Service computer networks

Network equipment of even the most well-known vendors simply cannot work forever without functionality failures. Whatever the guarantees and credibility of firms, after a while, sooner or later, the system fails. The causes of malfunctions in the perfect functioning of the equipment can be many factors, but timely service computer systems and networks allows you to reduce failures to a minimum. And also guarantees the protection of the network from unauthorized access and information leakage, increases the efficiency of its functions.

A computer network is a rather complicated structure that requires constant support in its work. The health of the network has an impact on the performance of the enterprise as a whole. Failures in the operation of a computer network lead to bad and undesirable consequences. For example, simple workflow, expensive network installation, material losses and stress.

The computer network itself is a structured cabling system (SCS). This is a whole hierarchy, divided into subsystems. SCS includes: modular jacks, cable connectors, cross-panels, connection cords, optical and copper cables, information sockets and auxiliary equipment. All of the above elements are interconnected and operated according to certain rules. SCS is the basis of the entire information structure at each enterprise, with the help of which many information services are combined: telephone, local computer network, security and video surveillance system. That is why SCS is of great importance when building a corporate system.

Installation and maintenance of computer networks starts with the purchase of accessories. Further, according to the designed model, the equipment and all workplaces are connected. Installation of SCS takes place in strict accordance with the calculations of the necessary working materials. After the acquisition of all materials, the installation of computer networks takes place. When the object is handed over, the testing process is carried out. Ideal if the project installation and maintenance of computer networks performed by the same IT service provider. But sometimes, the customer needs subscription service for previously installed network resources. Specialists of IT service companies will also help in this case, while a package is formed to modernize the existing computer network.

The full package of IT services is based on the IT outsourcing scheme - this is network system administration, maintenance computer technology, user support and PC subscription service. The most popular outsourcing direction is subscriber maintenance of computer networks which is in demand in many companies. In the course of computer maintenance, experienced specialists guarantee the elimination of any problems with computer equipment, carry out regular preventive maintenance and diagnose equipment.

Subscriber maintenance of computers and computer systems includes such works as support for the normal functionality of computers at the software and hardware levels, the entire range of preventive and diagnostic work in the functionality of information systems, organization and modernization of workplaces, and maintenance of servers. IT service company specialists perform remote administration of computer networks and train users in basic PC maintenance. It also ensures the operability of a computer network, configures and maintains active network equipment, and maintains a network of cables. Selected components and consumables, as well as software.

The operability of a local computer network mainly depends on the technical condition of all its components: the operability of all computers and the absence malware, the functionality of servers and network devices, the availability of constant and high-quality electrical power, the integrity of the cable network, and air conditioning in the right places. And it also depends on the qualifications of the employees of the enterprise and the right tasks to perform.

In order to do this, you need to obtain data on the number, configuration of computers on the network, installed software and linking to a building or office. To begin with, the tasks to be performed, the presence and number of servers and equipment, or software. Problems and all questions that have arisen during work are formed with the employees of an IT company, and tasks that require immediate resolution are selected. Next, the cost of the work required to perform the work is determined, and the purchase of the necessary equipment, if necessary. Professionals of the company providing services maintenance of local computer networks offer an integrated approach to solving issues related to the repair and creation of a network of any level.

Since the quality of the network is important, Maintenance computer networks has the following goals: to increase the service life of equipment, enterprise communications, including the maintenance of personal, server and terminal stations that are part of the organization of a computer network; installation of appropriate equipment, ensuring the required level of security for data transmission over communication channels.

Employees of the IT company conduct a preliminary inspection of the premises, find out the purpose of installing a computer system, and on the basis of this, a technical task is developed for implementation. Further, the project is drawn up and official documentation is agreed. Then the necessary equipment is delivered to the enterprise and installation is carried out. Highly qualified specialists during installation use both standard installation methods and developments of their own company. Due to this, the speed of installation is guaranteed, the high-quality setting of the local computer network. With the help of testing, IT specialists check the effectiveness of the applied solutions. When failures in the system are detected, the computer system is debugged at the highest level.

Implemented maintenance of computer networks FOCL, SCS and LAN. FOCL - fiber-optic communication lines, SCS - structured cabling system, LAN - local area networks. IT service specialists carry out the whole range of required activities.

As a result, the correct installation, configuration and further maintenance of the local network has an impact on the efficiency of the enterprise functionality. Extensive experience and professional approach of specialists guarantees operational installation and setting up computers and devices, taking into account the specifics of the client enterprise.

Design, installation and further subscriber service maintenance computer networks of the enterprise is carried out according to a strictly developed scheme. First, the company's specialist gets in touch with the client, the service provider goes to the site and makes an estimate. All installations and further maintenance of computer networks are carried out strictly in accordance with safety standards. An integrated approach to solving each task, and timely maintenance of computer networks ensures reliable and long-term use of resources.

Updated 05 Sep 2014. Created Jun 27, 2014

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Introduction………………………………………………………4

1. General information about the enterprise (history of creation, development and structure of the enterprise). ……………………………………………..five

2. Enterprise computer software. …………….7

3. Control of the technical condition of computer equipment and computer systems. …………………………………………….eight

4. Safety precautions at the enterprise. ………………………nine

5. Approximate content of the practice. ……………………………..

5.1. Special programs used in the enterprise for diagnostics and maintenance operating system and personal computer equipment. ………………………………….

5.2. . …….. 21

5.3. Application of computer equipment repair skills…. 22

Conclusion. ……………………………………………………………..26

Bibliography. ………………………………………………27

Appendix ………………………………………………..29

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PP.03 Maintenance and repair of computer systems and complexes

Developed

Vaseeva V.V

Check.

Mikhailov M.M.

