A+ Certificate – Printing Process

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Client Process 1 –
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User sends a print job from within an application
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Client Process 2
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The application calls a GDI (Graphics device Interface)
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Client Process 3
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The spooler receives the print job from the GDI
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Spooler Process 1
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Winspool.drv issues an RPC (remote procedure call) to Spoolsv.exe
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Spooler Process 2
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Spoolsv.exe calls Spollss.dll, the print router
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Spooler Process 3
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Localspl.dll routes the print job to either the local printer provider or the remote print server.
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Spooler Process 4
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The local print provider finds a print processor capable of handling the job’s data type and then sends the job to the print processor.
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Spooler Process 5
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The print processor makes any necessary modifications for printing the job.
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Spooler Process 6
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The page-separator processor receives the print job from the print processor and, if necessary, adds a separator page.
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Spooler Process 7
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The job is sent either directly to the appropriate port monitor or to a language monitor and then on to the port monitor. The port monitor is responsible for communications between the PC and the printer. A language monitor is responsible for translating the print job into code that the printer understands.
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Printer Process 1
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Print spooler sends job to the printer
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Printer Process 2
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Print language is translated into information that the printer can print.
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Laser Printer Process 1
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Cleaning and Erasing – A rubber blade clears excess toner from the drum, another roller or corona wire removes the charges from the drum
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Laser Printer Process 2
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Charging or conditioning – The primary charge roller (newer printers) or primary corona wire (older) applies a negative charge of about -600 volts to the EP drum.
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Laser Printer Process 3
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Writing or exposing – The laser beam reduces the negative charge to about -100 volts on the EP drum in the areas that become the image to be printed.
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Laser Printer Process 4
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Developing – Areas of the drum that were written to by the laser attract toner
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Laser Printer Process 5
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Transferring – A positive charge of about +600 volts is applied to the paper by the transfer charging roller or corona wire.
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Laser Printer Process 6
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Fusing – Pressure and heat set the toner to the paper. A 350 F degree fusing roller melts the toner and squeezing the paper through a set of rollers, presses the toner into the paper.

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