Instruction/ maintenance manual of the product NB255 Toshiba
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Toshiba Personal Computer NB250/NB255 Maintenance Manual TOSHIBA CORPORATION.
Copyright © 2010 by Toshiba Corporation. All rights reserved. Under the copyright laws, this manual cannot be reproduced in any form without the prior written permission of Toshiba. No patent liability is assumed with respect to the use of the inform ation contained herein.
NB250/NB255 Series Maintenance Manual iii Preface This maintenance manual describes how to perform hardware service maintenance for the Toshiba Personal Computer Satellite, referred to as the Satellite Series in this m anual.
NB250/NB255 Series Maint enance Manual iv The manual is divided into the following parts: Chapter 1 Hardware Overview describes the Satellite Series system unit and each FRU. Chapter 2 Troubleshooting Procedures explains how to diagnose and resolve FRU problems.
NB250/NB255 Series Maint enance Manual v Some operations require you to simultaneously use two or m ore keys. We identify such operations by the key top symbols separated by a plus (+) sign. For example, Ctrl + Pause (Break) means you must hold down Ctrl and at the same tim e press Pause (Break) .
NB250/NB255 Series Maint enance Manual vi Table of Contents Chapter 1 Hardware Overview 1.1 Features ............................................................................. Error! Bookmark not defined. 1.2 2.5-inch HDD ..........................
NB250/NB255 Series Maint enance Manual vii Chapter 3 Tests and Diagnostics 3.1 The Diagnostic Test ............................................................. Error! Bookmark not defined. 3.2 Executing the Diagnostic Test ...........................
NB250/NB255 Series Maintenance Manual viii Chapter 4 Replacement Procedures 4.1 General .............................................................................. Error! Bookmark not defined. Safety Precautions ....................................
NB250/NB255 Series Maint enance Manual ix Removing the Logic Upper Assembly ............................... Error! Bookmark not defined. Installing the Logic Upper Assembly ................................ Error! Bookmark not defined. 4.9 Speaker ....
NB250/NB255 Series Maint enance Manual x Figures Figure 4.1 Removing the Battery Pack ................................... Error! Bookmark not defined. Figure 4.2 Removing the HDD door ....................................... Error! Bookmark not defined.
NB250/NB255 Series Maint enance Manual xi Figure 4.31 Removing the screws from the LCD m odule ....... Error! Bookmark not defined. Figure 4.32 Removing the LCD Hinge Assembly ................... Error! Bookmark not defined. Figure 4.33 Removing the Camera from the LCD panel .
Chapter 1 Hardware Overview.
1 Hardware Overview NB250/NB255 Maint enance Manual 1-ii Chapter 1 Contents 1.1 Features .................................................................................................................. 1-1 1.2 2.5-inch HDD ..........................
1 Hardware Overview NB250/NB255 Maintenance Manual 1-iii Figures Figure 1-1A ID Parts Description Placement Part A.......................................................... 1-4 Figure 1-2 S-ATA HDD .....................................................
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1.1 Features 1 Hardware Overview NB250/NB255 Maint enance Manual 1-1 1.1 Features The Toshiba NB200 is a small-size PC notebook equipped with an Intel ® Atom TM Processor, providing high-speed processing capabilities and advanced features. The computer em ploys a lithium ion battery that allows it to be battery-operated for long periods of time.
1 Hardware Overview 1.1 Features NB250/NB255 Maint enance Manual 1-2 Graphics The computer uses Intel ® NM10 Express Chipset for integrated graphics display. Keyboard The computer is equipped with a tile or flat keyboard. It comes with 85 or 86 keys supported and with optional Windows and application keys (except for Linux models).
1.1 Features 1 Hardware Overview NB250/NB255 Maint enance Manual 1-3 Internal Microphone The computer has a built-in internal microphone equipped with echo-cancellation. Headphones/Line-out Jack This jack connects speakers or stereo headphones.
1 Hardware Overview 1.1 Features Figure 1-1A shows the computer and its system unit configuration. External monitor port Thermal vent holes USB ( USB Sleep and Charge function is supported by this port only.
1.1 Features 1 Hardware Overview A A B B C C D D E E 1 1 2 2 3 3 4 4 Titl e Siz e Docum ent Number R e v Dat e: Sh ee t o f Security Classif ication Compal Secret D ata THIS SHEET OF ENGINEERING DRAWING IS THE PROPRIETARY PROPERTY OF COMPAL ELECTRONICS, INC.
1 Hardware Overview 1.1 Features NB250/NB255 Maint enance Manual 1-6 The system unit of the computer consists of the following com ponents: Processor The computer is equipped with the following Intel ® processor: Intel ® Pineview TM Processor.
1.1 Features 1 Hardware Overview NB250/NB255 Maint enance Manual 1-7 Audio Controller Realtek Azalia ALC272 One Audio-in port: Mic-in/Line-in One Audio-out port: Headphone-out/Line-out.
1 Hardware Overview 1.2 2.5-inch HDD 1.2 2.5-inch HDD The computer contains a low-profile a nd light-weight, high-performance HDD. The HDD interface conforms to Serial ATA. Storage capacities supported are 120 and 160 GB. The HDD is shown in Figure 1-2 and some of its specifications are listed in Table 1-1.
1.3 Power Supply 1 Hardware Overview NB250/NB255 Maint enance Manual 1-9 1.3 Power Supply The power supply unit provides constant voltage (19V) for the system board and performs the following functions: 1. Power input monitor Checks whether the AC adapter (DC power supply) is connected to the computer.
1 Hardware Overview 1.3 Power Supply NB250/NB255 Maint enance Manual 1-10 6. Output monitor Monitors the voltage output to the system block (load/logic circuit side). Monitors the voltage, over voltage, input/output current of the battery pack.
1.4 Batteries 1 Hardware Overview NB250/NB255 Maint enance Manual 1-11 1.4 Batteries The computer has the following two types of batteries: Main Battery Pack Real Time Clock (RTC) Battery 1.4.1 Main Battery The main battery pack serves as the computer' s main power source when the AC adapter is not attached.
1 Hardware Overview 1.4 Batteries NB250/NB255 Maint enance Manual 1-12 NOTE: The time required for normal charge depends on the power consumption by the system. Using a fluorescent lamp and frequently accessing the disk consumes more power and lengthens the charge time.
