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I have an HP LaserJet M175nw laser printer which goes into sleep-mode after 10 minutes of non-use. I know sleep-mode uses a very small amount of power, but the flashing light on the control panel is driving me nuts. I know I can turn-off the printer via the on/off button, but when it is turned on manually, there is some whirring sound which I guess might be the machine warming-up.

Is any toner used during this warm-up (or cleaning) cycle? Am I better-off keeping the printer in sleep mode, or is it OK to turn off manually?

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Toner is only used when you print. –  Moab Apr 8 '12 at 0:25
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3 Answers 3

up vote 9 down vote accepted

The printer will not use any toner while in power save mode or during warm up. You can safely use either power save mode or just turn it off. If you aren't going to use it for long periods of time, OR the flashing light bothers you, I'd suggest turning it off.

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Inkjet printers charge/clean their print heads during start-up, cartridge/head changes and in intermediate head cleans during long print jobs and actually pump ink out the nozzles into the waste discharge tray (opening up defunct inkjets and examining this discharge tray will show that at least 1/3 of the ink run through the printer during its lifetime ends up in this discharge tray).

Fortunately, Laser printers work a little bit differently in one important way.

Monochrome Laser printers go through a start-up routine to check for jams and make sure the paper path is clear. While the parts rotate, toner is circulated through the mechanism that transfers it to the drum, but because the drum has no charge on it, no toner gets transferred to the drum and gets returned back into the cartridge to await an actual print job where it actually gets used.

EDIT: Color Laser Printers have a slightly different problem. They have to keep four colors in registration (synchronize where the colors land on the paper fed through the printer) and therefore do a calibration routine which will use toner in this process.

If you have an art department, and they still have the stuff, a piece of rubylith tape does a good job of dimming out those over-active LEDs.

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a credible source for this would be nice –  Baarn Apr 8 '12 at 0:54
    
@Informaficker I find it funny that this comment is attached here, and not to the accepted answer. –  Joshua Drake Nov 14 '12 at 14:35
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A cartridge vendor alleges

Reduce Stop/Start cycles

If you are using a laser printer you may notice that the printer does some whirling before and after every printed document. If you are printing a single page the printer goes through a start-up cycle, prints the page, and then goes through the slow-down cycle. The additional time and turning incurred during the start-up and slow-down cycles can greatly wear out the components inside your toner cartridge causing to lighter printing and increases the likelihood of developing defects. While no printing is occurring, the components in your printer and cartridge spin just as if something was being printed. In addition, toner continues to accumulate on the drum even though there is no printing. This extra toner is swept into the waste-bin of the cartridge, reducing the supply of toner available for printing.

My emphasis.

A test of software that claims to reduce toner usage incidentally mentioned

The cartridge was weighed after printing 500 pages so that any cartridge start-up toner usage did not skew the results

The Wikipedia article says

Some color laser printers, notably some Lexmark models[citation needed] run "calibration" cycles even when no printing has occurred for weeks. These are widely reported[by whom?] to waste a significant amount of toner from each reservoir, in addition to consuming electricity. This has a significant impact on printing economy, especially in low-volume applications. On some models these calibration cycles can be disabled via a menu choice, for others the printer must be unplugged to avoid this waste. Printers that have this issue have a replaceable "waste toner bin", which is another periodic operating expense.

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Calibration processes on a color laser printer are different than paper path jam checks on a monochrome printer. A monochrome printer does not have to check its color registration as it doesn't have to synch where four colors land on a page. –  Fiasco Labs Apr 8 '12 at 16:16
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