Course : Computer Hardware Servicing NC II nit o! Competenc" : #aintain Computer S"stem and Networ$s #odu%e : #aintaining Computer S"stem and Networ$s &earning 'utcome (: P%an and Prepare #aintenance Procedures Assessment Criteria: Planning and preparing preparing for maintenance maintenance task is organized as a prerequisite. 1. 2.
OHS OHS pol polic icie ies s ar are car carri ried ed out out alo along ng with with the the tas task. k. Computer system is regularly checked in compliance with maintenance procedures. . !ppr !pprop opri riat ate e mater materia ials ls ar are used used for for ens ensur urin ing g work work del deli" i"er ery y that that conforms with task speci#cations. $. Proper per tool tools s% equi equip pmen ment an and d test testin ing g de" de"ices ices for for maint ainten enan ance ce purposes are o&tained and checked against correct operation and safety. '. Computer system and network are maintained &ased on the manual instructions Re!erences: 1. (igelow% Stephen ).% PC Technician’s Troubleshooting, McGraw Hill 2. *elly%+ianne,ose% Computer -aintenance and rou&leshooting Hand&ook Rose Ne%son /0( Ne%son /0( httphome.comcast.net3 3. Sandler%Corey% 4i5 6our Own PC%-7S Press 4. *uhlman% +a"e% dkuhlman8re55.com httpwww.re55.com3dkuhlman +a"e httpwww.re55.com3dkuhlman +a"e *uhlman. his documentation is co"ered &y he -7 9icense httpwww.opensource.orglicensesmit:license 5. -eyers%-ike%7ntroduction to PC Hardware and rou&leshoo rou&leshooting%-cgrawHill ting%-cgrawHill 6. www.eser"iceinfo.com . httpcsd2.computer.org !. httpse"ier.comwps ". www.yahoo.com
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
( ; P a g e
P%an and Prepare #aintenance Procedures Introduction: Planning and preparing systematic maintenance procedure procedure sa"e time% money and frustration. 7t is a good idea and opportunity to learn the proper care and maintenance of your computer. PC maintenance is an important topic for anyone who owns a PC. 9ooking after your PC properly ensures you of trou&le:free use. ,egular PC maintenance also keeps the machine
• • • • •
+esign a monitoring% e"aluating and updating plan. Place your computer in a well:"entilated area. Schedule use of computer for its longer life. -o"e the computer only when it is turned o> and unplugged. reat reat your computer computer properly properly.. -aintain your hard disk
2. +esign a systematic maintenance plan for your software. • • • •
(ackup your #les 7nstall or secure passwords +elete temporary #les ?pdate anti:"irus and spy ware
#'N)H&* C'#P)ER #AIN)ENANCE P&AN PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+ ; P a g e
P%an and Prepare #aintenance Procedures Introduction: Planning and preparing systematic maintenance procedure procedure sa"e time% money and frustration. 7t is a good idea and opportunity to learn the proper care and maintenance of your computer. PC maintenance is an important topic for anyone who owns a PC. 9ooking after your PC properly ensures you of trou&le:free use. ,egular PC maintenance also keeps the machine
• • • • •
+esign a monitoring% e"aluating and updating plan. Place your computer in a well:"entilated area. Schedule use of computer for its longer life. -o"e the computer only when it is turned o> and unplugged. reat reat your computer computer properly properly.. -aintain your hard disk
2. +esign a systematic maintenance plan for your software. • • • •
(ackup your #les 7nstall or secure passwords +elete temporary #les ?pdate anti:"irus and spy ware
#'N)H&* C'#P)ER #AIN)ENANCE P&AN PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+ ; P a g e
, ,NE ,&*
AG
SEP)
'C)
N'V
DEC
!nti "irus software checkups +isk space utilization +efragmentation of hard dri"es rou&lesho rou&leshoot ot hardware and software issues
)*PES '- #AIN)ENANCE #AIN)ENANCE PR'CEDRE: .(/ Hardware Hardware maintenance is the testing and cleaning clea ning of equipment. .+/ 7nformation system maintenance is the routine updating of master #les% #les% such such as adding adding and deleti deleting ng employ employees ees and custom customers ers and changing credit limits and product prices. .0/ Soft Softwar ware e or progr program am mainte maintenan nance ce is the updati updating ng of applic applicati ation on programs in order to meet changing information requirements% such as adding new functions and changing data formats. 7t also includes #5ing &ugs and adapting the software to new hardware de"ices. .1/ +isk or #le maintenance is the periodic reorganizing of disk #les that ha"e &ecome fragmented due to continuous updating. Wor$ Wor$ p%ace procedures • •
7dentify hazards and assess risk. 05ecution of OHS policies are carried out along with the task.
