IBM Mobile Systems ThinkPad Computer Hardware

Safety noticesSafety notice 2DANGERSome standby batteries contain a small amount ofnickel and cadmium. Do not disassemble a standbybattery, recharge it, throw it into fire or water, orshort-circuit it. Dispose of the battery as requiredby local ordinances or regulations. Use only thebattery in the appropriate parts listing. Use of anincorrect battery can result in ignition or explosionof the battery.Certaines batteries de secours contiennent dunickel et du cadmium. Ne les démontez pas, ne lesrechargez pas, ne les exposez ni au feu ni à l’eau.Ne les mettez pas en court-circuit. Pour les mettreau rebut, conformez-vous à la réglementation envigueur. Lorsque vous remplacez la pile desauvegarde ou celle de l’horloge temps réel, veillezà n’utiliser que les modèles cités dans la liste depièces détachées adéquate. Une batterie ou unepile inappropriée risque de prendre feu oud’exploser.Die Bereitschaftsbatterie, die sich unter demDiskettenlaufwerk befindet, kann geringe MengenNickel und Cadmium enthalten. Sie darf nur durchdie Verkaufsstelle oder den IBM Kundendienstausgetauscht werden. Sie darf nicht zerlegt,wiederaufgeladen, kurzgeschlossen, oder Feueroder Wasser ausgesetzt werden. Die Batterie kannschwere Verbrennungen oder Verätzungenverursachen. Bei der Entsorgung die örtlichenBestimmungen für Sondermüll beachten. BeimErsetzen der Bereitschafts-oder Systembatterie nurBatterien des Typs verwenden, der in derErsatzteilliste aufgeführt ist. Der Einsatz falscherBatterien kann zu Entzündung oder Explosionführen.(continued)4ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety notices(continuation of safety notice 2)Alcune batterie di riserva contengono una piccolaquantità di nichel e cadmio. Non smontarle,ricaricarle, gettarle nel fuoco o nell’acqua nécortocircuitarle. Smaltirle secondo la normativa invigore (DPR 915/82, successive disposizioni edisposizioni locali). Quando si sostituisce labatteria dell’RTC (real time clock) o la batteria disupporto, utilizzare soltanto i tipi inseritinell’appropriato Catalogo parti. L’impiego di unabatteria non adatta potrebbe determinare l’incendioo l’esplosione della batteria stessa.Algunas baterías de reserva contienen unapequeña cantidad de níquel y cadmio. No lasdesmonte, ni recargue, ni las eche al fuego o alagua ni las cortocircuite. Deséchelas tal comodispone la normativa local. Utilice sólo baterías quese encuentren en la lista de piezas. La utilizaciónde una batería no apropiada puede provocar laignición o explosión de la misma.Introduction5

Safety noticesSafety notice 3DANGERThe battery pack contains small amounts of nickel.Do not disassemble it, throw it into fire or water, orshort-circuit it. Dispose of the battery pack asrequired by local ordinances or regulations. Useonly the battery in the appropriate parts listingwhen replacing the battery pack. Use of anincorrect battery can result in ignition or explosionof the battery.La batterie contient du nickel. Ne la démontez pas,ne l’exposez ni au feu ni à l’eau. Ne la mettez pasen court-circuit. Pour la mettre au rebut,conformez-vous à la réglementation en vigueur.Lorsque vous remplacez la batterie, veillez àn’utiliser que les modèles cités dans la liste depièces détachées adéquate. En effet, une batterieinappropriée risque de prendre feu ou d’exploser.Akkus enthalten geringe Mengen von Nickel. Siedürfen nicht zerlegt, wiederaufgeladen,kurzgeschlossen, oder Feuer oder Wasserausgesetzt werden. Bei der Entsorgung dieörtlichen Bestimmungen für Sondermüll beachten.Beim Ersetzen der Batterie nur Batterien des Typsverwenden, der in der Ersatzteilliste aufgeführt ist.Der Einsatz falscher Batterien kann zu Entzündungoder Explosion führen.La batteria contiene piccole quantità di nichel. Nonsmontarla, gettarla nel fuoco o nell’acqua nécortocircuitarla. Smaltirla secondo la normativa invigore (DPR 915/82, successive disposizioni edisposizioni locali). Quando si sostituisce labatteria, utilizzare soltanto i tipi inseritinell’appropriato Catalogo parti. L’impiego di unabatteria non adatta potrebbe determinare l’incendioo l’esplosione della batteria stessa.(continued)6ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety notices(continuation of safety notice 3)Las baterías contienen pequeñas cantidades deníquel. No las desmonte, ni recargue, ni las eche alfuego o al agua ni las cortocircuite. Deséchelas talcomo dispone la normativa local. Utilice sólobaterías que se encuentren en la lista de piezas alsustituir la batería. La utilización de una batería noapropiada puede provocar la ignición o explosiónde la misma.Safety notice 4DANGERThe lithium battery can cause a fire, an explosion,or a severe burn. Do not recharge it, remove itspolarized connector, disassemble it, heat it above100 C (212 F), incinerate it, or expose its cellcontents to water. Dispose of the battery asrequired by local ordinances or regulations. Useonly the battery in the appropriate parts listing. Useof an incorrect battery can result in ignition orexplosion of the battery.La pile de sauvegarde contient du lithium. Elleprésente des risques d’incendie, d’explosion ou debrûlures graves. Ne la rechargez pas, ne retirez passon connecteur polarisé et ne la démontez pas. Nel’exposez pas à une temperature supérieure à100 C, ne la faites pas brûler et n’en exposez pasle contenu à l’eau. Mettez la pile au rebutconformément à la réglementation en vigueur. Unepile inappropriée risque de prendre feu oud’exploser.(continued)Introduction7

