Observe the following rules when working on electrical equipment.

Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have rubber floor mats near their equipment that contain small conductive fibers to decrease electrostatic discharge.

•Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly.

•Do not work alone under hazardous conditions or near equipment that has hazardous voltages.

•Disconnect all power before:

–Performing a mechanical inspection

–Working near power supplies

–Removing or installing Field Replaceable Units (FRUs)

•Before you start to work on the computer, unplug the power cord. If you cannot unplug it, ask the customer to power-off the electrical outlet that supplies power to the machine and to lock the electrical outlet in the off position.

•If you need to work on a computer that has exposed electrical circuits, observe the following precautions:

–Ensure that another person, familiar with the power-off controls, is near you. Remember: Another person must be there to switch off the power, if necessary.

–Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back.

Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current from passing through your body.

–When using a tester, set the controls correctly and use the approved probe leads and accessories for that tester.

–Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of the maintenance information. Use extreme care when measuring high voltages.

•Regularly inspect and maintain your electrical hand tools to ensure they are safe to use.

•Do not use worn or broken tools and testers.

•Never assume that power has been disconnected from a circuit. First, check that it has been powered off.

•Always look carefully for possible hazards in your work area. Examples of these hazards are wet floors, non-grounded power extension cables, conditions that may cause or allow power surges, and missing safety grounds.

•Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. This surface is conductive, and touching a live circuit can cause personal injury and damage to the computer.

•Do not service the following parts with the power on when they are removed from their normal operating positions in a computer:

–Power supply units

–Pumps

–Blowers and fans

–Motor generators

and similar units. (This practice ensures correct grounding of the units.)

•If an electrical accident occurs:

– Use caution; do not become a victim yourself.

4IdeaCentre A720Hardware Maintenance Manual

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A720 specifications

The Lenovo A720 stands out as a versatile and stylish all-in-one PC that caters to both home entertainment and productivity needs. Launched as part of Lenovo's A-series lineup, it combines powerful performance with an elegant design, making it an appealing choice for users seeking a comprehensive computing solution.

One of the key features of the Lenovo A720 is its stunning 27-inch display, which boasts a Full HD resolution of 1920 x 1080 pixels. This high-quality display delivers crisp images and vibrant colors, enhancing the overall viewing experience for movies, games, and graphic design tasks. The A720 also comes equipped with multi-touch technology, allowing users to interact with the screen intuitively, facilitating seamless navigation and control.

Under the hood, the Lenovo A720 is powered by Intel's third-generation Core processors, which provide robust performance for multitasking and demanding applications. Depending on the configuration, users can choose between various processor options, including Core i5 and i7, ensuring that they have sufficient processing power for their specific requirements. Coupled with up to 16GB of RAM, the A720 can handle multiple applications running simultaneously, making it an excellent choice for multitaskers.

The A720's storage options include a hybrid of traditional hard drives and solid-state drives, allowing for both capacity and speed. With up to 1TB of storage space available, users can store their files, media, and applications without worrying about running out of space. The integration of SSD technology enhances boot and load times, ensuring a snappy user experience.

For connectivity, the Lenovo A720 offers a wide array of ports, including USB 3.0, HDMI, and audio jacks, making it easy to connect peripherals and external devices. Additionally, it features integrated Wi-Fi and Bluetooth capabilities, enabling seamless wireless connectivity for internet access and file sharing.

Another notable aspect of the Lenovo A720 is its sleek aesthetic, featuring a thin profile and a stand that allows for adjustment of the screen angle. This design not only enhances the aesthetic appeal of the device but also provides ergonomic benefits for prolonged usage.

In conclusion, the Lenovo A720 is a well-rounded all-in-one PC that combines impressive display quality, powerful performance, and modern connectivity options. Its multi-touch screen, strong processing capabilities, and stylish design make it a great choice for both casual users and professionals looking for a comprehensive solution for work and entertainment. Whether for watching movies, playing games, or executing productivity tasks, the Lenovo A720 delivers an exceptional experience.
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