Question about HP DeskJet 840c InkJet Printer
I cannot find the instructions on how to run the nozzle cleaning etx. for the 840C. The prints have poor quality, with lines showing.
I'm not sure what you mean by lines, but I had poor print quality and even a "ker-chunk" noise in the middle of the print head travel. On these HP printers, there is a strip of plastic with very small stripes printed on it that runs through the back of the print head. This is a linear encoder that lets the printer know the position of the print head. This gets dirty and the optical "eye" can't see the transitions of the lines on the strip. Clean it with some iso-alcohol and water and you should be all set to go.
Posted on May 22, 2008
The nozzle cleaning utility is in the printer device properties.
Posted on Oct 07, 2007
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Posted on Jan 02, 2017
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If you find that the printout is unexpectedly faint or some dots are missing, you may be able to solve these problems by cleaning the print head, which ensures that the nozzles are delivering ink properly.
You can clean the print head from your computer using the Head Cleaning utility in the printer software or from this product itself by using the control panel buttons.
Refer to the appropriate section below to use the Head Cleaning utility.
Follow the steps below to clean the print head using the Head Cleaning utility.
Make sure that A4 or Letter size paper is loaded in the sheet feeder.
Make sure that this product is on and the ! Error light is off.
Access the printer software.Accessing the Printer Software for Windows
Click the Maintenance tab, then click the Head Cleaning button.
Follow the on-screen instructions.
Head cleaning... appears on the LCD panel while this product performs the cleaning cycle.
Caution:Never turn off this product while Head cleaning... appears on the LCD panel. Doing so may damage this product.
When Head cleaning... disappears from the LCD panel, click Print Nozzle Check Pattern in the Head Cleaning dialog box to confirm that the print head is clean.
If the nozzle check page does not print satisfactorily, you may need to repeat the head cleaning and print the nozzle check pattern again. See Cleaning the Print Head.
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