This item replaces a faulty KHM-420AAA UMD drive on a fat 1000 model Sony Playstation Portable. If your PSP does not read discs, reads discs slowly, the picture keeps freezing, or is just making noises when reading discs this is the part for you. This item includes the laser, the motor that spins the disc, and the metal cage that holds the disc. Requires a near full disassembly of PSP, professional installation is recommended. Replaces KHM-420AAA UMD (universal media disc drive on 1000 (FAT) model PSP's so that they can read discs again Same as original for easier installation ( Must remove anti-static solder point) used to replace the broken or faulty laser head for Fat SONY PSP 1000 (not  for PSP slim) Professional installation is recommended. Does not fit 2000 Slim model PSP