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IdeaCentr e A720
Har dwar e Maint enance Manual
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IdeaCentr e A720 Har dwar e Maint enance Manual
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Contents Chapt er 1. About this manual . . . . . . 1 Gener al information . . . . . . . . . . . . . 29 Impor tant Safety Information . . . . . . . . . . 1 Replacing the k eyboar d and mouse . . . . . . 30 Replacing the power cor d or power adapt er . . . 30 Chapt er 2. Safety information . . . . . . 3 Removing the base cover . . . . . . . . . . 31 Gener al safety . . . . . . . . . . . . . . . . 3 Replacing the har d disk drive . . . . . . . . . 32 Electrical safety . . . . . . . . . . . . . . .
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iv IdeaCentr e A720Har dwar e Maint enance Manual
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Chapt er 1. About this manual This manual contains ser vice and r efer ence information for IdeaCentr e A720 comput ers list ed on the cover . It is int ended only for tr ained ser vicers who ar e familiar with L enovo comput er pr oducts. Befor e ser vicing a L enovo pr oduct, be sur e t o r ead the Safety Information. The description of the TV -tuner car d in this manual applies only t o comput ers with a TV -tuner car d installed. It does not apply t o comput ers without a TV -tuner car d. Im
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Chapt er 2. Safety information This chapt er contains the safety information that you need t o be familiar with befor e ser vicing a comput er . Gener al safety F ollow these rules t o ensur e gener al safety: • K eep the ar eas ar ound the comput er clear and clean during and aft er maint enance. • When lifting any heav y object: 1. Ensur e you can stand safely without slipping. 2. Distribut e the weight of the object equally acr oss both feet. 3. Lift slowly . Never move suddenly or twist when
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Obser ve the following rules when working on electrical equipment. Impor tant: Use only appr oved t ools and t est equipment. Some hand t ools have handles cover ed with a soft mat erial that does not insulat e you when working with live electrical curr ents. Many cust omers have rubber floor mats near their equipment that contain small conductive fibers t o decr ease electr ostatic dischar ge. • Find the r oom emer gency power -off (EPO) switch, disconnecting switch, or electrical outlet. If an
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– Switch off power . – Send another person t o get medical aid. Safety inspection guide The int ent of this inspection guide is t o assist you in identifying pot ential hazar ds posed by these pr oducts. Each comput er , as it was designed and built, had r equir ed safety it ems installed t o pr ot ect users and ser vice personnel fr om injur y . This guide addr esses only those it ems. However , good judgment should be used t o identify pot ential safety hazar ds due t o attachment of featur es
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• K eep the par ts in pr ot ective packages until they ar e inser t ed int o the pr oduct. • A void contact with other people while handling the par t. • W ear a gr ounded wrist str ap against your skin t o eliminat e static on your body . • P r event the par t fr om t ouching your clothing. Most clothing is insulative and r etains a char ge even when you ar e wearing a wrist str ap. • Use the black side of a gr ounded work mat t o pr ovide a static-fr ee work sur face. The mat is especially use
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T o Disconnect T o Connect 1. T urn ever ything OFF . 1. T urn ever ything OFF . 2. First, attach all cables t o devices. 2. First, r emove power cor ds fr om outlets. 3. A ttach signal cables t o connect ors. 3. Remove signal cables fr om connect ors. 4. A ttach power cor ds t o outlet. 4. Remove all cables fr om devices. 5. T urn device ON. C A UTION: When r eplacing the lithium batt er y, use only P ar t Number 45C1566 or an equivalent type batt er y r ecommended by the manufactur er . If you
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≥18 kg (37 lbs) ≥32 kg (70.5 lbs) ≥55 kg (121.2 lbs) C A UTION: Use safe pr actices when lifting. C A UTION: The power contr ol butt on on the device and the power switch on the power supply do not turn off the electrical curr ent supplied t o the device. The device also might have mor e than one power cor d. T o r emove all electrical curr ent fr om the device, ensur e that all power cor ds ar e disconnect ed fr om the power sour ce. C A UTION: Do not place any object weighing mor e than 82 kg
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Chapt er 3. Gener al information This chapt er pr ovides gener al information that applies t o all comput er models cover ed by this manual. Specifications This section lists the physical specifications for your comput er . This section lists the physical specifications for your comput er . T ype IdeaCentr e A720 This section lists the physical specifications. Envir onment Air t emper atur e: Oper ating: 10° t o 35°C T r ansit: -20° t o 55°C Humidity: Oper ating: 35% t o 80% T r ansit: 20% t o 9
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Chapt er 4. Gener al Check out A tt ention: The drives in the comput er you ar e ser vicing might have been r earr anged or the drive star tup sequence may have been changed. Be e xtr emely car eful during writ e oper ations such as copying, saving, or formatting. Data or pr ogr ams can be over writt en if you select an incorr ect drive. Gener al err or messages appear if a pr oblem or conflict is found by an application, the oper ating syst em, or both. F or an e xplanation of these messages, r
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Chapt er 5. Using the Setup Utility The Setup Utility pr ogr am is used t o view and change the configur ation settings of your comput er , r egar dless of which oper ating syst em you ar e using. However , the oper ating syst em settings might override any similar settings in the Setup Utility pr ogr am. S tar ting the L enovo BIOS Setup Utility pr ogr am T o star t the L enovo BIOS Setup Utility pr ogr am, do the following: 1. If your comput er is alr eady on when you star t this pr ocedur e,
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Administr at or P asswor d Setting an Administr at or P asswor d det ers unauthoriz ed persons fr om changing configur ation settings. Y ou might want t o set an Administr at or P asswor d if you ar e r esponsible for maintaining the settings of sever al comput ers. Aft er you set an Administr at or P asswor d, a passwor d pr ompt is displayed ever y time you access the L enovo BIOS Setup Utility pr ogr am. If both the Administr at or and P ower -On P asswor d ar e set, you can type either passw
