Lenovo ThinkPad T420 Support Question
Lenovo ThinkPad T420 Support Question
Find answers below for this question about Lenovo ThinkPad T420.Need a Lenovo ThinkPad T420 manual? We have 38 online manuals for this item!
Question posted by ingwstusa on August 2nd, 2014
Thinkpad T420 Cannot Unmute
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Related Lenovo ThinkPad T420 Manual Pages
ThinkPad Gobi Mobile Broadband Wireless WAN (L420, L421, L520, T420s, T420si, T430s, T430si) - Page 2
ThinkPad® Mobile Broadband (T420s, T420si, T430s, and T430si)
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http://www.lenovo.com/support/wireless
© Lenovo 2012. ThinkPad is a registered trademark of Lenovo.
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ThinkPad Gobi Mobile Broadband Wireless WAN (T420, T420i, T430, T430i, T520, T520i, T530, T530i, W520, W530) - Page 1
ThinkPad® Mobile Broadband (T420, T420i, T430, and T430i)
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MAIN(Red)
AUX(Blue)
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http://www.lenovo.com/support/wireless
(English) BIOS Setup using Windows Management Instrumentation Deployment Guide - Page 10
... Common interface for different products
Supported computers
BIOS setup through WMI is supported on the following ThinkPad products only: • R400, R500, T400, T500, W500, X200, X200s, X200 ...8226; W700, W700ds, W701 • T400s • X201, X201s, T410, T410s, T510, W510 • T420, T420i, T420s, T420si, T520, T520i, W520, X220, X220i, X220 Tablet, X220i Tablet • X1 • T430,...
Hardware Maintenance Manual - Page 1
ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 3
... supporting the Lenovo ThinkVantage Toolbox program and the PC-Doctor for CTO, CMV, and GAV products 25
Chapter 3. Removing and replacing a FRU 65
Before servicing ThinkPad T420 and T420i . . . 66 1010 Battery pack 67 1020 ExpressCard blank bezel 68 1030 Serial Ultrabay Enhanced device or travel bezel 69 1040 Hard disk drive...
Hardware Maintenance Manual - Page 4
Notices 175
Electronic emissions notices 176 Trademarks 177
ii ThinkPad T420 and T420i Hardware Maintenance Manual 1150 Speaker assembly 95 1160 LCD unit 97 1170 Fan assembly 101 1180 CPU 105 1190 Base cover assembly and ...
Hardware Maintenance Manual - Page 5
... this manual along with the advanced diagnostic tests to troubleshoot problems.
Important: This manual is intended only for the following ThinkPad® products. Before servicing a ThinkPad product, be sure to troubleshoot problems effectively. ThinkPad T420 and T420i Machine Type 4177, 4178, 4179, 4180, 4236, 4237, and 4238
Use this manual along with the advanced...
Hardware Maintenance Manual - Page 6
iv ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 8
... near power supplies - First, check that it , ask the customer to protect yourself from a circuit. Examples of the units.
• If an electrical accident occurs:
2 ThinkPad T420 and T420i Hardware Maintenance Manual Attention: Another person must be there to switch off .
• Always look carefully for possible hazards in the safety sections...
Hardware Maintenance Manual - Page 10
Most clothing is required for operator safety and correct system function. You can be verified by a certified electrician.
4 ThinkPad T420 and T420i Hardware Maintenance Manual
Attach the ESD ground clip to provide a static-free work surface. Grounding requirements
Electrical grounding of the computer is insulative ...
Hardware Maintenance Manual - Page 12
... from the fluid are present after washing. Seek medical care if any symptoms from electrical outlets, remove the battery pack, and disconnect any interconnecting cables.
6 ThinkPad T420 and T420i Hardware Maintenance Manual DANGER If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands...
Hardware Maintenance Manual - Page 20
14 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 24
18 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 26
20 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 28
22 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual - Page 30
...: The drive startup sequence in the computer you are servicing may have been changed . If your computer is installed on a system board are servicing.
24 ThinkPad T420 and T420i Hardware Maintenance Manual Always try to prevent cracking at each BGA (Ball Grid Array) chipset. Attention: The drive startup sequence in the wireless...
Hardware Maintenance Manual - Page 32
... FRUs, do the following :
1. Click Check Warranty Status. 3. Click the Parts Detail tab to view the list of FRUs at the MT Model level.
26 ThinkPad T420 and T420i Hardware Maintenance Manual hard disk drive, system board, microprocessor, LCD, and memory) Use the HMM as a back-up to PEW and eSupport to...
Hardware Maintenance Manual - Page 34
...by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products
The following symptoms might indicate damage caused by the customer. What to do first
When ... parts return form that the system was subjected to excessive force,
or dropped.
28 ThinkPad T420 and T420i Hardware Maintenance Manual Customer's name and address
Note: During the warranty period,...
Hardware Maintenance Manual - Page 36
... not only with the arrow keys, but also with the arrow keys, and press Enter. otherwise, it cannot be sensed.
30 ThinkPad T420 and T420i Hardware Maintenance Manual When the ThinkPad logo comes up, immediately press F12 to enter the Boot Menu. 5. Diagnostics
Interactive Tests
Run Normal Test Run Quick Test CPU/Coprocessor...
Hardware Maintenance Manual - Page 60
... computer into sleep (standby) mode or turn off the computer. Sudden physical shock could cause drive errors.
54 ThinkPad T420 and T420i Hardware Maintenance Manual 5 6
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Table 7. None of the recording devices is available while the microphone...is on mute. To set the speakers on mute or unmute, press the speaker mute button.
2
Microphone mute
Orange:
The microphone is ready for use .
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