compaq lte elite User Manual

circuits:
o Main expansion base circuit (+/- 5 volts, +/- 12 volts)
o VBatt1 circuits (10 to 18.5 volts)
o VBatt2 circuits (10 to 18.5 volts)
The outputs to the above circuits are located on an edge card connector in
the power supply. The vertical circuit board plugs into this edge card
connector to distribute power to the unit.
Refer to Appendix A for pin assignments for the power supply output
connector.
Figure 6-9 illustrates the function of the power supply output circuits.
Main Expansion Base...

VBatt1 Circuits
The VBatt1 circuits provide 10 to 18.5 volts to the following:
o Computer (while docked)
o Docking mechanism
VBatt2 Circuits
The VBatt2 circuits provide 10 to 18.5 volts to the following:
o Battery charger in expansion base
o Voltage regulator on the expansion base system board, which converts 18.5
volts to 5 volts for the microcontroller, sensors, and wiring harness.
NOTE: The microcontroller controls the VBatt2 circuits.
Power-Up Sequencing
The VBatt1 and VBatt2 circuits power up...

The expansion base has a motorized docking mechanism (Figure 6-10) that
docks and undocks the computer. The mechanism uses a sled apparatus; draw
hooks on the sled mate with notches in the bottom of the computer. The
mechanism does not operate if the unit is locked with a key or if a sensor
detects an undesirable condition such as an open PCMCIA door when a request
to undock is made.
If a computer cannot automatically undock from the expansion base due to a
malfunction or power failure, it can be...

The expansion base has a two-part computer status sensor [1] (Figure 6-11)
on the docking mechanism sled. This sensor corresponds to two sense pads on
the bottom of the Compaq LTE Elite [2] or the bottom of a SmartStation
Adapter when connected to a Compaq LTE Lite. The computer status
sensor/sense pad combination indicates whether the computer is on, off, or
in Standby. The expansion base uses this information to determine if the
computer should be allowed to dock/undock. Refer to Appendix D for more...

6. Edge card connection to the power supply
7. Edge card connector to the system board
8. Configuration switches for optional drives
In addition, the circuitry for the expansion base registers and hard drive
decode are on the vertical circuit board.
Configuration Switches
The configuration switches [8] (Figure 6-12) are accessible when the bottom
cover is removed. The configuration switch settings are listed on a label
on the bottom of the drive cage in drive position 1 (Figure 6-14). Refer to
Appendix...

IMPORTANT: Skirted expansion boards cannot be installed in the expansion
board connector that is next to the drive cable connectors [5]
(Figure 6-13).
Drive Cages/Drive Bays 

The expansion base has two half-height drive cages for installing internal
drive options in the drive bays. The expansion base comes from the factory
with blank panels that cover the drive bay openings. The drive bays are
designated as drive positions 1 and 2 [1], [2] (Figure 6-14).
To be supported in the expansion base, drives must meet the power
requirements in Section 10.2, and the dimension requirements in Section
10.1.
Refer to Appendix C to configure the system for drives other than SCSI-2.
Refer...

backplane board) and the system board (also known as the interconnect
board) each have a printed description of where the drive cables connect.
Each drive cable also has a printed description, a Compaq spare part
number, and a Compaq assembly part number. Refer to Section 9.15 for more
information on drive cable locations.
Power Switch Cable Harness
The power switch cable harness [7] (Figure 6-15) runs from the power switch
[8] to the harness extension cable on the system board [1] and includes the...

replaced separately using parts from the Miscellaneous Small Mechanical
Parts Kit (Table 8-8).
NOTE: The eject switch board is integrated into the eject switch cable
harness. To replace the eject switch board, the eject switch cable
harness must be replaced (Section 9.17).
Keylock Switch
The keylock switch [2] (Figure 6-15) is connected to the eject switch cable
harness. The keylock switch is actuated by the keylock assembly and is
closed when the keylock is in the locked position (refer to Keylock...

Keylock Assembly and Override Blocker
The keylock assembly [1] and override blocker [2], located in the bottom
cover, work together to provide system security (Figure 6-16).
The keylock assembly mechanically locks the bottom and top cover of the
expansion base together and closes the keylock switch. When closed, the
keylock switch electronically disables the docking mechanism (to prevent
unauthorized docking and undocking of the computer).
When locking the expansion base, the keylock assembly moves the...