N. Contr.

Mikhailov M.M.

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GOU SPO "ZabGK im. M.I. Agoshkov"

Gr. KS-13-1(230113

INTRODUCTION

The production practice took place from June 22 to July 4 at the enterprise ZabGK named after M.I Agoshkov. The director of the enterprise is Zykov Nikolai Vasilyevich, the deputy director of the enterprise is Efimenko Tatyana Ivanovna, the head of the practice is Mikhailov Mikhailovich.

The purpose of the internship is:

Familiarization with the activities of the enterprise;

To consolidate theoretical knowledge on all issues of maintenance of computer equipment;

Show primary professional skills in maintenance of computer equipment and computer networks;

At the beginning of the internship, there was a safety briefing. After passing the briefing, they got acquainted with the activities of this enterprise and studied its work, as well as consolidating and deepening the knowledge gained during training sessions.

Computers and information technologies are intensively developing in the spheres of material production. Specialists of various professions are increasingly using a computer in their workplace, as well as using information and communication technologies in their professional activities.

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1. GENERAL INFORMATION ABOUT THE ENTERPRISE (HISTORY OF CREATION, DEVELOPMENT AND STRUCTURE OF THE ENTERPRISE)

The formation of the Trans-Baikal Mining College as an educational institution that trains specialists for the mining industry dates back to 1917. In the distant 1917, full of political events of historical significance, when polytechnic courses were organized in the city of Chita with a mining department headed by mining engineer Banshchikov A.N. (“Zabaikalskaya Nov”, June 20, 1917).

• Since September 1917, it has become an independent mining department at the Polytechnic School. It was headed by mining engineer A.N. Banshchikov.
• In September 1947, the Polytechnic School received the status of a technical school and the name "Chita Mining College".
• In January 1994, the Chita Mining College, which was under the jurisdiction of Zabaikalzoloto JSC, was taken under the jurisdiction of the Ministry of Education of the Russian Federation.
• In August 1996, the Chita Mining College was under the jurisdiction of the Ministry of General and Vocational Education and was called the State Educational Institution of Secondary Vocational Education of the Chita Mining College.
• In September 1997, the Training and Course Combine (UCC) at the Chita Mining College resumed work for theoretical and practical training in professional training programs.
• In October 1998, the training and consulting center (UCP) in Krasnokamensk resumed its work to train mid-level specialists in correspondence courses at the PIMCU enterprise.

• In September 2002, a branch was created in Krasnokamensk on the basis of UKP.
• In September 2005, the Mining College became a college and acquired a new name Federal State Educational Institution of Secondary Vocational Education Zabaikalsky Mining College.

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• In May 2009, by order of the Federal Agency for Education dated May 27, 2009 No. 544, the institution was renamed the Federal State Educational Institution of Secondary Vocational Education

Transbaikal Mining College named after M.I. Agoshkova

• In October 2012, he became the Laureate of the competition in the nomination "100 Best Colleges of Russia" (St. Petersburg 2012)

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2. Enterprise computer software

During my internship, I worked with the computer labs of the college, in which there were from 10 computers for each classroom. When working with these computers, I studied their characteristics (which are given below). Basically, these computers are suitable for work in this area, since they mainly work with a standard package. Microsoft office(most often MSWord and MSExcel). And on these computers, programs for teaching computer literacy are used. Also, these computers do not have specialized or other software that does not meet the characteristics of this computer and does not require large resources.

Computer name: 302 - 1-9

Operating system: Microsoft Windows XP Professional SP 2 Language-Russian (standards: Russian)

Processor: IntelInsidePentium 4

Memory: 512 MBRAM

Version: DirectX DirectX 9.0

Current screen mode: 1024x768 (32bit)

Brand : LG Disk 3.5(A:) Yes

Disk (D:): For CD-RW

Disk Capacity: (C:) 80 GB

Videos card : VGA Tech Graphics. controller

Keyboard Standard keyboard: 101/102

Brand: Genius Mouse Optical NTFS File System

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3. CONTROL OF THE TECHNICAL CONDITION OF COMPUTER EQUIPMENT AND COMPUTER SYSTEMS

Computer technology in the educational institution is in excellent condition.

All computers have been updated and replaced recently, many of them have been replaced with parts that greatly increased the performance of the PC. System administrators monitor the state of all equipment located in the Mining College. At the moment, many PCs do not require any investments. The technical condition of monitors, printers, system units, as well as other peripheral devices are under control. In the event of a breakdown of computer equipment, measures are immediately taken to eliminate all problems. If necessary, replace RAM, hard drives, motherboards, video cards, if these components cannot be repaired.

Technical condition of computer networks.

On the second floor, almost all classrooms have Internet access and are currently in excellent condition, which allows students and college staff to access the Internet without much difficulty. On the first, third and fourth floors there is also Internet, but partially. All cables are insulated and protected by special protective cases. If there is any breakdown in the network, it is eliminated without much effort. The main focus is only on software for convenient operation on PC.

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4. SAFETY AT THE ENTERPRISE

Before you start repairing your computer, perform the following steps in the order listed:

1. Turn off your computer and all peripherals.

2. Before touching the inside of the computer, touch an unpainted metal surface on the computer chassis, such as the metal trim around the card slot opening on the back of the computer. During operation, periodically touch an unpainted metal surface of the computer case to dissipate static electricity that can damage internal components.

3. Unplug your computer and peripherals from electrical outlets. You should also disconnect your computer from all telephone and communication lines. This reduces the risk of injury or electric shock.