Chapter 2 Troubleshooting Procedures 2.
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2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 1 Chapter 2 Contents 2.1 Troubleshooting Introduction ...................................................................................... 3 2.2 Troubleshooting Flowchart ...........
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 2 Figures Figure 2-1 Troubleshooting flowchart (1/2) ....................................................................... 5 Figure 2-1 Troubleshooting flowchart (2/2) ..............
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 3 2.1 Troubleshooting Introduction Chapter 2 describes how to determine if a Fi eld Replaceable Unit (FRU) in the com puter is causing the computer to malfunction. The FRUs covered are: 1.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 4 Make sure all optional equipment is removed from the com puter..
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 5 STA R T C onn ect t he A C adap t er t o t h e D C - I N sock et I s t h e DC- I N L E D o n ? I s t h e B at t ery L E D o n ? T u.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 6 A Does typed charact ers appear correctly? Insert USB memory disk. Then run the diagnostics test prog ram Is the diagnostics t est .
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 7 If the diagnostics program cannot detect an erro r, the problem may be intermittent. The test program should be executed several times to isol ate the problem. W hen a problem has been located, perform the appropriate trou bleshooting procedures as follows: 1.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 8 Other problems that are not covered by the di agnostics program may be discovered by a user. 1. If an error is detected when using an ex ternal USB device, perform the External USB Devices Troubleshooting pr ocedures in Section 2.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 9 2.3 Power Supply Troubleshooting ST AR T Are the D C - IN and B a tter y L E D s lit? Can you tur n the com puter o n? A r e th e i.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 10 as instructed. The flowchart in Figure 2-2 give s a summary of the proc ess. The procedures described in this section are: Procedu.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 11 Table 2-2 DC-IN LED DC-IN LED Power supply status Solid on AC power exists (LED is Green). Off No AC po wer exists. To check the power supply status, install a ba ttery pack and connect an A C adaptor to the DC-IN port on the computer and to a power supply.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 12 Procedure 3 Power supply connection check The power supply wiring diagram is shown below: AC adaptor Sys t e m boar d B a tte ry A C adaptor cord AC p o we r c o r d Any of the connectors may be disconnected.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 13 Procedure 4 Diagnostic check The power supply may not charge the battery pack. Perform the following procedures: 1. Reinstall the battery pack. 2. Attach the AC adaptor and turn on the power .
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 14 2.4 Display Troubleshooting Per f or m ext er nal di spl ay che ck ( P r ocedur e 1) STA R T D o es t h e ex t ernal di s pl ay f .
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 15 This section describes how to determ ine if th e computer’s display is functioning properly. The process is outlined in Figure 2-3. Start wi th Procedure 1 and continue with the other procedures as instructed.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 16 Procedure 3 Connector and replacement check The LCD module and system board are connected to the display circuits.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 17 2.5 Keyboar d Troubleshooting Per for m ext er nal keyboar d chec k ( P r ocedur e 1) STA R T D oes t he ex t ernal keyboa r d fun.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 18 To determine if the computer’s keyboard is functioning properly, perform the following procedures. Figure 2-5 outlines the p rocess. St art with Procedure 1 and continue with the other procedures as instructed.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 19 2.5 External USB Devices Troubleshooting R epl ace syst em board (P ro ce du re 2 ) EN D O r ig in a l U S B devi ce i s f aul t y.
2 Troubleshooting Procedures NB250/NB255 Series Maintenance Manual 20 To determine if the computer’s external US B devices are functioning properly, perform the following procedures. Figure 2-6 outlines the proce ss. Start with Procedure 1 and continue as instructed.
2 Troubleshooting Procedures NB200 Series Maintenance Manual 21 2.6 TouchPad Troubleshooting START END To uchP ad c onne c tio n check (Procedure 1) TouchPad replacemen t check (Procedure 2) Replace s.
2 Troubleshooting Procedures NB200 Series Maintenance Manual 22 To determine if the computer’s built-in T ouchPad is functioning properly, perform the following procedures. Figure 2-9 outlines the proce ss. Start with Procedure 1 and continue as instructed.
23 2 Troubleshooting Procedures NB200 Series Maintenance Manual 23 2.7 Speaker Troubleshooting ST A R T D o al l sour ces have s a me p r o bl e m? EN D P erfo rm e a rp ho n e test (P ro ce d u re 2 .
24 2 Troubleshooting Procedures NB200 Series Maintenance Manual 24 To determine if the computer’s built-in sp eakers are function ing pr operly, perform the following procedures. Figure 2-10 outlines the p ro cess. First adjust the speaker volume to an appropriate level.
25 2 Troubleshooting Procedures NB200 Series Maintenance Manual 25 2.6 Wireless LAN Troubleshooting STAR T Perf orm diagnost ic t est (Procedure 1) W as a w ireless LAN problem delected? Perform conn .
26 2 Troubleshooting Procedures NB200 Series Maintenance Manual 26 computer’s wireless LAN system is functioni ng properly, perform the following procedures. Figure 2-15 outlines the process. Start with Procedure 1 and continue with the other procedures as instructed.
27 2 Troubleshooting Procedures NB200 Series Maintenance Manual 27 2.7 Camera Troubleshooting Figure 2-9 Camera troubleshooting process.
28 2 Troubleshooting Procedures NB200 Series Maintenance Manual 28 The Camera board or system board may be the reason of a Cam era fault. Either of these two components may be damaged. To determine if the com puter’s Camera is functioning properly, perform the following procedures.
29 2 Troubleshooting Procedures NB200 Series Maintenance Manual 29 2.8 Bluetooth Troubl eshooting Figure 2-10 Bluetooth troubleshooting process.
30 2 Troubleshooting Procedures NB200 Series Maintenance Manual 30 The Bluetooth antenna wire, Bluetooth module or system board may be the reason of a Bluetooth fault. Any of these components may be dam aged. To determine if the computer’s Bluetooth is functioning properl y, perform the following proce dures.
31 2 Troubleshooting Procedures NB200 Series Maintenance Manual 31 Check 4 The system board may be dam aged. Replace it with a new one following the instructions in Chapter 4.
32 2 Troubleshooting Procedures NB200 Series Maintenance Manual 32 This section describes how to determine if the 2 IN 1 Card is functioning properly. The process is summarized in Figure 2-16. Perform the steps below starting with Procedure 1 and continuing with the other procedures as required.
