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bottom of the toner cartridge and will usually have two rollers to fuse the toner Sometimes the fuser is somewhat enclosed and difficult to recognize, because the rollers are hidden from view To help you determine the location of the fuser, think about the data path of the paper and the fact that fusing is the final step of printing The toner is merely resting on top of the paper after the static charge eliminator has removed the paper s static charge The toner must be permanently attached to the paper to make the image permanent Two rollers, a pressure roller and a heated roller, are used to fuse the toner to the paper The pressure roller presses against the bottom of the page while the heated roller presses down on the top of the page, melting the toner into the paper The heated roller has a nonstick coating such as Teflon to prevent the toner from sticking to the heated roller Power Supplies All laser printers have at least two separate power supplies The first power supply is called the primary power supply or sometimes just the power supply This power supply, Cross Check which may actually be more than one power supply, provides High Voltage Keep Away! power to the motors that move the The power supply inside a laser printer is not the only dangerpaper, the system electronics, the ous high-voltage toy in the world of PC equipment You ve learned laser, and the transfer corona The about two other potentially hazardous electrical components that you high-voltage power supply should approach with caution usually provides power only to the 1 What are they primary corona The extremely high voltage of the high-voltage 2 Which of these three items is potentially the most deadly power supply makes it one of the To refresh your memory, check out 7, Installing and Troumost dangerous devices in the bleshooting Power Supplies, and 12, Installing and Troubleworld of PCs! Before opening a shooting Video printer to insert a new toner cartridge, it is imperative that you always turn off a laser printer! Turning Gears A laser printer has many mechanical functions First, the paper must be picked up, printed upon, and kicked out of the printer Next, the photosensitive roller must be turned and the laser, or a mirror, must be moved from left to right Finally, the toner must be evenly distributed, and the fuser assembly must squish the toner into the paper All these functions are served by complex gear systems In most laser printers, these gear systems are packed together in discrete units generically called gear packs or gearboxes Most laser printers will have two or three gearboxes that a tech can remove relatively easily in the rare case when one of them fails Most gearboxes also have their own motor or solenoid to move the gears System Board Every laser printer contains at least one electronic board On this board is the main processor, the printer s ROM, and RAM used to store the image before it is printed Many printers divide these functions among two or three boards dispersed around the printer An older printer may also have an extra ROM chip and/or a special slot where you can install an extra ROM chip, usually for special functions such as PostScript.

3 Right-click the device you want to manage, and then select one of the following options: Enable Uninstall Disable

Victory!

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

The Task Manager, shown in Figure 14-29, holds a wealth of information You can get real-time data on your resources and processes, as well as information on logged on users and applications Some of the uses of the Task Manager include the following: Performance monitoring View real-time performance metrics from key components, including processor, memory, network throughput, hard disk drive I/O, and more Performance tuning You can align processes with processors using the Processor Affinity property of running processes, and terminate any process that may be using too much of any given resource

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Summary

You will need a deployment tool to get your image out and installed to your workstations Microsoft does provide its own Vista-specific deployment tool; however, there are also third-party options you can consider The deployment tool is a software package that facilitates packaging, distribution, installation, and reporting Selecting the right software can be tough A blend of variables

On some printer models you can upgrade the contents of these ROM chips (the firmware) by performing a process called flashing the ROM Flashing is a lot like upgrading the system BIOS, which you learned about in 4, Working with BIOS and CMOS Upgrading the firmware can help fix bugs, add new features, or update the fonts in the printer Of particular importance is the printer s RAM When the printer doesn t have enough RAM to store the image before it prints, you get a memory overflow problem Also, some printers will store other information in the RAM, including fonts or special commands Adding RAM is usually a simple job just snapping in a SIMM or DIMM stick or two but getting the right RAM is important Call or check the printer manufacturer s Web site to see what type of RAM you need Although most printer companies will happily sell you their expensive RAM, most printers can use generic DRAM like the kind you use in a PC Ozone Filter The coronas inside laser printers generate ozone (O3) Although not harmful to humans in small amounts, even tiny concentrations of ozone will cause damage to printer components To counter this problem, most laser printers have a special ozone filter that needs to be vacuumed or replaced periodically Sensors and Switches Every laser printer has a large number of sensors and switches spread throughout the machine The sensors are used to detect a broad range of conditions such as paper jams, empty paper trays, or low toner levels Many of these sensors are really tiny switches that detect open doors and so on Most of the time these sensors/switches work reliably Yet occasionally, they can become dirty or broken, sending a false signal to the printer Simple inspection is usually sufficient to determine if a problem is real or just the result of a faulty sensor/switch.