When I try to use the functions the secreen comes up with LOCKED. I cannot open the system tray to get out the DVD. I am assuming it is a child lock that has been set in error. Panasonic advised me to push the play key on the remote and the stop key on the unit, yet this did not work, Can you enlightem me so I can use the unit.
Hi sorry for my english ,but i got the solution try to read this carefully. While stopped and “DVD/CD” is the source, press and hold  on the main unit and [S10] on the remote control until “Initialized” disappears from the television. Turn the unit off and on again.default will begin. s10 is the buttom 10 (enter) in the remote control. i hope you will fix it . Alejandro Rosas . from Coyhaique ,chilean Patagonia
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Setting the disc ejection lock
You can lock the disc tray to prevent the disc form
When the main unit is turned off, hold down the STOP
key at the front panel for 5 seconds
If you attempt to open the disc tray by pressing
OPEN/CLOSE key, the disc tray does not open and
“LOCKED” appears in the display window.
To cancel the disc ejection lock, hold down the STOP
key at the front panel for 5 seconds again when the
main unit is turned off.
“UNLOCKED” is displayed in the display window.
Before the main unit is turned off, DVD/CD function
should be selected.
i have a panasonic SA-HT720 and it displayed locked anytime i wanted to eject discs so i found out that dad27's solution was the best and holding down the stop and power buttons also locks the system as well as unlocking it. God richly bless u dad27 u really helped me out