Clean memory pins and the board around it, if your board has a layer of rubber or varnish, clean it with a toothbrush and Thinner. You could remove the rubber smoothly on the board using a screwdriver first.

Protect or cover with paper tape all components around the PLCC memory.(as shown in the picture).

Tin each side of the memory. Don´t be afraid ! Make a big line of tin on pins. When you add more quantity of tin you reduce to zero the risk to damage the board.

Now, hold two soldering tools (each one by hand) and heat two sides of the memory moving and heating all pins. Heat the other two pin lines of te memory too. Alternating this movements you can heat four sides of the memory and take it out.

Clean the board with soldering tool to remove big pieces of tin. So remove the cover tape.

Clean the board with a toothbrush and Thinner.

So remove the remaining tin with a copper wick (tape tin-remover) and clean it with thinner again. Take care ! Don´t heat the board too much.

When the board is clean place a PLCC socket. Look the pin number one position of the socket be in the same position of the original memory !.  Now weld pin by pin the socket on the board. (as shown in picture).

Plug the intelligent socket in right position to finish!.