Shows the front of the computer | Toshiba A3X manual

1 Hardware Overview		1.1 Features
Figure 1-1 shows the front of the computer.

Figure 1-1 Front of the computer

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[CONFIDENTIAL]

Satellite A50S/TECRA A3X Maintenance Manual (960-534)

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Toshiba A3X manual Shows the front of the computer

Contents

Toshiba Corporation File Number Copyright Safety Precautions Preface Confidential Conventions Acronyms Table of Contents Chapter Tests and Diagnostics Only ONE Test Chapter Appendices Confidential Confidential Hardware Overview Hardware Overview Chapter Contents Figures Tables Time required for charges of RTC battery Hardware Overview Features Features Hardware Overview Hardware Overview Features ‰ Vram ‰ LAN/MODEM Shows the front of the computer Shows the system units configuration System Block Diagram Hardware Overview System Block Diagram System Block Diagram Hardware Overview ‰ CPU Gpio System Block Diagram Hardware Overview 3.5-inch USB Floppy Disk Drive Hardware Overview 3.5-inch USB Floppy Disk Drive 2.5-inch HDD dimensions 2/2 2.5-inch Hard Disk Drive2.5-inch Hard Disk Drive Hardware Overview Standard 2.5-inch HDD specifications 2/2 96.6 113.2 G8CC0002R220 CD-ROM DriveCD-ROM Drive Hardware Overview Hardware Overview CD-ROM Drive CD-ROM drive specifications Specifications Items G8CC0002W220 G8CC0002E220 DVD-ROM DriveDVD-ROM Drive Hardware Overview Specifications G8CC0002W220 DVD+R, DVD+RW, DVD-RAM 2.6GB/4.7GB DVD-ROM & CD-R/RW Drive Hardware Overview DVD-ROM & CD-R/RW DriveItems Standard Panasonic Items Panasonic G8CC0002J220 CD-ROM, CD-R, CD-RW, CD-Audio Disc DVD Super Multi drive DVD Super Multi drive Hardware OverviewItems Standards G8CC0002T220 G8CC0002S220 Specifications Panasonic G8CC0002T220 2MB CD-DA, CD-ROM, CD-ROM XA CD-DA, CD-ROM, CD-ROM XA, CD-I, Video CD Keyboard Hardware Overview Keyboard LCD Module TFT Color DisplayTFT Color Display Hardware Overview 12 LCD module specifications 15.0-inch SXGA+ TFT 2/2 13 FL inverter board specifications FL Inverter Board Power Supply Hardware Overview Power Supply 1R5-E1V Power Supply Hardware Overview Power supply output rating1R8-B1V Battery specifications Main BatteryBatteries Hardware Overview Batteries Battery Charging Control 16 Time required for charges of main battery17 Battery preservation time Batteries Hardware Overview Condition Time RTC Battery18 Time required for charges of RTC battery 19 AC adapter specifications 1/2 19 AC adapter specifications 2/2AC Adapter AC Adapter Hardware Overview Hardware Overview AC Adapter Chapter Troubleshooting Procedures Troubleshooting Procedures Power Status Check Troubleshooting Procedures Troubleshooting flowchart Set of tool for debug port test Troubleshooting Procedures Troubleshooting Troubleshooting Troubleshooting Procedures Troubleshooting Flowchart Troubleshooting Procedures Troubleshooting Flowchart Troubleshooting Flowchart Troubleshooting Procedures Troubleshooting flowchart 1/2 Troubleshooting flowchart 2/2 Troubleshooting Flowchart Troubleshooting Procedures Power Supply Troubleshooting Troubleshooting Procedures Power Supply TroubleshootingProcedure 1 Power Status Check Battery icon Power Supply Troubleshooting Troubleshooting Procedures Procedure 2 Error Code Check Error code Where Error occurs ‰ DC power supply AC adapter Error code Meaning ‰ E5V output P61 ‰ PPV output P65 ‰ PTV output P75 Procedure 3 Connection Check Procedure 4 Charging Check Procedure 5 Replacement Check System Board Troubleshooting System Board Troubleshooting Troubleshooting Procedures Troubleshooting Procedures System Board Troubleshooting