User manual IBM THINKPAD Z61T Hardware Guide

[. . . ] ThinkPad Z61t Hardware Maintenance Manual ® October 2006 This manual supports: ThinkPad Z61t (MT 8747, 8749, 9440, 9441, 9442, 9443, and 9448) ThinkPad Z61t Hardware Maintenance Manual ® Note Before using this information and the product it supports, be sure to read the general information under "Notices" on page 160. First Edition (October 2006) © Copyright Lenovo 2006. GOVERNMENT USERS ­ RESTRICTED RIGHTS: Our products and/or services are provided with RESTRICTED RIGHTS. Use, duplication or disclosure by the Government is subject to the GSA ADP Schedule contract with Lenovo Group Limited, if any, or the standard terms of this commercial license, or if the agency is unable to accept this Program under these terms, then we provide this Program under the provisions set forth in Commercial Computer Software­Restricted Rights at FAR 52. 227-19, when applicable, or under Rights in Data-General, FAR 52. 227. 14 (Alternate III). Contents About this manual . 3 Strategy for replacing a hard disk drive . [. . . ] Note: Noise from the ac adapter does not always indicate a defect. Checking operational charging To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. If the charge indicator or icon still does not turn on, replace the battery pack. If the charge indicator still does not turn on, replace the system board. If it is still not charged, go to the next section. Checking the battery pack Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life. To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon. General descriptions 31 Checkout guide Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it. To check the battery pack, do the following: 1. Remove the battery pack and measure the voltage between battery terminals 1, 2 (-) and 6, 7 (+). See the following figure: Terminal Voltage (V dc) Ground (-) + 0 to + 16. 8 7(+) 6(+) 5 4 3 1(-) 2(-) 1, 2 6, 7 3. If the voltage is less than +11. 0 V dc, the battery pack has been discharged. Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11. 0 V dc after recharging, replace the battery. If the voltage is more than +11. 0 V dc, measure the resistance between battery terminals 3 and 2. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. Checking the backup battery Do the following: 1. Power off the computer, and unplug the ac adapter from it. Remove the battery pack (see "1010 Battery pack" on page 56). Remove the backup battery (see "1110 Backup battery" on page 76). [. . . ] The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to: Lenovo (United States), Inc. 54 Research Triangle Park, NC 27709 U. S. A. Attention: Lenovo Director of Licensing LENOVO GROUP LTD. [. . . ]