Lenovo b50-30, 59-426189 [35/88] Screw notices

Lenovo B50-30/B50-30 Touch/B50-45/B50-70

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.

• Eachoneshouldbeusedonlyonce.

Dothefollowingwhenyouservicethismachine:

• Keepthescrewkitinyourtoolbag.

• Removescrewscarefullyforreuse.

• 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:

• Logic card to plastic

Turnanadditional180°afterthescrewheadtouchesthesurfaceofthelogic

card:

• 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firmlytothetorqueshowninthetable.Never use a screw

that you removed. Use a new one. Make sure that all screws are

tightened firmly.

• Ensuretorquescrewdriversarecalibratedcorrectlyfollowingcountry

specifications.

FRU replacement notices

more than 90°

(Cross-section)

more than 180°

(Cross-section)