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 
– 
 
 Removing or installing main units
v
   
 Before you start to work on the machine, unplug the power cord. If you cannot 
unplug it, ask the customer to power-off the wall box that supplies power to the 
machine, and to lock the wall box in the off position. 
v 
 
 If you need to work on a machine that has exposed electrical circuits, observe the 
following precautions: 
– 
 
 Ensure that another person, familiar with the power-off controls, is near you. 
 
Attention:   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. 
 
Attention:   An electrical shock can occur only when there is a complete 
circuit. By observing the above rule, you may prevent a current from passing 
through your body. 
– 
 
 When using testers, 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; 
Instructions for these precautions are in the safety sections of maintenance 
information. Use extreme care when measuring high voltages. 
v   
 Regularly inspect and maintain your electrical hand tools for safe operational 
condition. 
v 
 
 Do not use worn or broken tools and testers. 
v 
 
 Never assume that power has been disconnected from a circuit. First, check that it 
has been powered off. 
v 
 
 Always look carefully for possible hazards in your work area. Examples of these 
hazards are moist floors, nongrounded power extension cables, power surges, 
and missing safety grounds.   
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, near their equipment, rubber floor mats that contain small 
conductive fibers to decrease electrostatic discharges. Do not use this type of mat 
to protect yourself from electrical shock. 
 
Safety information 3 
						

							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 an electrical accident occurs: 
– 
 
 Use caution; do not become a victim yourself. 
– 
 
 Switch off power. 
– 
 
 Send another person to get medical aid.
 
 
4 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							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 determine how serious the apparent 
hazard could be and whether you can continue without first correcting the 
problem. 
Consider these conditions and the safety hazards they present: 
v   
 Electrical hazards, especially primary power (primary voltage on the frame can 
cause serious or fatal electrical shock) 
v 
 
 Explosive hazards, such as a damaged CRT face or a bulging capacitor 
v 
 
 Mechanical hazards, such as loose or missing hardware
To
 determine whether there are any potentially unsafe conditions, use the 
following checklist at the beginning of every service task. 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 the frame ground. 
b. 
 
 The power cord should be the type specified in the parts list. 
c. 
 
 Insulation must not be frayed or worn.
4.
   
 Check for cracked or bulging batteries. 
5. 
 
 Remove the cover. 
6. 
 
 Check for any obvious non-Lenovo 3000 alterations. Use good judgment as to 
the safety of any non-Lenovo 3000 alterations. 
7. 
 
 Check inside the unit for any obvious unsafe conditions, such as metal filings, 
contamination, water or other liquids, or signs of fire or smoke damage. 
8. 
 
 Check for worn, frayed, or pinched cables. 
9. 
 
 Check that the power-supply cover fasteners (screws or rivets) have not been 
removed or tampered with.
 
 
Safety information 5 
						

							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 protective packages until they are inserted into the product. 
v 
 
 Avoid contact with other people. 
v 
 
 Wear a grounded wrist strap against your skin to eliminate static on your body. 
v 
 
 Prevent the part from touching your clothing. Most clothing is insulative and 
retains a charge even when you are wearing a wrist strap. 
v 
 
 Use a grounded work mat to provide a static-free work surface. The mat is 
especially useful when handling ESD-sensitive devices. 
v 
 
 Select a grounding system, such as those listed below, to provide protection that 
meets the specific service requirement. 
 
–   
 Attach the ESD ground clip to any frame ground, ground braid, or green-wire 
ground. 
– 
 
 When working on a double-insulated or battery-operated system, use an ESD 
common ground or reference point. Yo u can use coax or connector-outside 
shells on these systems. 
– 
 
 Use the round ground prong of the ac plug on ac-operated computers.
Grounding requirements 
Electrical grounding of the computer is required for operator safety and correct 
system function. Proper grounding of the electrical outlet can be verified by a 
certified electrician.   
Notes: 
1.   
 Use product-specific ESD procedures when they exceed the requirements 
noted here. 
2. 
 
 Make sure that the ESD protective devices you use have been certified (ISO 
9000) as fully effective.
 
Note:
The
 use of a grounding system to guard against ESD damage is desirable but not 
necessary. 
 
6 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							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 l’ordinateur sous tension après remplacement d’une unité en 
clientèle, vérifiez que tous les ressorts, vis et autres pièces sont bien en place et 
bien fixées. Pour ce faire, secouez l’unité et assurez-vous qu’aucun bruit suspect 
ne se produit. Des pièces métalliques ou des copeaux de métal pourraient causer 
un court-circuit. 
Bevor nach einem FRU-Austausch der Computer wieder angeschlossen wird, 
muß sichergestellt werden, daß keine Schrauben, Federn oder andere Kleinteile 
fehlen oder im Gehäuse vergessen wurden. Der Computer muß geschüttelt und 
auf Klappergeräusche geprüft werden. Metallteile oder-splitter können 
Kurzschlüsse erzeugen. 
   
