VP415
Diagnostics



Several hours, or possibly even days, later, and we can see a large pile of modules on the right of the picture, which have been taken out of the faulty VP415 and replaced with the equivalent from the VP410.

I have to admit, I wasn't expecting to be able to get the thing going, so I was most definitely surprised and very happy when eventually I did get the disc to play, as you can see in the picture here. The player is in diagnostic check mode, and apparently all the numbers on the screen apart from bottom right don't mean anything. The last error is 81, meaning "No 24 bits". I don't know what that means either, thought it's possible it might relate to the way LV-ROM data is encoded on the discs, so it could just be telling me that this isn't a LV-ROM disc we're trying to play.

It appears that I wasn't quite as methodical as I'd thought, as my notes indicate that by this point I had swapped modules R & S and A to L, thus discovering that module L was faulty. That seems to indicate that I must have changed R and S first, probably because they are down the side of the power supply and so are accessible without having to dismantle the drive tray. I don't mind telling you that it was a total pain taking off the whole disc tray assembly, changing a module, and putting it back on again, including re-connecting the earth wire every time, which you can just see at the back of the VP415 on the right-hand side!



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