In addition, always follow the following safety precautions:

When disconnecting a cable, pull it by the plug or by the special loop, but not by the cable itself. Some cable connectors are equipped with locking tabs: when disconnecting these cables, press the locking tabs before disconnecting the cable. When disconnecting the connectors, try to space them in a straight line so that the contacts do not bend. Also, make sure both connectors are correctly oriented and aligned with each other before connecting the cable.

Handle components and boards with care. Do not touch components or pins on the board. Hold the card by the edges or by the metal mounting plate. Handle electronic components, such as a microprocessor, by the edges, not by the pins.

Caution: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with the same type or as recommended by the battery manufacturer. Dispose of used batteries according to the manufacturer's instructions.

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5.PP.03. MAINTENANCE AND REPAIR OF COMPUTER SYSTEMS AND COMPLEXES

5.1 Special programs used at the enterprise for diagnostics and maintenance of the operating system and personal computer equipment.

Plan.

1. .
   1. basic software
   2. OS
   3. utility programs
2. .

Under software(Software) is understood as a set of software and documentary tools for the creation and operation of data processing systems by means of computer technology. In the most general terms, computer software can be divided (depending on the purpose) into systemic, instrumental and applied (like any classification, this division is conditional).

Software is either data for use in other programs, or an algorithm implemented as a sequence of instructions for a processor.

Software called upon:

Ensure the performance of the computer;

Facilitate user interaction with the computer;

Expand the resources of the computing system;

Improve the efficiency of resource use;

Increase the productivity and quality of the user's work.

In computer jargon, the word " software » from English software , which was first applied in this sense in the American Mathematical Monthly paper by Princeton University mathematician John W. Tukey in 1958. In the field of computing and programming, software is the totality of all information, data, and programs that are processed by computer systems.

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System softwareis a set of programs that provide effective control of the components of a computer system, such as a processor, RAM, input-output channels, network and communication equipment, etc.System softwareorganizes the process of information processing in a computer and provides a normal working environment for application programs; it is designed to control a computer, organize problem solving and user interaction with computer hardware. It is so closely related to the hardware that it is sometimes considered part of the computer. The richer the system software, the more productive the work on the computer becomes.

The system software includes operating systems, service software (shells, utilities, anti-virus tools) and maintenance programs (test programs, control programs).

Basic software.

Basic software occupies a special position in computer architecture. On the one hand, it can be considered as an integral part of the hardware, on the other hand, it is one of the software modules operating system.

Operating system.

Operating system(OS) is a set of special software tools designed to control the boot of a computer, the launch and execution of other user programs, as well as to plan and manage the computing resources of a personal computer. It provides control over the processing of information and interaction between the hardware and the user.

Operating system features include:

• dialogue with the user;
• input, output and data management;
• planning and organization of the program processing process;
• distribution of resources (RAM and ultra-fast memory, processor, external devices);

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• launch programs for execution;
• all kinds of auxiliary maintenance operations;
• transfer of information between different internal devices;
• software support for peripheral devices.

The main need of the OS is that it hides complex unnecessary details of interaction with the hardware from the user, forming a layer between them.

One of the most important functions of the OS is the automation of the processes of input-output of information, the management of the execution of applied tasks solved by the user.

Based on the functions performed,OS can be divided into three groups: single-tasking (single-user), multi-tasking (multi-user) and networked.

Single task OS are designed for the work of one user at any given moment with one specific task. Their appearance was stimulated by the creation of a large class personal computers. An example of such an OS is the operating system MS DOS widely used until the early 1990s.

Multitasking OSprovide for the collective use of a PC in a multi-program time-sharing mode, while the PC memory contains several task programs and the processor distributes computer resources between tasks. An example is operating systems. UNIX, OS/2, Microsoft Windows 95, Microsoft Windows 98, Microsoft Windows 2000, Microsoft Windows Me, Microsoft Windows XP.

Network OS associated with the advent of local and global networks and are designed to provide access to all computer network resources, such as operating systems Novell Net, Microsoft Windows NT, UNIX, IBM LAN.

Depending on the number of simultaneously processed tasks and the number of users,that can serve the OS, there are four main classes of OS:

Single user single task: support one keyboard and can only work with one (at the moment) task;

Single user single task with background printing, which allow, in addition to the main task, to run one additional one, focused on printing information. This speeds up the work when issuing large amounts of information for printing;

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single user multitasking, which provide one user with parallel processing of several tasks;

multi-user multi-taskingallow several users to run multiple tasks on the same computer. These operating systems are very complex and require significant machine resources.

To be complete, an OS must contain at least the following main components.

file system.

Drivers for external devices.

Command language processor.

One of the primary tasks of the operating system is toread disk drive management and access to it. It is no coincidence that early PC operating systems contained the abbreviation DOS (Disk operating system disk operating system). For this, the file system is used. Any application program has access to the file system, for which all programming languages ​​have special procedures. For a PC, the file system is, to a certain extent, the basis of system software.

Support for a wide range of external devices is one of the most important functions of the OS.

In modern operating systems, there is an intermediate level between application programs and hardware, a kind of buffer called API (application programming interface) application programming interface). API gives the programmer the ability to call certain procedures general purpose that access specific hardware resources. As new equipment becomes available, it is updated and API , however, this may not be enough.

Correct work with the hardware is provided by drivers. Drivers programs that expand the capabilities of the OS to manage input / output devices, RAM, etc. With the help of drivers, it is possible to connect new peripheral devices or non-standard equipment to the computer. Each type of external device has its own driver. Standard device drivers form a set of basic input/output system (BIOS) that are often stored in ROM system block PC.

Every OS has a command language that allows you to perform certain actions accessing a directory, launching application programs, etc. The analysis and execution of user commands is carried out by the OS command processor.