33 2 Troubleshooting Procedures NB200 Series Maintenance Manual 33 2.10 HDD/SSD Troubleshooting Figure 2-12 HDD troubleshooting process.
34 2 Troubleshooting Procedures NB200 Series Maintenance Manual 34 The HDD or system board may be the reason of a HDD fault. Either of these two components may be damaged. To determine if the comput er’s HDD is functioning properly, perform the following procedures.
35 2 Troubleshooting Procedures NB200 Series Maintenance Manual 35.
36 2 Troubleshooting Procedures NB200 Series Maintenance Manual 36 2.13 CRT Troubleshooting P e rfo rm C R T c o n n e c ti o n ch eck ( P r o ced u r e 1 ) ST A R T D o es r ep l acem en t CRT c a b .
37 2 Troubleshooting Procedures NB200 Series Maintenance Manual 37 Procedure 1: CRT connection check Procedure 2: CRT set check Procedure 1 CRT connection check The CRT cable may be damaged or the conne ctions may be loose. Perform Check 1: Check 1 Make sure CRT cable is firmly pl ugged into both the CRT set and the CRT port of the computer.
38 2 Troubleshooting Procedures NB200 Series Maintenance Manual 38 2.14 LAN Troubleshooting P e rfo rm L A N c o n n e c t i o n ch eck ( P r o ced u r e 1 ) ST A R T D o es r ep l acem en t L AN c a .
39 2 Troubleshooting Procedures NB200 Series Maintenance Manual 39 Procedure 1: LAN connection check Procedure 2: LAN set check Procedure 1 LAN connection check The LAN cable may be damaged or the conne ctions m ay be loose. Perform Check 1: Check 1 Make sure LAN cable is firmly pl ugged into both the LAN set and the LAN port of the computer.
40 2 Troubleshooting Procedures NB200 Series Maintenance Manual 40 Figure 2.15. MIC troubleshooting process The MIC line or system board may be the re ason of a MIC fault. Either of these two components may be damaged. To determine if the computer’s MIC is functioning properly, perform the following pr ocedures.
41 2 Troubleshooting Procedures NB200 Series Maintenance Manual 41 Procedure 2: Connector and replacement check Procedure 1 Diagnostic test Run the functioning Program on W indows model, which will display the MIC test result. If tests and diagnostics result abnormal go to Pr ocedure 2.
42 2 Troubleshooting Procedures NB200 Series Maintenance Manual 42 Figure 2.16. 3D sensor troubleshooting process The operation or system board may be the reason of 3D sensor fault. Either of these two may be damaged. To determine if the compute r’s 3D is functioning properly, perform the following procedures.
43 2 Troubleshooting Procedures NB200 Series Maintenance Manual 43 Procedure 2 Replacement check Disassemble the computer following the steps described in Chapter 4, Replacement Procedures , and perform the following checks. Check 1 Make sure that 3D sensor te st operation is correct, go to Check 2.
44 2 Troubleshooting Procedures NB200 Series Maintenance Manual 44 2. 17 3G Troubleshooting STAR T Per fo rm di agnost i c t est ( Proce dur e 1) W as a 3G problem det ect ed? Perf orm connect or and r eplacem ent check ( Proce dur e 2) R epl ace 3G ant enna/ uni t R epl ace syst em board END Ye s 3G sy stem is no t faul ty.
45 2 Troubleshooting Procedures NB200 Series Maintenance Manual 45 Procedure 1: Diagnostic test Procedure 2: Connector and replacement check Procedure 1 Diagnostic test Run the Diagnostic Program, which will autom atically execute the 3G test. Test and Diagnostic for more inform ation on the program.
3. Tests and Diagnostics 1 Chapter 3 Tests and Diagnostics.
3. Tests and Diagnostics 2 Contents 3.1 The Diagnostic Test ........................................................................................................ .... 3 3.2 Executing the Diagnostic Test..............................................
3. Tests and Diagnostics 3 3.1 The Diagnostic Test This chapter explains how to use the Test & Diagnostic program to test the functions of the (Base on Buffalo 10A/10B/10C/10BL T&D version 1.3) hardware modules. The Test & Diagnostic Program is stored on the T&D diskettes.
3. Tests and Diagnostics 4 3.2 Executing the Diagnostic Test DOS is required to run the DIAGNOSTICS PROGRAM. To start the DIAGNOSTIC PROGRAM, follow these steps: Insert the diagnostics USB disk drive and turn on the computer. (The diagnostics diskette contains the DOS boot files.
3. Tests and Diagnostics The below display will show up at the beginning of T&D program If the test result passes, the following display will show up: 5.
3. Tests and Diagnostics If an error is detected and a test fails, the following message displays: Then press any key for next actions – the below display presented if copying test log file onto diskette is necessary. This action will be executed when “ Y ” key pressed.
3. Tests and Diagnostics It will skip this process if “N” key pressed. And then it will check if it’s necessary to leave this program. Program will quit when “ Y ” key pressed and it will go back main menu f or next test if “ N ” key pressed.
3. Tests and Diagnostics 3.3 Display Configuration This Item will show the unit configuration. It includes: CPU (CPU type) DDRAM SIZE Panel ID HDD1 type & capacity (Vendor ID.
3 Tests and Diagnostics 3.4 Audio sound test The audio sound test allows the user to aurally confirm the speaker functions. And the speaker will send out music during test. NOTE : Remember to tune up the volume as “ Maximum ” before this test starts.
3. Tests and Diagnostics The computer will let the fan be “ON” after any key pressed. Feel the wind or listen the rotating sound to check whether the fan is working or not. NOTE : Remember to approach fan outlet that is near right side of unit whether fan is “ON”.
3. Tests and Diagnostics 3.6 Main Battery Charge Test NOTE : The AC adaptor should be connected to successfully run this test . 30W with 19V DC for ALL SKU This test shows and measures the main batter.
3. Tests and Diagnostics 3.7 Main Battery Change Test 3. 7 FDD Test NOTE : Before running the FDD test, prepare a formatted work diskette (1.44 MB). Need to insert FDD when power on machine. Otherwise the Floppy can be not detected. The Floppy Disk Test includes three subtests of the: 1.
