Lenovo IdeaPad A3000 16GB 3G Black
Contents
1. 23 Locking the screen 23 Power management 23 Sleep standby mode 23 Lenovo IdeaTab A3000 24 Te e EE 24 FRU replacement notices 25 Screw notices 25 Removing and replacing an FRU 1010 Rear cover 1020 Battery pack 1030 System board 30 1040 Audio board 33 1050 Internal antenna 35 Rn EEN Front and Top view Right side and Bottom view 37 Pasi sobre ient ro n Ati ri ven 38 Overd ll ec nic oneri qeu 39 Ii oj i e L A n pee E TEE 41 Trademarks in i nel 42 lii About this manual iv This manual contains service and reference information for the following Lenovo IdeaPad product Lenovo IdeaTab A3000 Use this manual to troubleshoot problems The manual is divided into the following sections e The common sections provide general information guidelines and safety information reguired for servicing computers The product specific section includes service reference and product specific parts information Important This manual is intended only for trained servicers who are familiar with Lenovo IdeaPad products Use this manual to troubleshoot problems effectively Before servicing a Lenovo IdeaPad product make sure to read all the information under Safety information on page 1 and Important service info2. IdeaPad amp Microsoft and Windows are trademarks of Microsoft Corporation in the United States other countries or both The following are trademarks of Intel Corporation or its subsidiaries in the United States other countries or both Intel Intel Core 2 Duo Other company product or service names may be the trademarks or service marks of others
3. 4 x 3 5 mm flat head nylon coated 1 Silver 0 8 kgf cm 33 Lenovo IdeaTab 43000 Hardware Maintenance Manual Figure 4 Removal step of audio board continued Remove the audio board in the direction shown by arrows BI 34 Lenovo IdeaTab 43000 1050 Internal antenna For access remove these FRUs in order e 1010 Rear cover on page 27 e 1020 Battery pack on page 29 e 1030 System board on page 30 1040 Audio board on page 33 Figure 5 Removal steps of internal antenna Remove the internal antenna in the direction shown by arrow EI 35 Lenovo IdeaTab 43000 Hardware Maintenance Manual Locations 36 Front and Top view Touch screen Front camera Power button Combo audio jack Micro USB port EOS Right side and Bottom view Back camera Volume button Speakers Microphone Lenovo IdeaTab 43000 37 Lenovo IdeaTab 43000 Hardware Maintenance Manual Parts list 38 This section presents the following service parts Overall on page 39 Notes Each FRU is available for all types or models unless specific types or models are specified Lenovo IdeaTab 43000 Overall 39 Lenovo IdeaTab 43000 Hardware Maintenance Manual 40 Table 2 Parts list Overall No FRU FRU no 1 A3000H F LCD MODULE BK 90400130 1 A3000H F LCD MODUL
4. 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 lev le court circuit ou la mise la masse d une batterie peut produire suffisamment de courant pour br ler des mat riaux combustibles ou causer des br lures corporelles graves Obwohl Hauptbatterien eine niedrige Spannung haben k nnen sie doch bei KurzschluB oder Erdung genug Strom abgeben um brennbare Materialien zu entz nden oder Verletzungen bei Personen hervorzurufen 119719 Tin AD Moya 1 IPUNIN MI DID U AN 7 05125 POTD Dt PION na NP NON Y MNPO up ovn nnxn5 tx 5m Sebbene le batterie di alimentazione siano a basso voltaggio una batteria in corto circuito o a massa pu fornire corrente sufficiente da bruciare materiali combustibili o provocare ll ai tecnici di manutenzione G te lt TH Vahl HI LIA Y F Y 25 Lis Fa BE D RESTE TORRES 8 AS A20 Aunque las bater as principales tienen un voltaje bajo una bater a cortocircuitada o con contacto a tierra puede producir la corriente suficiente como para quemar material combustible o provocar quemaduras en el personal Safety information Safety notice 8 DANGER Before removing any FRU turn off the computer unplug all power cords from electrical outlets remove the battery pack and then disconnect any interconnecting cables Avant de retire
5. Ker lje a sugarnyalabbal val rintkez st Aprendo l unit vengono emesse radiazioni laser Non fissare il fascio non guardarlo direttamente con strumenti ottici e evitare l esposizione diretta al fascio OTKpbIBAA epermTecb nasepHoro manyuenus He cworpwre Ha nyy He pasrnagtisa re ero C NOMOLIBIO OMTMHECKMX MHCTPVMEHTOB a TAKXE w36eraitre npsiworo BOSAE CTBMA na3epHoro nysa Ked je laserov jednotka otvoren Vyhnite sa priamemu poh adu a nehladte priamo s optick mi n strojmi do a a vyhnite sa priamemu vystaveniu l ov Moak J n KT HERE LODE HP MME Eo THEA FLAT Radiaci n l ser al abrir No mire fijamente ni examine con instrumental ptico el haz de luz Evite la exposici n directa al haz 15 Lenovo IdeaTab 43000 Hardware Maintenance Manual Important service information This chapter presents the following important service information e Strategy for replacing FRUs on page 16 Important notice for replacing a system board on page 17 Important information about replacing RoHS compliant FRUs on page 18 Important BIOS and device driver fixes are customer installable The BIOS and device drivers are posted on the customer support site http consumersupport lenovo com Strategy for replacing FRUs Before replacing parts Make sure that all software fixes drivers and BIOS downloads are installed before replacing any FRUs listed in this
6. di una batteria non adatta potrebbe determinare l incendio o l esplosione della batteria stessa PS gt FU OPICNSYRO EE KES GARE ENT ON EU ET LEBT eve FI A BR KERRKOPANDRIE CEIRRLTTDAW CC EE Ny FY ERRET B hak Jako KIE Ko lt lt FEU DAY JA WEE ak TOD EL REV Bok Ny FY ERHTSL y7 A KLED BALE SES is Algunas bater as de reserva contienen una pequefia cantidad de niquel y cadmio No las desmonte ni recargue ni las eche al fuego o al agua ni las cortocircuite Des chelas tal como dispone la normativa local Utilice s lo bater as que se encuentren en la lista de piezas La utilizaci n de una bater a no apropiada puede provocar la ignici n o explosi n de la misma Safety information 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 reguired 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 d montez pas ne l exposez ni au feu ni l eau Ne la mettez pas en court circuit Pour la mettre au rebut conformez vous la r glementation en vigueur Lorsque vous remplacez la batterie veillez n utiliser que les mod les cit s dans la liste de pi ces d tach es ad quate En effet une batterie in