Procedure 1 Message Check KBC Error HDC Error Procedure 2 Debug Port Check A set of tool for debug port test Port Inspection items Details Status Memori Clear CHGFIRMA.EXE Irtbiossignchk Irtinismbaseend Irtinipciend Port Inspection items Details Port status Inspection items Details Ffffh Procedure 3 Diagnostic Test Program Execution Check Procedure 4 Replacement Check Procedure 1 FDD Head Cleaning Check 3.5 FDD Troubleshooting3.5 FDD Troubleshooting Troubleshooting Procedures Troubleshooting Procedures 3.5 FDD Troubleshooting Procedure 2 Diagnostic Test Program Execution CheckFDD error code and status Code Status Procedure 3 Connector Check and Replacement Check Flkcs PCB Procedure 1 Partition Check 2.5 HDD TroubleshootingTroubleshooting Procedures 2.5 HDD Troubleshooting 2.5 HDD Troubleshooting Troubleshooting Procedures Procedure 2 Message Check Procedure 3 Format Check Procedure 4 Diagnostic Test Program Execution Check 2.5 Hard disk drive error code and status Procedure 5 Connector Check and Replacement Check Keyboard Troubleshooting Keyboard Troubleshooting Troubleshooting ProceduresProcedure 1 Diagnostic Test Program Execution Check Procedure 2 Connector Check and Replacement Check Procedure 1 External Monitor Check Display TroubleshootingTroubleshooting Procedures Display Troubleshooting Display Troubleshooting Troubleshooting Procedures Procedure 3 Connector and Cable CheckLCD module FL inverter System board CN5000 Procedure 4 Replacement Check Procedure 2 Connector Check & Replacement Check Touch Pad TroubleshootingTouch Pad Troubleshooting Troubleshooting Procedures Optical Drive Troubleshooting Troubleshooting Procedures Optical Drive Troubleshooting Modem Troubleshooting Modem Troubleshooting Troubleshooting Procedures LAN Troubleshooting Troubleshooting Procedures LAN Troubleshooting Procedure 2 Connector Check Sound TroubleshootingSound Troubleshooting Troubleshooting Procedures Troubleshooting Procedures Sound Troubleshooting Procedure 3 Replacement Check Wireless LAN Troubleshooting Wireless LAN Troubleshooting Troubleshooting ProceduresProcedure 1 Transmitting-Receiving Check Procedure 2 Antennas Connection Check Troubleshooting Procedures Wireless LAN Troubleshooting Chapter Tests and Diagnostics Tests and Diagnostics Heatrun Test 20.120.2 21.1 31.1 Function Description Accessing the Setup Program Tables Tests and Diagnostics Diagnostics menu Diagnostic TestTests and Diagnostics Diagnostic Test Diagnostic Test Tests and Diagnostics 2 H/W Hardware initial information setting tool Heatrun test program Diagnostics menu T&D Executing the Diagnostic TestExecuting the Diagnostic Test Tests and Diagnostics Tests and Diagnostics Executing the Diagnostic Test System Test Name 2 H/W initial information setting tool Setting of the hardware configuration Setting of the hardware configuration Tests and Diagnostics Tests and Diagnostics Setting of the hardware configuration Setting of the hardware configuration Tests and Diagnostics Tests and Diagnostics Heatrun Test Heatrun Test Test Name Subtest No Subtest Name Subtest Names Tests and DiagnosticsSubtest Names Tests and Diagnostics Subtest Names Subtest names 2/2 Async System Test Tests and Diagnostics System Test Tests and Diagnostics System Test Memory Test Tests and Diagnostics Memory Test Tests and Diagnostics Keyboard Test Keyboard Test Display Test Tests and Diagnostics Display Test Tests and Diagnostics Display Test Display Test Tests and Diagnostics Tests and Diagnostics Floppy Disk Test Floppy Disk Test Floppy Disk Test Tests and Diagnostics Tests and Diagnostics Printer Test Printer Test Confidential Tests and Diagnostics Async Test Async Test Hard Disk Test Tests and