3. Tests and Diagnostics 13.
3 Tests and Diagnostics 3.8 Memory check This test will check if the computer’s Mem ory Frequency and Size is correct in every slot. Before Memory test start, you should choice the below item: 1. Memory Read test 2. Memory Write test 3. Memory Read & Write test 4.
3. Tests and Diagnostics The keyboard test checks the all keys function. NOTE: The Num Lock and the Overlay mode must be off to execute the keyboard test. Before keyboard test starts, the keyboard matrix code should be chosen as below display: 1. S (US, for America) 2.
3 Tests and Diagnostics Japan keyboard UK keyboard 16.
3. Tests and Diagnostics NOTE: The “ Fn ” key cannot be tested in the keyboard test. To determine whether the “ Fn ” key is working correctly, press “ Fn+F6 ” or “ Fn + F7 ” keys to check if LCD display brightness change gradually.
3. Tests and Diagnostics The Touch Pad button subtest allows users to test their Touch Pad buttons. If the buttons are clicked, the cursors should appear in the corresponding box of the button figure that is displayed on the screen as below.
3. Tests and Diagnostics 640*480 (2/16/256 colors), 800*600 (256 colors) and 1024*768 (256 colors). The screen should display as below, indicating whether the test is passed or failed after the question. 3.12 Magnetic Switch Test The Magnetic switch test checks the Magnetic function of the unit.
3. Tests and Diagnostics 2>. If the Magnetic switch test pass, it will show below display: 20.
3. Tests and Diagnostics 3.13 LAN Test The LAN test checks the LAN full-duplex environment. NOTE: LAN loopback needs to plug in before test begins. And LAN information will show on the test screen: IO Base – Port: A000H IRQ – BH, it’s “IRQ B”.
3. Tests and Diagnostics The LAN test includes three subtests of the: 1. Speed1000 2. Speed100 3. Speed10 The subtests run automatically. The screen should display as below, indicating whether the subtests pass or fail when finished.
3. Tests and Diagnostics If an error is detected and a test fails, the following message displays: 23.
3. Tests and Diagnostics 3.14 RTC Test Checks the computer’s RTC (Real Time Clock) and calendar functions by com paring the DOS and CMOS values. The test runs automatically. The screen should display as below, indicating whether the test is passed or failed when finished.
3. Tests and Diagnostics 3.15 3D G-sensor test NOTE : please keep 90 degree between logic upper and LCD panel when test The display of a test program and the set method of PC are shown below. Display of a Test Program,The portion whic h PC and Test-Fixture contact is green.
3. Tests and Diagnostics Set method of PC <4> Front U pp e r Test 5: Set method of PC <5> U pp e r Left Test Result A test result is displayed when a test is completed. A display of result is O.K. or NG. And an error flag is returned at the end of a program.
3. Tests and Diagnostics If the picture shows as below, it means the 3D G-sensor function is NG 27.
3. Tests and Diagnostics 3.16 1 st HDD Test The HDD test allows the user to verify the 1 st HDD ok or not. First, please select HDD test method, Screen would display as below: After you select the met.
3. Tests and Diagnostics If input password is wrong, the screen would display as below: The screen will display as below picture to show the subtest is passed or failed when finished: If it is show th.
3. Tests and Diagnostics If the picture shows as below, it means he HDD function is NG 3.17 Read DMI Compal write Toshiba Part No (version), Toshiba Serial No (Serial No), Product Name, OEM string and.
3. Tests and Diagnostics 3.18 Write DMI When you want to write DMI data, please select which data you want to write, the figure below will be displayed: 1.
3. Tests and Diagnostics After write OK, you should reboot the system that can make the setting effective, or you can write next data before reboot system, the figure below will displayed: 32.
3. Tests and Diagnostics NOTE : should input correct DMI data, and should reboot the system that can make the setting effective. 3.19 Toshiba Logo set Set the computer’s Toshiba Logo for other region except Japan SKU. The screen should display as below, indicating whether the test is passed or failed when finished.
3. Tests and Diagnostics Press any key continue to auto set, if write OK, the following message displays: When Toshiba Logo set finish, please restart machine, when show below Logo: 34.
3. Tests and Diagnostics If an error is detected and a test fails, the following message displays: 3.20 Dynabook Logo set Set the computer’s Dynabook Logo for Japan SKU.
3. Tests and Diagnostics The screen should display as below, indicating whether the test is passed or failed when finished. Press any key continue to auto set, if write OK, the following message displ.
3. Tests and Diagnostics If an error is detected and a test fails, the following message displays: 37.
3. Tests and Diagnostics 3.21 TP TYPE R/W TEST This T/P TYPE R/W test checks the computer’s T/P TYPE and users write T/P vendor ID into EEPROM The test runs automatically. The screen should display as below, indicating whether the test is passed or failed when finished.
3. Tests and Diagnostics If write T/P type fail, the screen would display as below If read T/P type fail, the screen would display as below 39.
3. Tests and Diagnostics If W/R T/P type passes, the screen would display as below 40.
3. Tests and Diagnostics 3.22 EEPROM Setting This EE-PROM SETTING will set the computer’s function status into EEPROM, included supported function and no support function. NOTE : Should perform EE-PROM SETTING once change M/B. It defined as normal rule.
3. Tests and Diagnostics If this unit has MIC function, press “Y” then program will set MIC enable automatically as below: If this unit has no MIC function, press “N” then program will set MIC.
3. Tests and Diagnostics If press “7” to disable all no support function, program will perform autom atically as below: 43.
3. Tests and Diagnostics 44.
3. Tests and Diagnostics Then press any key to go back to EE-PROM SETTING option as below: If press “9” program will go back to test title as below: 45.
3. Tests and Diagnostics 46.
Chapter 4 Replacement Procedures.
4 Replacement Procedures NB250/NB255 Maint enance Manual 4-ii Chapter 4 Contents 4.1 General ................................................................................................................... 4-1 Safety Precautions ...................
4 Replacement Procedures NB250/NB255 Maint enance Manual 4-iii Installing the Power Board ........................................................................... 4-22 4.8 Logic Upper Assembly........................................................
4 Replacement Procedures NB250/NB255 Maint enance Manual 4-iv Figures Figure 4.1 Removing the Battery Pack .................................................................................. 4-8 Figure 4.2 Removing the HDD door.........................