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To communicate with the OS, a shell is often used this is what the user sees on the monitor screen when working with the system.In essence, this is a kind of application program that is loaded on top of the OS and implements a command language that serves to provide user access to system functions. The shell is just a kind of utility for entering information that provides convenient access to the operating system, but it is not part of the OS.

File management and job scheduling programsthese are programs (files) ready for execution: utilities, programming systems, tool systems, integrated software packages, computer graphics systems, database management systems (DB), application packages and programs.

Communication programsprograms designed to organize the exchange of information between computers.

Testing, control and diagnostic programsare used to check the correct functioning of computer devices and to detect malfunctions during operation, indicate the cause and location of the malfunction.

Memory management programsprovide more flexible use of OP computers.

Print programsoutput information to the printer.

Service programs.

Other set of programs official . This is a set of software products that provide the user with Additional services in working with a computer and expanding the capabilities of operating systems.These are various utility programs used during the operation or maintenance of a computer - editors, debuggers, diagnostic programs, archivers, anti-virus programs and other auxiliary programs. These programs make it easier for the user to interact with the computer. They are adjoined by programs that ensure the operation of computers on the network. They implement network protocols information exchange between machines, work with distributed databases, teleprocessing of information.

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Under maintenance programsrefers to a set of software and hardware tools for diagnosing and detecting errors in the operation of a computer or a computing system as a whole.They include diagnostic tools and test control of the correct operation of the PC and its individual parts,as well as special programs for diagnostics and control of the computing environment, which carry out automatic check system performance. These programs are used to test the performance, adjustment and technical operation of computer equipment by the personnel who serve it. The results of the work of such programs are displayed in a visual form and can be useful to a user with a qualification not lower than a computer operator.

Utilities auxiliary programs, they expand and complement the corresponding capabilities of the operating system (OS)mainly for disk maintenance and file system computer.

packers programs that allow you to write information on diskettes in a denser form, that is, create smaller copies of files, as well as combine several files into one (archive).

Antivirus programsprograms designed to prevent infection with computer viruses and eliminate the consequences of infection.Antivirus protection softwareprovide diagnostics (detection) and treatment (neutralization) of viruses. The term "virus" refers to a program that can multiply, infiltrating other programs, while performing various undesirable actions.

Application software

Application softwaredirectly aimed at solving professional problems, reducing labor intensity and increasing the efficiency of the user in various areas of human activity. These programs allow you to almost completely automate the tasks solved by the user. The programs of this group are very diverse: from simple programs text information processing to powerful publishing systems; from solving simple computational problems to powerful professional systems of mathematical calculations, accounting programs.

Currently, hundreds of thousands of different application programs have been developed and are being used for various applications. The most widely used programs are:

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• preparation of texts (documents) on a computer text editors;
• preparation of documents of typographical quality publishing systems;
• creating and editing images graphic editors;
• tabular data processing spreadsheets;
• processing of information arrays database management systems;

Text editorsand publishing systems provide the ability to prepare documents on a computer. Text editors (NotePad - developed by Microsoft) are capable of performing basic editing functions: typing, making corrections, saving, working with fragments. Word Processors ( Microsoft Word, - developed by Microsoft), in addition, they have the possibility of a variety of design, and some allow you to create documents intended for viewing not in paper form, but on a computer (electronic documents). Publishing systems automate the process of layout of printing publications. Publishing systems are distinguished by advanced controls for the interaction of text with page settings and graphic objects, but have weaker capabilities for automating text entry and editing. It is advisable to apply them to documents that are pre-processed in word processors and graphic editors.

Spreadsheetsprovide work with large tables of numbers.Main purpose spreadsheets- processing of various types of data presented in tabular form, for example, planning and financial, accounting documents, small engineering calculations. The main advantage of spreadsheets, compared to word processors (where tables can also be maintained, small calculations and sorting can be done), is that the content of some cells can automatically change in accordance with the change in the content of others, in other words, formulas can be stored in the cells. In addition, spreadsheet editors have the ability to maintain small bases data and data visualization in the form of various tables, charts and graphs, i.e. spreadsheet tools, tabular calculation tools are supported by the ability to create visual reports. They find wide application in accounting, analysis of financial and trade markets, means of processing the results of scientific and economic experiments, i.e. in automating regularly repeated calculations of large amounts of numerical and textual data representing tabular structures. The most popular spreadsheet editors are Lotus1-2-3 Quatto Pro, Microsoft Excel, Super Calc, etc.

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Database management systems(DBMS) allow you to work with large amounts of structured data - databases (as a rule, these are tabular structures). The functions of the DBMS include: description of data, access to data, search, selection of data according to certain criteria. Most modern DBMS allow you to create small data processing programs in built-in languages, have design features that allow you to create a report based on the collected and processed data. Even low-skilled users can easily work with such DBMS, since all actions in them are carried out using menus and other interactive tools. However, it is often necessary to solve problems involving many different types of objects and, accordingly, many information arrays related to each other by various relationships. In such cases, it is necessary to create specialized Information Systems, in which necessary processing data is processed in the most natural way for users with a convenient presentation of input data, output forms, graphs and charts, search queries, etc. To solve such problems, more complex DBMS are used, which allow using special tools (usually programming languages) to describe data and actions with them. An example program of this class is Microsoft Access.

Graphic editorallow you to create and edit pictures on your computer screen. These include raster and vector graphics editors, 3D graphics processing programs (Z D - editors). Bitmap editors use bitmaps to represent images, i.e. a collection of dots that have their own color and brightness. It is convenient to process photos and objects with soft color transitions in them. The basis of the vector representation is the line (its equation). Vector editors convenient for working with drawings and hand-drawn pictures. Three-dimensional graphics editors are used to create spatial graphic compositions, allow you to trace the interaction of three-dimensional objects with each other and three-dimensional objects with a light source.As a rule, the user is given the opportunity to draw lines, curves, color areas of the screen, create inscriptions in various fonts, etc. Most editors allow you to process images obtained using scanners, as well as display the resulting images in such a way that they can be included in a document prepared using text editor or publishing system. Some editors provide the ability to capture images of three-dimensional objects, convert raster images to vector format, professional color processing tools, etc.

