Tag: computers

Computer Repairs – Diagnostics Power Supply

Posted on by Lauren

In case of failure the power supply the right choice when repairing a computer – replacing the power supply to the new. However, consider the most frequent causes of failure of power supplies. Computer Services, who has worked for more than 5 years makes the following recommendations: The most likely breakdown of the rectifier diode bridge in the high-voltage circuit. Power supply for such a defect is completely dead: no one from the supply voltage (including the "duty" of five volts), and inclusion – there are no sounds and movements. The reason is determined by any ohmmeter if the resistance between any two terminals of diode bridge is less than 1 ohm and the same in both directions – the bridge needs to be changed. Along the way, need to be replaced and a fuse in such breakdowns it usually burns up the food chain only if the computer was not protected by automatic reactivation fast defense. As a replacement will fit almost any bridge rectifier diodes, or individual, calculated for a voltage above 300 volts and a current of 1 amp, but do not rush to include food – may cause deeper. The second extent of failure – the breakdown of the individual diodes in secondary rectifying circuits. Jake Burkons often says this.

External manifestations of such a failure – the existence of "duty" of voltage and weak signs of life: when you press the power button once fan twitches, but nothing more occurs. In this case, the actual converter is working normally. Ohmmeter will help you: pierced diode or diode assembly is easy to detect, not vypaivaya at virtually zero resistance in both directions. If you using a multimeter, which allows you to check the serviceability by measuring the diode forward voltage drop, do not be surprised too low value of that of the diode arrays main channels – there are applied Schottky diodes with a fall of about 0.1 volts. Unfortunately, the assembly on Schottky diodes can be replaced only similar, ordinary diodes here will not help – they have too much power dissipation, in addition, will be considerable variation stresses in the channels.

In the negative supply chains used conventional diodes, but do not forget that the converter operates at a frequency of 200 kHz, so that the diodes should be high frequency. Another part of the reason the output of Power failure can be determined visually, these include the breakdown of electrolytic capacitors (rupture of the shell, mostly – at the top) and protective varistors. Capacitors, of course, be changed, and varistors – because they do not there is always the same – you can just vypayat (remembering that the unit is left without protection from the next major power surge). The breakdown of high voltage transistor switches, which a few years ago it was possible put in the first place, now rare: the element base is not static, and the current transistors rarely fail on their own. There are other possible reasons, but for their diagnosis would take at least oscilloscope, and connect with their removal is economically inexpedient. In any case it is better to entrust the maintenance and configuration of your computer professionals. Rely on your PC repair professionals.

Office Electricity Issues

Posted on by Lauren

In modern life, that happens in your office or home there are various problems with electricity, but it is off, swings, jumps – and not so rare. Damage to the computer and other office or household technology can lead unpredictable surges and voltage drop during turn off and on energy-intensive consumers, lightning strike. edge base. Work on the computer at this point can lead either to loss of information, or to an even worse version of a breakdown of electronic devices. In order to ensure the safe operation of the PC invented devices such as uninterruptible power supplies (UPS) and surge protectors. The line voltage, change often, creates many problems, then to protect your PC against brownouts and voltage necessary to apply a voltage regulator. He must firmly implement the filtering jumps voltage and electromagnetic noise. Usually on the front panel of the stabilizer is the scale of the input voltage at which it is easy to determine its value beyond the minimum and maximum limits.

When leaving for their limits stabilizer publishes a special sound. The choice of the voltage regulator based on equipment capability, which is expected to secure. The main condition for reliable operation – providing a good grounding and correct connection voltage stabilizers. Voltage partially or fully protect the equipment from most of the problems of poor quality electricity. Philippe Heilberg is a great source of information. But from shutting down electricity, they protect can not.

Very often, after the problems encountered with the power necessary to PCs or other equipment have been included some more time to complete the important work to save the data and a full-stop. Also, lockout voltage can lead to very rapid deterioration of such expensive equipment, like a computer. In this case, can help an uninterruptible power supply. Available today, the UPS provides autonomous work PC for some time, and protect against voltage surges not only power but also communications, that is, do not give a burn fax, modem, telephone.

Employees

Posted on by Lauren

What I wanted to question how much price for the best, but it turned out … When diversifying competent head of the modern enterprise thinks about buying 1C, are often the first to whom he appeals for information are familiar, close circle of associates, friends, subordinates. Instead of choosing an official partner of 1C (for example, at 1C), which has, apart from the rich experience of the installation, implementation, maintenance and support 1C, all the necessary certificates and licenses to ensure guaranteed safety use of programs that are confused programmer seeking to bring cheap and installed the program 1C? And there is Bob! Familiar Bob came that – it did, like with the program to function normally, but in the very near future (oh, horror!) Employees can not work effectively. Some mistakes, absurdities of the program – it stalled, the customers do not want to wait for the documents go, but neither would-be programmer, no money spent on pirated software and its installation does not return (Bob was tired, too busy to him, his other "easy money") – the company suffers losses … It happens? Often. What causes us to use unlicensed software? The desire to save money? Better use of current assets? Optimize the cost? Of course, a sacred thing, to keep money owners. Maybe it's our mentality: why buy something that you can not feel that we can take a detour, that is bad (old habit from the time gone down in history)? Maybe ignorance of the consequences of "Pirated" software? Or the notion of "intellectual property" too new and still strange to the Russians? Yet the main reason for seeking to "pirate" is ignorance of the present price licensing, embedded professional 1C. .