4ollowing certain procedure is "ery important to perform a gi"en operation or e"olution or in reaction to a gi"en e"ent. he ta&le &elow shows di>erent elements and their corresponding corresponding performance criteria to &e a&le to identify occupational health and safety hazards% and assess risk% as well as follow instructions and procedure in the workplace with minimal minimal super"ision super"ision.. he students students will also &e capa&le capa&le of participating participating and contri&uting to OHS management issues. E&E#EN) 1. 7dentify hazards and assess risk.
PER-'R#ANCE CRI)ERIA 1.1 7dentify hazards in the work area and during the performance performance of workplace
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
0 ; P a g e
E&E#EN)
PER-'R#ANCE CRI)ERIA duties. 1.2 !ssess le"el of risk
2. 4ollow procedures and strategies for risk control.
2.1 ,eport hazards in the work area to designated personnel according to workplace procedures 2.2 4ollow workplace procedures and work instructions for assessing and controlling risks with minimal super"ision. 2. /hene"er necessary% within the scope of responsi&ilities and competencies% follow workplace procedures for dealing with hazards and incidents% #re andor other emergencies.
. Contri&ute to OHS in the workplace.
.1 +escri&e employee
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
1 ; P a g e
E&E#EN)
PER-'R#ANCE CRI)ERIA .' Pro"ide support in implementing procedures to control risks in accordance with organisational procedures
05amples of OHS issues which may need to &e raised &y workers with designated personnel may include
7denti#ed Hazards Pro&lems encountered in managing risks associated with hazards Clari#cation on understanding of OHS policies and procedures Communication and consultation processes 4ollow up on reports and feed&ack. 0>ecti"eness of risk controls in place raining needs
-aterials% ools% 0quipment and esting +e"ices. Programming )oo%s .(/ Programming tools are used for software de"elopment or system maintenance. Birtually% any program or utility that helps
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
2 ; P a g e
programmers or users de"elop applications or maintain their computers can &e called a tool. 05amples of programming tools are compilers% interpreters% assem&lers% $9s% editors% de&uggers and application generators. .+/ Programming tools help the user analyze or search for data. 4or e5ample% query and report programs are often called query tools and report tools. .0/ !n on:screen function in a graphics programD for e5ample% line draw% circle draw or &rush tool. .1/ ! software control panel for setting user preferences. .2/ Sometimes people will call any software a Etool.E 4or e5ample% the phrase% Ethere arenFt any tools to do that Ao&E means that no application is a"aila&le to perform the required processing. E3uipment4-aci%ities Ser"er Computer peripherals +esktop computers OHS guidelines Phil. 0n"ironmental protection standards -onitors -other&oard Power supply =etwork de"ice and ca&lings Hu&s Switches 9!= Cards Printers and Scanners ,outers
)oo%s 5 Instruments Protecti"e eye wear /ire stripper with cutter
Supp%ies 5 #ateria%s 4loppy disk Compact +isk
PliersG!ssorted Screw dri"ers G!ssorted Soldering irongun +e:soldering tool 4lashlight weezers -irrors !ntistatic wrist wrap 9!= ester Crimping tool Software installer /ork &ench -agnifying glass
?S( 4lash +ri"es
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
6 ; P a g e
P%an and Prepare #aintenance Procedure 1. Prepare+esign a daily maintenance plan for your hardware% G time allotment 1 week #AIN)ENANCE )AS7
#'N
)E
WED
)HR
-RI
,ecali&rate the &attery Clean computer case Clean the key&oard Clean the mouse Clean the screen Clean up hard dri"es 2. +esign a systematic daily plan for your software% G time allotment 1 week #AIN)ENANCE )AS7 #'N )E WED )HR -RIDA* Create an emergency diskette Check for "iruses (ack up #les +efragment hard dri"e Scan hard dri"e for errors Program course ?nit of Competency
