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Most CD trays have a small hole at front for you insert a straightened paperclip about 1-2 mm inwards. This allows release of tray when power is off. I assume this is what you mean by mechanically locked, not locked by software.
In response to your jvc-a75r DVD player, sometimes the solution might be less complex than it may appear. Had the same problem with my Samsung s321,the machine refused to read DVD's but would play CD's no problem. Simply opened up the cover(usually)4-6 small screws, and found my dog's hair inside of the player covering the laser eye.Electrostatic ionization
attracts dust,etc. into the player remarkably well sometimes. Carefully used a cotton swap to remove debri. PLayerworked fine afterwards
...Good luck!
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