IGCSE Computer Science Tutorial- 1.3.4 (b)- Laser Printers

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my GCSE computer science syllabus statement one point three point four be described the print yeah yeah you're probably getting bored of me saying this anyway laser printers well a laser printer is a printer which makes use of powdered ink and static electricity to carry out print jobs true laser printer kind of looks like this but they tend to look a bit bigger actually yeah and they usually have larger trays than this um anyway laser printers as said use dry powdered ink instead of liquid ink to print like inkjet printers do they also use static electricity to print characters and images unlike inkjet printers which print line by line laser printers print the whole page in one go whoa pretty cool this gives them a speed advantage which is why they are suitable for large print jobs you might you may see inkjet printers if like any in your school for example or wherever you wherever you are and you'll notice if you've used them that the pretty the pretty damn fast so yeah they also don't run out of ink half way like inkjet printers do so you may notice that you printed with inkjet printers the ink may tend to run out halfway and it's kind of annoying but laser printers it's a lot less likely anyway here's the algorithm so the data from the files to be printed a central printer driver yes printer driver checks the data is in an understandable format I'm rushing through these because we looked at this like these steps in inkjet printers but it's a bit different once we get to a certain step it's a virtual drive it checks if the printer is able to carry out the print job so like checks printer it's busy no paper or whatever their data sent to the printer and stored in the printer buffer but here we go a printing drum in the printer is given a positive charge now you might be wondering what the hell's of printing drums well a printing drum you're gonna find out what I mean you're gonna see what it looks like but just know that a printing drum it's kind of like something that rolls you'll see you'll see in a minute so it's given a positive charge and a laser beam removes positive charge in certain areas on the drum this of course leaves negatively charged areas which match the characters or images to be printed which is pretty cool the drum is then covered with positively charged toner powdered ink which sticks to the negatively charged areas of the drum so that's how it how it happens a negatively charged piece of paper is then rolled over the drum causing the toner to stick to the paper the negative charge is removed from the paper to prevent it from sticking to the drum and finally the paper goes through a fuse er which melts the ink onto the paper and a discharge lamp removes all the charge from the drum to prepare it for the next job so that's pretty much how it happens if this is unclear we're about to see a picture so maybe you'll get a better idea that's that's a bit just sort of threw stuff there but if you get it good if you don't well take a look at this so here's the paper tray the paper gets rolled here's the drums if you're wondering what it looked like it's kind of like a big rolling pin kind of thing I guess so here's the toner hopper like the place where the powdered ink is stored so then there's the laser the papers then sort of yeah you see push through and then the fuser which melts the ink and then finally it exits and the discharge lamp is somewhere over here so yeah that's pretty much how it looks if you were wondering it kind of kind of looks like that so you can hopefully get a better idea of how the printer works so here's the use of laser printers now in the last video I said they're good for carrying out large printing jobs which is true because that's mentioned laser printers have a speed advantage over inkjet printers so laser printers are good for large high quality print jobs so in other words high-volume printing so an example is printing many flyers or posters to put around the town or printing a lot of exam papers for students who are taking their eye GCSEs so yeah that's an example of when it would be good to use a laser printer over an inkjet printer because in inkjet printer would honestly take hours to print like a lot of posters and another reason for this is they have large toner cartridges and large print trays which also gives it an advantage because you don't have to keep putting paper in the tray you don't have to keep changing the cartridge so that's about it

IGCSE Computer Science Tutorial- 1.3.4 (b)- Laser Printers

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