7. manual After a system board is replaced ensure that the latest BIOS is loaded to the system board before completing the service action To download software fixes drivers and BIOS follow the steps below 1 Go to http consumersupport lenovo com 2 Enter a serial number or select a product or use Lenovo smart downloading 3 Select the BlOS Driver Applications and download 4 Follow the directions on the screen and install the necessary software 16 Important service information Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs f you are instructed to replace an FRU but the replacement does not solve the problem reinstall the original FRU before you continue Some computers have both a processor board and a system board If you are instructed to replace either of them and replacing one of them does not solve the problem reinstall that board and then replace the other one fan adapter or a device consists of more than one FRU any of the FRUs may be the cause of the error Before replacing the adapter or device remove the FRUs one by one to see if the symptoms change Replace only the FRU that changed the symptoms Attention The setup configuration on the computer you are servicing may have been customized Running Automatic Configuration may alter the settings Note the current configuration settings using the View Configuration option then when service has been co
8. E W 90400132 2 A3000 GPS antenna asm 30500403 3 A3000 LCD fpc 145500106 4 HS RCV XHR150622SW39P37 08 H2 4 spring 30500376 4 RECEIVER 182000976 5 A3000H F AUDIO BOARD 90003069 6 A3000 mic fpc 145500108 7 A3000H 3G 1GDDR2 4GeMMC BK PRC 90003066 7 A3000H 3G 1GDDR2 8GeMMC WT PRC 90003067 7 A3000H 3G 1GDDR2 16GeMMC BK PRC 90003068 7 A3000 RoW 3G 1GDDR2 4GeMMC MB 90003217 8 LTA GCBF120186R 0 3M FF Hi 704 Camera 20200330 9 XWD C L12D1P31 3 7V 13 0Wh 1cell bty 121500179 9 TWS A L12T1P33 3 7V 13 0Wh 1cell bty 121500194 9 A3000 TWS C L12T1P33 3 7V 13 0Wh 1cell 121500178 9 A3000 TWS L L12T1P33 3 7V 13 0Wh 1cell 121500180 10 QTE FH542AA 5 0M AF Hi 542 Camera 20200431 10 SUN P5H02A 5 0M AF Hi 542 Camera 20200432 11 A3000 VOLUME KEY silver 30500365 11 A3000 VOLUME KEY 30500363 12 A3000 POWER KEY silver 30500366 12 A3000 POWER KEY 30500364 13 A3000 C COVER ASM WT 90202848 13 A3000 C COVER ASM BK 90202849 14 Screw PM1 4X2 5X2 7 Screw 141500056 Adapter CY C P30 5V1 5A Adapter 36 200433 Lenovo IdeaTab 43000 Notices Lenovo may not offer the products services or features discussed in this document in all countries Consult your local Lenovo representative for information on the products and services currently available in your area Any reference to a Lenovo product program or service is not intended to state or imply that only that Lenovo product program or service may be used Any functionally eguivalent product program or s
9. Polung angebrachte Verbindungsstecker entfernt werden Bei der Entsorgung die rtlichen Bestimmungen f r Sonderm ll beachten Beim Ersetzen der Batterie nur Batterien des Typs verwenden der in der Ersatzteilliste aufgef hrt ist Der Einsatz falscher Batterien kann zu Entz ndung oder Explosion f hren y mssanns na 105 QAS Addy DPD MID MANDA nx p v5 WIND NMN PHY yx mop mad AMENDS NMN BONY IN NMN Prod n v am PO zm ix 41605 PN ortos MSIE 100 5y ADA UT NIN nx pro v DD KAN 1m nx PUNI Dag p VKHUNS v o nmpnn opima MIPNA n 5 5103 WW PNN o p5nn na va3 Awan manon IN no 133905 91135 Noy MINN 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 YFA NIFI X Xe ELRENDELI TE IET kko ZTIT RIF V ORB TOIR DBUML RYT V 100 C 212 F DE DADA HA BMOPREKCBIT x LLT HE VW S9FI CEET EE ESV BAR RY VR REDDIT IEE Poor UE EATS L NYT VU BRBALEYD MALE SEC adboxi La bater a de repuesto es una bater a de litio y puede provocar incendios explosiones o quemaduras graves No la recargue ni quite el con
10. SD protective devices you use have been certified 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 Wear a grounded wrist strap against your skin to eliminate static on your body Prevent the part from touching your clothing Most clothing is insulative and retains a charge even when you are wearing a wrist strap Use the black side of a grounded work mat to provide a static free work surface The mat is especially useful when handling ESD sensitive devices Select a grounding system such as those listed below to provide protection that meets the specific service requirement Note The use of a grounding system to guard against ESD damage is desirable but not necessary 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 You 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 Safety information Safety notices multilingual translati
11. Turn an additional 90 after the screw head touches the surface of the plastic part more than 90 VEM Logic card to plastic Turn an additional 180 after the screw head touches the surface of the logic card more than 180 ZZZZERZZT ZZZL 777 Cross section Torque driver If you have a torque screwdriver refer to the Torque column for each step Make sure that you use the correct screws If you have a torque screwdriver tighten all screws firmly to the torque shown in the table Never use a screw that you removed Use a new one Make sure that all screws are tightened firmly Ensure torque screwdrivers are calibrated correctly following country specifications 25 Lenovo IdeaTab 43000 Hardware Maintenance Manual Removing and replacing an FRU 26 This section presents exploded figures with the instructions to indicate how to remove and replace the FRU Make sure to observe the following general rules 1 Do not attempt to service any computer unless you have been trained and certified An untrained person runs the risk of damaging parts 2 Before replacing any FRU review FRU replacement notices on page 25 3 Begin by removing any FRUs that have to be removed before the failing FRU Any of such FRUs are listed at the top of the page Remove them in the order in which they are listed 4 Follow the correct sequence in the steps to remove the FRU as given in the figures by the numbers i