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Solution softwareapplied mathematical(statistical) problems allow you to perform mathematical calculations: solving equations and systems of equations, etc., some packages allow you to perform analytical (symbolic) calculations: differentiation, integration, etc. Some of them allow you to display graphs of functions (given in tabular or analytical form), surface level lines, scatterplots, etc.. K this species Software includes programs such as matcad, matlab.

Separate programs, being a powerful tool for solving a range of applied problems, cannot fully satisfy the user. For example, it can be convenient to process a data sample provided by a DBMS using spreadsheets; the results, presented in the form of visual tables, can be placed in a report, which is a text document; which was compiled in a word processor. For the joint work of several programs, the unification of the formats of the processed files is also required. Such software packages are calledintegrated software. The most common product of this class is the package MS office. Integrated systems combine the capabilities of a database management system, a spreadsheet, a text editor, a business graphics system, and sometimes other capabilities.

translators usually work resident, i.e. in any text in a foreign language, you can highlight the fragment to be translated, and after pressing a certain key combination, a window with the translation or possible translation options for the word is presented.

Games very common, a huge number of them have been created. Among them, the following typical scenarios can be distinguished: proactive games (for mastery), gambling, strategies, logic games, educational games.

Entertainment — application programs, allowing you to view slides, listen to sound files, video files.

The solution of narrower tasks, as well as tasks of a professional nature in various subject areas, is handled by special-purpose application software, which includes: information systems, expert systems, computer-aided design systems, etc.

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Information Systems(IS), provide ample opportunities in:

Enterprise management is a warehouse, office workflow;

Accounting - these are systems that have the functions of text, spreadsheet editors and DBMS. Designed to automate the preparation of initial accounting documents, enterprises and their accounting, regular reports on the results of production, economic and financial activities in a form acceptable to tax authorities, non-budgetary funds and statistical accounting authorities;

Analysis of economic and financial activities; they are used in banking and exchange structures. They allow you to control and predict the situation in the financial, trade and raw materials markets, analyze current events, and prepare reports.

Expert systemsrepresent a further development of database management systems. They are designed to analyze data stored in knowledge bases. Unlike DBMS, which allow data manipulation operations, expert systems perform logical data analysis and have self-learning functions.

Computer-Aided Design Systemsallow drawing and designing various mechanisms using a computer, they are used in mechanical engineering, construction, architecture. They allow you to create drawing documentation adapted to a specific subject area, and also have reference books, calculation tools. Widespread programs such as AutoCAD, ArchCaAD, etc.

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5.2 maintenance and repair of computer systems

Unstable operation of the computer can happen due to malfunctioning coolers. The second reason for a malfunction of the computer is the breakdown of the power supply. A malfunction of the power supply can manifest itself as visible and hidden. With a visible malfunction of the unit, the computer does not show any signs of operability when turned on, the coolers do not work and the LEDs do not shine. With a hidden malfunction of the unit, unstable computer operation, sudden system freezes, spontaneous reboots, and errors during operation are observed. The power supply is the most loaded part of the computer and, in addition, is subjected to additional influences due to network instability in the form of natural voltage surges and natural ones during a thunderstorm. Therefore, it is recommended to turn off the computer and turn off the power during a thunderstorm. You can work on a laptop during a thunderstorm provided it is powered by a battery and connected to the Internet via Wi - Fi .

A malfunction causes the computer to become unstable random access memory RAM. Even positive results of testing by special programs cannot 100% guarantee that the memory is working, and the only way to verify the reliability is to replace the memory bar with a known good one. If there is more than one bar, then taking out one at a time, you can thus perform a check. If there are no failures, then the removed memory bar is to blame.

There are cases of instability computer hard disk (hard drive). But, as a rule, if the hard drive malfunctions, even before the systems start loading, an error message is displayed about reading from the disk. Sometimes the hard drive starts making sounds. If the system boots and there is a suspicion of a hard drive malfunction, then you need to test it for bad sectors and set a ban on writing to these sectors. After a while, check again if new bad sectors appear, then the hard drive will have to be replaced.There are programs that allow you to physically make a copy of the hard drive installed in your computer to a new one, of any capacity. Then you do not have to spend time reinstalling programs and drivers.

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5.3 application of computer equipment repair skills

The most complex and responsible work of an employee of the maintenance department is the repair and maintenance of computers, so we will consider in detail the search and elimination of their malfunctions.

Computer breakdowns are usually divided into two groups: hardware-related and software-related. The first step is to determine which group of faults each specific case belongs to.

Hardware-related problems usually manifest themselves even before the operating system loads. Some of them can be detected using the so-called POST messages. The process of loading a computer begins with self-diagnosis, during which breakdowns are searched for hardware. After that, special messages are sent to the user that indicate the health or malfunction of computer components. The decoding of these messages can be found in the motherboard manuals or on the manufacturer's website. BIOS . Table 1, are given for example POST popular BIOS AwardBIOS, which sends its messages as beeps.

