Page 1
Cou
rse
ILT
Video and multimedia input/output devices
Unit objectives Describe, install, and troubleshoot
CRT displays Describe, install, and troubleshoot
LCD displays Connect and use speakers and a
microphone Connect and troubleshoot scanners
and digital cameras
Page 2
Cou
rse
ILT
Topic A
Topic A: Cathode ray terminals Topic B: LCDs and other video
technologies Topic C: Sound input and output
devices Topic D: Scanners and cameras
Page 3
Cou
rse
ILT
CRT monitor
Page 4
Cou
rse
ILT
CRT components
Cathode Anode Phosphors Pixel triad Electronic beam positioning
– Shadow mask– Aperture grill– Slotted mask
Page 5
Cou
rse
ILT
How CRTs produce images
Page 6
Cou
rse
ILT
Activity A-1
Examining how CRTs produce images
Page 7
Cou
rse
ILT
CRT characteristics
Screen size Aspect ratio Resolution Refresh rate Dot pitch Flat or curved screen
Page 8
Cou
rse
ILT
Activity A-2
Comparing monitor specifications
Page 9
Cou
rse
ILT
Video connectors Pin Transmits
1 Red video out
2 Green video out
3 Blue video out
4 Monitor ID bit 2
5 Ground
6 Red ground/return
7 Green ground/return
8 Blue ground/return
9 Not used
10 Sync ground/return
11 Monitor ID bit 0
12 Monitor ID bit 1
13 Horizontal sync
14 Vertical sync
15 Monitor ID bit 3
Page 10
Cou
rse
ILT
Display properties
Screen resolution Color quality Monitor settings Color depth
Page 11
Cou
rse
ILT
Display adjustments
Brightness Contrast Position of image on screen Adjustment method varies by monitor
Page 12
Cou
rse
ILT
Activity A-3
Installing a CRT
Page 13
Cou
rse
ILT
CRT issues
Screen is black Image flickers or distorts Noisy monitor Image scrolling Video Display Troubleshooter
Page 14
Cou
rse
ILT
Activity A-4
Troubleshooting CRT problems
Page 15
Cou
rse
ILT
Topic B
Topic A: Cathode ray terminals Topic B: LCDs and other video
technologies Topic C: Sound input and output
devices Topic D: Scanners and cameras
Page 16
Cou
rse
ILT
Flat panel monitor
Page 17
Cou
rse
ILT
LCD advantages
Less power is used Less heat is created Use less desk space Less glare Less radiation emitted
Page 18
Cou
rse
ILT
How a flat panel screen works
Page 19
Cou
rse
ILT
Flat panel monitor characteristics
Screen size Viewing angle Response rate Contrast ratio Native resolution Brightness Other features
– Change orientation– Built-in speakers– Anti-theft lock– Wall mounting
Page 20
Cou
rse
ILT
Flat panel monitor connections
Connection types– 15-pin VGA style connection cable– DVI-D– DVI-I
Page 21
Cou
rse
ILT
DVI-D
Digital-only connection Dual-link contains 24 pins in 3 rows of
8 plus a grounding slot Single-link contains 18 pins
Page 22
Cou
rse
ILT
DVI-D connector
DVI-D connector
Page 23
Cou
rse
ILT
DVI-I
Supports digital and analog signals DVI-I contains 4 additional pins over
DVI-D Extra 4-pins carry analog signals Analog signal pins located above and
below the grounding slot
Page 24
Cou
rse
ILT
TMDS Transition minimized differential
signaling Protocol used to transmit data to
digital monitor No analog conversion Single-link cables use one TDMS
transmitter Dual-link cables use two TDMS
transmitters Supported resolutions
– Single-link up to 1920x1080– Dual-link up to 2048x1596
Page 25
Cou
rse
ILT
Touch screen
Touch-sensitive surface– Pressure-sensitive resistors– Infrared sensors– Electronic capacitors
Uses– PDAs– Point-of-sale terminals– Bank ATMs
Page 26
Cou
rse
ILT
Touch screen input methods
Additional layer with electrical current Capacitors between layers Acoustic waves
Page 27
Cou
rse
ILT
Activity B-1
Examining how LCDs produce images
Page 28
Cou
rse
ILT
Multiple monitors
Page 29
Cou
rse
ILT
Display projectors
Show computer screen to large groups Useful for meetings and classroom Connect using
– VGA– S-Video– Composite– USB– Serial
Page 30
Cou
rse
ILT
DisplayPort technology
New specification developed by VESA Covers
– Displays CRT LCD Plasma Projection
– Connections PCs Game systems DVD players Other image sources
Page 31
Cou
rse
ILT
Activity B-2
Installing an LCD monitor
Page 32
Cou