12. al Utilice solo baterias que se encuentren en la lista de piezas al sustituir la bateria La utilizacion de una bateria no apropiada puede provocar la ignici n o explosi n de la misma Lenovo IdeaTab 43000 Hardware Maintenance Manual 10 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 pr sente des risques d incendie d explosion ou de br lures graves Ne la rechargez pas ne retirez pas son connecteur polaris et ne la d montez pas Ne l exposez pas une temperature sup rieure 100 C ne la faites pas br ler et n en exposez pas le contenu l eau Mettez la pile au rebut conform ment la r glementation en vigueur Une pile inappropri e risque de prendre feu ou d exploser Die Systembatterie ist eine Lithiumbatterie Sie kann sich entz nden explodieren oder schwere Verbrennungen hervorrufen Batterien dieses Typs d rfen nicht aufgeladen zerlegt ber 100 C erhitzt oder verbrannt werden Auch darf ihr Inhalt nicht mit Wasser in Verbindung gebracht oder der zur richtigen
13. appropri e risque de prendre feu ou d exploser Akkus enthalten geringe Mengen von Nickel Sie d rfen nicht zerlegt wiederaufgeladen kurzgeschlossen oder Feuer oder Wasser ausgesetzt werden Bei der Entsorgung die rtlichen Bestimmungen f r Sonderm ll beachten Beim Ersetzen der Batterie nur Batterien des Typs verwenden der in der Ersatzteilliste aufgef hrt ist Der Einsatz falscher Batterien kann zu Entz ndung oder Explosion f hren 5pn 5v mop maa 535 NIINON NA TN en THN NN PAOD vx ovo AN 7709 W AMN p5 IN OND Y UNS mx Mapnn P 5y man gn AOA ND 15904 p VANUD v mb epmnm non JU minonn IN nmm ov La batteria contiene piccole quantit di nichel Non smontarla gettarla nel fuoco o nell acqua n 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 BYP SA ILEDED vB E LCE YFU 2392 EAR LIED dto mici AAJEO absum cx RYT V SY ORE I gt cii Hr Bia ADI RINE T CREW So TU ET LII BIS Y gt DA RS RITVD IEVEMM LTC REY Bok y d ZA TAL NYT Y BRALEY MBLEVTSIOLMHVETF Las baterias contienen pequefias cantidades de niquel No las desmonte ni recargue ni las eche al fuego o al agua ni las cortocircuite Des chelas tal como dispone la normativa loc
14. battery pack Battery charging does not start until the Power Meter shows that less than 95 of the total power remains under this condition the battery pack can charge to 100 of its capacity This protects the battery pack from being overcharged or from having a shortened life Tap the battery icon in the icon tray and the percentage of battery power remaining is displayed To get detailed information about the battery tap Battery under Settings In the applications list to enter the battery information interface Note If the battery pack becomes hot it may not be able to be charged Remove it from the computer and leave it at room temperature for a while After it cools down reinstall and recharge it To check the battery pack follow the steps below 1 Tum off the computer Follow the removal steps in 1020 Battery pack on page 29 in Removing and replacing an FRU on page 26 2 Measure the voltage between battery terminals 1 and 6 See the following figure Terminal Voltage V DC gt aw 1 0 to 3 4 RK at 3 No 6 Ground 3 Za e 6 3 Ifthe voltage is less than 3 4 V DC the battery pack has been discharged Note Recharging will be continued for at least 3 hours even though the indicator does not light on If the voltage is still less than 3 4 V DC after recharging replace the battery Related service information Related service information This chapt
15. ector 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 Des chela tal como dispone la normativa local Safety information Safety notice 5 Ifthe LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands immediately wash the affected areas with water at least for 15 minutes Seek medical care if any symptoms caused by the fluid are present after washing Si le panneau d affichage 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 m decin si des sympt mes persistent apr s le lavage Die Leuchtstoffr hre im LCD Bildschirm enth lt Quecksilber Bei der Entsorgung die rtlichen Bestimmungen f r Sonderm ll beachten Der LCD Bildschirm besteht aus Glas und kann zerbrechen wenn er unsachgem B behandelt wird oder der Computer auf den Boden f llt Wenn der Bildschirm besch digt ist und die darin befindliche Fl ssigkeit in Kontakt mit Haut und Augen ger t sollten die betroffenen Stellen mindestens 15 Minuten mit Wasser abgesp lt und bei Beschwerden anschlieBend ein Arzt aufgesucht werden IANI Na TOON Tino 5rom ov LCD ue wan JOD ON 7002 n3 PD DYN omn NN WOW Dm IN D y OV D Mumm DNDN ON MNN mi NIIP 19 mns MPT 15 JABVWA INNI DWD INN DY Yann Nel caso che caso l LCD si dovesse rompere ed il li
16. eguirements and schedule in the EU Products sold in 2005 and 2006 will contain some RoHS compliant FRUs The following statement pertains to these products and any product Lenovo produces containing RoHS compliant FRUs RoHS compliant FRUs have unigue FRU part numbers Before or after the RoHS implementation date failed RoHS compliant parts must always be replaced with RoHS compliant ones so only the FRUs identified as compliant in the system HMM or direct substitutions for those FRUs may be used Products marketed before June 2006 Products marketed after June 2006 Current or original Replacement FRU Current or Replacement part original part FRU Non RoHS Can be Non RoHS Must be RoHS Must be RoHS Non RoHS Can be RoHS Non RoHS Can sub to RoHS RoHS Must be RoHS Note A direct substitution is a part with a different FRU part number that is automatically shipped by the distribution center at the time of the order General checkout General checkout This chapter presents the following information What to do first on page 20 Power system checkout on page 21 Before you go to the checkout make sure to read the following important notes Important notes Only certified trained personnel can service the computer Before replacing any FRU read the entire page on removing and replacing FRUs When you replace FRUs use new nylon coated screws Be extremely careful dur