Table 1 - AwardBIOS beeps

One short beep	Successful POST testing
Single signal with no picture	Video card failure
One long and one short beep	RAM problems
One long and two short	Incorrect monitor connection or video card malfunction
One long and three short beeps	Keyboard testing error, controller malfunction
One long and many short beeps	Non-alternative BIOS corruption option
Two short	CMOS settings failure, or some non-critical error
Three long	Motherboard failure
Permanent long	Incorrect connection or memory failure, or inconsistency with motherboard
Permanent short	Power supply is defective
Complete absence any signals	Power supply is defective

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It should be noted that in modern motherboards it is possible to withdraw POST messages to the LED indicators built into the board.

After receiving the corresponding signal, it is necessary to replace the defective part.

However, you should not rely entirely on the computer's self-diagnostic capabilities, as they only allow you to highlight critical errors in the equipment. It is impossible to isolate such malfunctions as, for example, a violation of the heat sink of the processor or video card.

After the computer passes self-diagnosis, the operating system starts loading. At this stage, most often, either a damaged hard drive or a damaged area makes itself felt boot disk. The computer screen usually displays an inscription about the impossibility of downloading from hard drive. In this case, it is necessary to check the hard drive with the appropriate software. If the tests pass successfully, you must either reinstall or try to restore the computer's operating system.

After loading the operating system, software-related errors most often manifest themselves. Their range is so large that it requires consideration in each individual case.

Consider the symptoms of hardware problems that manifest themselves after the operating system has started.

If artifacts appear or the image disappears, then this indicates errors associated with the video subsystem. In some cases, reinstalling the video card drivers can help, in others it may indicate, for example, damage to the video memory or graphics processor.

If file reading errors are observed, then this undoubtedly indicates a malfunction of the data storage system.

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Errors that appear during the execution of the program sometimes indicate a malfunction of the RAM. It is recommended to check it with the appropriate software.

If the computer spontaneously restarts or freezes under the load of calculations, this may indicate a malfunction of either the central processor or its cooling. At the same time, one should not lose sight of the fact that errors of this kind can appear due to a malfunction, or insufficient power of the power supply.

An important part of the operation of the computer is its prevention in order to maintain health and speed.

Prevention is better to start with an external examination of the computer. Make sure that the computer case is not damaged or dented. Next, remove the housing cover and remove dust. This can be done either manually, for example, using a brush, or using a special installation. A similar installation is shown in Figure 3. It is successfully used in the maintenance department of the ITC.

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The installation consists of a hood, a semi-closed box and two vacuum cleaners. It is recommended to remove as many components as possible, in this case, the cleaning can go better. The first step is to suck up the dust, and blow out the rest. After this treatment, you can wipe the case with a dry cloth.

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CONCLUSION

She did an internship at an educational institution ZabGK them. M.I. Agoshkova

At the beginning of the industrial practice, she got acquainted with the activities of the college and its employees. Received a safety briefing. During the practice, she mainly worked with the replacement of parts and the installation of programs.

During my internship, I gained experience in PC repair. I consolidated and improved my knowledge while working with programs. Performed tasks: reinstalling the OS, replacing the components of the system unit, as well as replacing and repairing external devices. Work at the enterprise gave practical skills of a programmer technician. I really liked working in a close-knit team. This practice is very useful for further study and work, as a lot of skills, knowledge and skills have been obtained.

Thus, the work experience is a test of the knowledge gained during the training, and the opportunity to learn a lot about your profession.

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PP.03 Maintenance and repair of computer systems and complexes

BIBLIOGRAPHY

Braude, E. D. Software development technology / E. D. Braude. - St. Petersburg: Peter, 2010. - 260s.

Gagarina, L.G. Software development technology / L.G. Gagarina, E.V. Kokoreva, B.D. Visnadul; edited by Professor L. G. Gagarina. M.: - FORUM, 2011. - 315s.

Gagarina, L.G. Development and operation of automated information systems: textbook. allowance / L.G. Gagarina, D.V. Kiselev, E.L. Fedotova; ed. prof. L.G. Gagarina. - M.: ID Forum: Infra - M, 2013. - 384 p.

GOST 34.602-89 Terms of reference for the creation of an automated system.

GOST 19.201-78 Terms of reference. Requirements for content and design.

Leonenkov, A. V. Self-tutor UML / A.V. Leonenkov. - St. Petersburg: BHV, 2010.-304p.

McConnell, S. Perfect Code / S. McConnell. - St. Petersburg: Peter, 2010.- 896s.

Olifer, V.G. Computer networks. Principles, technologies, protocols / V.G. Olifer, N.A. Olifer. - St. Petersburg: Peter, 2012. - 960s.

Popov, I.I. Computer networks: Textbook for students of institutions of secondary vocational education / I.I. Popov, N.V. Maksimov - M.: FORUM: INFRA-M, 2011. - 448s.

Homonenko, A.D. Databases: textbook for higher educational institutions / ed. HELL. Homonenko. - St. Petersburg: Korona-Vek, 2010. - 416 p. Popov, I.I. Computer networks: a textbook for students of institutions of secondary vocational education / I.I. Popov, N.V. Maksimov - M.: FORUM: INFRA-M, 2013. - 516 p.

Olifer VG, Computer networks. Principles, technologies, protocols / V.G. Olifer, N.A. Olifer. - St. Petersburg: Peter, 2012. - 685s.

Gagarina, L.G., Development and operation of automated information systems: textbook. allowance / L.G. Gagarina, D.V. Kiselev, E.L. Fedotov: ed. prof. L.G. Gagarina. - M.: ID Forum: Infra - M, 2010. - 384 p.

Homonenko, A.D. Databases: a textbook for higher educational institutions / A.D. Homonenko, V.M. Tsygankov, M.G. Maltsev: ed. HELL. Homonenko. - St. Petersburg: Korona-Vek, 2010. - 416 p.

Additional sources:

Basakov, M.I. Certification of products and services with the basics of standardization and metrology / M.I. Basakov. - St. Petersburg: Peter, 2013. - 256s.

