This Sony PS2 SLIM SYSTEM SPU 3170 laser lens suits for your PS2 if it has following problems:

Products Detail:
SPU 3170 laser lens is compatible with PS2 system model: SCPH 700xx model or PS2 version 12(Slim version).
System shows a message "Disc Read Errors" or disc appears damaged or dirty on the screen.
System loads games or movies longer than normal.
System reads games or movies and seems to be freeze or skipped