Computer Hardware Servicing NCII #aintain Computer S"stem and Networ$s
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
8 ; P a g e
-odule
#aintaining Computer S"stem and Networ$s : #aintain Computer S"stem and Networ$s
&'9+ Assessment Criteria: 1. !ppropriate personal protecti"e equipment are used in conformity with the standard procedures. 2. Periodic maintenance of the equipment is performed following manufacturer
Protecti"e eye wear
4loppy disk
Computer peripherals
/ire stripper with cutter
Compact +isk
+esktop computers OHS guidelines Phil. 0n"ironmental protection standards -onitors -other&oard
PliersG!ssorted Screw dri"ers G!ssorted Soldering irongun +e:soldering tool 4lashlight weezers
Power supply
-irrors
=etwork de"ice and ca&lings
!ntistatic wrist wrap
Hu&s
Crimping tool
Switches
Software installer
9!= Cards
/ork &ench
Printers and Scanners
-agnifying glass
9!= ester
,outers ?S( 4lash +ri"es
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
; P a g e
Re!erence: 1 .-c9aughlin%,o&ert% Sasser%Susan% ,alston%-ary.4i5 6our Own PC.Philippine raphic !rts% 7nc andang Sora St.Caloocan City 2 .-eralco 4aoundation. -icrocomputer Ser"icing Plus. Pasig City% Philippines. 3 .9egaspi%Carlos% CaiIa% -ark !nthony. Operate ! Personal Computer. +asmariIas Computer 9earning Center.+asmariIas%Ca"ite% Philippines 4 .(igelow%Stephen ). PC echnicianworks.com 9 .www.microsoft.comtechnetnetwork
ools and equipment used to protect the user and the computer system. ypes of personal protecti"e de"ices 1. !nti:static de"ices 2. Power surge protectors . Personal equipments ESD .E%ectro Static Disc;arge/ :! small amount of static electricity that can destroy small parts of your computer. Anti
= ; P a g e
2. ?PS G?ninterrupted Power Supply Persona% E3uipment 1. Small paint &rush 2. Screw dri"ers . Pliers and tweezers $. Compressed air '. Handheld "acuum Periodic #aintenance Sc;eme ,egular scheduled upkeep of your computer will keep you and your computer in working smoothly. Dai%" Sc;edu%e ?pdate "irus and spyware de#nitions +o incremental &ackup J &ack up updated #les for each date. ,e&oot upon crash: ,e&oot the computer to #5 your pc upon crash. Wee$%" • • •
4ull "irus and spyware scan Complete &ackup of #les Patch up Jet latest software update for your operating system. #ont;%" • • •
Clean your PC inside and out. +efrag your hard dri"e to speed up its operation. *ear%" • •
Check your programs J clean up unused programs ,eformat your hard dri"e and reinstall the operating system -ake a full diagnostic check on hardware and software Samp%e #aintenance sc;eme • • •
Preventive #aintenance Activit"
Recommended -re3uenc"
Auto>
Scan ;ard dis$ ?%e s"stems !or errors
+aily
6es
Scan !or viruses
+aily
6es
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(@ ; P a g e
ac$ up data
+aily
=o
C%ean CR) screen
/eekly
=o
De!ragment ;ard dis$s
-onthly
6es
Scan !or ;ard dis$ read errors
/eekly
6es
C%ean mouse
-onthly
=o
C;ec$ !or !u%% ;ard dis$ vo%umes and remove unnecessar" ?%es
-onthly
=o
pdate virus de?nition ?%es
-onthly
Sometimes
C;ec$ power protection devices to ensure t;e" are sti%% protecting t;e s"stem
Kuarterly
=o
C;ec$ power supp%" !an !or venti%ation and dirt Bui%dup and c%ean i! necessar"
Kuarterly
=o
ac$ up C#'S in!ormation
Kuarterly
=o
pdate emergenc" Boot oppies
Kuarterly
=o
C%ean opp" dis$ drive interna%s and read4write ;eads
Kuarterly Gdepending on use
=o
C;ec$ processor temperature inspect ;eat sin$ and !an to ensure t;e" are wor$ing
!nnually Gor whene"er case is opened
=o
!nnually Gor C;ec$ ;ard dis$ !or temperature whene"er case is and viBration opened
=o
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(( ; P a g e
C%ean eterior o! case
!nnually
=o
C%ean eterior o! monitor
!nnually
=o
C;ec$ and c%ean interior mot;erBoard and epansion cards i! necessar"
!nnually
=o
C;ec$ interna% connections and caB%es
!nnually
=o
!nnually
=o