Diagnostics Hard Disk Test Tests and Diagnostics Hard Disk Test HDD Real Timer Test Tests and Diagnostics Real Timer Test Real Timer Test Tests and Diagnostics Tests and Diagnostics NDP Test NDP Test Expansion Test Expansion Test Tests and DiagnosticsSub# Address Good Bad Contents Tests and Diagnostics Expansion Test CD-ROM/DVD-ROM Test Tests and Diagnostics CD-ROM/DVD-ROM Test Device name Error code Error status name Error Code and Error Status NamesTests and Diagnostics Error Code and Error Status Names PRT Time OUT No Pcmcia Hard Disk Test Detail Status Hard Disk Test Detail Status Tests and DiagnosticsHard disk controller status register contents BBK Program Description Operations If Test OK, Press DellEnterkey Only ONE Test Button, return to the only ONE Test menu automatically Subtest 05 USB Press Enter and following message appears in the display Head Cleaning Head Cleaning Tests and DiagnosticsFunction Description Enter Tests and Diagnostics Log Utilities Log Utilities Log Utilities Tests and Diagnostics 00 00 0000 FDD-WRITE Protected Tests and Diagnostics Running Test Running Test Floppy Disk Drive Utilities Tests and Diagnostics Floppy Disk Drive Utilities Tests and Diagnostics Floppy Disk Drive Utilities Floppy Disk Format & Copy DIAGNOSTICS-HARD Disk & Floppy Disk Dump Following message will appear. To finish the dump, select System Configuration Tests and Diagnostics System Configuration System Configuration Tests and Diagnostics System Configuration Display Ver X.XX Machine Name??? Wireless LAN Test Program Intel-made b/g MAC = Setting the responder machine 11g Communication Test NG Wireless LAN Test Program Intel-made a/b/g SKU NG Aux Antenna Test NG 11a Communication Test NG Confidential Setting the tester DUT machine Wireless LAN Test Program Askey-madeWireless LAN Test Program Askey-made Tests and Diagnostics Tests and Diagnostics Wireless LAN Test Program Askey-made MAC Address Check OK Tests and Diagnostics Wireless LAN Test Program Askey-made 29 LAN/Modem/Bluetooth/IEEE1394 Test Program LAN test LAN transmit & receive test Completed Repeat count 00000 Confidential Modem test Modem loopback test Bluetooth test Sssss Error message Message Contents Error code for Bluetooth test Bdaddr 1/2 See the Specification of the Bluetooth System in detail Eeeeeee MM P M M M P Error code for Bluetooth test Bdaddr of the DUT 1/2 Confidential IEEE1394 test Sound Standard test Sound Test program Tests and DiagnosticsSound Test program Tests and Diagnostics Sound Test program Sound Legacy test CD Sound Standard test Pass Count Write Data Read Data Address Xxxxxx Status XXX Return to the CD Sound Standard menu after the test ends CD Sound Legacy test Setup Setup Tests and Diagnostics Tests and Diagnostics Setup Accessing the Setup Program Confidential Moving Within the Setup Menu and Changing Values Accepting Changes and Exiting the Setup WindowFactory Preset Configuration HDD Mode Password Write Policy Setup Options System Date Sets date System Time Sets time Setup Tests and Diagnostics Using the AC adapter Low Fn+F1 Setup Tests and Diagnostics LCD Display Stretch Ntsc US Auto Power On Enable the Execute-Disable Bit functionDisable the Execute-Disable Bit function All Devices COM level LPT setting Interrupt level AddressLPT setting Interrupt level Address DMA channel CD-ROM ECP Legacy Emulation Chapter Replacement Procedures Replacement Procedures Overview Parallel port board/Serial port board/S-Video board 105 Removing Battery Pack 53 to 4-100 Replacing Fluorescent Lamp Overview Replacement Procedures Overview Replacement Procedures Overview Safety Precautions Before You Begin Disassembly Procedures Assembly Procedure Tools and Equipment