Safety and maintenance
description
Transcript of Safety and maintenance
Safety and maintenance
Unit objectives: Examine safety issues and hazards in
the computer environment Identify preventative maintenance
tasks for personal computers Identify ways to avoid injury and strain
when working with computers Examine proper methods for disposing
of computer equipment
Topic A
Topic A: Safety and hazards Topic B: Computer maintenance Topic C: Safe work practices Topic D: Disposing of computer
equipment
Office hazards: floor surfaces
Floors should be level and dry Carpets should be secured to the floor Cables and power cords should not
cross walkways Use antistatic mats to protect
equipment from static electricity
Office hazards: fire safety
Keep papers orderly – In metal file cabinet when possible
Keep combustibles away from coffee pots, hot plates, personal heaters
Keep working smoke detectors in all areas of building
Keep fire extinguishers readily available for each type of equipment you have
Fire extinguisher classes
Extinguishers list appropriate uses– Newer ones use a picture– Older ones use color-coded shapes
Four classes– A: Ordinary combustibles – B: Flammable liquids – C: Electrical equipment – D: Flammable metals
Fire extinguisher types
Dry chemicals Halon Water CO2
Office hazards: electrical safety
Don’t overload electrical circuits Label breakers in electrical box Use surge protectors and UPS Don’t string together power strips Don’t run electrical cords or network
cables across walkways Encase cords in a cord protector Provide good ventilation for equipment Secure cords out of the way
– Can use cable ties, but don’t cinch tightly
Office hazards: air quality
Use fans to keep air as clear as possible
Don’t smoke around computers Clean computer
fans periodically Place working
carbon monoxide detectors around building
Computer hazards
Physical Electrical
Physical hazards
Use care when lifting and moving heavy or bulky equipment
When lifting, take a balanced stance Lift with leg muscles, not arms and back Keep back straight Grip with entire hand Bring equipment close to your body Keep the CRT screen towards body Make sure you can see where you’re going Restrain neckties, loose clothing, jewelry,
and long haircontinued
Physical hazards, continued
Heat:– Laptop burns– Internal components
Electrical hazards Use care when working with any electrical
equipment– Turn it off and unplug it, unless you don’t have
an ESD strap Inspect equipment wiring for defects Don’t use damaged or frayed electrical
cords Remove metal jewelry, watches, and rings
before working on equipment Do not allow any liquid near equipment Identify electrical ratings of equipment DON’T OPEN CRT unless specially trained
Laser printer and copier toner
Toner– Mixture of plastic resin, iron powder, and
carbon black– Particles are 10 microns or smaller– Can irritate respiratory tract – Can cause allergic skin reaction
Use facemask and gloves Clean up spills with special vacuum Recycle cartridges Replaceable ozone filters
Incident reporting
Company should have written policy– Handling accidents– Reporting incidents
Proper documentation required for OSHA, workmen’s comp claims, and insurance
Activity A-1
Identifying typical office and computer-related hazards
High-voltage interference: outside
Lightning Atmospheric conditions that produce
lightning Wind Radio stations Citizens band (CB) radios Police radios
High-voltage interference: inside
Differences in electrical potential – In various parts of the building – Between objects in the building
Currents flow for short periods of time Disrupts low-voltage network data flow Electromagnetic fields around equipment Imperfectly wired electrical connections Appliances and fluorescent lights Object movements
Electrostatic discharge (ESD)
Buildup of electrical charge on surface of object– Typically rubber, plastic, glass, other items that
aren’t good conductors Buildup remains until bleed off to ground or
static discharge When objects touch, brief and sudden electrical
current flows between them To feel discharge: 3000 volts or more To see spark: 8000 volts or more ESD of a few hundred volts can damage
electronics and destroy data CRTs and TVs produce static charges
Electromagnetic interference (EMI)
Produced by fluorescent lights Ballast creates electromagnetic field
around transformer– Causes phosphorus in bulb to glow
Can produce similar current in nearby objects
Don’t run network cables near fluorescent lights
Minimizing high-voltage interference
Level of interference depends on– Climatic conditions in the area – Proximity to radio stations, power lines,
industrial plants – Construction of building
Defenses against interference– Maintenance– Installing ground wires– Using antistatic devices
Shielding and filtering
Shielding – Applies primarily to a network’s cables – Is a refined form of grounding – Used in STP cable
Filters – Electronic devices that permit the normal
function of a device while blocking or suppressing other signals
– Can place on source or recipient of interference– AC power-line filters, RFI filters, network filters
Activity A-2
Finding sources of static electricity and interference
Topic B
Topic A: Safety and hazards Topic B: Computer maintenance Topic C: Safe work practices Topic D: Disposing of computer
equipment
Ventilation, dust, and moisture control
Keep fan openings and ventilation holes clear
Clean with compressed air, computer vacuum, or air compressor
Humidity level at 50% Clean printers regularly Rubbing alcohol cleans ink smudges
Printer/scanner maintenance
Vendor publishes recommended schedule and list of tasks
Usually based on printing volume Ensure suitable operating environment
Activity B-1
Discussing preventative maintenance
Cleaning computer equipment
Wear latex or other synthetic gloves Liquid cleaning compounds
– Dampen, don’t soak cloth
Cleaning contacts and connections Non-static vacuums Cleaning monitors, keyboards, mice
Activity B-2
Cleaning computer equipment
MSDS
Physical data Toxicity Health effects First aid Reactivity Storage Disposal Protective equipment Spill and leakage procedures
MSDS hazard ratings
Rating Description
None No potential hazard in this category
0 The least hazard
1 A slight hazard
2 A moderate hazard
3 Highly hazardous
4 Extremely hazardous
Personal protection by rating
Rating Description
A Wear goggles when using this product
B Wear goggles and gloves when using this product
C Wear goggles, gloves, and other protective gear when using this product
Activity B-3
Reading a material safety data sheet
Topic C
Topic A: Safety and hazards Topic B: Computer maintenance Topic C: Safe work practices Topic D: Disposing of computer
equipment
Ergonomic workstations
Check position of: Chair Monitor Keyboard Mouse Document holders Office equipment
– Phones – Other equipment
Laptop safety
Weight Ergonomic issues Heat
Activity C-1
Avoiding injury and strain when working with PCs
Topic D
Topic A: Safety and hazards Topic B: Computer maintenance Topic C: Safe work practices Topic D: Disposing of computer
equipment
Computer equipment disposal
Disposing of electronics– Hazardous materials
Disposing of used toner and ink cartridges
Disposing of computer equipment– Reusing equipment– Methods of disposal
Activity D-1
Selecting the proper methods for computer equipment disposal
Unit summary
Examined safety issues and hazards in the computer environment
Identified preventative maintenance tasks for personal computers
Identified ways to avoid injury and strain when working with computers
Examined proper methods for disposing of computer equipment