HP Pavilion manual 32

Table 1-8. Functional Structure Description

Bootup	CPU module	Main processor (MMO)
	Motherboard	Primary system circuitry, system BIOS
	Hard disk drive	First source of disk-based startup code
	Floppy drive	Second source of disk-based startup cod.
Processor	CPU module	Main processor, numeric data processor, L1 and L2 cache
	Motherboard	Primary system circuitry
Memory	Motherboard	Video RAM (XE4500)
	SDRAM module	Changeable SDRAM (2 slots), video RAM (XE4100)
Power	Battery	Power storage
	Motherboard	AC adapter socket, reset button, lid switch, power supply, power control circuitry
		Power button
	Switchboard PCA	AC-to-DC converter
	AC adapter
Display	Motherboard	Graphics controller, video RAM
	SDRAM module	Display output, backlight, power converter for backlight
	Display assembly
Hard disk	Motherboard	Hard disk controller
	Hard disk drive	Hard disk mechanism
Floppy drive	Motherboard	I/O controller, floppy connector
	Floppy drive	Floppy drive mechanism
Keyboard	Motherboard	Keyboard BIOS, keyboard controller
	Switchboard PCA	Power switch, one-touch buttons
	Keyboard	Key switches
PS/2	Motherboard	Keyboard circuitry, keyboard controller, keyboard BIOS
TouchPad	Top case	Touch pad sensor, Select buttons, controller (PS/2 output)
Audio	Motherboard	Audio controller, audio decoder, speaker amplifier, microphone, external audio
	Speaker assembly	jacks, headphone amplifier, audio-off switch
		Speakers
Status	Motherboard	LED circuitry, keyboard controller
	Switchboard PCA	Keyboard LEDs
	Top case	Main status LEDs
Serial	Motherboard	I/O controller, serial connector
Parallel	Motherboard	I/O controller, parallel connector
Infrared	Motherboard	I/O controller
	IR PCA	Infrared transmitter/receiver
PS/2 port	Motherboard	PS/2 connector, keyboard controller
USB	Motherboard	Bus controller (South Bridge), USB connector
S-Video	Motherboard	I/O controller, S-video connector (certain models)

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