Power system checkout

To verify a symptom, do the following:

1.Turn off the computer.

2.Remove the battery pack.

3.Connect the ac adapter.

4.Check that power is supplied when you turn on the computer.

5.Turn off the computer.

6.Disconnect the ac adapter and install the charged battery pack.

7.Check that the battery pack supplies power when you turn on the computer.

If you suspect a power problem, see the appropriate one of the following power supply checkouts:

v“Checking the AC adapter”

v“Checking operational charging” on page 31

v“Checking the battery pack” on page 31

v“Checking the backup battery” on page 32

Checking the AC adapter

You are here because the computer fails only when the AC adapter is used.

vIf the power problem occurs only when the ThinkPad Essential Port Replicator is used, replace the port replicator.

vIf the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation.

vIf the computer does not charge during operation, go to “Checking operational charging” on page 31

To check the AC adapter, do the following:

1.Unplug the AC adapter cable from the computer.

2.Measure the output voltage at the plug of the AC adapter cable. See the following figure:

3

2

1

(20V)

Pin

Voltage (V dc)

1+20

20

3Ground

Note: Output voltage of pin no.2 of the AC adapter may different from the one you are servicing.

3.If the voltage is not correct, replace the AC adapter.

4.If the voltage is acceptable, do the following: v Replace the system board.

vIf the problem persists, go to “ThinkPad T61 and T61p (14.1-inch)” on page 47.

Note: Noise from the AC adapter does not always indicate a defect.

30ThinkPad T61 and T61p (14.1-inch) Hardware Maintenance Manual

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Lenovo T61p manual Power system checkout, Checking the AC adapter, Pin Voltage V dc
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T61, T61p specifications

The Lenovo T61, part of the ThinkPad series, is a notable business laptop that has garnered attention due to its durability, performance, and timeless design. Released in the mid-2000s, the T61 was engineered for professionals who require reliability and functionality on the go.

Key features of the T61 include its robust construction, conforming to military specifications for durability. This makes it resistant to extreme temperatures and shocks, ensuring it can withstand the rigors of everyday business travel. The laptop sports a classic black chassis with the signature ThinkPad styling, including the iconic red TrackPoint, which allows for precise navigation without having to use the touchpad.

In terms of performance, the T61 is equipped with Intel Core 2 Duo processors, offering solid processing power for multitasking and demanding applications. Users can choose from various configurations, with options for up to 4GB of RAM and multiple hard drive capacities, providing flexibility based on individual needs. The inclusion of Intel Graphics Media Accelerator or optional NVIDIA graphics offers decent visual performance, catering to both work and casual multimedia use.

Display options on the T61 are varied, featuring a 14.1 or 15.4-inch screen with a resolution of up to 1680x1050 pixels. Some models support a matte finish that reduces glare, enhancing usability in bright environments – a thoughtful design feature for professionals constantly on the move.

For connectivity, the T61 integrates various ports, including USB 2.0, Ethernet, and modem connections, along with options for Wi-Fi and Bluetooth. This ensures that users can stay connected seamlessly, whether in the office or on the road. Additionally, the laptop supports docking stations, allowing for a more efficient workspace setup by easily connecting multiple peripherals.

Battery life is another notable characteristic of the T61, with options for extended batteries that can provide hours of usage without needing to recharge. This mobility factor is essential for professionals who may be away from power outlets for extended periods.

Security features on the T61 include biometric fingerprint readers and optional TPM (Trusted Platform Module) functionality, emphasizing Lenovo's commitment to data security for business users.

Overall, the Lenovo T61 stands as a testament to Lenovo's dedication to creating reliable and efficient laptops tailored for professionals, balancing performance with practicality and durability. Its features and build quality have left a lasting impression, securing its place as a cherished classic in the realm of business laptops.
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