compaq lte elite User Manual

							NOTE: The first time you dock the computer in the convenience base, you
may be prompted to run Computer Setup to configure optional
devices. The computer automatically detects and configures many
optional devices. In some instances you will be prompted to
accept or reject a configuration change or to run Computer Setup.
Follow the instructions on the screen to change the system
configuration when required. Refer to Section 6.7 for more
information on running Computer Setup.
12. To turn off the computer (but not undock) use one of the following
methods:
o Save and close open files and turn off system power with the power
button on the convenience base or the power switch on the computer.
o From the Compaq Tab or Compaq Group box, go to Compaq Utilities and
select Shutdown. Then select Options. Save open files when prompted.
IMPORTANT: Do not eject from the convenience base before reading the next
section Undocking the Computer.
Undocking the Computer
To undock the Compaq LTE Elite from the Compaq MiniStation, complete the 
						

							following steps:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION >>>>>>
						

							5. Slide the computer toward you to remove it from the convenience base. 
						

							Appendix E - Electrostatic Discharge 
 
Introduction 
This appendix covers the proper methods for grounding and the use of
recommended materials and equipment for preventing damage from
electrostatic discharge (ESD).
A sudden discharge of static electricity from a finger or other conductor
can destroy static-sensitive devices or micro circuitry. Often the spark is
neither felt nor heard, but damage occurs. An electronic device exposed to
electrostatic discharge may not be affected at all and will work perfectly
throughout a normal cycle. Or it may function normally for a while, then
degrade in the internal layers, reducing its life expectancy.
Networks built into many integrated circuits provide some protection, but
in many cases, the discharge contains enough power to alter device
parameters or melt silicon junctions.
E.1 Generating Static 
Table E-1 shows how different activities generate static electricity and at
different electrostatic voltage levels.
Table E-1. Typical Electrostatic Voltages
===========================================================================
Relative Humidity
Event 10% 40% 55%
===========================================================================
Walking across carpet 35,000V 15,000V 7,500V
Walking across vinyl floor 12,000V 5,000V 3,000V
Motions of bench worker 6,000V 800V 400V
Removing DIPS from plastic tubes 2,000V 700V 400V
Removing DIPS from vinyl trays 11,500V 4,000V 2,000V
Removing DIPS from Styrofoam 14,500V 5,000V 3,500V
Removing bubble pack from PCBs 26,000V 20,000V 7,000V
Packing PCBs in foam-lined box 21,000V 11,000V 5,000V
---------------------------------------------------------------------------
NOTE: 700 volts can degrade a product.
===========================================================================
E.2 Preventing Electrostatic Damage To Equipment 
Many electronic components are sensitive to ESD. Circuitry design and
structure determine the degree of sensitivity. The following proper
packaging and grounding precautions are necessary to prevent damage: 
						

							o To avoid hand contact, transport products in static-safe containers such
as tubes, bags, or boxes.
o Protect all electrostatic parts and assemblies with conductive or
approved containers or packaging.
o Keep electrostatic sensitive parts in their containers until they arrive
at static-free stations.
o Place items on a grounded surface before removing them from their
container.
o Always be properly grounded when touching a sensitive component or
assembly.
o Place reusable electrostatic-sensitive parts from assemblies in
protective packaging or conductive foam.
Use transporters and conveyors made of antistatic belts and metal roller
bushings. Mechanized equipment used for moving materials must be wired to
ground and proper materials selected to avoid static charging. When
grounding is not possible, use an ionizer to dissipate electric charges.
Preventing Damage To Drives
To prevent static damage to diskette drives and hard drives, use the
following precautions:
o Handle drives gently, using static-guarding techniques.
o Store drives in the original shipping containers.
o Avoid dropping drives from any height onto any surface.
o Handle drives on surfaces that have at lease one inch of shock-proof
foam.
o Always place drives PCB assembly side down on the foam.
E.3 Grounding Methods 
The method for grounding must include either a wrist strap or a foot strap
at a grounded workstation. When seated, wear a wrist strap connected to a
grounded system. When standing, use footstraps and a grounded floor mat.
Table E-2. Static-Shielding Protection Levels
===========================================================================
Method Voltages
===========================================================================
Antistatic plastic 1,500
Carbon-loaded plastic 7,500
Metallized laminate 15,000
=========================================================================== 
						

							Grounding Workstations
To prevent static damage at the workstation, use the following precautions:
o Cover the workstation with approved static-dissipative material. Provide
a wrist strap connected to the work surface and properly grounded tools
and equipment.
o Use static-dissipative mats, heel straps, or air ionizers to give added
protection.
o Handle electrostatic sensitive components, parts, and assemblies by the
case or PCB laminate. Handle them only at static-free workstations.
o Avoid contact with pins, leads, or circuitry.
o Turn off power and input signals before inserting and removing connectors
or test equipment.
o Use fixtures made of static-safe materials when fixtures must directly
contact dissipative surfaces.
o Keep work area free of nonconductive materials such as ordinary plastic
assembly aids and Styrofoam.
o Use field service tools, such as cutters, screwdrivers, vacuums, that are
conductive.
o Use a portable field service kit with a static dissipative vinyl pouch
that folds out of a work mat. Also use a wrist strap and a ground cord
for the work surface. Ground the cord to the chassis of the equipment
undergoing test or repair.
E.4 Grounding Equipment 
Use the following equipment to prevent static electricity damage to
equipment:
Wrist Straps are flexible straps with a minimum of 1 megohm +/- 10%
resistance in the ground cords. To provide proper ground, a strap must be
worn snug against the skin. On grounded mats without banana-plug
connectors, connect a wrist strap with alligator clips.
Heelstraps/Toestraps/Bootstraps can be used at standing workstations and
are compatible with most types of shoes or boots. On conductive floors or
dissipative floor mats, use them on both feet with a minimum of 1 megohm
resistance between operator and ground. To be effective, the conductive
strips must be worn in contact with the skin.
E.5 Recommended Materials And Equipment 
Other materials and equipment that are recommended for use in preventing
static electricity include: 
						