Blagodatskikh, V. A. Standardization of software development / V. A. Blagodatskikh, V. A. Volnin, K. F. Poskakalov. - M.: Finance and statistics, 2012. - 288s.

A practical guide for smart users and novice developers / A. Bondar. - St. Petersburg: BHV-Petersburg, 2011. - 592s

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computer Borri, H. Firebird : database developer's guide / H. Borri. - St. Petersburg: BHV-Petersburg, 2013.- 1104 p.

Vendrov, A.M. Designing software for economic information systems / A.M. Vendrov. - M.: Finance and statistics, 2014. - 180s.

Grekul V.I. Design of information systems. http://www.intuit.ru

Hooke, M. Hardware local networks: Encyclopedia / M. Guk - St. Petersburg: Peter, 2011. - 576s.

Kovyazin, S. Mir InterBase / S. Kovyazin, S. Vostrikov. - M.: KUDITS - IMAGE, 2013. - 496 p.

Lavrovich, V., Kostyuchenko, A. Consumer Rights Protection Standards // Standardization. - 2011.- No. 5.- C.45-47

Lipaev, V. Selection and evaluation of software quality characteristics. Methods and standards / V. Lipaev. - M.: Sinteg, 2012. - 228s.

Olifer, V.G. Fundamentals of data transmission networks: a course of lectures / V.G. Olifer, N.A. Olifer. - Internet University information technologies-INTUIT.RU, 2012.

Sorokin, A.V. Delphi . Database development / A.V. Sorokin. - St. Petersburg: Peter, 2010. - 2011. - 477p.

Bondar, A. InterBase and Firebird. A practical guide for smart users and novice developers / A. Bondar. - St. Petersburg: BHV-Petersburg, 2011. - 592 p.

Borri, H. Firebird : a database developer's guide / H. Bori. - St. Petersburg: BHV-Petersburg, 2012.- 1104p.

Vendrov, A.M. Design of software for economic information systems / A.M. Vendrov. - M.: Finance and statistics, 2012. - 180s.

Kovyazin, S. Mir InterBase . Architecture, administration and development of database applications in InterBase/Firebird/Yaffil / S. Kovyazin, S. Vostrikov. - M.: KUDITS - IMAGE, 2013. - 496 p.

Informational resources:

Magazine sites	Programmer Access mode: http://jurnal-programmist.at.tut.by/ open systems Access mode: http://www.osp.ru
educational sites	1. Internet University of Information Technology Access mode: http://www.intuit.ru
Portals	1. Information and communication technologies in education Access mode: http://www.ict.edu.ru

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PP.03 Maintenance and repair of computer systems and complexes

APPENDIX 1

Structure of ZabGK

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PP.03 Maintenance and repair of computer systems and complexes

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ComputersLife offers professional installation, configuration and maintenance of computer systems and networks in St. Petersburg.

It often happens that the local network stops functioning at the most inopportune moment, or some malfunctions and malfunctions occur that disrupt the workflow. If the company has a full-time system administrator, you can contact him. However, a full-time system administrator is not always able to solve the problem that has arisen, especially when it comes to simple work and help is needed not only professional, but also as prompt as possible. After all, all the work of the enterprise stops, repairs are often delayed, and the problem remains unresolved, which entails a number of troubles, including financial ones. If there is no system administrator in the company at all, they often resort to friendly relations, calling acquaintances who are somehow connected with the IT field, which is natural, but rather, even more so, is not the best option problem solving.

Such unpleasant situations are impossible in organizations where outsourcing services are used by companies whose specialization is network maintenance. Outsourcing maintenance of computer networks is a service that has many advantages. And among the main advantages, first of all, it is worth noting the significant savings of your funds. The cost of performing work, including the maintenance of computers and networks on the basis of a contract, is more economical than the maintenance of full-time specialists.

The local network is a complex system that should only be trusted by a professional with good experience. ComputersLife successfully operates in the IT services market and has rich experience in this field of activity. Having concluded a contract with us for the provision of services - maintenance of a computer network, you can be sure that your company will always receive timely repairs to the network, servers, and computers, and everything necessary will be done to normalize and optimize their work. Also, if necessary, in addition to the subscriber service, you can order local network maintenance as a one-time job. After all, in any company where the number of workstations equipped with computers exceeds one, the question arises of transferring data between computers and setting up a local network between machines is required.

ComputersLife guarantees the high quality of the service provided. Our specialists provide services for the repair and configuration of networks, software, perform system administration, perform work on the acquisition and installation of components, and much more. In addition, each ComputersLife client can always count on detailed advice and competent recommendations on optimizing and developing the computer system of their enterprise. With ComputersLife, problems in your company's local network are excluded!

ComputersLife is a wide range of services and operational work in all areas of the city.

Computer network maintenance includes:

• if necessary - designing a corporate computer network;
• equipment diagnostics;
• setting up a computer network;
• preventive work;
• timely network upgrades.

Calculate the cost Examples of completed work

Customer Reviews

Heinonen A.S. General Director of Svoy Klimat LLC

The Svoi Klimat company expresses its gratitude to the Optimal Service company and personally to Sergey Alexandrovich Komkin for the excellent work done in assembling our server, installing software and installing our company's local network. All work was carried out neatly, efficiently and on time, taking into account all the wishes. The installed equipment has been functioning without failures for more than 1.5 years. Employees of the company respond in a timely manner to emerging questions and promptly help with the software.
We recommend the company "Optimal Service" to our colleagues and partners.