Answer t;e !o%%owing 3uestions 1. 4or some&ody who always works with computers% what personal protecti"e de"ices do you usually useL How often do you use themL 2. Computers should &e protected from static electricity to pre"ent component malfunction. /hat anti:static de"ices can you utilize to a"oid such malfunctionL
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(+ ; P a g e
C%eaning t;e #ouse 1. Shut down the PC &efore cleaning the mouse. 2. ,oll the mouse o"er onto its &ack and remo"e the &all access slide co"er. . /ash the mouse &all with water. $. 7nspect the mouse &all
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(0 ; P a g e
C%eaning t;e #onitor 1. urn o> the monitor and unplug it from the power source. 2. ?sing compressed air% clean away any dust on the top of the monitor
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(1 ; P a g e
Procedure in c%eaning t;e $e"Board 1. Shut down the computer and turn o> the computer. 2. +isconnect the key&oard from the computer and lay it upside:down on a at% clean work surface. . ,emo"e the screws that hold together the key&oard case. $. Holding the case together% turn the key&oard o"er% and then remo"e the top co"er. ?se the compressed gas andor &rush and "acuum to clean out the keys. '. aking care not to dislodge any keys% remo"e the key assem&ly from the case. M. 7f the key&oard has a circuit card attached to the key assem&ly% remo"e it and set it aside. N. ,emo"e the screws that hold the &ack metal plate to the key assem&ly. Put the screws in a cup or another container so you won the metal plate. /hat you #nd underneath depends on the design of the key&oard. Carefully lift and clean the contacts on the card with the alcohol and cloth. Q. Pro&a&ly% there will &e some type of ru&&er pad &etween the printed circuit and the &ack of the keys. Carefully lift this up and clean any spill residue from the pad as well as the &acks of the keys. 1R. ,eassem&le the pads% printed circuit% circuit card and metal plate% and then turn the assem&ly right:side up again. 11. 7t would &e a good idea to remo"e the keys and clean them% as well. hey should pop o>. )ust don
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(2 ; P a g e
Printer C%eaning In$Fet Printer 1. Clean the print nozzle regularly. -ost inkAet printers ha"e a &uilt:in utility to clean or unclog the print head nozzles. 6ou should do this regularly% especially if the printer sits idle for a couple of weeks. 2. =e"er turn a printer o> &y pulling the plug from the power source. !lways use the printer. he printer has some &uilt:in functions% such as parking the print head that are tied to the power:o> function of the printer switch. . ?se inkAet quality paper. $. +ust and paper scraps and &its can collect in the &ottom of the paper path in an inkAet printer. ,emo"e the paper scraps and &low out any dust or paper &its that ha"e accumulated with compressed air.
C%eaning "our s"stem unit Cleaning the system unit and its parts is not really dicult to doD you Aust need the proper tools to clean it properly. ?sing compressed air antistatic strap and a Phillips screw dri"er you can e>ecti"ely clean your unit he parts that need cleaning are the > 1. -other&oard 2. -emory . 7nterface cards
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(6 ; P a g e
$. Hard dri"es '. Optical +ri"es M. System Case
Computer Hardware #aintenance and C%eaning E3uipment and #ateria%s: E3uipment System unit -onitor *ey&oard and -ouse
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(8 ; P a g e
Printer #ateria%s Screw dri"er !ir Compressor !nti:static Strap Computer Hardware Maintenance and Cleaning
he student is pro"ided with the necessary equipment and materials to clean the di>erent hardware components of a computer unit. 6ou will &e assessed using the following criteria Eva%uation: Passed
-ai%ed
CRI)ERIA 1. Periodic maintenance is o&ser"ed
2. O&ser"ance of safety precautions.
. !ppropriate materials are used in cleaning the hardware components. $. Con#rmation of computers normal function.
