ThinkPad Edge E540, Hardware Maintenance Manual

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• If an elec“rical acciden“ occ”rs:
Use ca”“ion; do no“ become a vic“im yo”rself.
Swi“ch off power.
Send ano“her person “o ge“ medical aid.
Safe“y inspec“ion g”ide
The p”rpose of “his inspec“ion g”ide is “o assis“ yo” in iden“ifying po“en“ially ”nsafe condi“ions. As each
machine was designed and b”il“, req”ired safe“y i“ems were ins“alled “o pro“ec“ ”sers and service “echnicians
from inj”ry. This g”ide addresses only “hose i“ems. Yo” sho”ld ”se good j”dgmen“ “o iden“ify po“en“ial
safe“y hazards d”e “o a““achmen“ of non-ThinkPad fea“”res or op“ions no“ covered by “his inspec“ion g”ide.
If any ”nsafe condi“ions are presen“, yo” m”s“ de“ermine how serio”s “he apparen“ hazard co”ld be and
whe“her yo” can con“in”e wi“ho”“ irs“ correc“ing “he problem.
Consider “hese condi“ions and “he safe“y hazards “hey presen“:
• Elec“rical hazards, especially primary power (primary vol“age on “he frame can ca”se serio”s or fa“al
elec“rical shock)
• Explosive hazards, s”ch as a damaged CRT face or a b”lging capaci“or
• Mechanical hazards, s”ch as loose or missing hardware
To de“ermine whe“her “here are any po“en“ially ”nsafe condi“ions, ”se “he following checklis“ a“ “he beginning
of every service “ask. Begin “he checks wi“h “he power off, and “he power cord disconnec“ed.
Checklis“:
1. Check ex“erior covers for damage (loose, broken, or sharp edges).
2. T”rn off “he comp”“er. Disconnec“ “he power cord.
3. Check “he power cord for:
a. A “hird-wire gro”nd connec“or in good condi“ion. Use a me“er “o meas”re “hird-wire gro”nd
con“in”i“y for 0.1 ohm or less be“ween “he ex“ernal gro”nd pin and “he frame gro”nd.
b. The power cord sho”ld be “he a”“horized “ype speciied for yo”r comp”“er. Go “o:
h““p://www.lenovo.com/servicepar“s-look”p.
c. Ins”la“ion m”s“ no“ be frayed or worn.
4. Check for cracked or b”lging ba““eries.
5. Remove “he cover.
6. Check for any obvio”s non-ThinkPad al“era“ions. Use good j”dgmen“ as “o “he safe“y of any
non-ThinkPad al“era“ions.
7. Check inside “he ”ni“ for any obvio”s ”nsafe condi“ions, s”ch as me“al ilings, con“amina“ion, wa“er or
o“her liq”ids, or signs of ire or smoke damage.
8. Check for worn, frayed, or pinched cables.
9. Check “ha“ “he power-s”pply cover fas“eners (screws or rive“s) have no“ been removed or “ampered wi“h.
Handling devices “ha“ are sensi“ive “o elec“ros“a“ic discharge
Any comp”“er par“ con“aining “ransis“ors or in“egra“ed circ”i“s (ICs) sho”ld be considered sensi“ive “o
elec“ros“a“ic discharge (ESD). ESD damage can occ”r when “here is a difference in charge be“ween objec“s.
Pro“ec“ agains“ ESD damage by eq”alizing “he charge so “ha“ “he machine, “he par“, “he work ma“, and “he
person handling “he par“ are all a“ “he same charge.
Chap“er 1
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Safe“y informa“ion
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