Safety notices(continuation of safety notice 4)Die Systembatterie ist eine Lithiumbatterie. Siekann sich entzünden, explodieren oder schwereVerbrennungen hervorrufen. Batterien dieses Typsdürfen nicht aufgeladen, zerlegt, über 100 C erhitztoder verbrannt werden. Auch darf ihr Inhalt nichtmit Wasser in Verbindung gebracht oder der zurrichtigen Polung angebrachte Verbindungssteckerentfernt werden. Bei der Entsorgung die örtlichenBestimmungen für Sondermüll beachten. BeimErsetzen der Batterie nur Batterien des Typsverwenden, der in der Ersatzteilliste aufgeführt ist.Der Einsatz falscher Batterien kann zu Entzündungoder Explosion führen.La batteria di supporto e una batteria al litio e puoincendiarsi, esplodere o procurare gravi ustioni.Evitare di ricaricarla, smontarne il connettorepolarizzato, smontarla, riscaldarla ad unatemperatura superiore ai 100 gradi centigradi,incendiarla o gettarla in acqua. Smaltirla secondola normativa in vigore (DPR 915/82, successivedisposizioni e disposizioni locali). L’impiego di unabatteria non adatta potrebbe determinare l’incendioo l’esplosione della batteria stessa.La batería de repuesto es una batería de litio ypuede provocar incendios, explosiones oquemaduras graves. No la recargue, ni quite elconector polarizado, ni la desmonte, ni caliente porencima de los 100 C (212 F), ni la incinere niexponga el contenido de sus celdas al agua.Deséchela tal como dispone la normativa local.8ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety noticesSafety notice 5If the LCD breaks and the fluid from inside the LCDgets into your eyes or on your hands, immediatelywash the affected areas with water for at least 15minutes. Seek medical care if any symptoms from thefluid are present after washing.Si le panneau d’affichage à cristaux liquides se brise etque vous recevez dans les yeux ou sur les mains unepartie du fluide, rincez-les abondamment pendant aumoins quinze minutes. Consultez un médecin si dessymptômes persistent après le lavage.Die Leuchtstoffröhre im LCD-Bildschirm enthältQuecksilber. Bei der Entsorgung die örtlichenBestimmungen für Sondermüll beachten. DerLCD-Bildschirm besteht aus Glas und kann zerbrechen,wenn er unsachgemäß behandelt wird oder derComputer auf den Boden fällt. Wenn der Bildschirmbeschädigt ist und die darin befindliche Flüssigkeit inKontakt mit Haut und Augen gerät, sollten diebetroffenen Stellen mindestens 15 Minuten mit Wasserabgespült und bei Beschwerden anschließend ein Arztaufgesucht werden.Nel caso che caso l’LCD si dovesse rompere ed illiquido in esso contenuto entrasse in contatto con gliocchi o le mani, lavare immediatamente le partiinteressate con acqua corrente per almeno 15 minuti;poi consultare un medico se i sintomi dovesseropermanere.Si la LCD se rompe y el fluido de su interior entra encontacto con sus ojos o sus manos, laveinmediatamente las áreas afectadas con agua durante15 minutos como mínimo. Obtenga atención medica sise presenta algún síntoma del fluido despues delavarse.Introduction9

