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Basically look at the general condition, and whether it is been constantly used. This could lead to a worn lazer. To ##### the lazer wobble the plastic moulding holding the lens, if it wobbles all over the place you could be in trouble later. Also listen to the psx when it boots a game, if you hear a warbling sound this indicates wear on the lazer. It should be quiet when reading the disks.
You ought to be quite safe with a 9002 since this was the last one made.
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