Audio Systems: swap out Pathfinder radio, amfm cassette, radio unit

Question
Looking to replace current Radio/CD combo unit with same in a 96 Pathfinder. The old one had a problem with the CD eject and even when the radio itself was turned off, the clock LCD  portion stay on as designed but the radio unit still seem to drain the car battery.  I suspected this because sometimes I can hear the radio making sound in the cd tray area like it wants to constantly eject a CD even thought no CD was present and the radio is turned off. Garage totally cut over the power to radio and problem went away. Now how does one remove the old radio to replace with the same (used replacement radio).
thanks in advance

Mark

Answer
ok this are going to be the links for the removal and installation of a new radio

I will also send you the link for a good radio for that vehicle
good luck

installation
http://www.installdr.com/InstallDocs/Toyota/PDF/869017.pdf

radio
http://www.oemautosound.com/pc-19-17-toyota-amfm-cassette-cd-player-changer-cont...