Safety noticesSafety notice 6DANGERTo avoid shock, do not remove the plastic coverthat protects the lower part of the inverter card.Afin d’éviter tout risque de choc électrique, neretirez pas le cache en plastique protégeant lapartie inférieure de la carte d’alimentation.Aus Sicherheitsgründen die Kunststoffabdeckung,die den unteren Teil der Spannungswandlerplatineumgibt, nicht entfernen.Per evitare scosse elettriche, non rimuovere lacopertura in plastica che avvolge la parte inferioredella scheda invertitore.Para evitar descargas, no quite la cubierta deplástico que rodea la parte baja de la tarjetainvertida.10ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety noticesSafety notice 7DANGERThough the main batteries have low voltage, ashorted or grounded battery can produce enoughcurrent to burn personnel or combustible materials.Bien que le voltage des batteries principales soitpeu élevé, le court-circuit ou la mise à la massed’une batterie peut produire suffisamment decourant pour brûler des matériaux combustibles oucauser des brûlures corporelles graves.Obwohl Hauptbatterien eine niedrige Spannunghaben, können sie doch bei Kurzschluß oderErdung genug Strom abgeben, um brennbareMaterialien zu entzünden oder Verletzungen beiPersonen hervorzurufen.Sebbene le batterie di alimentazione siano a bassovoltaggio, una batteria in corto circuito o a massapuò fornire corrente sufficiente da bruciaremateriali combustibili o provocare ustioni ai tecnicidi manutenzione.Aunque las baterías principales tienen un voltajebajo, una batería cortocircuitada o con contacto atierra puede producir la corriente suficiente comopara quemar material combustible o provocarquemaduras en el personal.Introduction11

Safety noticesSafety notice 8DANGERBefore removing any FRU, power off the computer,unplug all power cords from electrical outlets,remove the battery pack, and then disconnect anyinterconnecting cables.Avant de retirer une unité remplaçable en clientèle,mettez le système hors tension, débranchez tousles cordons d’alimentation des socles de prise decourant, retirez la batterie et déconnectez tous lescordons d’interface.Die Stromzufuhr muß abgeschaltet, alle Stromkabelaus der Steckdose gezogen, der Akku entfernt undalle Verbindungskabel abgenommen sein, bevoreine FRU entfernt wird.Prima di rimuovere qualsiasi FRU, spegnere ilsistema, scollegare dalle prese elettriche tutti i cavidi alimentazione, rimuovere la batteria e poiscollegare i cavi di interconnessione.Antes de quitar una FRU, apague el sistema,desenchufe todos los cables de las tomas decorriente eléctrica, quite la batería y, acontinuación, desconecte cualquier cable deconexión entre dispositivos.12ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety informationSafety informationThe following section presents the safety information thatyou need to be familiar with before servicing an IBMmobile computer.General safetyFollow these rules to ensure general safety:v Observe good housekeeping in the area of themachines during and after maintenance.v When lifting any heavy object:1. Ensure you can stand safely without slipping.2. Distribute the weight of the object equally betweenyour feet.3. Use a slow lifting force. Never move suddenly ortwist when you attempt to lift.4. Lift by standing or by pushing up with your legmuscles; this action removes the strain from themuscles in your back. Do not attempt to lift anyobject that weighs more than 16 kg (35 lb) or objectsthat you think are too heavy for you.v Do not perform any action that causes hazards to thecustomer, or that makes the equipment unsafe.v Before you start the machine, ensure that other servicerepresentatives and the customer’s personnel are not ina hazardous position.v Place removed covers and other parts in a safe place,away from all personnel, while you are servicing themachine.v Keep your toolcase away from walk areas so that otherpeople will not trip over it.v Do not wear loose clothing that can be trapped in themoving parts of a machine. Make sure that your sleevesare fastened or rolled up above your elbows. If your hairis long, fasten it.v Insert the ends of your necktie or scarf inside clothing orfasten it with a nonconductive clip, approximately 8centimeters (3 inches) from the end.v Do not wear jewelry, chains, metal-frame eyeglasses, ormetal fasteners for your clothing.Attention: Metal objects are good electricalconductors.v Wear safety glasses when you are hammering, drilling,soldering, cutting wire, attaching springs, using solvents,or working in any other conditions that might behazardous to your eyes.Introduction13

