manuals/N/NEC/NDT44_DVD_Pl_A99F03B9FF64B4BBCEA7CE8E733398F8.pd
The manual is above.
If that doesn`t help have a read of the following
http://www.ehow.com/how_2036282_remove-dvd-player.html
Lock/Unlock DVD player
• To lock player, open tray and press SETUP, 0, 0, 0, 8, 3 (an on-screen message, "Key
Lock On" is displayed).
• To unlock, press SETUP, 0, 0, 0, 8, 3.
This from another RCA manual but may work
Cheers
mickypics71
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