3 Typical fault profiles
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3 Typical fault profiles
3.1 Fault profiles related to the PC
3.1.1 Power supply
The motherboard and drives are supplied with power by an integrated switched--mode power
supply.
T ypical power supply fault profiles are:
-- Supply voltage that is characterized by dropouts or spikes
-- Output voltage overload
-- Output voltage failure
-- Internal overheating due to fan failure
-- Defects in power switch and ATX power--on logic
3.1.2 Basic configuration
The processor, main memory, CMOS memory and other hardware are integrated onto the
motherboard.
T ypical faults in the motherboard basic configuration are:
-- Memory faults in the CMOS--RAM due to undervoltage in the lithium battery
-- Incorrect BIOS entries
-- Memory faults in the main memory (RAM modules)
-- Overheating due to failure of CPU fan
3.1.3 Drives
The hard drive, floppy disk drive and CD--ROM drive are integrated into the PC chassis.
T ypical faults in the drives are:
-- Hard drive defect caused by impact or vibration
-- Data error caused by dust in the floppy disk drive and CD--ROM drive
-- Cabling fault in the IDE bus and floppy disk bus
3.1.4 PC--related peripherals
PC--related peripherals include input and output devices and additional plug--in cards.
T ypical faults in the PC--related peripherals are:
-- Keyboard does not respond
-- Monitor display faults
-- Fault in the interplay between the VGA chip and the KVGA card
-- Bus errors and communication errors due to incorrectly configured plug--in cards
(MFC, Ethernet, field bus cards)