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The official service manual recommends that you have certain this readjusted and calibrated after disassembly and replacement, but I didn't have any problems with mine after I put it back together.
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The calibrations are not something you can do yourself. You need special hardware and software to do it.
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See the official repair manual for more info on calibration (and any other part of the disassembly process. I included a couple links in the introduction.
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