4 Replacement Procedures NB250/NB255 Maint enance Manual 4-v Figure 4.32 Removing the LCD Hinge Assembly ............................................................... 4-42 Figure 4.33 Removing the Camera from the LCD panel ..........................
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4.1 General 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-1 4.1 General This chapter explains how to disassemble the laptop and replace Field Replaceable Units (FRUs). Some replacement procedures m ay not require you to remove all the surrounding FRUs to replace only one FRU.
4 Replacement Procedures 4.1 General NB250/NB255 Maint enance Manual 4-2 Safety Precautions Before you begin disassembly read the following safety precautions carefully. Be sure to follow them while you are working. DANGER: 1. Always use the original batteries or replacement batteries authorized by Toshiba.
4.1 General 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-3 CAUTION: 1. Before replacing a component, make sure that the replacement component meets the required specifications. To avoid laptop failures, never use components that do not meet the specifications.
4 Replacement Procedures 4.1 General NB250/NB255 Maint enance Manual 4-4 Before You Begin Before you begin to disassemble the laptop, keep in mind the precautions and advice in this section. Always begin disassembly by removing the AC adapter and battery pack.
4.1 General 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-5 Disassembly Procedures The cable connectors come in these two basic types: Pressure plate connectors Normal pin connect.
4 Replacement Procedures 4.1 General NB250/NB255 Maint enance Manual 4-6 Tools and Equipment For your safety and that of other people in the working environment, it is strongly recomm ended that you use electrostatic discharge (ESD) equipment.
4.1 General 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-7 Colors of Screw Shanks For easy identification of the correct screws, the screw shanks are colored according to their lengths, .
4 Replacement Procedures 4.2 Battery NB250/NB255 Maint enance Manual 4-8 4.2 Battery Removing the Battery Pack Remove the battery pack according to the following procedures and Figure 4.1. CAUTION: When handling the battery packs, use care not to short circuit the terminals.
4.2 Battery 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-9 Installing the Battery Pack Install the battery pack according to the following procedures. CAUTION: The battery packs contain a lithium ion battery, which can explode due to improper replacement, use, handling, or disposal.
4 Replacement Procedures 4.3 HDD NB250/NB255 Maint enance Manual 4-10 4.3 HDD Removing the HDD CAUTION: Do not press on the top or bottom of the drive. Applying such pressure can either corrupt the data in the drive or damage the drive. Remove the HDD (hard disk drive) according to the following procedures and Figure 4.
4.3 HDD 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-11 2. Slide the HDD pack horizontally to disconnect it from HDD connector. 3. Lift up and remove the HDD pack from HDD bay as shown in Figure 4.3. Figure 4.3 Removing the HDD from the HDD bay NOTE: Do not disassemble the HDD pack when it is working normally.
4 Replacement Procedures 4.3 HDD NB250/NB255 Maint enance Manual 4-12 5. To separate the plate from the HDD, remove four M3x3 screws as shown in Figure 4.4. Figure 4.4 Removing the HDD plate CAUTION: Do not apply pressure to the top or bottom of the drive.
4.4 Memory 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-13 4.4 Memory Removing the Optional Memory Remove the optional mem ory according to the following procedures and Figure 4.5 and 4.6 after checking that the laptop is turned off. CAUTION: Remove the optional memory after turning off the laptop.
4 Replacement Procedures 4.4 Memory NB250/NB255 Maint enance Manual 4-14 4. Spread out the two memory lock latches so that the m emory pops up. Please follow the procedure as shown in Figure 4.6. Figure 4.6 Removing the RAM from the laptop 5. Pull the memory up and out at an angle, using care to avoid touching the connectors.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-15 4.5 WLAN Card Removing the WLAN Card Remove the WLAN card according to the following procedures and Figure 4.7. 1. Detach the two antennas on the WLAN card. 2. Remove two M2x3 screws that secure the WLAN card as shown in Figure 4.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-16 Installing the WLAN Card Install the WLAN card according to the following procedures. 1. Insert the WLAN card into the connector. 2. Press the card down and secure it with two M2x3 screws.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-17 4.6 Hinge Cover and Keyboard Remove the Hinge Cover and Keyboard according to the following procedures and Figure 4.8, 4.9 and 4.10. 1. Remove the following twelve screws as shown in Figure 4.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-18 Removing the Hinge Cover Remove the hinge cover according to the following procedures. 1. Use your fingers to unclasp three hinge cap hooks as indicated in Figure 4.9. Figure 4.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-19 Removing the Keyboard Remove the Keyboard according to the following procedures and Figure 4.11. 1. Open the laptop. 2. Unfasten the four hooks on the sides of the logic upper assembly.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-20 Installing the Hinge Cover and Keyboard Install the hinge cover and keyboard according to the following procedures. 1. Attach the cable from the underside of the keyboard to the connector on the logic upper assembly.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-21 4.7 Power Board Removing the Power Board Remove the power board according to the following procedures and Figure 4.12. 1. Use tweezers to release the latches on the left and right sides of the connector by pushing in the direction of the arrows in Figure 4.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-22 Installing the Power Board Install the power board according to the following procedures. 1. Seat the power board in the correct position on the logic upper assembly. 2. Slide the power board to the end of the track until the latch clicks into place.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-23 4.8 Logic Upper Assembly Removing the Logic Upper Assembly Remove the logic upper assembly according to the following procedures and Figure 4.13, 4.14, 4.15, 4.16 and 4.17. 1.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-24 2. Remove any tape and then gently free the camera cable, m icrophone cable and antennas from their trough as indicated in Figure 4.14. Figure 4.14 Freeing cables and antennas from the logic upper assembly 3.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-25 5. Close the laptop. Remove two M2.5x6 screws from the hinge saddle as shown in Figure 4.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-26 6. Open the laptop and remove two M2.5x6 screws from the hinge saddle as shown in Figure 4.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-27 7. Remove the LCD display assembly from the logic assembly. 8. Detach the Touch Pad cable and the Thermal Fan cable as shown in Figure 4.17. (Detach the touch pad cable by using tweezers to push the left and right latches of the connector in the direction of the arrow.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-28 5. Close the laptop and secure two M2.5x6 screws as indicated in Figure 4.15.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-29 4.9 Speaker Removing the Speaker Remove the Speaker according to the following procedures and Figure 4.18. 1. Remove two M2.5x7.7 screws as shown in Figure 4.18. 2. Detach the speaker cable from the motherboard and rem ove the speaker from the logic lower assembly.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-30 4.10 Touch Pad Removing the touch pad bracket Remove the touch pad bracket according to the following procedures and Figure 4.19. 1. Remove two M2.5x2.5 screws from the touch pad bracket as shown in Figure 4.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-31 4.11 Motherboard Removing the Motherboard Remove the motherboard according to the following procedures and Figure 4.20, 4.21, 4.22 and 4.23. 1. Remove two M2.5x4 screws and FAN cable from the m otherboard as indicated by the arrow in Figure 4.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-32 2. Remove the plate from the logic lower assem bly. Figure 4.21 Removing the DC IN plate 3. Gently pull the cable out of the routing channel in the logic lower assembly from right to left, as shown in Figure 4.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-33 4. Use your hands to pick up the motherboard in the direction of the arrows as shown in figure 4.23. Figure 4.23 Picking up the motherboard 5. Remove the motherboard from the logic lower assembly.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-34 Installing the Motherboard Install the motherboard according to the following procedures and Figures 4.24 and 4.25. 1. Before seat the motherboard on the logic lower assembly, pull out the any cables to avoid them being pressed.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-35 4. Put the DC IN connector in the lower DC IN trough and route the cable from left to right under the ribs as shown in Figure 4.25. Fasten with tape. Figure 4.25 Installing the DC IN connector 5.