17. ensioni siano nella corretta posizione e non siano sparse all interno dell elaboratore Verificare ci scuotendo l elaboratore e prestando attenzione ad eventuali rumori eventuali parti o pezzetti metallici possono provocare cortocircuiti pericolosi FRU OZ vua ORE Ah DIE AL AK ROOTED y AE LERCH EKIYUaA 2OAMB CRA TUR Z LA RER L T lt 7280 COAT DILI AT La Ado TC 34x x LED L ARM E T LEAR BAT iy a RON 28 ZE DS 0 ET Antes de encender el sistema despues de sustituir una FRU compruebe que todos los tornillos muelles y dem s piezas peque as se encuentran en su sitio y no se encuentran sueltas dentro del sistema Compru belo agitando el sistema y escuchando los posibles ruidos que provocarian Las piezas met licas pueden causar cortocircuitos el ctricos Lenovo IdeaTab 43000 Hardware Maintenance Manual 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 reguired 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 d montez pas ne les rechargez pas ne les exposez ni au feu ni l eau Ne les mettez pas en court circuit Pour les mettre au rebut conform
18. er presents the following information Locking the screen on page 23 Power management on page 23 Locking the screen To set the lock screen function do the following 1 Power on your computer 2 Tap Security under Settings In the applications list to enter the screen lock settings interface 3 Tap Screen lock to set the screen unlock mode Note You are able to lock the screen to protect your computer data in one of the four ways Slide lock Pattern lock PIN lock and Password lock You can also deactivate the screen lock here as well Power management To reduce power consumption the IdeaTab has a Sleep standby mode Sleep standby mode To put your device in Sleep mode press the Power button This will turn the display off To turn the display on press the Power button again 23 Lenovo IdeaTab 43000 Hardware Maintenance Manual Lenovo IdeaTab A3000 This chapter presents the following product specific service references and product specific parts information Specifications on page 24 FRU replacement notices on page 25 e Removing and replacing an FRU on page 26 Locations on page 36 e Parts list on page 38 Specifications The following table lists the specifications of the Lenovo IdeaTab A3000 Table 1 Specifications Feature Description Processor Chipset MTK MT8389 3G MT8319 WIFi Graphic memory chip MT83x9 Inte
19. ervice that does not infringe any Lenovo intellectual property right may be used instead However it is the user s responsibility to evaluate and verify the operation of any other product program or Service Lenovo may have patents or pending patent applications covering subject matter described in this document The furnishing of this document does not give you any license to these patents LENOVO GROUP LTD PROVIDES THIS PUBLICATION AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF NON INFRINGEMENT MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Some jurisdictions do not allow disclaimer of express or implied warranties in certain transactions therefore this statement may not apply to you This information could include technical inaccuracies or typographical errors Changes are periodically made to the information herein these changes will be incorporated in new editions of the publication Lenovo may make improvements and or changes in the product s and or the program s described in this publication at any time without notice The products described in this document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons The information contained in this document does not affect or change Lenovo product specifications or warranties Nothing in this document shall operate as an exp
20. ez vous la r glementation en vigueur Lorsque vous remplacez la pile de sauvegarde ou celle de l horloge temps r el veillez n utiliser que les mod les cit s dans la liste de pi ces d tach es ad quate Une batterie ou une pile inappropri e risque de prendre feu ou d exploser Die Bereitschaftsbatterie die sich unter dem Diskettenlaufwerk befindet kann geringe Mengen Nickel und Cadmium enthalten Sie darf nicht zerlegt wiederaufgeladen kurzgeschlossen oder Feuer oder Wasser ausgesetzt werden Bei der Entsorgung die rtlichen Bestimmungen f r Sonderm ll beachten Beim Ersetzen der Bereitschafts oder Systembatterie nur Batterien des Typs verwenden der in der Ersatzteilliste aufgef hrt ist Der Einsatz falscher Batterien kann zu Entz ndung oder Explosion f hren mop mo mnan manon mnnn MI AMAN NINO prod PN ovp 9793 Sw PN ovr IN UND NMN POWAY WIND NMN myo5 AINON NN PIDI v NMN ISPI IN Dap V Gre DNM MPNA m dy WINI DPIN nova NMDHA NIDA p vionuns naa NY Dem viov MAIKA m ng JW MINAN IN ANSNI oro Alcune batterie di riserva contengono una piccola quantit di nichel e cadmio Non smontarle ricaricarle gettarle nel fuoco o nell acqua n 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
21. f Federal Regulations DHHS 21 CFR Subchapter J for Class 1 laser products Elsewhere the drive is certified to conform to the requirements of the International Electrotechnical Commission IEC 825 and CENELEC EN 60 825 for Class 1 laser products If a CD ROM drive a DVD ROM drive or another laser device is installed note the following CAUTION Use of controls or adjustments or performance of procedures other than those specified herein might result in hazardous radiation exposure O uso de controles ajustes ou desempenho de procedimentos diferentes daqueles aqui especificados pode resultar em perigosa exposi o radia o ARE MR AEA ES ABIRE Wi rn Be SERRE Pour viter tout risque d exposition au rayon laser respectez les consignes de r glage et d utilisation des commandes ainsi que les proc dures d crites Werden Steuer und Einstellelemente anders als hier festgesetzt verwendet kann gef hrliche Laserstrahlung auftreten Az itt el rt elj r sokt l be ll t sokt l s vezeri sektdi elt rni a l zersug rz s vesz lye miatt kock zatos l L utilizzo di controlli regolazioni o l esecuzione di procedure diverse da quelle specificate possono provocare l esposizione a Mcnonb30BaHWMe 3n8MeHTOB HACTPOMKA M BbINONHEHME npouenyp WS YEM VKABBHO 3A Cb MOXeT MPMBECTM K ONACHOMV palMaLiMOHHOMY O JIVHEHMIO Pou itie kontr l prav alebo inych vvkonani od in ch vyrobcov ako je v tomto pecifi
