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Hardware Articles

Hardware Articles





What Is A Fuse? And How To Test It.

A fuse is a very thin wire, which either melts or vaporizes when too much current flows through it. The thin wire may be made of aluminum, tin-coated copper or nickel. The resulting open in the circuit stops current flow. In electronic equipment, most fuses are cylindrical glass or ceramic type with a metal cap at each end! The current rating also can be seen in one of the two metal end caps. There are two popular physical sizes: 1 – ¼ X ¼ - inch and 5X20mm. The 1 – ¼ X ¼ - inch size ...


Understanding Transistor Data and Replacement

If, for some reason, you can’t get an exact replacement for the transistor that you want to replace, you can refer to one of the transistor substitution guides or book, and try to identify a “near replacement”. Beware, however. A substitution guide will sometimes list a replacement for your part, even though the two parts are not very similar. The most commonly used transistor substitution guides is the Philips ECG semiconductors Master Replacement Guide. Selecting the right transistor ...


How to Read CRT Tube Part Numbers

All picture tubes, whether monochrome or color type are identified by a specific code consisting of numbers and letters. The codes are different from each other because different tubes have different characteristics.


What Is A Crystal? And How To Test It

Crystal are use to keep the frequency of the clock from drifting. If the signal from this clock stops, or is weak, or the pulses begin to vary, the electronic equipments might show intermittent faults or might stop altogether. The microprocessor pins that hold the crystal are usually called OSC IN and OSC OUT as shown in Figure 1 and the frequency is marked on the crystal. Typical examples of crystal oscillator frequency are 3.58MHZ, 4MHZ, 8MHZ, 24MHZ etc.


How to Solve Multiple Paper Loading Problem in HP5L and HP6L Laser Printer

Have you ever encountered before the problem of having multiple paper loading in your HP LaserJet 5L and 6L? Do you know that this is caused by a defective separation pad where it's rubber has worn out.


What is EEPROM ?

EEPROM stands for Electrical Erasable Programmable Read Only Memory and also referred to as E²PROM. As the name suggest, an EEPROM can be both erased and programmed with electrical pulses. Since it can be both electrically written into and electrically erased, the EEPROM can be rapidly programmed and erased in circuit for reprogramming without removing them from the circuit board.


What You Should Know Before You Buy Computer Equipment

You will have many factors to consider when deciding on which computer equipment to buy. The bewildering amount of choices can seem overwhelming. This guide will help you compare computer equipment features, and help you to examine and sift through many of the basic items before you buy a new computer. If it be a desktop PC, laptop, discount/surplus computer, a refurbished computer or a computer accessory, this quick guide will help you to get the most for your money.


Ink Cartridges & Printing Poor Print Quality Solutions

Why are there faint areas or gaps in my print out? * Unlikely, but your paper may need changing due to its deterioration due to its age. * Check that the type of paper you are using in your printer matches ('Media Type') the setting in the printer software 'Main Menu' or 'Print' dialog box. * You may need to clean the print head nozzles. These can be cleaned by employing the 'Head Cleaning' utility from within the printer software ...


Digital Camera Prints Getting the Most for Your Money

Digital cameras have really taken off in popularity in recent years. It's not uncommon anymore to see several people at an event with a digital camera. Here are some things to keep in mind when getting your digital camera prints converted into keepsakes.


How to Read Zener Diode Code

Many technicians are confused on how to really read a zener diode code. There are many types of code number indicated on it's body. The look and shape of a zener diode sometimescan be mistaken to be a normal signal diode. To differentiate it, is by looking at the codenumber on it's body- whether it is a normal diode or zener diode. Thanks to the manufacturers where their main boards are printed with the word 'ZD' which referred to zener diode and 'D' means a diode.


Looking for Information on CD Duplication and Replication?

Time is one of the most important things we have that we are always short on. One way to maximize your time is to have the most up to date technology available. But, this can be costly. If you are in the market to purchase CD duplication or replication products, you won’t have to spend a lot of money to get quality products to help you with this. Depending on what type of CD duplication you are interested in, you will more then likely find just what you need online and do so ...


Build Your First Computer from Hardware Scratches

Wow- if you do it first time and have some asset of time in your disposition – then go ahead and purchase motherboard, your favorite processor, memory, video card (probably it is better to purchase it external for advanced quality). You will also need computer case – first computer should probably go to the cheap one – with USB 2 ports from the front side – the only question – you might want to replace noisy cheap power supply with $50 dollars one. Processor fan – nowadays you ...


Testing Flyback Transformer How to Test and When to Replace It

Nowadays, more and more monitor comes in with flyback transformers problems. Testing flyback transformers arenot difficult if you carefully follow the instruction. In many cases, the flyback transformer can become short circuit after using not more than 2 years. This is partly due to bad design and low quality materials used during manufactures flyback transformer. The question is what kind of problems can be found in a flyback transformer and how to test and when to replace it. Here is an ...


Your Hard Drive is Going to Explode – Why a UPS is Essential

It’s most peoples worst computing nightmare. You wake up in the morning, flip on the computer, and it doesn’t boot. Sometimes the problem rears its ugly head as a horrific clacking noise. Other times it simply gives a read error.