Kokoreva E.S. General Director of LLC "Inzhkom and K"

OOO "Inzhkom" has been a client of OOO "Optimal Service" since the beginning of 2009.
During these three years, there were no negative emotions in relation to the employees of "Optimal Service". They always respond promptly, solve problems quickly and professionally.
We look forward to further cooperation with this company.

Professional maintenance and configuration of a computer network is an important condition for ensuring the efficiency of almost any organization. It is difficult to imagine a modern company or enterprise without a developed computer structure. Today, the basis of any business is information technology, which brings to the fore the competent design and maintenance of computer networks.

LLC "Optimal Service" offers you professional maintenance of corporate computer systems and networks. CEOs who consider these services superfluous are making a big mistake. They compromise the security of the entire system and its underlying data. The lack of prompt and competent technical support leads to breakdowns and malfunctions of the corporate computer network. Incorrect operation of networks is a decrease in productivity, and sometimes a complete stop of production.

We offer our services in St. Petersburg at a bargain price. Remember that a high price is not always a guarantee of quality service. In our work, we optimally combine professionalism and affordable prices.

Setup and maintenance of corporate computer networks

Maintenance of corporate computer networks consists of several stages:

• equipment diagnostics;
• connecting and setting up new equipment;
• setting up the user's PC;
• carrying out preventive work;
• network upgrades.

The list of computer network maintenance services also includes:

• replacement of passive equipment;
• professional advice of company employees.

Note that the initial design of a computer network also plays an important role.

Maintenance of local computer networks

A local network is one of the most important parts of the IT structure of any enterprise. It is with its help that data is exchanged between computers, access to the necessary information is opened. The local area network provides coordination of all computer networks of the enterprise or office.

Maintenance of local computer networks includes the following services:

• setting up a local network;
• diagnostics, troubleshooting;
• ensuring the security of the network;
• setup, installation network equipment, updating and replacing software.

In addition, our company is engaged in setting up network communications and providing Internet access. The maintenance of local computer networks also includes professional consultation and text works systems.

In order to find out detailed information about the maintenance of computer networks, you need to contact us by contact numbers. You can also send us a message to an email address.

We guarantee you the efficiency of work, the possibility of an urgent call, as well as the high professionalism of our employees, an individual approach to each client.

It is impossible to imagine a metropolitan office that is not equipped with a local area network. And this is not a tribute to fashion or following some kind of virtual trend - since computers today are used by young and old. A local area network (LAN) or a computer structured network (LCN) has become as essential to optimal workflow and business development as a bank account or a company's registered office. As a business card, the largest corporations, the most famous brands or an office for five to ten employees use the corporate website with the same care, on which various company services maintain thematic pages. Not to mention such a ubiquitous function as the salary of employees, which the accounting department, using again - a local network with Internet access, transfers to bank cards.

What is a local area network used for?

We have already noted that a local area network (LAN or SCS) is used by various companies for efficient business and economical distribution of work resources.

1. The interaction of various departments of the company and employees when working on common projects or the task assigned to them.
2. For efficient use of expensive and costly peripheral technical equipment (printers, scanners, additional servers for storing large amounts of information).
3. To create a single database and other information resources with distributed access for employees by categories and areas of responsibility.
4. For the constant interaction of some departments (for example, accounting) with external systems(banking) and conducting various operations via the Internet.
5. To combine various communication services into a single hardware system. For example, telephone operators and managers providing certain services to the end user; telecommunications networks and video surveillance networks, etc. etc..

Necessary Precautions When Using a LAN or SCS

As soon as you have connected all the computers in your office into a single local network and have access to the Internet, the question arises about the security of the company as a whole and the economic tasks it solves. When you have Internet access, the Internet also has access to information stored on your computers and additional servers. Yes, any modern computer or the server has its own software to implement security measures and keep data private from accidental intrusions. But just from random!

Any intruder fully understands the complexity of the architecture of computer security systems and is well aware of their capabilities. Therefore, it is important not only to have sufficiently serious technical equipment and software to implement business security measures. It is important to initially correctly configure the local network, configure the equipment according to the individual needs of the company and carry out regular maintenance. By the way, network maintenance is no less responsible and complex work from an engineering and software point of view.

Subscription service of computer systems (IT outsourcing)

In addition to the fact that the computer network of any company must be safe from external encroachments, both accidental and purposeful, the computer network must certainly have guaranteed information stability and provide the entire company with the possibility of uninterrupted operation. Such a network is initially laid down with some redundancy for subsequent scaling. What does it mean? When a company develops or rebuilds, slightly changes the direction of its business, finds new markets, etc. This always leads to the installation of new, additional equipment or its relocation within the same local network. To ensure that such operations do not take much time and do not lead to significant costs, the network is initially planned, from its architecture to network components, with some redundancy, which includes more reliable cables and network equipment that can handle its greater load.

The most reasonable offer from IT specialists today is its subsequent guaranteed, post-guaranteed maintenance - information technology outsourcing. This is always much cheaper and never leads to force majeure if the network "falls" and it is impossible to carry out the workflow in the usual mode due to its absence.

What is included in the maintenance of local networks

Any local computer network consists of the following main elements:

• cable (shielded and unshielded);
• network equipment (switches, hubs, routers, PoE adapters, etc.);
• software (software).

All these parts of a computer network must work seamlessly and smoothly, be adapted to each other and not cause problems when additional network devices interact with them. Therefore, IT-PING, when laying and configuring computer networks, plans in advance and calculates all possible options for scaling and changing the configuration for each system individually. Includes:

• monitoring the operation of the local network of your enterprise;
• the ability to visit an IT specialist and troubleshoot at any time;
• security and organization of anti-virus protection;
• software update;
• setting up and upgrading both the network equipment itself and the workstations of your enterprise;
• remote consultations, personnel training.

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