22. ing such write operations as copying saving or formatting Drives in the computer that you are servicing seguence might have been altered If you select an incorrect drive data or programs might be overwritten Replace an FRU only with another FRU of the correct model When you replace an FRU make sure that the machine model and the FRU part number are correct by referring to the FRU parts list An FRU should not be replaced just because of a single unreproducible failure Single failures can occur for a variety of reasons that have nothing to do with a hardware defect such as cosmic radiation electrostatic discharge or software errors Consider replacing an FRU only when a problem recurs If you suspect that an FRU is defective clear the error logs and run the test again If the error does not recur do not replace the FRU Be careful not to replace a nondefective FRU 19 Lenovo IdeaTab 43000 Hardware Maintenance Manual What to do first 20 When you do return an FRU you must include the following information in the parts exchange form or parts return form that you attach to it 1 Name and phone number of servicer Date of service Date on which the machine failed Date of purchase Procedure index and page number in which the failing FRU was detected Failing FRU name and part number Machine type model number and serial number Customer s name and address o NN 1 WN Note for warranty During the war
23. kovand mohlo by mat za n sledok nebezpe enstvo vystavenia sa vy iarovaniu AG CHESHEABUAO EE Lem WH KAER AT KAR vo GOD OR Of RR DO x3 El uso de controles o ajustes o la ejecuci n de procedimientos distintos de los aqui especificados puede provocar la exposici n a radiaciones peligrosas Opening the CD ROM drive the DVD ROM drive or any other optical storage device could result in exposure to hazardous laser radiation There are no serviceable parts inside those drives Do not open Safety information A CD ROM drive a DVD ROM drive or any other storage device installed may contain an embedded Class 3A or Class 3B laser diode Note the following DANGER Emits visible and invisible laser radiation when open Do not stare into the beam do not view directly with optical instruments and avoid direct exposure to the beam Radiag o por raio laser ao abrir N o olhe fixo no feixe de luz n o olhe diretamente por meio de instrumentos ticos e evite exposi o direta com o feixe de luz TRIS EAT MJ RAIN TROUT RO MAI ER MURS FARRAH EE Rayonnement laser si carter ouvert Evitez de fixer le faisceau de le regarder directement avec des instruments optiques ou de vous exposer au rayon Laserstrahlung bei ge ffnetem Ger t Nicht direkt oder ber optische Instrumente in den Laserstrahl sehen und den Strahlungsbereich meiden Kinyit skor l zersugar Ne n zzen bele se szabad szemmel se optikai eszk z kkel
24. lenovo IdeaTab A3000 Hardware Maintenance Manual Note Before using this information and the product it supports be sure to read the general information under Notices on page 41 First Edition May 2013 Copyright Lenovo 2013 All rights reserved LIMITED AND RESTRICTED RIGHTS NOTICE If data or software is delivered pursuant a General Services Administration GSA contract use reproduction or disclosure is subject to restrictions set forth in Contract No GS 35F 05925 2013 Lenovo Contents About this manual iv Safety information 1 General safety 2 Electrical safety Safety inspection guide Handling devices that are sensitive to electrostatic discharge 6 Grounding requirements ss en 6 Safety notices multilingual translations 7 Laser compliance statement 14 Important service information 16 Strategy for replacing FRUS 16 Important notice for replacing a system board iet 17 Important information about replacing RoHS compliant FR S sc 5 etie eie ton etin 18 General checkout esses 19 What to UC nitens 20 Power system checkout 21 Checking the AC adapter 21 Checking the battery pack 22 Related service information
25. m board Ifyou put a system board down make sure to put it only on a padded surface such as an ESD mat or conductive corrugated material For access remove these FRUS in order e 1010 Rear cover on page 27 e 1020 Battery pack on page 29 Figure 3 Removal steps of system board Detach the LCD connector and touch panel connector in the direction shown by arrows EE Fl Remove the volume button FPC in the direction shown by arrow El Figure 3 Removal steps of system board continued Remove the three screws EX Lenovo IdeaTab A3000 Step Screw quantity Color Torque M1 4 x 3 5 mm flat head nylon coated 3 Silver 0 8 kgf cm 31 Lenovo IdeaTab 43000 Hardware Maintenance Manual Figure 3 Removal steps of system board continued Gently turn over the system board in the direction shown by arrow El Detach the audio board connector in the direction shown by arrows H When installing Make sure that all the connectors are firmly attached Carefully lift the motor and then remove the system board in the direction shown by arrow El 32 Lenovo IdeaTab 43000 1040 Audio board For access remove these FRUs in order e 1010 Rear cover on page 27 e 1020 Battery pack on page 29 e 1030 System board on page 30 Figure 4 Removal step of audio board Remove the screw Ell Step Screw quantity Color Torque M1
