Chapter 20 Flashcards
What are some of the hardware symptoms and causes. p987
Excessive Heat Noise Odors and Smoke Status Light Indicators Alerts Visible Damage
Overclocking is what? p988
Overclocking is running the processor faster than it was designed to run .
One way to ensure that dust and grime don’t find their way into your computer is to always leave the__________ in the empty slots on the back of your box. p988
Blanks
what are Blanks? p988
Blanks are the pieces of metal or plastic that come with the case and cover the expansion slot openings. They are designed to keep dirt, dust, and other foreign matter from the inside of the computer.
How does Creeping Chips happen? p989
After several hundred such cycles, some components can’t handle the stress and begin to move out of their sockets .
Why is it important to never touch internal components when the case is off and the power is on? p989
cause it could result in a severe electrical shock to you and/or the components .
If the computer doesn’t POST as it should, one way to determine the source of a problem is to listen for what? p991
A Beep code
How can you minimize the risk Motherboard and CPU problems. p992
Handle a motherboard as little as possible, and keep it in an antistatic bag whenever it’s removed from the PC case.
Keep all liquids well away from the motherboard; water can cause a short circuit.
Wear an antistatic wrist strap when handling or touching a motherboard.
Identifying I/O Port and Cable Problems p993
The cables are snugly connected.
The port has not been disabled in BIOS Setup.
The port has not been disabled in Device Manager in Windows.
No pins are broken or bent on the male end of the port or on the cable being plugged into it.
(GPFs)stands for what? p993
general protection faults (GPFs)
Identifying Hard Disk System Problems p997
The adapter (that is, the SATA, IDE, or SCSI interface) is bad.
The disk is bad.
The adapter and disk are connected incorrectly.
What are some specific hard-drive-related issues, the likely culprits, and actions to take: p997
Loud clicking or scratching noises
Slow performance or read/write failures
Boot problems
What are some of the common symptom and their cause of the monitor and video card. p1000
Booting into VGA mode No image on the screen Monitor that keeps shutting down Dead pixels or artifacts Incorrect colors Dim or flickering images Distorted images
What are some the key concepts when working on laptops: p1002
Document and label screw and cable locations .
Have a clear organization method for your parts and screws .
Refer to the manufacturer’s documentation .
Use the appropriate hand tools .
Dim or flickering displays on laptops are usually caused by a____________ in the display panel .p1003
faulty backlight and inverter
Another problem unique to laptop keyboards is the___ key. p1004
Fn key
Dot-Matrix Printer Problems. p1007
Low Print Quality
Printout Jams inside the Printer
Stepper Motor Problems
The parts on an inkjet can be divided into four categories: p1009
Print head/ink cartridge
Print head carriage, belt, and stepper motor
Paper-feed mechanism
Control, interface, and power circuitry
Inkjet Printer Problems p1009
Print Quality Color Output Problems Paper Jams Paper-Feeding Problems Stepper Motor Problems Power Problems
What are the six steps to the EP printing process.p1013
Cleaning Charging Writing Developing Transferring Fusing
A rubber blade scrapes any remaining toner off of the drum and a fluorescent lamp discharges any remaining charge on the photosensitive drum . p1013
Cleaning
Gets a high voltage from the high voltage power supply (HVPS) . It uses the voltage to apply a strong uniform negative charge (–600VDC) to the photosensitive drum .p1013
Charging
The laser scans the drum . Wherever it touches the drum, the charge is reduced from –600VDC to around –100VDC . The pattern formed on the drum will be the image that is printed .p1013
Writing
Acquires a –600VDC charge from the HVPS and picks up toner, which gets the same –600VDC charge . Toner rolls by the photosensitive drum, the toner is attracted to the lesser-charged (–100VDC) areas on the photosensitive drum and sticks to it in those areas .p1013
Developing
The charging corona wire or roller acquires a strong positive charge (+600VDC) and transfers it to the paper . As the photosensitive drum with ink on it rolls by, the ink is attracted to the paper .p1013
Transferring
The 350˚ F fuser roller melts the toner paper and the rubberized pressure roller presses the melted toner into the paper, making the image permanent .p1013
Fusing
What are the three major causes of blank pages on an Laser printer. p1017
TONER CARTRIDGE
TRANSFER CORONA ASSEMBLY
HIGH-VOLTAGE POWER SUPPLY (HVPS)
What is Ghosting? p1021
Ghosting is what you have when you can see light images of previously printed pages on the current page. This is caused by one of two things: a broken cleaning blade or bad erasure lamps.
What are the error codes for the laser printers. p1023-1024
00 ready 02 warming up 05 self test 11 paper out 13 paper jam 14 no ep cart 15 engine test 16 toner low 50 service 51 -52-55 error
