Lenovo N 500 Service Manual

Electrical safety 
Observe the following rules when working on electrical equipment. 
 
v   
 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. 
v 
 
 Do not work alone under hazardous conditions or near equipment that has 
hazardous voltages. 
v 
 
 Disconnect all power before: 
– 
 
 Performing a mechanical inspection 
– 
 
 Working near power supplies 
–...

v   
 Do not touch live electrical circuits with the reflective surface of a plastic dental 
mirror. The surface is conductive; such touching can cause personal injury and 
machine damage. 
v 
 
 Do not service the following parts with the power on when they are removed 
from their normal operating places in a machine: 
– 
 
 Power supply units 
– 
 
 Pumps 
– 
 
 Blowers and fans 
– 
 
 Motor generators 
– 
 
 Similar units to listed above 
This practice ensures correct grounding of the units. 
v 
 
 If...

Safety inspection guide 
The purpose of this inspection guide is to assist you in identifying potentially 
unsafe conditions. As each machine was designed and built, required safety items 
were installed to protect users and service personnel from injury. This guide 
addresses only those items. Yo u should use good judgment to identify potential 
safety hazards due to attachment of non-Lenovo 3000 features or options not 
covered by this inspection guide. 
If any unsafe conditions are present, you must...

Handling devices that are sensitive to electrostatic discharge 
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. 
 
 
When handling ESD-sensitive parts: 
v   
 Keep the parts in...

Safety notices: multilingual translations 
The safety notices in this section are provided in English, French, German, Hebrew, 
Italian, Japanese, and Spanish. 
   
 
Safety notice 1 
Before the computer is powered on after FRU replacement, make sure all screws, 
springs, and other small parts are in place and are not left loose inside the 
computer. Verify this by shaking the computer and listening for rattling sounds. 
Metallic parts or metal flakes can cause electrical shorts. 
Avant de remettre...

Safety notice 2 
DANGER   
Some standby batteries contain a small amount of nickel and cadmium. Do not 
disassemble a standby battery, recharge it, throw it into fire or water, or short-circuit it. 
Dispose of the battery as required by local ordinances or regulations. Use only the 
battery in the appropriate parts listing. Use of an incorrect battery can result in 
ignition or explosion of the battery. 
Certaines batteries de secours contiennent du nickel et du cadmium. Ne les démontez 
pas, ne les...

Safety notice 3 
DANGER   
The battery pack contains small amounts of nickel. Do not disassemble it, throw it 
into fire or water, or short-circuit it. Dispose of the battery pack as required by local 
ordinances or regulations. Use only the battery in the appropriate parts listing when 
replacing the battery pack. Use of an incorrect battery can result in ignition or 
explosion of the battery. 
La batterie contient du nickel. Ne la démontez pas, ne l’exposez ni au feu ni à l’eau. 
Ne la mettez pas en...

Safety notice 4 
DANGER   
The lithium battery can cause a fire, an explosion, or a severe burn. Do not recharge it, 
remove its polarized connector, disassemble it, heat it above 100°C (212°F), incinerate 
it, or expose its cell contents to water. Dispose of the battery as required by local 
ordinances or regulations. Use only the battery in the appropriate parts listing. Use of 
an incorrect battery can result in ignition or explosion of the battery. 
La pile de sauvegarde contient du lithium. Elle...

Safety notice 5 
If the LCD breaks and the fluid from inside the LCD gets into your eyes or on 
your hands, immediately wash the affected areas with water for at least 15 
minutes. Seek medical care if any symptoms from the fluid are present after 
washing. 
Si le panneau d’affichage à cristaux liquides se brise et que vous recevez dans les 
yeux ou sur les mains une partie du fluide, rincez-les abondamment pendant au 
moins quinze minutes. Consultez un médecin si des symptômes persistent après 
le...

Safety notice 6 
DANGER   
To avoid shock, do not remove the plastic cover that protects the lower part of the 
inverter card. 
Afin d’éviter tout risque de choc électrique, ne retirez pas le cache en plastique 
protégeant la partie inférieure de la carte d’alimentation. 
Aus Sicherheitsgründen die Kunststoffabdeckung, die den unteren Teil der 
Spannungswandlerplatine umgibt, nicht entfernen. 
 
 
Per evitare scosse elettriche, non rimuovere la copertura in plastica che avvolge la 
parte inferiore della...