Write "our answers on "our answer s;eet: 1. 0numerate the &asic tools needed in cleaning your system unit. 2. Can we use anti:static glass cleaner when cleaning the monitorL 6es or =o. /hyL . 7s it safe to clean your printer when it is still onL 05plain. $. /hy do we need to shutdown our computer unit &efore we clean and disassem&leL
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
( ; P a g e
Computer Virus
! "irus is a destructi"e e5ecuta&le program that infects the other programs in the system and spreads &y replicating itself. Such a program is designed to damage the "ictim
Virus 'rigins and Histor" People create "iruses. ! person has to write the code% test it to make sure it spreads properly and then release the "irus. ! person also
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
(= ; P a g e
designs the "irusFs attack phase% whether itFs a silly message or destruction of a hard disk. So why do people do itL here are at least three reasons. he #rst is the same psychology that dri"es "andals and arsonists. /hy would someone want to &ust the window on someone elseFs car% or spray:paint signs on &uildings or &urn down a &eautiful forestL 4or some people% that seems to &e a thrill. 7f that sort of person happens to know computer programming% then he or she may funnel energy into the creation of destructi"e "iruses. he second reason has to do with the thrill of watching things &low up. -any people ha"e a fascination with things like e5plosions and car wrecks. /hen you were growing up% there was pro&a&ly a kid in your neigh&orhood who learned how to make gunpowder and then &uilt &igger and &igger &om&s until he either got &ored or did some serious damage to himself. Creating a "irus that spreads quickly is a little like that :: it creates a &om& inside a computer% and the more computers that get infected the more EfunE the e5plosion. he third reason pro&a&ly in"ol"es &ragging rights% or the thrill of doing it. Sort of like -ount 0"erest. he mountain is there% so someone is compelled to clim& it. 7f you are a certain type of programmer and you see a security hole that could &e e5ploited% you might simply &e compelled to e5ploit the hole yourself &efore someone else &eats you to it. raditional computer "iruses were #rst widely seen in the late 1QRs% and they came a&out &ecause of se"eral factors. he #rst factor was the spread of personal computers GPCs. Prior to the 1QRs% home computers were nearly non:e5istent or they were toys. ,eal computers were rare% and they were locked away for use &y Ee5perts.E +uring the 1QRs% real computers started to spread to &usinesses and homes &ecause of the popularity of the 7(- PC Greleased in 1Q2 and the !pple -acintosh Greleased in 1Q$. (y the late 1QRs% PCs were widespread in &usinesses% homes and college campuses.
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+@ ; P a g e
The secon# $actor is the use o$ co%&uter bulletin boar#s. Peo&le coul# #ial u& a bulletin boar# with a %o#e% an# #ownloa# &rogra%s o$ all t'&es. Ga%es are e(tre%el' &o&ular, an# so are si%&le wor# &rocessors, s&rea#sheets, etc. )ulletin boar#s lea# to the &recursor o$ the *irus +nown as the Troan horse. - Troan horse is a &rogra% that soun#s reall' cool when 'ou rea# about it. o 'ou #ownloa# it. /hen 'ou run the &rogra%, howe*er, it #oes so%ething uncool li+e erasing 'our #is+. o 'ou thin+ 'ou are getting a neat ga%e, but it wi&es out 'our s'ste%. Troan horses onl' hit a s%all nu%ber o$ &eo&le because the' are #isco*ere# 0uic+l'. ither the bulletin boar# owner woul# erase the le $ro% the s'ste% or &eo&le woul# sen# out %essages to warn one another. Diferent Aspects o Computer Virus
4inder: searches for the new uninfected #les and the ,eplicator: actually targets these #les and infects it &y multiplying itself. )"pes o! virus Resident Viruses his type of "irus is a permanent which dwells in the ,!- memory. 4rom there it can o"ercome and interrupt all of the operations e5ecuted &y the system corrupting #les and programs that are opened% closed% copied% renamed etc. 05amples include ,ande5% C-)% -e"e% and -r*lunky. Direct Action Viruses he main purpose of this "irus is to replicate and take action when it is e5ecuted. /hen a speci#c condition is met% the "irus will go into action and infect #les in the directory or folder that it is in and in directories that are speci#ed in the !?O0T0C.(! #le P!H. his &atch #le is always located in the root directory of the hard disk and carries out certain operations when the computer is &ooted. 'verwrite Viruses Birus of this kind is characterized &y the fact that it deletes the information contained in the #les that it infects% rendering them partially or totally useless once they ha"e &een infected. he only way to clean a #le infected &y an o"erwrite "irus is to delete the #le completely% thus losing the original content. 05amples of this "irus include /ay% rA.,e&oot% ri"ial..+. oot Virus his type of "irus a>ects the &oot sector of a oppy or hard disk. his is a crucial part of a disk% in which information on the disk itself is stored together with a program that makes it possi&le to &oot Gstart
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+( ; P a g e