4 Replacement Procedures 4.5 WLAN Card NB250/NB255 Maint enance Manual 4-36 4.12 Thermal Fan Module Removing the Thermal Fan Module Remove the thermal fan m odule according to the following procedures and Figures 4.26 and 4.27. CAUTION: When removing the thermal fan module, keep the following in mind: 1.
4.5 WLAN Card 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-37 Installing the Thermal Fan Module Install the Thermal Fan Module according to the following procedures and Figure 4.27. 1. Apply a new thermal pad on the thermal fan m odule as shown in Figure 4.
4 Replacement Procedures 4.13 LCD Bezel Assembly NB250/NB255 Maint enance Manual 4-38 4.13 LCD Bezel Assembly Removing the LCD Bezel Assembly Remove the LCD bezel assembly according to the following procedures and Figures 4.28, 4.29 and 4.30. 1. Remove the two mask seals that cover the screws.
4.13 LCD Bezel Assembly 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-39 3. Remove the bezel from each side of the hinge wall in the order shown in Figure 4.29. NOTE: The sides of the bezel are secured tightly. Remove slowly and take extra caution to prevent your nails from becoming broken or from scratching the LCD surface.
4 Replacement Procedures 4.13 LCD Bezel Assembly NB250/NB255 Maint enance Manual 4-40 Installing the LCD Bezel Assembly Install the LCD bezel assembly according to the following procedures. NOTE: Take extra care in routing cables and antennas on the LCD module.
4.14 LCD Module 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-41 4.14 LCD Module Removing the LCD Module Remove the LCD module according to the following procedures and Figures 4.31 and 4.32. 1. Remove four M2.5x4 screws securing the LCD module to the LCD cover assem bly.
4 Replacement Procedures 4.14 LCD Module NB250/NB255 Maint enance Manual 4-42 4. Remove four M2x3 screws that secure the LCD hinge assembly to the LCD panel and then remove the LCD hinge assembly, as shown in Figure 4.32. Figure 4.32 Removing the LCD Hinge Assembly NOTE: Integrated Circuits (ICs) are fragile.
4.14 LCD Module 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-43 Installing the LCD Module Install the LCD module according to the following procedures. 1. Seat the LCD hinges in the correct positions on the LCD panel and secure them with four M2x3 screws.
4 Replacement Procedures 4.15 Camera module LVDS cable NB250/NB255 Maint enance Manual 4-44 4.15 Camera module LVDS cable Removing the Camera module and LVDS Cable Remove the Camera m odule and LVDS cable according to the following procedures and Figures 4.
4.15 Camera module LVDS cable 4 Replacement Procedures NB250/NB255 Maint enance Manual 4-45 3. Carefully peel up the LVDS cable, starting from the top, as shown in Figure 4.34. Once the LVDS cable has been peeled up disconnect it from the LCD panel, taking care not to damage the connector.
4 Replacement Procedures 4.15 Camera module LVDS cable NB250/NB255 Maint enance Manual 4-46 Installing the Camera module and LVDS Cable Install the camera module and LVDS cable according to the following procedures. NOTE: Take extra care in routing cables and antennas on the LCD module.
Appendix A Appendix A Handling the LCD Module Precautions for handling the LCD module The LCD module can be easily damaged during assem bly or disassembly.
3. If the panel’s surface gets dirty or moist, wipe it with cotton or a soft cloth. If it is still dirty, try breathing on the surface to create a light condensate and wipe it again. If the surface is very dirty, we recommend a CRT cleaning agent. Apply the agent to a soft cloth and then wipe the panel’s surface.
5. Glass is used in the panel, so be careful not to drop it or let it strike a hard object, which could cause breakage or cracks. 6. CMOS-LSI circuits are used in the module, so guard against damage from electrostatic discharge. Be sure to wear a wrist or ankle grounding device when handling the module.
7. Do not expose the module to direct sunlight or strong ultraviolet rays for long periods. 8. Do not store the module at temperatures below its specifications. Cold can cause the liquid crystals to freeze, lose their elasticity or otherwise suffer damage.
10. If you transport the module, do not use packing material that contains epoxy resin (am ine) or silicon glue (alcohol or oxime). These materials can release gas that can dam age the panel’s polarization.
Appendix B Appendix B Board Layout B.1 System Board T op V iew JLVDS JPOWER JMIC JKB U35 U36 U4 JCARD JFAN JTOUCH U29 JSPKR Figure B-1 System Board Layout (Top) NB250/NB255 Series Maint enance Manual .
B.2 System Board Bottom V iew Figure B-2 System Board Layout (Bottom) JWLAN UL3 UL1 UC1 U15 JLAN JLINE JEXMIC JCRT U2 PJP2 UA2 JDDR1 JSATA PJP1 U1 JUSBC JUSBB JUSBA B-2 [CONFIDENTIAL] NB250/NB255 Seri.
