You would have to disassemble the unit and more than likely resolder the connection tabs back onto the printed circuit board. This is a surface mount device and these types of jacks are subject to tension by the user under normal operations. I have run into this on many portable CD players etc. As a last resort you may have to replace the jack if the tabs are damaged or suspect. This type of jack should be available at Digi-Key Corp. They are on the web and would be happy to help you select the proper jack -- unless you are lucky enough to get through to RCA and find a part number and/or get the part from them!! Good Luck!!
Glenn Stroeder
S & S Technical Services Ltd.
Saskatoon, Sk. CANADA
Glenn Stroeder, January 2007