the computer from the disk. he &est way of a"oiding &oot "iruses is to ensure that oppy disks are write:protected and ne"er start your computer with an unknown oppy disk in the disk dri"e. 05amples of &oot "iruses include Poly&oot.(% !nti0T0. #acro Virus -acro "iruses infect #les that are created using certain applications or programs that contain macros. hese mini:programs make it possi&le to automate series of operations so that they are performed as a single action% there&y sa"ing the user from ha"ing to carry them out one &y one. 05amples of macro "iruses ,ela5% -elissa.!% (a&las% OQN-62*. Director" Virus +irectory "iruses change the paths that indicate the location of a #le. (y e5ecuting a program G#le with the e5tension .0T0 or .CO- which has &een infected &y a "irus% you are unknowingly running the "irus program% while the original #le and program ha"e &een pre"iously mo"ed &y the "irus. Once infected it &ecomes impossi&le to locate the original #les. Po%"morp;ic Virus Polymorphic "iruses encrypt or encode themsel"es in a di>erent way Gusing di>erent algorithms and encryption keys e"ery time they infect a system. his makes it impossi&le for anti:"iruses to #nd them using string or signature searches G&ecause they are di>erent in each encryption and also ena&les them to create a large num&er of copies of themsel"es. 05amples include 0lkern% -ar&urg% Satan (ug% and uareg. -i%e In!ectors his type of "irus infects programs or e5ecuta&le #les G#les with an .0T0 or .CO- e5tension. /hen one of these programs is run% directly or indirectly% the "irus is acti"ated% producing the damaging e>ects it is programmed to carry out. he maAority of e5isting "iruses &elong to this category% and can &e classi#ed depending on the actions that they carry out. Companion Viruses PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
++ ; P a g e
Companion "iruses can &e considered #le infector "iruses like resident or direct action types. hey are known as companion "iruses &ecause once they get into the system they EaccompanyE the other #les that already e5ist. 7n other words% in order to carry out their infection routines% companion "iruses can wait in memory until a program is run Gresident "iruses or act immediately &y making copies of themsel"es Gdirect action "iruses. Some e5amples include Stator% !simo".1'Q% and erra5.1RMQ -A) Virus he #le allocation ta&le or 4! is the part of a disk used to connect information and is a "ital part of the normal functioning of the computer. his type of "irus attack can &e especially dangerous% &y pre"enting access to certain sections of the disk where important #les are stored. +amage caused can result in information losses from indi"idual #les or e"en entire directories. Worms ! worm is a program "ery similar to a "irusD it has the a&ility to self: replicate% and can lead to negati"e e>ects on your system and most importantly they are detected and eliminated &y anti:"iruses. 05amples of worms include PS/(ug&ear.(% 9o"gate.4% rile.C% So&ig.+% -apson. )roFans or )roFan Horses !nother unsa"ory &reed of malicious code are roAans or roAan horses% which unlike "iruses do not reproduce &y infecting other #les% nor do they self:replicate like worms. &ogic omBs hey are not considered "iruses &ecause they do not replicate. hey are not e"en programs in their own right &ut rather camouaged segments of other programs. How do Virus Afect a System •
7t corrupts #les 7t slows down the speed of the computer system
•
7t causes the system to hang frequently
•
7t deletes "arious #les
•
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+0 ; P a g e
Sources o Virus !nection
! "irus can enter the system and infect it through "arious sources. Some of the sources are
•
7nfected C+s% +B+s% pen dri"es% etc 0:mail
•
(rowsing infected sites
•
+ownloading #les from the internet
•
•
Steps to "emo#e Viruses
,emo"ing "iruses% though technical% is yet a "ery simple process if all the required steps are properly followed. he &asic steps are • •
• •
(uy or download an anti"irus softwareG!B !nti:"irus 7nstall the anti"irus software
?pdate anti"irus software with the latest "irus de#nitions +o a complete system scan
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+1 ; P a g e
#et;ods o! E%iminating Viruses ,emo"ing the "irus J /hen the "irus can &e easily identi#ed and can &e remo"ed without a>ecting other #les% then the anti"irus remo"es it from the host place. Kuarantine J his is done when the "irus cannot &e easily identi#ed remo"ed from the #le and the remo"al of "irus means the remo"al of the complete #le. 7n this method% although the "irus is not eliminated% it is rendered inacti"e &y mo"ing the #le into EquarantineE and renaming it. Anti
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+2 ; P a g e
Virus remova% E3uipment and #ateria%s: E3uipment System unit -onitor *ey&oard and -ouse #ateria%s !nti:"irus Software G!ny !nti:"irus software Birus remo"al Pro"ided with the necessary equipment and materials trou&leshoot the "irus infected area. 6ou will &e assessed using the following criteria Eva%uation: Passed
-ai%ed
CRI)ERIA 1.Periodic maintenance is o&ser"ed 2. Safety precautions are o&ser"ed. . !ppropriate materials are used in "irus remo"al.