26. mpleted verify that those settings remain in effect Important notice for replacing a system board Some components mounted on a system board are very sensitive Improper handling can cause damage to those components and may cause a system malfunction Attention When handling a system board Do not drop the system board or apply any excessive force to it Avoid rough handling of any kind Avoid bending the system board and hard pushing to prevent cracking at each BGA Ball Grid Array chipset 17 Lenovo IdeaTab 43000 Hardware Maintenance Manual Important information about replacing RoHS compliant FRUs 18 RoHS The Restriction of Hazardous Substances in Electrical and Electronic Eguipment Directive 2002 95 EC is a European Union legal reguirement affecting the global electronics industry RoHS reguirements must be implemented on Lenovo products placed on the market after June 2006 Products on the market before June 2006 are not reguired to have RoHS compliant parts If the original FRU parts are non compliant replacement parts can also be non compliant In all cases if the original FRU parts are RoHS compliant the replacement part must also be RoHS compliant Note RoHS and non RoHS FRU part numbers with the same fit and function are identified with unigue FRU part numbers Lenovo plans to transit to RoHS compliance well before the implementation date and expects its suppliers to be ready to support Lenovo s r
27. n Place removed covers and other parts in a safe place keeping them away from all personnel while you are servicing the machine Keep your toolcase away from walk areas so that other people will not trip it over Do not wear loose clothing that can be trapped in the moving parts of the machine Make sure that your sleeves are fastened or rolled up above your elbows If your hair is long fasten it Insert the ends of your necktie or scarf inside clothing or fasten it with the nonconductive clip about 8 centimeters 3 inches from the end Do not wear jewelry chains metal frame eyeglasses or metal fasteners for your clothing Attention Metal objects are good electrical conductors Wear safety glasses when you are hammering drilling soldering cutting wire attaching springs using solvents or working in any other conditions that may be hazardous to your eyes After service reinstall all safety shields guards labels and ground wires Replace any safety device that is worn or defective Reinstall all covers correctly before returning the machine to the customer Fan louvers on the machine help to prevent the overheating of internal components Do not obstruct fan louvers or cover them with labels or stickers Safety information Electrical safety Observe the following rules when working on electrical eguipments Important Use only approved tools and test eguipments Some hand tools have handles covered
28. n square callouts 5 When turning a screw to replace an FRU turn it in the direction as given by the arrow in the figure 6 When removing the FRU move it in the direction as given by the arrow in the figure 7 To put the new FRU in place reverse the removal procedures and follow any of the notes that pertain to replacement For information about connecting and arranging internal cables see Locations on page 36 8 When replacing an FRU use the correct screw as shown in the procedures DANGER Before removing any FRU turn off the computer unplug all power cords from electrical outlets remove the battery pack and then disconnect any of the interconnecting cables Attention After replacing an FRU do not turn on the computer until you have made sure that all screws springs and other small parts are in place and none are loose inside the computer Verify this by shaking the computer gently and listening for rattling sounds Metallic parts or metal flakes can cause electrical short circuits Attention The system board is sensitive to and can be damaged by electrostatic discharge Before touching it establish personal grounding by touching a ground point with one hand or using an electrostatic discharge ESD strap P N 6405959 to remove potential shock reasons Lenovo IdeaTab 43000 1010 Rear cover Figure 1 Removal steps of rear cover Note Turn off the IdeaTab before you begin Failure to do so may cause
29. nsures correct grounding of the units Ifan electrical accident occurs Caution do not become a victim yourself Switch off the power Sendthe victim to get medical aid Safety information Safety inspection guide The purpose of this inspection guide is to assist you in identifying potential unsafe conditions As each machine was designed and built reguired safety items were installed to protect users and service personnel from injury This guide addresses only those items You should use good judgment to identify potential safety hazards according to the attachment of non Lenovo IdeaPad 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 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 a bulging capacitor Mechanical hazards such as loose or missing hardware To determine whether there are any potential 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 Tum off the comp
30. ons 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 apr s remplacement d une unit en client le v rifiez que tous les ressorts vis et autres pi ces sont bien en place et bien fix es Pour ce faire secouez l unit et assurez vous qu aucun bruit suspect ne se produit Des pieces m talliques ou des copeaux de m tal pourraient causer un court circuit Bevor nach einem FRU Austausch der Computer wieder angeschlossen wird mu sichergestellt werden daB keine Schrauben Federn oder andere Kleinteile fehlen oder im Geh use vergessen wurden Der Computer mu gesch ttelt und auf Klapperger usche gepr ft werden Metallteile oder splitter k nnen Kurzschl sse erzeugen KT v FRU rann JANI AWADN NIYIN 92 ONY DIN DHOP OPM oO spn Don JIW MI 273 IVNN TINA MI o venn DYN DOHI Pwpw mop NA DPN avnon NN 50505 v NNT Dapp Grp OY DS NIND JJAW IN PSN Prima di accendere l elaboratore dopo che stata effettuata la sostituzione di una FRU accertarsi che tutte le viti le molle e tutte le altri parti di piccole dim
