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

oDC-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

3.3volts. 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.