Batteries for Your Laptop

With technology advancing more every day, electronics have become smaller and more mobile. This includes computers. The laptop, or notebook computer is extremely popular these days and many people have them as backup or secondary computers or even as their main computers. The great thing about a laptop is that it uses a battery to power the unti when you are away from a power source so you can literally take your computer anywhere. But in addition to the batteries, there are other parts of ...


Power Protection in the Home Theater Use of Surge Suppressors to Guard Expensive Electronic Gear

Surge Suppressors – A First Line of Defense All home theater equipment should be equipped with at least some form of surge protection. Surge suppressors represent the most basic form of power protection – a first line of defense for all sensitive electronic gear. Keep in mind that a surge in the ac voltage or a lightning strike, could lead to disaster - turning expensive gear into a smoking heap of plastic and metal. Investing in a suitably rated surge protector is ...


Survey of Both Past and Modern Printers

Printers are on-line devices initially categorised as being either impact whereby a printing head assembly of some type is in physical contact with the paper, and non-impact where there is no mechanical contact with the paper.


Review of the Apple iPod Shuffle

Introducing the mini iPod Mini: the iPod Shuffle The iPod shuffle is basically a smaller version of Apple's extremely popular iPod and iPod Mini. The shuffle is much smaller than the iPod (about the same size and weight as a pack of gum), but holds fewer songs as a result. You can now purchase either a 512MB iPod shuffle, or one with a full 1GB. Keep in mind that the regular iPod can now hold up to 40GB, so it has quite a bit more storage. The shuffle though is designed ...


Hurricanes: Disaster Prevention Recovery Mario Ramis

Before the next time you hear hurricane --think inland flooding! Conduct another walk-through of your organization's business continuity plan. Look for business and computing changes since the plan was originally implemented, last tested, or revised. Determine what changes in the plan may be required-- and then make them. Check your hurricane and flood emergency action plan and update it as necessary. If there are changes, make new copies and distribute it to all staff ...


You Can, But Do You Need To?

You know him; you may even be him. Deftly wrist-driving an SUV in rush hour, cell phone cradled between ear and shoulder while simultaneously pecking his PDA as the GPS system maps out the quickest route to the next stop. Reveling in the orgy of technology that allowed him to focus on everything but staying between the white lines, I doubt he noticed me being forced onto the shoulder of the road. Gadgets are cool, but at 70 miles an hour, they lose some appeal.


The Third Reality The End of the Personal Computer Desktop

In this 21st century of terabytes and gigabytes, in this high-definition age where new ideas "seems" to be redefined hourly, in this Microsoft galaxy, Macintosh stratosphere, planet Linux, where the only question left for desktop "consumers" is "which computer desktop define me as a person?". Ironic? Actually irony "redefines" the definition of "tyranny", applied in this now saturated desktop market since the last few years.


Why Information System Security Professionals Should Join the ISSA

I’ve finally stopped procrastinating and joined my local Information System Security Association, Colorado Springs Chapter (ISSA-COS). A few of my co-workers have been encouraging me to join since last year.


Recognize and be Able to Differentiate and Explain the Following Access Control Models

· MAC (Mandatory Access Control) · DAC (Discretionary Access Control) · RBAC (Role Based Access Control)


TV Viewing Distance and Screen Placement in the Home Theater

The optimum TV screen size is directly related to the available viewing distance – but there are other factors as well that need to be taken into consideration.


Understanding the Different Dish Network DVR Models

A Dish Network DVR is a device that records television programs onto a hard disk drive in digital format for later viewing. DVRs give the freedom for you to record, pause, rewind, and fast forward television shows as you please. However, there are many different models available with different features and capabilities. What exactly are the differences between all the different models of Dish Network DVRs? Here is a quick and basic overview of some of the different Dish Network DVR models ...


RFID: NAVI (Navigation Aid for the Visually Impaired)

Thanks to an engineering professor and a group of students at the University of Rochester, Rochester, New York, RFID may play a significant role in increasing independence for people who are visually impaired or blind.


RFID: Blink!

JP Morgan Chase & Co. will begin issuing contactless "blink" cards to millions of MasterCard and Visa credit cardholders next month.


Cisco CCNA Certification: The Hidden Details Of Telnet

Telnet is a simple yet powerful program that allows you to connect to a remote Cisco router or switch, and then configure it as though you were right at the console. Telnet is also one of those features that seems so very simple, until you get asked a half dozen questions about it on your CCNA exams. As with all topics, it’s the details you know about Telnet that will help you pass the Intro and ICND exams.


Cisco CCNA Certification: Passwords, Passwords, Passwords!

When you’re looking at a Cisco router configuration, figuring out what the different passwords do can be a little confusing at first. But as I tell all my students, the key to understanding something that looks complex is to break it down to smaller parts.


Local vs. Network Diagnostics

Obviously anyone who maintains PCs, whether local or on a network, is bound to be familiar with the demands of getting the offending machine back up and running as quickly as possible!



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