Lenovo Z50-70 Specifications download pdf (Page 34)

G50-70/G50-70m/Z50-70 Hardware Maintenance Manual

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.

• Eachoneshouldbeusedonlyonce.

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.

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Lenovo Z50-70 Specifications Page 34