compaq lte elite User Manual

							Power/ On Power on LED on top of unit Green
standby Flashing Standby (active when display is
open). Identical LED on
front of unit (active
when display is closed).
---------------------------------------------------------------------------
Battery On Battery Front of unit Orange
State charging
Flashing LowBatt 1
at one
per
second
Flashing LowBatt 2
at two
per
second
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Hard Drive On Hard drive Front of unit Green
Activity being
accessed
---------------------------------------------------------------------------
Diskette On Diskette Front of unit Green
Drive drive being
Activity accessed
---------------------------------------------------------------------------
Scroll On Scroll lock Top of unit Green
Lock selected
---------------------------------------------------------------------------
Caps Lock On Caps lock Top of unit Green
selected
---------------------------------------------------------------------------
Num Lock On Num lock Top of unit Green
selected
===========================================================================
Display Switch
The computer has a display switch mounted on the power interface board
(PIB) located near the display hinge. When the display is closed, this
switch activates the front-mounted power/standby LED and simultaneously
deactivates the display and the top-mounted LEDs.
Trackball
The computer has an integrated PS/2 style trackball located on the display
bezel. The trackball is disabled whenever an external mouse is connected to
the keyboard/mouse connector. The trackball buttons are located on the back
side of the display.
1.5 Connectors 
This section covers the I/O pass-through connectors on the computer
(Figure 1-4). Refer to Appendix A for connector pin assignments. 
						

							1. AC power
2. Automobile Adapter
3. Serial
4. 198-pin external options
5. Keyboard/mouse
6. Parallel
7. External monitor
8. Numeric keypad
9. PCMCIA
AC Power Connector
When the computer is docked in the convenience base and the convenience
base is turned on, AC power is applied to the computers AC power
connector. (The 198-pin connector carries all other signals between the two
units.)
Automobile Adapter Connector
The computer has an automobile adapter connector that accepts an 18.5 volt,
1.73 amp DC input from the Automobile Adapter. This connector is covered
by an access door (Figure 1-5). 
						

							NOTE: The automobile adapter converts 12 volts DC from the automobile to
18.5 volts DC for use by the computer.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION >>>>>
						

							Keyboard/Mouse Connector
The keyboard/mouse connector can be connected to a PS/2 mouse or an external
enhanced keyboard. Connecting the mouse/keyboard connector to a mouse
disables the integrated trackball, while connecting the mouse/keyboard
connector to an external keyboard disables the internal keyboard.
Parallel Connector
The parallel connector supports the parallel interface which meets
EPP 1.9 specifications.
External Monitor Connector
The external monitor connector provides an output for an external monitor
with a maximum resolution of 1024 x 768 lines.
NOTE: The computer can simultaneously display on an external monitor and
the integrated display panel.
Numeric Keypad
Connecting the numeric keypad connector to an external numeric keypad
disables the embedded numeric keypad feature.
PCMCIA Connector
The computer has a PCMCIA connector accessible through a PCMCIA slot on the
left side of the computer (refer to PCMCIA Slot in Section 1.6). The
PCMCIA connector supports the PCMCIA interface which meets PCMCIA 2.1
specifications.
1.6 Functional Descriptions 
This section covers functional descriptions of key parts and features of
the computer. For assembly/disassembly instructions for the parts described
in this section, refer to Chapter 4.
System Board 
						

							The system board (Figure 1-6) provides the following: 
o Connector for removable hard drive [1] 
o PCMCIA connector [2] (refer to PCMCIA Slot)
o Board-to-board connection to the following devices:- Power interface board (PIB) [3] 
- Processor board [4] 
- Memory expansion board (on underside of system board)
o Cable connection to the following devices: - Internal AC power supply board [5] 
- Fan [6] 
- Internal keyboard [7] 
- Display [8]
- Diskette drive [9] 
- LED  cable  assembly  for  fron t-mounted  LEDs  (on  underside  of  system  board) 
						

