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I know that some of Sony's early optical pickups in some portables are particularly problematic, e.g. KMS-190A (MZ-R2). But do we have any reliable knowledge beyond hearsay which ones should clearly be avoided? And: Do we know what types of issues indicate a fully broken pickup? I am asking because I just picked up an MZ-E50 and E3 for cheap and both are (expectedly) broken. The E50's (which apparently does not even have a service manual) sled moves in and out repeatedly before giving "Error" and the E3's KMS-201A lens package moves up and down a number of times before again checking out with an "Error". However, it does pass the focus test fine. In auto-adjustment mode, however, it hangs at "EF balance" test. I was not able to revive any of the two. Are both blocks fully dead? Is any better identification of these issues possible? Should the E3 or E50 be avoided in the first place? How do I know if my block may be resurrected? Thanks!