Lenovo G50 User Guide

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

Notes:
•	Before using this information and the product it supports, be sure to read the general information under “Notices” on page 85.
•	This manual applies to the following models: Lenovo G50-70/G50-70m/Z50-70. The illustrations used in this manual are for Lenovo G50-70 unless otherwise stated.
First Edition (Dec. 2013)
© Copyright Lenovo 2013. All rights reserved.
LIMITED	AND	RESTRICTED	 RIGHTS	NOTICE:	 If	data	 or	software	 is	delivered	 pursuant	a	General	Services	 Administration	 “GSA”	contract,...

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Contents
About this manual .......................................iv
Safety information ........................................1General	safety	................................................2Electrical	safety	 ..............................................3Safety	inspection	guide	..................................5Handling	devices	that	are	sensitive	to	electrostatic	discharge	....................................6Grounding	requirements	.................................6Safety	notices:	multilingual...

iv
About this manual
This	manual	 contains	 service	and	reference	 information	 for	the	 following 	Lenovo	product:
Lenovo G50-70/G50-70m/Z50-70
Use	this	manual	to	troubleshoot	problems.
The	manual	is	divided	into	the	following	sections:
•	The	common	 sections	provide	 general	 information, 	guidelines, 	and	 safety 	information	required	for	servicing	computers.
•	The	product-specific 	section	 includes 	service, 	reference, 	and	 product-specific 	parts	information.
Important:
This manual is intended...

1
Safety information
Safety information
This	chapter	 presents	 the	following	 safety	information	 that	you	need	 to	get 	familiar	with	before	you	service	a	Lenovo	G50-70/G50-70m/Z50-70	computer:
•	“General	safety”	on	page	2
•	“Electrical	safety”	on	page	3
•	“Safety	inspection	guide”	on	page	5
•	“Handling	devices	that	are	sensitive	to	electrostatic	discharge”	on	page	6
•	“Grounding	requirements”	on	page	6
•	“Safety	notices:	multilingual	translations”	on	page	7
•	“Laser	compliance	statement”	on	page	14 

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G50-70/G50-70m/Z50-70 Hardware Maintenance Manual
General safety
Follow	these	rules	below	to	ensure	general	safety:
•	Observe	a	good	 housekeeping	 in	the	 area	 where	 the	machines	 are	put	during	and	after	the	maintenance.
•	When	lifting	any	heavy	object:	
1.	 Make	sure	that	you	can	stand	safely 	without	slipping.
2.	 Distribute	the	weight	of	the	object	equally	between	your	feet.
3.	 Use	a	slow	 lifting	 force.	 Never	 move	suddenly	 or	twist	 when	 you	attempt	to	lift	it.
4.	 Lift	 it	by	 standing...

3
Safety information
Electrical safety
Observe	the	following	rules	when	working	on	electrical	equipments.
Important:
Use only approved tools and test equipments. Some hand tools have handles 
covered with a soft material that does not insulate you when working wit\
h live 
electrical currents.
Many customers have rubber floor mats near their machines that contain small 
conductive fibers to decrease electrostatic discharges. Do not use such kind of mat 
to protect yourself from electrical shock. 
•	Find...

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G50-70/G50-70m/Z50-70 Hardware Maintenance Manual
•	Always	look	carefully	 for	possible	 hazards	in	your	 work	 area.	 Examples	 of	these	 hazards	 are	moist	 floors,	 nongrounded	 power	extension	 cables,	power	surges,	and	missing	safety	grounds.	
•	Do	not	 touch	 live	electrical	 circuits	with	the	reflective	 surface	of	a	plastic 	dental	 mirror.	 The	surface	 is	conductive;	 such	touching	 can	cause	 personal	injury	and	machine	damage.
•	Do	not	 service	 the	following	 parts	with	the	power	 on	when...

5
Safety information
Safety inspection guide
The	purpose	 of	this	 inspection	 guide	is	to	 assist	 you	in	identifying	 potential	unsafe	conditions.	 As	each	 machine	 was	designed	 and	built,	 required	 safety	items	 were	installed	 to	protect	 users	and	service	 personnel	 from	injury.	 This	guide	 addresses	 only	those	 items.	 You	should	 use	good	 judgment	 to	identify 	potential	 safety	hazards	 according	 to	the	 attachment	 of	non-Lenovo	 features	or	options	not	covered	by	this	inspection	guide....

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G50-70/G50-70m/Z50-70 Hardware Maintenance Manual
Handling devices that are sensitive to electrostatic discharge
Any	computer	 part	containing	 transistors	 or	integrated	 circuits	(ICs)	should	 be	considered	 sensitive	to	electrostatic	 discharge	(ESD).	ESD	damage	 can	occur	when 	there	 is	a	difference 	in	 charge	 between	 objects.	Protect	against	 ESD	damage	 by	equalizing	 the	charge	 so	that	 the	machine,	 the	part,	 the	work	 mat,	and	the	person	handling	the	part	are	all	at	the	same	charge....