Safety informationv After service, reinstall all safety shields, guards, labels,and ground wires. Replace any safety device that isworn or defective.v Reinstall all covers correctly before returning themachine to the customer.Electrical safetyObserve the following rules when working on electricalequipment.ImportantUse only approved tools and test equipment. Somehand tools have handles covered with a softmaterial that does not insulate you when workingwith live electrical currents.Many customers have, near their equipment, rubberfloor mats that contain small conductive fibers todecrease electrostatic discharges. Do not use thistype of mat to protect yourself from electrical shock.v Find the room emergency power-off (EPO) switch,disconnecting switch, or electrical outlet. If an electricalaccident occurs, you can then operate the switch orunplug the power cord quickly.v Do not work alone under hazardous conditions or nearequipment that has hazardous voltages.v Disconnect all power before:– Performing a mechanical inspection– Working near power supplies– Removing or installing main unitsv Before you start to work on the machine, unplug thepower cord. If you cannot unplug it, ask the customer topower-off the wall box that supplies power to themachine and to lock the wall box in the off position.v If you need to work on a machine that has exposedelectrical circuits, observe the following precautions:– Ensure that another person, familiar with thepower-off controls, is near you.Attention: Another person must be there to switchoff the power, if necessary.– Use only one hand when working with powered-onelectrical equipment; keep the other hand in yourpocket or behind your back.Attention: An electrical shock can occur only whenthere is a complete circuit. By observing the aboverule, you may prevent a current from passing throughyour body.14ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety information– When using testers, set the controls correctly anduse the approved probe leads and accessories forthat tester.– Stand on suitable rubber mats (obtained locally, ifnecessary) to insulate you from grounds such asmetal floor strips and machine frames.Observe the special safety precautions when you workwith very high voltages; these instructions are in thesafety sections of maintenance information. Useextreme care when measuring high voltages.v Regularly inspect and maintain your electrical hand toolsfor safe operational condition.v Do not use worn or broken tools and testers.v Never assume that power has been disconnected froma circuit. First, check that it has been powered off.v Always look carefully for possible hazards in your workarea. Examples of these hazards are moist floors,nongrounded power extension cables, power surges,and missing safety grounds.v Do not touch live electrical circuits with the reflectivesurface of a plastic dental mirror. The surface isconductive; such touching can cause personal injury andmachine damage.v Do not service the following parts with the power onwhen they are removed from their normal operatingplaces in a machine:– Power supply units– Pumps– Blowers and fans– Motor generatorsand similar units. (This practice ensures correctgrounding 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.Safety inspection guideThe purpose of this inspection guide is to assist you inidentifying potentially unsafe conditions. As each machinewas designed and built, required safety items wereinstalled to protect users and service personnel from injury.This guide addresses only those items. You should usegood judgment to identify potential safety hazards due toattachment of non-IBM features or options not covered bythis inspection guide.Introduction15

Safety informationIf any unsafe conditions are present, you must determinehow serious the apparent hazard could be and whetheryou can continue without first correcting the problem.Consider these conditions and the safety hazards theypresent:v Electrical hazards, especially primary power (primaryvoltage on the frame can cause serious or fatalelectrical shock)v Explosive hazards, such as a damaged CRT face or abulging capacitorv Mechanical hazards, such as loose or missing hardwareTo determine whether there are any potentially unsafeconditions, use the following checklist at the beginning ofevery service task. Begin the checks with the power off,and the power cord disconnected.Checklist:1. Check exterior covers for damage (loose, broken, orsharp 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 groundcontinuity for 0.1 ohm or less between the externalground pin and frame ground.b. The power cord should be the type specified in theparts list.c. Insulation must not be frayed or worn.4. Remove the cover.5. Check for any obvious non-IBM alterations. Use goodjudgment as to the safety of any non-IBM alterations.6. Check inside the unit for any obvious unsafeconditions, such as metal filings, contamination, wateror other liquids, or signs of fire or smoke damage.7. Check for worn, frayed, or pinched cables.8. Check that the power-supply cover fasteners (screwsor rivets) have not been removed or tampered with.Handling devices that are sensitive toelectorostatic dischargeAny computer part containing transistors or integratedcircuits (ICs) should be considered sensitive to electrostaticdischarge (ESD.) ESD damage can occur when there is adifference in charge between objects. Protect against ESD16ThinkPad T20, T21, T22, T23 (MT 2647/2648)

Safety informationdamage by equalizing the charge so that the machine, thepart, the work mat, and the person handling the part are

ThinkPad Computer Hardware Maintenance Manual April 2002 This manual supports: ThinkPad T20, T21, T22, T23 (MT 2647/2648) ThinkPad Dock (MT 2631) . Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations suc