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.Note: There are a number of command-line switches that can be enteredwhen starting up PC-Doctor to enable automatic virus scanning, enableloopback testing of serial/parallel ports, work from the remote menu if per-nforming remote operations, etc.To get a listing of the available command-line switches, startup PC-Doctor with the following command: PCDR /? andpress Enter.Troubleshooting 5-9Note: If PC-Doctor detects a virus, it will stop with an error message.Youmust then use one of the standard virus detection and removal programs tonremove the virus.5.3.5.5 Quitting PC-DoctorTo exit PC-Doctor, select the Quit pull down menu and then select the Quitto DOS option.Note: For additional information, press F1 twice to access the online Refer-n ence manual for PC-Doctor.5-10 Troubleshooting6Field Service6.1 IntroductionThis section contains preventive and corrective maintenance procedures forthe Extensa 51x Series Notebook Computers.The first part of the sectiondescribes the computer cleaning procedures and preferred handlingprocedures for sensitive components (e.g.disk drives, batteries).The second part of the section identifies all field-replaceable parts; theremainder of the section contains removal and replacement procedures forthe field-replaceable parts.6.2 Preventive MaintenancePreventive maintenance is limited to cleaning the plastic case, the interior ofthe notebook including the keyboard, touchpad and the LCD screen.6.2.1 Cleaning the ComputerWhen it is necessary to clean the plastic case and keyboard, use a soft,lint-free cloth, slightly dampened with a mild detergent solution or use thecontents of any commercially available computer cleaning kit.Caution: Never use alcohol, petroleum-based solvents, or harsh deter-gents to clean your computer.Also never spray any liquids directly onthe computer case, keyboard, or screen.If the liquid-crystal displayc(LCD) screen has become smeared or dusty, clean the screen by first ap-plying a mild glass cleaner to a soft, clean, lint-free cloth, and gentlywipe the glass.Never apply liquids directly on the screen surface.Caution: Do not use paper towels to clean the display screen.Paper cancscratch the display screen matte.Field Service 6-16.2.2 Protecting the Disk DrivesTo protect the disk drives and data, back up the system disk periodically onfloppy diskettes.Periodically use a head-cleaning diskette in the floppydiskette drive to prolong the life of the drive and to help maintain dataintegrity.6.2.3 Handling the Computer Battery PackThe battery pack furnished with the computer requires reasonable care andhandling to ensure efficient operation and maximum life.Periodicallyinspect the battery terminals and the batteries for evidence of corrosion andoxide build-up; clean if necessary.To ensure that the battery pack endures a normal life cycle, always observethe following precautions when handling the battery pack:" Do not drop the battery pack or subject it to excessive shock andvibration." Do not expose the battery pack to direct sunlight, moisture, or chemicalcompounds." Do not disassemble the battery pack." Do not use the battery pack to power other devices." Do not short the battery leads or connect the battery with reversedpolarity." Never attempt to charge the battery pack in any way other than asdescribed in this manual." Always charge the battery pack as soon as possible after a low batteryindication.6.2.4 Restoring System SoftwareThe hard drive on the notebook computer is factory loaded with Windows 95or Windows for Workgroups and ready for operation.Supplied with thesystem is a utility for creating backup diskettes of the system software.Inthe event of a disk crash or other problem, you can use the Windows 95Startup diskette or other backup diskettes to boot the unit and performtroubleshooting.6-2 Field Service6.3 Required Tools and EquipmentAll notebook computer corrective maintenance procedures can be performedusing the following tools:" Tweezers" Small flat-blade screwdriver" Small Phillips screwdriver" Hexagonal Screwdriver" Plastic Stick" Conductive mat/wrist or ankle grounding strap system for electrostaticvoltage protection.Caution: All boards, options and peripherals contain components thatare sensitive to static electricity.When handling any of these items, pro-c tect against static electricity by using wrist or ankle grounding strapsand grounded conductive mats.When moving or storing items, use theanti-static bags supplied with the items.6 [ Pobierz całość w formacie PDF ]