Table B-1 System Board ICs (top and bottom) Number Name U1 Intel Atom_ U2 Thermal Sensor_EMC1402 U4 Clock Generator_RTM875N-397-GR U15 South Bridge_Intel NM10 U29 EC_KB926QFE0 U35 FAN Control IC_APL56.
B-4 [CONFIDENTIAL] NB250/NB255 Series Maint enance Manual Number Name JLVDS LVDS conn. JFAN Fan conn. JDDR1 DDRIII conn. JCRT CRT conn. JPOWER Power/B conn. JSATA SATA HDD conn. JCARD Card Reader conn. JMIC Microphone conn. JSPKR Speaker conn. JLAN LAN conn.
C. Appendix C Pin Assignments System Board C.1 JF AN Table C-1 FAN I/F pin assignments (3-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 +FAN1 2 FAN_SPEED1 3 GND C.2 JL VDS Table C-2 LVDS I/F pin assignments (20-pin) Pin No. Signal name I/O Pin No.
C.3 JCRT Table C-3 CRT pin assignments (15-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 CRT_R_L 2 CRT_G_L 3 CRT_B_L 4 NC 5 GND 6 GND 7 GND 8 GND 9 +CRT_VCC 10 GND 11 NC 12 CRT_DDC_DAT 13 HSYNC 14 VSYNC 15 CRT_DDC_CLK C.4 JSA T A Table C-4 HDD I/F pin assignments (22-pin) Pin No.
C.5 JWLAN Table C-5 WLAN/WiMax Connector pin assignments (52-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 NC 2 +3V_WLAN 3 WLAN_BT_DATA 4 GND 5 WLAN_BT_CLK 6 +1.
C.6 JLAN Table C-6 LAN Connector pin assignments (12-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 RJ45_MIDI0+ I/O 2 RJ45_MIDI0- I/O 3 RJ45_MIDI1+ I/O 4 NC 5 NC 6 RJ45_MIDI1- I/O 7 NC 8 NC 9 .
C.7 JDDR1 Table C-7 SODIMM I/F pin assignments (204-PIN) (1/4) Pin No. Signal name I/O Pin No. Signal Name I/O 1 +DIMM_VREF 2 GND 3 GND 4 DDR_A_D4 5 DDR_A_D0 6 DDR_A_D5 7 DDR_A_D1 8 GND 9 GND 10 DDR_A.
Table C-7 SODIMM I/F pin assignments (204-PIN) (2/4) Pin No. Signal name I/O Pin No. Signal Name I/O 33 DDR_A_D10 34 DDR_A_D14 35 DDR_A_D11 36 DDR_A_D15 37 GND 38 GND 39 DDR_A_D16 40 DDR_A_D20 41 DDR_.
Table C-7 SODIMM I/F pin assignments (204-PIN) (3/4) Pin No. Signal name I/O Pin No. Signal Name I/O 97 DDR_A_MA1 98 DDR_A_MA0 99 +1.5V 100 +1.5V 101 M_CLK_DDR0 102 M_CLK_DDR1 103 M_CLK_DDR#0 104 M_CLK_DDR#1 105 +1.5V 106 +1.5V 107 DDR_A_MA10 108 DDR_A_BS1 109 DDR_A_BS0 110 DDR_A_RAS# 111 +1.
159 DDR_A_D43 160 DDR_A_D47 Table C-7 SODIMM I/F pin assignments (204-PIN) (4/4) Pin No. Signal name I/O Pin No. Signal Name I/O 161 GND 162 GND 163 DDR_A_D48 164 DDR_A_D52 165 DDR_A_D49 166 DDR_A_D53.
C.8 JMIC Table C-8 Internal Microphone Connector pin assignments (2-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 INT_MIC 2 AGND C.9 JLINE Table C-9 HEADPHONE Connector pin assignments (6-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 AGND 2 HP_L_R 3 HP_R_R 4 NBA_PLUG 5 AGND 6 NC C.
31 NC 32 NC 33 NC 34 NC C.11 JUSBA Table C-11 USB Connector pin assignments (4-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 +USB_VCCA 2 USB20_N0_R 3 USB20_P0_R 4 GND C.12 JUSBB Table C-12 USB/B Connector pin assignments (4-pin) Pin No. Signal name I/O Pin No.
C.15 JCARD Table C-15 CARD READER connector pin assignments (11-pin) Pin No. Signal name I/O Pin No. Signal Name I/O 1 SD_DATA3 2 SDCMD 3 GND 4 +VCC_3IN1 5 SDCLK 6 GND 7 SD_MS_DATA0 8 SD_DATA1 9 SD_DATA2 10 SDWP# 11 SDCD# C.16 JEXMIC Table C-16 EXMIC connector pin assignments (6-pin) Pin No.
C-12 [CONFIDENTIAL] NB250/NB255 Series Maint enance Manual C.18 JT OUCH Table C-18 T/P connector pin assignments (6-pin) Pin No. Signal name I/O Pin No.
Appendix D Appendix D Keyboard Scan/Character Codes Table D-1 Scan codes (set 1 and set 2) (1/4) Code set 1 Code set 2 Cap No. Keytop Make Break Make Break Note 01 ‘ ~ 29 A9 0E F0 0E 02 1 ! 02 82 16.
Table D-1 Scan codes (set 1 and set 2) (2/4) Code set 1 Code set 2 Cap No. Keytop Make Break Make Break Note 29 | 2B AB 5D F0 5D *5 30 Caps Lock 3A BA 58 F0 58 31 A 1E 9E 1C F0 1C 32 S 1F 9F 1B F0 1B.
Table D-1 Scan codes (set 1 and set 2) (3/4) Code set 1 Code set 2 Cap No. Keytop Make Break Make Break Note 58 Ctrl(L) 1D 9D 14 F0 14 *3 60 Alt (L) 38 B8 11 F0 11 *3 61 Space 39 B9 29 F0 29 62 ALT (R.
Table D-1 Scan codes (set 1 and set 2) (4/4) Code set 1 Code set 2 Cap No. Keytop Make Break Make Break Note 122 F11 57 D7 78 F0 78 *3 123 F12 58 D8 07 F0 07 *3 124 PrintSc *6 *6 *6 *6 *6 X Fn — — — — *4 X Win E0 5B E0 DB E0 1F E0 F0 1F x App E0 5D E0 DD E0 2F E0 F0 2F Notes: 1.