31. permanent damage to the IdeaTab Remove the battery cover from the corner EI Remove the battery cover in the direction shown by arrow BI 27 Lenovo IdeaTab 43000 Hardware Maintenance Manual Figure 1 Removal steps of base cover continued Remove the fifteen screws EI T Step Screw quantity Color Torque M1 4 x 3 5 mm flat head nylon coated 15 Silver 0 8 kgf cm Insert a plastic plate tool and gently disassemble the rear cover by the tool in the direction shown by arrows El then remove the rear cover in the direction shown by arrow Bi 28 Lenovo IdeaTab 43000 1020 Battery pack For access remove this FRU 1010 Rear cover on page 27 DANGER Only use the battery specified in the parts list for your computer Any other battery could ignite or explode Figure 2 Removal steps of battery pack Disconnect the battery connector in the direction shown by arrow Kl Gently disassemble the battery pack by the plastic plate tool 29 Lenovo IdeaTab 43000 Hardware Maintenance Manual 30 1030 System board Important notices for handling the system board When handling the system board bear the following in mind Be careful not to drop the system board on a bench top that has a hard surface such as metal wood or composite Avoid rough handling of any kind nthe whole process make sure not to drop or stack the syste
32. 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 Be extremely careful when you measure the high voltages Regularly inspect and maintain your electrical hand tools for safe operational condition Do not use worn or broken tools and testers Never assume that power has been disconnected from a circuit First check it to make sure that it has been powered off Lenovo IdeaTab 43000 Hardware Maintenance Manual 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 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 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 and similar units This practice e
33. quido 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 LCD AL LCD OP OMABAICATED FICARIUE b LEBAL W Haih ef Dre E b 15 BUE CSL DEL LAIT i ik ick 2THEHOERIANESRI RMORRERI TC ESV Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos 0 sus manos lave inmediatamente las areas afectadas con agua durante 15 minutos como m nimo Obtenga atenci n medica si se presenta algun sintoma del fluido despues de lavarse 11 A Lenovo IdeaTab 43000 Hardware Maintenance Manual 12 Safety notice 6 DANGER To avoid shock do not remove the plastic cover that protects the lower part of the inverter card Afin d viter tout risque de choc lectrique ne retirez pas le cache en plastique prot geant la partie inf rieure de la carte d alimentation Aus Sicherheitsgr nden die Kunststoffabdeckung die den unteren Teil der Spannungswandlerplatine umgibt nicht entfernen p ov5an nv3b NN PONI px MDA Map vm nn WYN JU NNNNA Yon DN pon Per evitare scosse elettriche non rimuovere la copertura in plastica che avvolge la parte inferiore della scheda invertitore REED ib LwA A A VWOTERSLCCOSZZ2ATvy7 3 ISERE TANT E EU Ve Para evitar descargas no quite la cubierta de pl stico que rodea la parte baja de la tarjeta invertida Safety notice 7
34. r une unit rempla able en client le mettez le syst me hors tension d branchez tous les cordons d alimentation des socles de prise de courant retirez la batterie et d connectez tous les cordons d interface Die Stromzufuhr muB abgeschaltet alle Stromkabel aus der Steckdose gezogen der Akku entfernt und alle Verbindungskabel abgenommen sein bevor eine FRU entfernt wird Aunan NN MASS w Aug FRU pry app WANNI nunn PVD Dun 5522 53 nx pmo DINN NIN 5535 pm tW Damen PIND NN VIKI U ON Prima di rimuovere gualsiasi FRU spegnere il sistema scollegare dalle prese elettriche tutti i cavi di alimentazione rimuovere la batteria e poi scollegare i cavi di interconnessione FRU 0 7 BIT ThinkPad DAMET lt cCOf l2 FE2LE YRPLALTC REV KIT AVF V AY 7 EAL MT ST BALTS ESV Antes de quitar una FRU apague el sistema desenchufe todos los cables de las tomas de corriente el ctrica quite la bateria y a continuaci n desconecte cualquier cable de conexi n entre dispositivos 13 Lenovo IdeaTab 43000 Hardware Maintenance Manual Laser compliance statement 14 Some models of Lenovo IdeaPad computer are eguipped from the factory with an optical storage device such as a CD ROM drive or a DVD ROM drive Such devices are also sold separately as options If one of these drives is installed it is certified in the U S to conform to the requirements of the Department of Health and Human Services 21 Code o
35. ranty period the customer may be responsible for repair costs if the computer damage was caused by misuse accident modification unsuitable physical or operating environment or improper maintenance by the customer The following is a list of some common items that are not covered under warranty and some symptoms that might indicate that the system was subjected to stress beyond normal use Before checking problems with the computer determine whether the damage is covered under the warranty by referring to the following list The following are not covered under warranty LCD panel cracked from the application of excessive force or from being dropped Scratched cosmetic parts Distortion deformation or discoloration of the cosmetic parts Plastic parts latches pins or connectors that have been cracked or broken by excessive force Damage caused by liquid spilled into the system Damage caused by the improper insertion of a PC Card or the installation of an incompatible card Improper disc insertion or use of an optical drive Diskette drive damage caused by pressure on the diskette drive cover foreign material in the drive or the insertion of a diskette with multiple labels Damaged or bent diskette eject button Fuses blown by attachment of a nonsupported device Forgotten computer password making the computer unusable Sticky keys caused by spilling a liquid onto the keyboard Use of an incorrect AC adap
36. ress or implied license or indemnity under the intellectual property rights of Lenovo or third parties All information contained in this document was obtained in specific environments and is presented as an illustration The result obtained in other operating environments may vary Lenovo may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you Any references in this publication to non Lenovo Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites The materials at those Web sites are not part of the materials for this Lenovo product and use of those Web sites is at your own risk 41 Lenovo IdeaTab 43000 Hardware Maintenance Manual Any performance data contained herein was determined in a controlled environment Therefore the result obtained in other operating environments may vary significantly Some measurements may have been made on development level systems and there is no guarantee that these measurements will be the same on generally available systems Furthermore some measurements may have been estimated through extrapolation Actual results may vary Users of this document should verify the applicable data for their specific environment Trademarks 42 The following terms are either registered trademarks or trademarks of Lenovo in the United States and or other countries Lenovo Lenovo logo
