If your IR Sensor is no longer working, you can attempt to replace it, however, it will in no way affect the performance of your Blu-ray drive. Only the KEM-400 optical drives have IR sensors for discerning when discs are inserted into the Blu-ray drive. Depending on the type of Blu-ray drive you have, you will need to either follow this guide or this guide. Realigning the gears in the blu-ray drive is fairly simple. Re-insert the disk into the PlayStation 3 Did the disk come out in the same orientation that it was inserted? No, it reads one media type, but not the other - Go to 'SOLUTION: Faulty Lens'.

Does the PlayStation read both Blu-ray disks and DVDs? No, it reads one media type, but not the other - Go to 'Step 5'.Clean the Disk - Using a cleaning solution and a microfiber cloth, clean the disc. No - Go to 'SOLUTION: Faulty Control Board'.Yes - Go to 'SOLUTION: Broken sensor board.'.Does the disk eventually get drawn into the console? - You push the disk in ~3/4 of the the way, and the mechanism draws the disk into the console

Yes - Go to 'SOLUTION: Gear Alignment Reset'.

Is the Blu-Ray Drive Blocked?- There is a physical barrier preventing your PS3 from drawing in disks Insert a disk into the PlayStation 3 Blu-ray Drive If your PlayStation 3 is not reading discs, or is reading discs inconsistently, then follow this flow chart to fully diagnose the problems with your Blu-Ray Drive. If there is no exposed control board, then the Blu-ray drive's model number is KEM-410. If the drive has an exposed control board on the bottom of the Blu-ray drive, the Blu-ray drive's model number is KEM-400. The easiest way to tell which kind of drive is in your PlayStation 3 is to take the drive out and look at it. There are two models of Blu-ray drives for the fat models of PlayStation 3, each with parts specific to their own model.

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