Can I get the CD cartridge out of an unpowered CD changer?

I took the Sony cd changer out of my car, forgetting to eject the cartridge beforehand, so now I have 10 CD's stuck in it. Is it possible to unload the cartridge without re-powering the CD changer? Or if it needs power, which pins are the power pins, and can I just apply 12 volts across those pins tp power the CD changer unit?