Prima di accendere l’elaboratore dopo che é stata effettuata la sostituzione di una FRU, 
accertarsi che tutte le viti, le molle e tutte le altri parti di piccole dimensioni siano nella 
corretta posizione e non siano sparse all’interno dell’elaboratore. Verificare ciò scuotendo 
l’elaboratore e prestando attenzione ad eventuali rumori; eventuali parti o pezzetti 
metallici possono provocare cortocircuiti pericolosi. 
 
 
Antes de encender el sistema despues de sustituir una FRU, compruebe que todos los 
tornillos, muelles y demás piezas pequeñas se encuentran en su sitio y no se encuentran 
sueltas dentro del sistema. Compruébelo agitando el sistema y escuchando los posibles 
ruidos que provocarían. Las piezas metálicas pueden causar cortocircuitos eléctricos. 
 
Safety information 7 
						

							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 rechargez pas, ne les exposez ni au feu ni à l’eau. Ne les mettez pas en 
court-circuit. Pour les mettre au rebut, conformez-vous à la réglementation en vigueur. 
Lorsque vous remplacez la pile de sauvegarde ou celle de l’horloge temps réel, veillez 
à n’utiliser que les modèles cités dans la liste de pièces détachées adéquate. Une 
batterie ou une pile inappropriée risque de prendre feu ou d’exploser. 
Die Bereitschaftsbatterie, die sich unter dem Diskettenlaufwerk befindet, kann 
geringe Mengen Nickel und Cadmium enthalten. Sie darf nur durch die Verkaufsstelle 
oder den IBM Kundendienst ausgetauscht werden. Sie darf nicht zerlegt, 
wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Die 
Batterie kann schwere Verbrennungen oder Verätzungen verursachen. Bei der 
Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der 
Bereitschafts-oder Systembatterie nur Batterien des Typs verwenden, der in der 
Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu Entzündung oder 
Explosion führen. 
 
 
Alcune batterie di riserva contengono una piccola quantità di nichel e cadmio. Non 
smontarle, ricaricarle, gettarle nel fuoco o nell’acqua né cortocircuitarle. Smaltirle 
secondo la normativa in vigore (DPR 915/82, successive disposizioni e disposizioni 
locali). Quando si sostituisce la batteria dell’RTC (real time clock) o la batteria di 
supporto, utilizzare soltanto i tipi inseriti nell’appropriato Catalogo parti. L’impiego di 
una batteria non adatta potrebbe determinare l’incendio o l’esplosione della batteria 
stessa. 
 
 
Algunas baterías de reserva contienen una pequeña cantidad de níquel y cadmio. No 
las desmonte, ni recargue, ni las eche al fuego o al agua ni las cortocircuite. 
Deséchelas tal como dispone la normativa local. Utilice sólo baterías que se 
encuentren en la lista de piezas. La utilización de una batería no apropiada puede 
provocar la ignición o explosión de la misma. 
 
8 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							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 court-circuit. Pour la mettre au rebut, conformez-vous à la 
réglementation en vigueur. Lorsque vous remplacez la batterie, veillez à n’utiliser que 
les modèles cités dans la liste de pièces détachées adéquate. En effet, une batterie 
inappropriée risque de prendre feu ou d’exploser. 
Akkus enthalten geringe Mengen von Nickel. Sie dürfen nicht zerlegt, 
wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt werden. Bei 
der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen 
der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist. 
Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen. 
 
 
La batteria contiene piccole quantità di nichel. Non smontarla, gettarla nel fuoco o 
nell’acqua né cortocircuitarla. Smaltirla secondo la normativa in vigore (DPR 915/82, 
successive disposizioni e disposizioni locali). Quando si sostituisce la batteria, 
utilizzare soltanto i tipi inseriti nell’appropriato Catalogo parti. L’impiego di una 
batteria non adatta potrebbe determinare l’incendio o l’esplosione della batteria stessa. 
 
 
Las baterías contienen pequeñas cantidades de níquel. No las desmonte, ni recargue, 
ni las eche al fuego o al agua ni las cortocircuite. Deséchelas tal como dispone la 
normativa local. Utilice sólo baterías que se encuentren en la lista de piezas al 
sustituir la batería. La utilización de una batería no apropiada puede provocar la 
ignición o explosión de la misma. 
 