rse
ILT
LCD monitor issues
Indicator light colors Shaky image Fuzzy image No image Discolored image
Page 33
Cou
rse
ILT
Activity B-3
Troubleshooting LCD problems
Page 34
Cou
rse
ILT
Topic C
Topic A: Cathode ray terminals Topic B: LCDs and other video
technologies Topic C: Sound input and output
devices Topic D: Scanners and cameras
Page 35
Cou
rse
ILT
Speakers connected to a PC
Page 36
Cou
rse
ILT
Speakers connected together
Page 37
Cou
rse
ILT
Activity C-1
Connecting speakers
Page 38
Cou
rse
ILT
Microphone connection to a PC
Page 39
Cou
rse
ILT
Activity C-2
Using a microphone
Page 40
Cou
rse
ILT
Music keyboard connected to ⅛” jack
Page 41
Cou
rse
ILT
MIDI connections
Page 42
Cou
rse
ILT
Activity C-3
Connecting musical instruments to a computer
Page 43
Cou
rse
ILT
Topic D
Topic A: Cathode ray terminals Topic B: LCDs and other video
technologies Topic C: Sound input and output
devices Topic D: Scanners and cameras
Page 44
Cou
rse
ILT
Flatbed scanner
Page 45
Cou
rse
ILT
Multifunction sheetfeed scanner
Page 46
Cou
rse
ILT
Hand-held scanner
Page 47
Cou
rse
ILT
TWAIN
Supported by scanners and imaging applications
“Never the twain shall meet” TWAIN eases scanner connection Most scanners have more full-featured
software from manufacturer
Page 48
Cou
rse
ILT
Scanner configuration features
Image type Scan mode Scan resolution Scaling Destination Image control Preview features Scan
Page 49
Cou
rse
ILT
Scanner connections
Older scanners– Slow parallel ports– SCSI devices
Current scanners– USB – FireWire– All PnP-compliant
Use Device Manager to update driver
Page 50
Cou
rse
ILT
Activity D-1
Connecting a scanner
Page 51
Cou
rse
ILT
Troubleshooting
Acquire information about the problem Simplify by removing any non-critical
components, shut down unnecessary running programs, and disconnect from the Internet or network.
Implement by identifying probable causes and implementing potential solutions one at a time.
Document the error symptoms, the components you removed from the computer, and the solutions you tried and whether they were successful.
Page 52
Cou
rse
ILT
Activity D-2
Troubleshooting scanner problems
Page 53
Cou
rse
ILT
Digital cameras
Connect via USB or FireWire May or may not require drivers Quality of picture expressed in
megapixels Cameras available from 1 megapixel
to over 8 megapixels
Page 54
Cou
rse
ILT
ResolutionsMegapixels Good for Max print size Found in
Under 1 MP Broadcasting over the Internet
Web cameras (webcams)
1 to 2 MP E-mailing pictures 4x6 inches Camera phones, still shot on digital video cameras, older digital cameras
3 to 4 MP Printing, e-mailing, using on Web if you crop image
5x7 inches Mid-range, consumer-grade, digital cameras
5 to 8 MP Large prints 8x10 inches “Prosumer” digital cameras
Over 8 MP Professional use; very large prints
11x14 inches and larger
Prosumer and professional grade digital cameras
Page 55
Cou
rse
ILT
Digital camera memory cards
CompactFlash Memory Stick Secure Digital SmartMedia xD-Picture Card
Page 56
Cou
rse
ILT
Digital camera memory cards (con’t)
Page 57
Cou
rse
ILT
Printing images
No film development costs Store and view photos on computer Print at home Print at store Home prints aren’t same quality as
store
Page 58
Cou
rse
ILT
Digital camera connections
Still cameras - USB Video camera – Firewire Devices run on batteries
– Rechargeable– Disposable– If disposable, use digital-rated
Card readers– Built-in– External device
Page 59
Cou
rse
ILT
Memory card readers
Page 60
Cou
rse
ILT
Activity D-3
Connecting a digital camera
Page 61
Cou
rse
ILT
Camera connection problems
Batteries Cable Camera mode Device manager
Page 62
Cou
rse
ILT
Activity D-4
Troubleshooting digital camera connection problems
Page 63
Cou
rse
ILT
Unit summary Described, installed, and resolved
issues with CRT displays Described, installed, and resolved
issues with LCD displays Connected and used speakers and a
microphone Connected and resolved issues with
digital cameras and scanners