Screw Tightening Torque Grip Color Screw Notation Battery Pack Removing the battery pack Battery Pack/PC CardReplacement Procedures Battery Pack/PC Card Battery Pack/PC Card Replacement Procedures Installing the battery pack Installing the PC card PC Card Removing the PC card Removing the memory module Memory Module Replacement ProceduresMemory Module Replacement Procedures Memory Module Removing Memory Module Installing the memory module Removing the MDC Replacement Procedures MDCMDC MDC Replacement Procedures Installing the MDC Removing the HDD Replacement Procedures HDDHDD HDD Replacement Procedures Removing HDD Assy Installing the HDD Wireless LAN card Wireless LAN card Replacement ProceduresNever press hard or bend the wireless LAN card Removing the Wireless LAN card Replacement Procedures Wireless LAN card Installing the Wireless LAN card Removing the Cooling fin/CPU Cooling Fin/CPU Replacement ProceduresCooling Fin/CPU 12 Removing CPU Holder 13 Removing Cooling Fin Replacement Procedures Cooling Fin/CPU Installing the Cooling fin/CPU 16 Applying Silicon Grease Replacement Procedures Keyboard Removing the Keyboard Keyboard Replacement Procedures 18 Removing Keyboard 19 Removing Keyboard support plate Installing the Keyboard Removing the Switch membrane board Switch membrane boardReplacement Procedures Switch membrane board Switch membrane board Replacement Procedures Installing the Switch membrane board Removing the Optical drive Replacement Procedures Optical DriveOptical Drive Installing the Optical drive 22 Removing the bracket Removing the Display assembly Display AssemblyReplacement Procedures Display Assembly Display Assembly Replacement Procedures 24 Removing screws and cables under keyboard 25 Removing Display Assembly Installing the Display assembly Replacement Procedures Sound Board Installing the Sound BoardSound Board Removing the Sound Board Parallel port board / Serial port board / S-Video board Parallel port board Removing the Parallel port board 28 Removing parallel port board Installing the Parallel port board Serial port board Removing the serial port board 29 Removing serial port board Installing the Serial port board Video board Removing the S-Video board 30 Removing S-Video board Installing the S-Video board Replacement Procedures 14 Fan Installing the Fan14 Fan Removing the Fan Removing the system board/DC-IN jack/RTC battery System Board/DC-IN Jack/RTC BatterySystem Board/DC-IN Jack/RTC Battery Replacement Procedures Replacement Procedures System Board/DC-IN Jack/RTC Battery 33 Removing System board Installing the System board/DC-IN jack/RTC battery Replacement Procedures PC card cover Installing the PC card coverPC card cover Removing the PC card cover Removing the Battery latch Battery LatchBattery Latch Replacement Procedures Replacement Procedures Battery Latch Installing the Battery latch Removing the Battery lock Battery LockBattery Lock Replacement Procedures Replacement Procedures Battery Lock Installing the Battery lock Removing the Touch pad Touch Pad Replacement ProceduresTouch Pad Replacement Procedures Touch Pad Installing the Touch pad Removing the LCD unit/FL inverter LCD Unit/FL Inverter Replacement ProceduresLCD Unit/FL Inverter Replacement Procedures LCD Unit/FL Inverter 41 Removing FL Inverter and LCD Unit 42 Removing LCD Bracket Installing the FL inverter/LCD unit Latch Assembly Latch Assembly Replacement ProceduresRemoving the Latch assembly Installing the Latch Assembly Removing the Wireless LAN antenna/Speaker/Hinge Wireless LAN Antenna/Speaker/HingeReplacement Procedures Wireless LAN Antenna/Speaker/Hinge Wireless LAN Antenna/Speaker/Hinge Replacement Procedures 44 Removing