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+6 ; P a g e
$. Computers =ormal function is con#rmed.
Program Course
Computer Hardware Servicing NCII
?nit of Competency
#aintain Computer S"stem and Networ$s
-odule
#aintaining Computer S"stem and Networ$s
9O. itle
Inspecting and testing computer s"stem and networ$s
Assessment Criteria: 1. 4inal inspection of the de"ice is instituted to ensure task perfection. 2. 9a&oratory management and maintenance are o&ser"ed to conform to company standard. . !ccomplishment report is deli"ered to concerned teacher after #nishing the task. Resources: E3uipment4-aci%ities
)oo%s 5 Instruments
Supp%ies 5 #ateria%s
Ser"er
Protecti"e eye wear
4loppy disk
Computer peripherals
/ire stripper with cutter
Compact +isk
+esktop computers OHS guidelines Phil. 0n"ironmental protection standards -onitors -other&oard
PliersG!ssorted Screw dri"ers G!ssorted Soldering irongun +e:soldering tool
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+8 ; P a g e
Power supply =etwork de"ice and ca&lings Hu&s Switches 9!= Cards Printers and Scanners ,outers ?S( 4lash +ri"es
4lashlight weezers -irrors !ntistatic wrist wrap 9!= ester Crimping tool Software installer /ork &ench -agnifying glass !llen key .R':.2' 7C insertione5traction tool ,S:22 pin insertione5traction tool
Re!erence: 1. -c9aughlin%,o&ert% Sasser%Susan% ,alston%-ary.4i5 6our Own PC.Philippine raphic !rts% 7nc andang Sora St.Caloocan City 2. -eralco 4aoundation. -icrocomputer Ser"icing Plus. Pasig City% Philippines. . 9egaspi%Carlos% CaiIa% -ark !nthony. Operate ! Personal Computer. +asmariIas Computer 9earning Center.+asmariIas%Ca"ite% Philippines $. (igelow%Stephen ). PC echnicianworks.com Q. www.microsoft.comtechnetnetwork
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+ ; P a g e
Computer S"stem and Networ$ Inspection #ateria%s )oo%s and E3uipment E3uipment: 2 Computer units Printer H?( Switch -O+0-,outer =etwork Ca&le 9!= ester -ulti:tester #ateria%s: /indows TP C+ installer /indows Q C+ installer !nti:"irus Software Computer -aintenance Software Hardware Inspection PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
+= ; P a g e
i"en the following tools and equipment% perform hardware inspection. Check the computers connection and con#guration and check for the "oltage output of the power supply. So!tware Inspection i"en the following materials% perform software inspection. Check for the > 1. Biruses 2. ?nnecessary software . +ri"ers are installed
Networ$ Inspection i"en the following tools% perform network inspection. Check the > 1. 4ile and printer sharing 2. 7nternet connection . Proper ca&le connection 6ou will &e assessed using the following criteria Eva%uation: CRI)ERIA
Passed
-ai%ed
Passed
-ai%ed
1. Sequence of steps. 2. O&ser"ance safety precautions. . Proper inspection of hardware components. $. Proper inspection of the power supply. Networ$ and Internet Inspection 6ou will &e assessed using the following criteria Eva%uation: CRI)ERIA
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
0@ ; P a g e
1. Sequence of steps. 2. O&ser"ance of safety precautions. . Proper inspection of network components. $. Proper inspection of network connection.
So!tware Inspection 6ou will &e assessed using the following criteria Eva%uation: CRI)ERIA
Passed
-ai%ed
1. Sequence of steps. 2. O&ser"ance of safety precautions. . Proper inspection of operating system. $. Proper "irus remo"al.
A!ter t;e inspection t;e student wi%% create an accomp%is;ment report to Be suBmitted to t;e teac;er9 Accomp%is;ment report Area to Be Inspected
ood running condition
(ad running condition
,emarks
HARDWARE S'-)WARE
PC HARDWARE SERVICING The Strengthened Technical-Vocational Education Program
0( ; P a g e