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to the system board. It is an omnidirectional condenser microphone with a
standard sensitivity of 40dB. The microphone is mounted in a rubber boot
to provide acoustic isolation and is mounted at the right side of the
keyboard, under the CPU cover.
Status Panel
The status panel is located immediately below the LCD panel on the system
unit. The panel displays a series of icons to indicate system status as
described in Table 1-3.
The status panel also contains two status indicator lights. The right
indicator light provides battery status; the left indicator light provides
power-on and Standby (Suspend) status. Access to the display panel for
service requires removal of the CPU cover. The status display is secured
with two screws. The status panel cable plugs into an 8-pin connector on
the processor board.
Processor Board
The processor board supports the following:
o Processor
o DC-to-DC converter is used only with processors that operate at higher
than 75 MHz.
o L2 cache
o System RAM
o System memory expansion connector
o Power, display, and standby switches
o Infrared serial port (IrDA)
o Display panel configuration jumpers
o Power-on password jumper
The computer supports 75, 90, 100, 120, 133-, and 150-MHz Mobile Pentium
processors. The processor is soldered to the processor board, so
replacement is accomplished by replacing the processor board. A heat sink
on the processor and a cooling fan maintain an operating temperature
within the limits specified by the CPU manufacturer and other components.
All I/O buffers operate at 3.3 volts.The 75-MHz processor core operates at
3.3 volts. The 150-MHz processor core operates at 3.1 volts. The 90-Mhz,
100mhz, 120-MHz, and 133-MHz processor cores operate at 2.9 volts. The 2.9
volts is provided by a DC-to-DC converter mounted on the processor board.
The processors are of a tape carrier package (TCP) design that has a high
pin count, low profile, and reduced footprint. The processor is easily
damaged, so the pins and body of the processor should not be touched.