Lenovo B490 Laptop Hardware Maintenance Manual - ThinkPad B490 - Page 5

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About this manual This manual provides service and reference information for the following Lenovo® products. Machine Lenovo B490, B4301, B4302, B4303, B4305, B4306, B4307, B4308, B4309, B4310, B4311, B4312, B4315, B4316, B4317, B4318, B4319, B4320, B4321, B4322, B4323, B4325, B4326, B4327, B4328, B4329, B4330, B4331, B4332, B4333, B4335, B4336, B4337, B4338, B4339, B4360, B4361, B4362, B4363, B4365, B4366, B4367, B4368, B4369, B4370, B4371, B4372, B4375, B4376, B4377, and B4378 Machine type (MT) 3756, 3772, 20205, 20207 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 only for trained service technicians who are familiar with Lenovo products. Use this manual to troubleshoot problems effectively. • Before servicing a Lenovo product, be sure to read all the information under Chapter 1 "Safety information" on page 1 and Chapter 2 "Important service information" on page 27. © Copyright Lenovo 2012, 2013 iii

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About this manual
This manual provides service and reference information for the following Lenovo
®
products.
Machine
Machine type (MT)
Lenovo B490, B4301, B4302, B4303, B4305, B4306,
B4307, B4308, B4309, B4310, B4311, B4312, B4315,
B4316, B4317, B4318, B4319, B4320, B4321, B4322,
B4323, B4325, B4326, B4327, B4328, B4329, B4330,
B4331, B4332, B4333, B4335, B4336, B4337, B4338,
B4339, B4360, B4361, B4362, B4363, B4365, B4366,
B4367, B4368, B4369, B4370, B4371, B4372, B4375,
B4376, B4377, and B4378
3756, 3772, 20205, 20207
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 only for trained service technicians who are familiar with Lenovo products. Use
this manual to troubleshoot problems effectively.
•
Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety
information” on page 1 and Chapter 2 “Important service information” on page 27.
© Copyright Lenovo 2012, 2013
iii