							o Battery charging circuitry and battery contacts [10] for battery pack 
o External input/output (I/O) connectors (Figure 1-4)
o DC-to-DC power supply (refer to DC-to-DC Power Supply in this section)
o 256 Kbyte flashable shared system ROM and keyboard ROM 
o 4 or 8 MB base RAM (depending on the model) 
o System controller, which provides the following:- Interface to the processor board for memory management (includingmemory refresh)
- Two DMA controllers 
- Two interrupt controllers 
- Clock generator
- Programmable interval timer
- System management interrupt (SMI) support logic
- Power management features
o Peripheral controller, which provides the following: - Integrated keyboard controller
- Industry Standard Architecture (ISA) support logic
- Circuit for interfacing to the hard drive 
- Control of parallel and serial interfaces, including serial interfacesfor a numeric keypad, mouse/keyboard, and internal trackball
o PCMCIA controller 
o Local bus video controller
o Diskette drive controller
o Docking sense logic
o Secondary temperature sensor for controlling the fan (refer to Temperature Sensors)
DC-to-DC Power Supply
The DC-to-DC power supply is integrated into the system board. It converts 
DC voltage input to regulated 3.3 volts, 5 volts, and 12 volts DC. The DC 
						

							voltage input comes from one of the following sources:
o Internal AC power supply
o Battery pack
o Automobile adapter
o 198-pin external options connector (from expansion base)
o Auxiliary battery
To replace the DC-to-DC power supply, the system board must be replaced.
Processor Board
The SL Enhanced Intel486 processor has an integrated coprocessor and is
upgradeable by replacing the processor board (Figure 1-7). The system
automatically adjusts to the new configuration. In addition, the processor
board contains the primary temperature sensor (refer to Temperature
Sensors).
Some models have a heat sink attached. The computer comes with one of the
following processors:
o 486 DX4/75 MHz
o 486 DX2/50 MHz
o 486 DX2/40 MHz 
						

							NOTE: The 75 MHz processor is also available as an upgrade option.
Temperature Sensors
The primary temperature sensor is located on the processor board and the
secondary temperature sensor is located on the system board. These sensors
turn the fan on when the system approaches maximum reliable operating
temperatures.
If the temperature continues to rise, a system management interrupt (SMI)
is generated that creates a pop-up window (depicting a thermometer) to warn
the user of the temperature overload and the unit goes into Standby within
several seconds. If the temperature continues to rise, the computer turns
itself off.
NOTE: The temperature sensors are integrated into the processor board and
the system board. To replace a temperature sensor, the appropriate
board must be replaced.
Power Interface Board (PIB)
The power interface board (PIB) (Figure 1-8) is mounted to the system board
by a 16-pin connector. The PIB provides the following features: 
						

							o Numeric keypad connector
o Speaker and speaker amplifier
o Power switch
o Standby button
o Display switch
o The following LEDs:
- Power/standby
- Scroll lock
- Caps lock
- Num lock
Refer to Section 1.4 for more information on the controls and LEDs listed
above.
Memory Expansion Board
The 4 or 8 MB base RAM memory (depending on the model) may be increased by
adding an optional memory expansion board (Figure 1-9). The memory
expansion board plugs directly into the back side of the system board
(Section 4.6).
The system supports the following 3.3 volt memory expansion boards (which
operate at 70ns): 
						

							o4MB
o8MB
o16MB
NOTE: Some early memory expansion boards for the Concerto Family of
Personal Computers (option kit numbers 144790-001 and 144790-002)
operate at 80 ns and do not function properly when installed in the
Compaq LTE Elite Family of Personal Computers, which operate at
70 ns. Use only Compaq LTE Elite memory expansion boards
(Table 3-2).
Refer to the table in Section 5.3 for a list of total RAM memory based on
available system memory and memory obtained from the expansion board.
Internal AC Power Supply (AC-to-DC)
The computer is powered by a high-efficiency, board-mounted, internal
AC-to-DC power supply (Figure 1-10). The power supply provides the computer
with an 18.5 volt DC output for running all computer functions, including
charging the internal battery pack.
Fan