Lenovo ideacentre c345, 57-311160 [9/61] Grounding requirements

Safety inspection guide

The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these

products. Each machine, as it was designed and built, had required safety items installed to protect users

and service personnel from injury. This guide addresses only those items. However, good judgment should

be used to identify potential safety hazards due to attachment of features or options not covered by this

inspection guide.

If any unsafe conditions are present, you must determine how serious the apparent hazard could be and

whether you can continue without rst correcting the problem.

Consider these conditions and the safety hazards they present:

 Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal

electrical shock).

 Explosive hazards, such as a damaged CRT face or bulging capacitor

 Mechanical hazards, such as loose or missing hardware

The guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and

the power cord disconnected.

Checklist:

1. Check exterior covers for damage (loose, broken, or sharp edges).

2. Power-off the computer. Disconnect the power cord.

3. Check the power cord for:

a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground

continuity for 0.1 ohm or less between the external ground pin and frame ground.

b. The power cord should be the appropriate type as specied in the parts listings.

c. Insulation must not be frayed or worn.

4. Remove the cover.

5. Check for any obvious alterations. Use good judgment as to the safety of any alterations.

6. Check inside the unit for any obvious unsafe conditions, such as metal lings, contamination, water or

other liquids, or signs of re or smoke damage.

7. Check for worn, frayed, or pinched cables.

8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.

Handling electrostatic discharge-sensitive devices

Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to

electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects.

Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the

person handling the part are all at the same charge.

Notes:

1. Use product-specic ESD procedures when they exceed the requirements noted here.

2. Make sure that the ESD protective devices you use have been certied (ISO 9000) as fully effective.

When handling ESD-sensitive parts:

 Keep the parts in protective packages until they are inserted into the product.

 Avoid contact with other people while handling the part.

Chapter 2. Safety information 5