Safety information 9 
						

							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 présente des risques d’incendie, 
d’explosion ou de brûlures graves. Ne la rechargez pas, ne retirez pas son connecteur 
polarisé et ne la démontez pas. Ne l’exposez pas à une temperature supérieure à 100°C, 
ne la faites pas brûler et n’en exposez pas le contenu à l’eau. Mettez la pile au rebut 
conformément à la réglementation en vigueur. Une pile inappropriée risque de 
prendre feu ou d’exploser. 
Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden, explodieren 
oder schwere Verbrennungen hervorrufen. Batterien dieses Typs dürfen nicht 
aufgeladen, zerlegt, über 100 C erhitzt oder verbrannt werden. Auch darf ihr Inhalt 
nicht mit Wasser in Verbindung gebracht oder der zur richtigen Polung angebrachte 
Verbindungsstecker entfernt werden. Bei der Entsorgung die örtlichen Bestimmungen 
für Sondermüll beachten. Beim Ersetzen der Batterie nur Batterien des Typs 
verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien 
kann zu Entzündung oder Explosion führen. 
 
 
La batteria di supporto e una batteria al litio e puo incendiarsi, esplodere o procurare 
gravi ustioni. Evitare di ricaricarla, smontarne il connettore polarizzato, smontarla, 
riscaldarla ad una temperatura superiore ai 100 gradi centigradi, incendiarla o gettarla 
in acqua. Smaltirla secondo la normativa in vigore (DPR 915/82, successive 
disposizioni e disposizioni locali). L’impiego di una batteria non adatta potrebbe 
determinare l’incendio o l’esplosione della batteria stessa. 
 
 
La batería de repuesto es una batería de litio y puede provocar incendios, explosiones 
o quemaduras graves. No la recargue, ni quite el conector polarizado, ni la desmonte, 
ni caliente por encima de los 100°C (212°F), ni la incinere ni exponga el contenido de 
sus celdas al agua. Deséchela tal como dispone la normativa local. 
 
10 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							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 lavage. 
Die Leuchtstoffröhre im LCD-Bildschirm enthält Quecksilber. Bei der Entsorgung 
die örtlichen Bestimmungen für Sondermüll beachten. Der LCD-Bildschirm 
besteht aus Glas und kann zerbrechen, wenn er unsachgemäß behandelt wird 
oder der Computer auf den Boden fällt. Wenn der Bildschirm beschädigt ist und 
die darin befindliche Flüssigkeit in Kontakt mit Haut und Augen gerät, sollten 
die betroffenen Stellen mindestens 15 Minuten mit Wasser abgespült und bei 
Beschwerden anschließend ein Arzt aufgesucht werden. 
   
Nel caso che caso l’LCD si dovesse rompere ed il liquido in esso contenuto entrasse in 
contatto con gli occhi o le mani, lavare immediatamente le parti interessate con acqua 
corrente per almeno 15 minuti; poi consultare un medico se i sintomi dovessero 
permanere. 
 
 
Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos o sus manos, 
lave inmediatamente las áreas afectadas con agua durante 15 minutos como mínimo. 
Obtenga atención medica si se presenta algún síntoma del fluido despues de lavarse. 
 
Safety information 11 
						

							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 scheda invertitore. 
 
 
Para evitar descargas, no quite la cubierta de plástico que rodea la parte baja de la 
tarjeta invertida. 
 
Safety notice 7 
DANGER 
 
Though the main batteries have low voltage, a shorted or grounded battery can 
produce enough current to burn personnel or combustible materials. 
Bien que le voltage des batteries principales soit peu élevé, le court-circuit ou la mise 
à la masse d’une batterie peut produire suffisamment de courant pour brûler des 
matériaux combustibles ou causer des brûlures corporelles graves. 
Obwohl Hauptbatterien eine niedrige Spannung haben, können sie doch bei 
Kurzschluß oder Erdung genug Strom abgeben, um brennbare Materialien zu 
entzünden oder Verletzungen bei Personen hervorzurufen. 
 
 
Sebbene le batterie di alimentazione siano a basso voltaggio, una batteria in corto 
circuito o a massa può fornire corrente sufficiente da bruciare materiali combustibili o 
provocare ustioni ai tecnici di manutenzione. 
 
 
Aunque las baterías principales tienen un voltaje bajo, una batería cortocircuitada o 
con contacto a tierra puede producir la corriente suficiente como para quemar material 
combustible o provocar quemaduras en el personal. 
 
12 Lenovo 3000 N500 Hardware Maintenance Manual