Swapping the optical-drive assembly over is pretty easy on these little fellas, but this replacement came with some extra issues. Because apparently replacing a PlayStation laser is never quite as straightforward as I’d like!

This time I’m working on a Sony PS one SCPH-102. Rather than replacing the entire mechanism, I’m transferring the laser assembly between two drives. That means dealing with the guide rail, gears and little plastic pieces that hold everything in place.

Getting the old laser out wasn’t too difficult once I’d worked out which way the mechanism needed to slide. Putting the replacement back in, however, was another matter entirely. There were a few interesting noises as the gears complained about being moved around!

There’s a little white plastic guide piece that needs to come away before the optical pickup can be removed. It looks straightforward enough until you actually try moving it. I spent an impressive amount of time pushing the assembly backwards and forwards, getting increasingly covered in grease, before finally working out how the thing was meant to lift out.

Reinstalling it was even more entertaining. Everything needs to line up with the metal guide and the plastic gears, and the mechanism has a wonderful tendency to move just as you’re trying to put the final piece in position. “Simply pop it down,” I said. Yes, simply. What could possibly go wrong?

After reassembling everything, I gave the console a test. Unfortunately, the disc wasn’t spinning particularly happily, and the laser carriage wasn’t moving as freely as expected. At one point the flex cable was actually pushing part of the mechanism upwards. That’s hardly going to help when you’re trying to read a disc!

I eventually discovered that some of the plastic guide components were slightly different between the two assemblies. Swapping and repositioning those parts made a considerable difference, and the mechanism started moving much more freely.

There was also another complication involving the console itself. This was a machine I’d previously removed a damaged modchip from, so some of its behaviour wasn’t necessarily caused by the replacement laser. Better not blame the optical pickup for everything!

After a little more fiddling with the spindle hub and mechanism, I finally managed to get a game running. Final Fantasy VIII appeared on the screen, complete with its full-motion video. Much more like it!

That doesn’t mean everything was suddenly perfect, of course. I’d already encountered problems with replacement spindle hubs sitting at the wrong height or coming loose, and this experiment certainly didn’t make me any more confident in some of those inexpensive replacement parts. Some of the laser assemblies I’d received were corroded as well, which didn’t exactly inspire confidence.

Sony also used several KSM-440 optical-drive variants across the PlayStation family. The PS one commonly uses the KSM-440BAM, so it’s important to check the actual mechanism, cable and mechanical fit rather than assuming every PlayStation laser is interchangeable.

Some of the replacement mechanisms I’d seen had particularly troublesome spindle hubs. The centre piece wasn’t always sitting at the correct height, and a few of the little plastic retaining tabs looked rather fragile. I would much rather reuse a good original hub than discover that the replacement has decided to come apart with the disc.

By the end, the PlayStation was considerably happier and actually loading a game. Another rather entertaining repair adventure, and another reminder that sometimes the little mechanical details cause more trouble than the electronics themselves.

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