wireless LAN antennas 45 Removing LCD harness Holder Remove the wireless LAN antenna cables 48 Removing Optical drive cover 49 Removing speaker cables 50 Removing Speakers Installing the Wireless LAN antenna/Speaker/Hinge 52 Attaching sponges Replacement Procedures Wireless LAN Antenna/Speaker/Hinge Type Supplier Section Fluorescent Lamp Replacement ProceduresFluorescent Lamp Replacement Procedures Fluorescent Lamp 53 Replacing 15.0 Inch Samsung fluorescent lamp XGA 54 Replacing 15.0 Inch Samsung fluorescent lamp XGA 56 Replacing 15.0 Inch Samsung fluorescent lamp XGA Fluorescent Lamp4 Replacement Procedures 57 Replacing 15.0 Inch Samsung fluorescent lamp XGA 58 Replacing 15.0 Inch Samsung fluorescent lamp XGA 59 Replacing 15.0 Inch Samsung fluorescent lamp XGA 60 Replacing 15.0 Inch Samsung fluorescent lamp XGA 61 Replacing 15.0 Inch Samsung fluorescent lamp XGA Assembling the 15.0-inch XGA Samsumg Fluorescent Lamp 62 Replacing 15.0 Inch Sharp fluorescent lamp XGA 64 Replacing 15.0 Inch Sharp fluorescent lamp XGA 65 Replacing 15.0 Inch Sharp fluorescent lamp XGA 67 Replacing 15.0 Inch Sharp fluorescent lamp XGA 68 Replacing 15.0 Inch Sharp fluorescent lamp XGA 69 Replacing 15.0 Inch Sharp fluorescent lamp XGA 70 Replacing 15.0 Inch Sharp fluorescent lamp XGA Replacement Procedures4.23 Fluorescent Lamp 71 Replacing 15.0 Inch Sharp fluorescent lamp XGA Assembling the 15.0 Inch XGA Sharp Fluorescent Lamp 72 Replacing 15.0 Inch Sharp fluorescent lamp XGA 73 Replacing 15.0 Inch Sharp fluorescent lamp XGA 76 Replacing 15.0 Inch Sharp fluorescent lamp XGA Upper diffusion sheet Lens sheet Light guide 78 Replacing 15.0 Inch Sharp fluorescent lamp XGA 79 Replacing 15.0 Inch Sharp fluorescent lamp XGA 81 Replacing 15.0 Inch Sharp fluorescent lamp XGA 83 Replacing 15.0 Inch Sharp fluorescent lamp XGA 84 Replacing 15.0 Inch Sharp fluorescent lamp XGA 85 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 86 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 87 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 88 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA Assembling the 15.0-inch XGA LG.Philips Fluorescent lamp 89 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 91 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 92 Replacing 15.0 Inch LG.Philips fluorescent lamp XGA 93 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 94 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 95 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 96 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ Assembling the 15.0 Inch SXGA+ LG.Philips Fluorescent lamp 97 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 98 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 99 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 100 Replacing 15.0 Inch LG.Philips fluorescent lamp SXGA+ 114 Appendices Appendices Appendix Contents App-iv Appendices Figure B-1 System board layout front Table C-9 Table C-10Table C-11 Table C-12 Table D-7 Precautions for handling the LCD module Appendix. a Handling the LCD Module Appendices Appendices Appendix. a Handling the LCD Module Satellite A50S/TECRA A3X Maintenance Manual Appendices Appendix. a Handling the LCD Module Appendix. a Handling the LCD Module Appendices Appendices Appendix. a Handling the LCD Module System Board Front View Appendix. B Board Layout Appendices Mark Number Name System Board Back View Figure B-2 System board layout back CPU Sound Board Flgsn Front Back Parallel port Board Flgcp Appendices Appendix. B Board Layout Serial port Board Flgsr Video Board Flkcs System Board Flksy CN1400 Memory 0 Connector 200-pin Table C-1 Memory 0 connector pin assignment 200-pin 1/4Pin No Signal