Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components.

CAUTION:

The heat sink and microprocessor might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover.

To replace the power supply assembly, do the following:

1.Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

2.Remove any locking device that secures the computer cover, such as a padlock or an integrated cable lock.

3.Remove the computer cover. See “Removing the computer cover” on page 64.

4.Place the computer on its side to gain easier access to the power supply.

5.Disconnect the power supply assembly cables from the system board and the drives. In some models, you might need to disconnect the power supply assembly cables from the Peripheral Component Interconnect (PCI) cards.

6.Remove the six screws that secure the power supply as shown in the following illustration.

Figure 55. Removing six screws that secure the power supply assembly

7.Slide the power supply assembly toward the front of the computer and then lift it out of the chassis.

8.Install the new power supply assembly into the chassis, and make sure the screw holes in the new power supply assembly align with those in the chassis.

9.Install the six screws that secure the new power supply assembly in place.

10.Connect the power supply assembly cables to the system board and all drives. In some models, you might need to connect the power supply assembly cables to the PCI cards.

11.Return the computer to its original position.

Chapter 10. Replacing FRUs 103

Page 109
Image 109
Lenovo 4228, 4223, 4229 manual Removing six screws that secure the power supply assembly

4229, 4223, 4228 specifications

Lenovo has long been recognized for its commitment to producing high-quality computing solutions, and the ThinkPad line is no exception. Among its various models, the Lenovo ThinkPad series 4228, 4223, and 4229 stand out for their robust features and reliable performance, making them ideal choices for business and professional use.

The Lenovo ThinkPad 4228 series is engineered with a focus on durability and performance. One of its key features is the powerful Intel Core processor range, which ensures that users can manage demanding applications and multitask efficiently. Alongside this, the device typically comes equipped with ample RAM, providing speed and responsiveness that enhances productivity.

Moving to the ThinkPad 4223, it streamlines user experience with advanced connectivity options. The inclusion of multiple USB ports, HDMI, and Ethernet capabilities allows for seamless integration with various devices and networks. The 4223 model often houses a backlit keyboard, enabling users to work effortlessly in low-light environments. This model puts a strong emphasis on portability, making it a reliable companion for professionals on the move.

The ThinkPad 4229 takes connectivity a step further by offering options like Wi-Fi 6 and Bluetooth, ensuring fast and stable connections whether in the office or on the go. This model is often equipped with a higher resolution display, contributing to a better viewing experience for video conferencing and presentations. Its extended battery life is a notable feature, allowing users to remain productive without the constant need for recharging.

All three models in the 422x series boast Lenovo’s robust security features, including fingerprint readers and TPM (Trusted Platform Module), which safeguard sensitive data against unauthorized access. Furthermore, the reputation of Lenovo ThinkPads for their exceptional keyboard layout ensures that users can type comfortably over extended periods, reducing strain and increasing efficiency.

In summary, the Lenovo ThinkPad 4228, 4223, and 4229 models represent a blend of power, durability, and user-friendly design. With their focus on connectivity, performance, and security, these laptops cater perfectly to the needs of professionals and businesses, confirming Lenovo's status as a leading manufacturer in the world of computing technology. Whether you need a rugged workhorse for heavy tasks or a portable device for meetings, the ThinkPad series provides versatile solutions to meet any requirement.