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Engineering
Electrical Engineering
LED/"LASER" Printers - How are +5000 LEDs addressed/controlled?
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[QUOTE="Tom.G, post: 6569623, member: 581973"] Laser printers use a single Laser diode. The horizontal scanning is done with a rotating octagonal (or maybe it hexagonal, don't remember for sure) mirror. The vertical (length-wise) scanning was just the paper movement thru the printer. One of the common failure modes in some early, major brand, printers was the IC (chip) that drove the scanner motor. I don't remember the details but the electrical design was rather borderline. I have repaired a few by replaceing the IC in the scanner assembly and adding a few resistors. The other, less common failure mode, was the bearings wearing out, requiring a motor replacement; but it was more practical to replace the whole scanner assembly. The service manual for an early (2004) Laser printer is available here: [URL]https://www.printertec.com.br/arquivos_download/1160.pdf[/URL] Lots of technical info there! Have Fun! Cheers, Tom [/QUOTE]
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LED/"LASER" Printers - How are +5000 LEDs addressed/controlled?
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