Hardware Maintenance Manual - Lenovo Y40 50 Series

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Lenovo Y40-70/Y40-80/Y50-70/Y50-80/Y50-70 Touch/ Y50-80 Touch
FRU replacement notices
Thissection presentsnoticesrelatedtoremoving andreplacingparts. Read
thissectioncarefullybeforereplacinganyFRU.
Screw notices
Loosescrewscancause areliability problem.IntheLenovocomputer,this
problemisaddressedwithspecialnylon-coatedscrewsthathavethefollowing
characteristics:
•
Theymaintaintightconnections.
• Theydonoteasilycomeloose,evenwithshockorvibration.
• Theyarehardertotighten.
Dothefollowingwhenyouservicethismachine:
• Keepthescrewkitinyourtoolbag.
• CarefullyremovescrewsforreusewhenreplacingFRUs.
• Useatorquescrewdriverifyouhaveone.
Tightenscrewsasfollows:
• Plastic to plastic
 Turn anadditional 90°after thescrew headtouchesthesurfaceofthe
plasticpart:
more than 90°
(Cross-section)
• Logic card to plastic
 Turnanadditional 180°after thescrewheadtouchesthesurfaceofthe
logiccard:
more than 180°
(Cross-section)
• Torque driver
 Ifyouhaveatorquescrewdriver,refertothe“Torque”columnforeachstep.
• Makesurethatyouusethecorrectscrews.Ifyouhaveatorquescrewdriver,
tightenallscrewsrmlytothetorqueshowninthetable.
Carefully remove
screws for reuse when replacing FRUs. Make sure that all screws are
tightened rmly.
•
Ensuretorque screwdriversarecalibratedcorrectlyfollowing country
specications.