Table D-2 Scan codes with left Shift key Code set 1 Code set 2 Cap No. Key top Make Break Make Break 55 / E0 AA E0 35 E0 B5 E0 2A E0 F0 12 E0 4A E0 F0 4A E0 12 75 INS E0 AA E0 52 E0 D2 E0 2A E0 F0 12 .
Table D-3 Scan codes in Numlock mode Code set 1 Code set 2 Cap No. Key top Make Break Make Break 75 INS E0 2A E0 52 E0 D2 E0 AA E0 12 E0 70 E0 F0 70 E0 F0 12 76 DEL E0 2A E0 53 E0 D3 E0 AA E0 12 E0 71.
Table D-5 Scan codes in overlay mode Code set 1 Code set 2 Cap No. Keytop Make Break Make Break 09 8 (8) 48 C8 75 F0 75 10 9 (9) 49 C9 7D F0 7D 11 0 (*) 37 B7 7C F0 7C 23 U (4) 4B CB 6B F0 6B 24 I (5).
D-8 [CONFIDENTIAL] NB250/NB255 Series Maintenance Manual Table D-7 No.126 key scan code Code set 1 Code set 2 Key top Shift Make Make Pause Common E1 1D 45 E1 9D C5 E1 14 77 E1 F0 14 F0 77 Break Common E0 46 E0 C6 E0 7E E0 F0 7E *: This key generates only make codes.
Appendix E Key Layout 1. United Status (US) K eyboard Figure US keyboard 2. T raditional Chinese (CH) K eyboard Figur e CH keyboard NB250/NB2 55 Series Mainte nance Manu al.
3. Thai (TI) K eyboard Figur e TI keyboar d 4 . Ko r e a n ( KO ) Key b o a r d Figur e KO keyboard NB250/NB2 55 Series Mainte nance Manu al.
5. United Kingdom (UK) K eyboard Figur e UK keyboard 6. US International (UI) K eyboard NB250/NB2 55 Series Mainte nance Manu al.
Figur e UI keyboard 7. Hebrew (HB) K eyboard Figur e HB keyboard 8. Danish (DM) K eyboard NB250/NB2 55 Series Mainte nance Manu al.
Figur e DM keyboard 9. Swiss (S W) Ke yboard Figur e SW keyboar d NB250/NB2 55 Series Mainte nance Manu al.
10. Arabic (ARE) K eyboard Figur e ARE keyboar d 11. Czec h (CZ) K eyboard Figur e CZ keyboard NB250/NB2 55 Series Mainte nance Manu al.
NB250/NB2 55 Series Mainte nance Manu al 2. Russian (RU) K eyboard 1 Figur e RU keyboard 3. P or tuguese (PO) K eyboard 1 Figur e PO keyboard.
NB250/NB2 55 Series Mainte nance Manu al 4. Slo vakian (SL) K eyboard 1 Figur e SL keyboar d 5. It alian (IT) K eyboard 1 Figur e IT keyboar d.
NB250/NB2 55 Series Mainte nance Manu al 16. French (FR) K eyboard Figur e FR keyboard 17. German (GR) K e yboard Figur e GR keyboard.
NB250/NB2 55 Series Mainte nance Manu al 18. Greek (GK) Ke yboard Figur e GK keyboard 19. Hungarian (HG) Ke yboard.
NB250/NB2 55 Series Mainte nance Manu al Figur e HG keyboard 20. Spanish (SP) Ke yboard Figur e SP keyboar d 21. T urkish (TR) K eyboard.
Figur e TR keyboar d 22. T urkish F (TF-F) Ke yboard Figur e TF-F keyboard NB250/NB2 55 Series Mainte nance Manu al.
23. Swedish (SD) K eyboard Figur e SD keyboard 24. Belgian (BE) K eyboard Figur e BE keyboard NB250/NB2 55 Series Mainte nance Manu al.
25. Y ugoslavian (YU) K eyboard Figur e YU keyboard 26. Nor wegian (NW) K eyboard Figur e NW keyboar d NB250/NB2 55 Series Mainte nance Manu al.
2 7 . Scandinavian (ND) K eyboard Figur e ND keyboard 28. Canadian Multinational (A C) Ke yboard NB250/NB2 55 Series Mainte nance Manu al.
Figur e AC keyboar d 29. Canadian Bilingu al (CB) K eyboard Figur e CB keyboard 30. R omania (R O) K eyboard NB250/NB2 55 Series Mainte nance Manu al.
NB250/NB2 55 Series Mainte nance Manu al Figur e RO keyboard 31 . Bulgaria (BU) K eyboard Figur e BU keyboard 32. Japanese (JP) K eyboard.
Figur e JP keyboar d NB250/NB2 55 Series Mainte nance Manu al.
NB250/NB255 Series Maintenance Ma n ual [CONFIDENTIAL] F-1 F. Appendix F Series Screw Torque List (PAV10) Table F-1 Series Screw Torque List SCREW P/N SCREW SPEC Q'ty LOCATION SCREW TORQUE LCD ASSY MAAA00153G0 M2x3.0 (Black ) 4 LCD HINGE BRK ASSY L&R TO LCD PANEL 17W" 1.
F-2 [CONFIDENTIAL ] NB250 Series Maintenance Manual LOGIC & LCD ASSY MA0000062G0 M2.5x6 (Black) 4 HINGE BRACKET TO LOGIC 2.0~2.5Kgf.cm MACK25040G0 M2.
Appendix G Appendix G Reliability The followin g table shows MT BF (Mean Tim e Between Failures) for each com ponent. Table G-1 MTBF Component Time (hours) LCD 10,000 Keyboard 64400 HDD 300,000 Optica.
An important point after buying a device Toshiba NB255 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Toshiba NB255 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Toshiba NB255 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Toshiba NB255 you will learn all the available features of the product, as well as information on its operation. The information that you get Toshiba NB255 will certainly help you make a decision on the purchase.
If you already are a holder of Toshiba NB255, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Toshiba NB255.
However, one of the most important roles played by the user manual is to help in solving problems with Toshiba NB255. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Toshiba NB255 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