37. rgrated Display 7 0 LED backlight e 1024 x 600 pixels Storage LP DDR2 1GB eMMC 4GB 8GB 16GB support up to 32GB capacity UO port Micro USB connector x 1 for power charge and data sync MicroSD slot x 1 e SIM card slot x 2 Combo audio jack x 1 Microphone hole x 1 Speaker x 2 PCI Express Mini Card slot Wi Fi 802 11 b g n Bluetooth wireless Bluetooth 4 0 Keyboard N A Touch screen Support Multi touch Integrated camera 0 3 M front camera 5 0 M back camera Battery 3500 mAH AC adapter 5V 1 5A charge from micro USB port Pre installed operating Android version 4 2 system 24 Lenovo IdeaTab 43000 FRU replacement notices This section presents notices related to removing and replacing parts Read this section carefully before replacing any FRU Screw notices Loose screws can cause a reliability problem In the Lenovo IdeaPad computer this problem is addressed with special nylon coated screws that have the following characteristics They maintain tight connections They do not easily come loose even with shock or vibration Theyare harder to tighten Eachone should be used only once Do the following when you service this machine Keep the screw kit in your tool bag Always use new screws Useatorque screwdriver if you have one Tighten screws as follows Plastic to plastic
38. rmation on page 16 Safety information Safety information This chapter presents the following safety information that you need to get familiar with before you service an IdeaTab A3000 computer General safety on page 2 Electrical safety on page 3 e Safety inspection guide on page 5 Handling devices that are sensitive to electrostatic discharge on page 6 e Grounding requirements on page 6 Safety notices multilingual translations on page 7 Laser compliance statement on page 14 Lenovo IdeaTab 43000 Hardware Maintenance Manual General safety Follow these rules below to ensure general safety Observe a good housekeeping in the area where the machines are put during and after the maintenance When lifting any heavy object 1 Make sure that you can stand safely without slipping 2 Distribute the weight of the object equally between your feet 3 Use a slow lifting force Never move suddenly or twist when you attempt to lift it 4 Liftit by standing or pushing up with your leg muscles this action could avoid the strain from the muscles in your back Do not attempt to lift any object that weighs more than 16 kg 35 Ib or that you think is too heavy for you Do not perform any action that causes hazards to the customer or that makes the machine unsafe Before you start the machine make sure that other service representatives and the customer are not in a hazardous positio
39. ter on laptop products The following symptoms might indicate damage caused by nonwarranted activities Missing parts might be a symptom of unauthorized service or modification If the spindle of a hard disk drive becomes noisy it may have been subjected to excessive force or dropped General checkout Power system checkout If you suspect a power problem see the appropriate one of the following power supply checkouts Checking the AC adapter on page 21 Checking the battery pack on page 22 Checking the AC adapter You are here because the computer fails only when the AC adapter is used Ifthe power on indicator does not turn on check the power cord of the AC adapter for correct continuity and installation To check the AC adapter follow the steps below 1 Unplug the AC adapter cable from the tablet 2 Measure the output voltage at the plug of the AC adapter cable See the following figure Pin Voltage V DC 1 5 2 0 TIN Note Output voltage for the AC adapter pin No 2 may differ from the one you are servicing 3 If the voltage is not correct replace the AC adapter 4 Ifthe voltage is acceptable do the following Replace the system board Ifthe problem continues go to Lenovo IdeaTab A3000 on page 24 Note Noise from the AC adapter does not always indicate a defect 21 Lenovo IdeaTab 43000 Hardware Maintenance Manual 22 Checking the
40. uter Disconnect the power cord 3 Checkthe power cord for a Athird 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 Remove the cover 6 Check for any obvious non Lenovo IdeaPad alterations Use good judgment as to the safety of any non Lenovo IdeaPad 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 Checkfor worn frayed or pinched cables 9 Check that the power supply cover fasteners screws or rivets have not been removed or tampered with a Lenovo IdeaTab 43000 Hardware Maintenance Manual 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 Notes 1 Use product specific ESD procedures when they exceed the requirements noted here 2 Make sure that the E
41. with a soft material that does not insulate you when working with live electrical currents Many customers have rubber floor mats near their machines that contain small conductive fibers to decrease electrostatic discharges Do not use such kind of mat to protect yourself from electrical shock Find the room emergency power off EPO switch disconnecting the switch or electrical outlet If an electrical accident occurs you can then operate the switch or unplug the power cord guickly Do not work alone under hazardous conditions or near the eguipment that has hazardous voltages Disconnect all power before Performing a mechanical inspection Working near power supplies Removing or installing main units 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 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
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