name Signal Name Appendix. C Pin Assignment Appendices GND ADM3-B1P ADQS3-B1N ADQS3-B1P ADQS4-B1N ADQS7-B1P Pin No Signal name CN1410 Memory 1 Connector 200-pinTable C-2 Memory 1 connector pin assignment 200-pin 1/4 GND BDM3-B1P BDQS3-B1N BDQS3-B1P BDQS4-B1N CN1800 HDD I/F Connector 44-pin Table C-3 HDD I/F connector pin assignment 44-pin CN1810 Optical Drive I/F Connector 50-pin Table C-4 Optical drive I/F connector pin assignment 50-pin Appendices Appendix. C Pin Assignment IS2110 PC Card I/F Connector 70-pinTable C-5 PC card I/F connector pin assignment 70-pin 1/2 ACSTSC-PYP ACAD30-PYP ACCD2-P3N GND CN2300 Docking I/F connector 240-pin Table C-6 Docking I/F connector 240-pin1/4 DVIPD0-P3N DCADIO-S3P GND PME-S3P DSSCL-S5P DSSDA-S5P CN2200 Mini PCI I/F Connector 124-pin Table C-7 Mini PCI I/F connector pin assignment 124-pin 1/2 P3V CLKRUN-P3N SERR-P3N GND PERR-P3N CBE1-P3N CN3010 MDC I/F Connector 12-pin CN3490 Debug Port Connector 12-pinTable C-8 MDC I/F connector pin assignment 12-pin Table C-9 Debug port connector pin assignment 12-pin 10 CN3200 Keyboard I/F Connector 34-pin 11 CN3240 Touch Pad I/F Connector 4-pinTable C-10 Keyboard I/F connector pin assignment 34-pin Table C-11 Touch pad I/F connector pin assignment 4-pin Table C-12 Switch board I/F connector pin assignment 10-pin 12 CN3280 Switch Board I/F Connector 10-pin13 CN3502 FLGCP/FLGSR Board I/F Connector 30-pin 16 CN4610 USB I/F Connector 0 4-pin 14 CN4100 Network I/F Connector 14-pin15 CN4611 USB harness I/F Connector 8-pin 17 CN5000 LCD I/F Connector 41-pin Table C-17 LCD I/F connector pin assignment 41-pin 20 CN6001 Speaker Connector Left 3-pin 18 CN5620 RGB I/F Connector 15-pin19 CN5340 S-Video I/F Connector 5-pin 23 CN8800 DC-IN Connector 4-pin 21 CN6002 Speaker Connector Right 2-pin22 CN9500 Sound Board I/F Connector 18-pin 26 CN8770 FAN I/F Connector 4-pin 24 CN8020 1st Battery Connector 10-pin25 CN9990 RTC Battery Connector 3-pin 28 J6310 Headphone Connector 6-pin 29 CN9510 System Board I/F Connector 18-pinTable C-28 Headphone Connector pin assignment 6-pin Table C-29 System board I/F Connector pin assignment 18-pin Table C-30 System board I/F Connector pin assignment 10-pin Table C-31 System board I/F Connector pin assignment 30-pin 34 CN4622 USB I/F Connector 1 4-pin 32 CN4613 Parallel I/F Connector 25-pin33 CN4620 USB harness I/F Connector 8-pin Video Board Flgcs 35 PJ4610 USB harness I/F Connector 8-pin 36 PJ4612 USB I/F Connector 1 4-pin37 PJ4611 USB I/F Connector 2 4-pin 38 PJ5640 System Board I/F Connector 5-pin 39 PJ5641 S-Video Connector 4-pin Table C-39 S-Video Connector pin assignment 4-pin Table C-40 System board I/F Connector pin assignment 30-pin 43 CN4632 USB I/F Connector 1 4-pin 41 CN3440 Serial I/F Connector 9-pin42 CN4630 USB harness I/F Connector 8-pin Appendices Appendix. C Pin Assignment Cap Keytop Code set Make Break Appendix. D Keyboard Scan/Character Codes AppendicesTable D-1 Scan codes set 1 and set 2 1/4 Caps Lock Enter Shift L No.102 ALT R 122 F11 123 F12 124 PrintSc 126 Pause 202 203 Win 204 App With left Shift With right Shift Set AA E0 2A E0 F0 12 E0 Table D-4 Scan codes with Fn key Cap Code set Keytop Make Break Table D-6 No.124 key scan code Key Shift Code set Top Make Keyboard Layout Appendix. E Key LayoutAppendices Appendices Appendix. E Key Layout Appendix. F Wiring Diagrams Appendices RGB Monitor ID Wraparound Connector 15-pin to 15-pinParallel Port Wraparound Connector Appendices Appendix. F Wiring Diagrams Appendix G BIOS/KBC/EC Update Appendix. G BIOS/KBC/EC Update Appendices Appendices Appendix. G BIOS/KBC/EC Update Component Time hours Appendix. H Reliability AppendicesTable H-1 Mtbf Appendices Appendix. H Reliability