							o Antistatic tape
o Antistatic smocks, aprons, or sleeve protectors
o Conductive bins and other assembly or soldering aids
o Conductive foam
o Conductive table-top workstations with ground cord of 1 megohm resistance
o Static dissipative table or floor mats with hard tie to ground
o Field service kits
o Static awareness labels
o Wrist straps and footwear straps providing 1 megohm +/-10% resistance
o Material handling packages
o Conductive plastic bags
o Conductive plastic tubes
o Conductive tote boxes
o Metal tote boxes
o Opaque shielding bags
o Transparent metallized shielding bags
o Transparent shielding tubes 
						

							Appendix F - Connecting and Configuring Optional  
SCSI-2 Devices 
 
Introduction 
This appendix contains guidelines for using SCSI-2 (small computer system
interface-2) devices, and explains how to connect external SCSI-2 devices,
install an internal SCSI-2 drive in the Compaq SmartStation, and install
SCSI-2 device drivers.
The expansion base has a built-in SCSI-2 controller, which allows you to
daisy-chain up to seven (one internal) SCSI-2 devices, such as hard drives,
CD-ROM drives, tape drives, WORM (write once read many) drives, DAT
(digital audio tape) drives, scanners, and printers. The expansion base
supports most external SCSI-2 compliant devices.
NOTE: Refer to Section 10.5 for SCSI-2 controller specifications.
The Compaq SCSI-2 Controller is supported under MS-DOS Version 5.0 or
higher and Microsoft Windows Version 3.1 or higher.
NOTE: You cannot boot from a SCSI-2 hard drive in the expansion base.
Selecting the A/B or C/D drive selection switches (Section C.3) on
the rear panel of the expansion base or enabling the A/B or C/D
configuration switches (Section C.2) on the vertical circuit board
have no effect on a SCSI-2 drive.
F.1 SCSI-2 General Guidelines 
The following are general guidelines for using SCSI-2 devices:
1. Not all SCSI devices are compatible with the integrated SCSI-2
controller. Ensure that the options you are installing are SCSI-2
compliant.
2. Every SCSI-2 device requires a unique ID number, from 0 to 7. The ID
number uniquely defines each peripheral device and determines the device
priority on the bus. ID number 7 has the highest priority; ID number 0
has the lowest. ID 7 has been assigned to the integrated SCSI-2
controller in the expansion base.
3. Every SCSI chain requires two terminators - one on the first device in
the chain and one on the last device in the chain. Termination is used
to control noise and signal reflection on the lines.
The integrated SCSI-2 controller in the expansion base has an active
terminator that automatically becomes deactivated according to your
configuration. If you use only internal devices or only external
devices, the SCSI-2 controller is automatically terminated. If you mix
internal and external devices, the SCSI-2 controller is not terminated.
Refer to the documentation included with the SCSI-2 device to determine
whether it has an active terminator or a passive terminator that you 
						

							must install or remove according to your configuration.
4. External cables must be a minimum of 1 foot in length (0.3 meters). The
combined length of SCSI-2 cables in a chain must not be longer than
approximately 20 feet (6 meters).
5. Generally, each SCSI-2 device requires a software driver.
6. Most SCSI-2 drivers require that their associated device be turned on
during startup to recognize the device. Therefore, turn on external
SCSI-2 devices before turning on the expansion base.
F.2 Sample SCSI-2 Configuration 
Figure F-1 shows a sample configuration with a mixture of internal and
external SCSI-2 devices. The device at each end of the chain is terminated.
The controller and the devices plugged into the middle of the chain are not
terminated.
NOTE: The SCSI-2 controller has active termination; you do not have to
install or remove a terminator on the controller.
1. Expansion base
2. Internal SCSI-2 device - terminated (T)
3. SCSI-2 controller - automatically terminated (AT) when required
4. External SCSI-2 device - terminated (T)
5. External SCSI-2 device - not terminated 
						

							F.3 Changing The SCSI-2 Ddefault Configuration 
By default, the integrated SCSI-2 controller has the configuration settings
listed in Table F-1. To adjust the default settings, refer to the Compaq
EZ-SCSI Software Reference Guide.
Table F-1. SCSI Default Configuration
===========================================================================
Parameter Value
===========================================================================
SCSI ID 7
Parity Disabled
Disconnect Disabled (no disconnect)
Synchronous Negotiation Disabled (do not attempt synchronous
negotiations)
===========================================================================
IMPORTANT: If Parity, Disconnect, or Synchronous Negotiation is not
supported by a SCSI-2 device in the chain, you may want to leave
that feature disabled.