Question about HP DeskJet 840c InkJet Printer

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How to clean noxxles, heads, etc.

I cannot find the instructions on how to run the nozzle cleaning etx. for the 840C. The prints have poor quality, with lines showing.

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  • GinnyLou Jul 11, 2008

    Only the top half of the words are printing since I installed a new cartridge.

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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

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The nozzle cleaning utility is in the printer device properties.

Posted on Oct 07, 2007

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Cleaning head and nozzles


Cleaning the Print Head


r_bullet.gifUsing the Head Cleaning utility
r_bullet.gifUsing the control panel buttons

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.


r_note.gifNote:r_space.gif

  • Print head cleaning uses both color and black inks. To avoid wasting ink, clean the print head only if the copy quality drops (for example, blurred printout, incorrect or missing color.)
r_space.gif
  • Use the nozzle check first to confirm that the print head needs to be cleaned. This saves ink.
r_space.gif
  • When the Error light is on and a message appears on the LCD panel to prompt you to replace the ink cartridge or to indicate the ink is low, you cannot clean the print head. In this case, replace the appropriate ink cartridge first.


Using the Head Cleaning utility

Refer to the appropriate section below to use the Head Cleaning utility.


For Windows

Follow the steps below to clean the print head using the Head Cleaning utility.


r_1.gifMake sure that A4 or Letter size paper is loaded in the sheet feeder.


r_2.gifMake sure that this product is on and the ! Error light is off.


r_3.gifAccess the printer software.r_arrow2.gifAccessing the Printer Software for Windows


r_4.gifClick the Maintenance tab, then click the Head Cleaning button.


r_5.gifFollow the on-screen instructions.


Head cleaning... appears on the LCD panel while this product performs the cleaning cycle.


r_space.gifr_caut.gifCaution:r_space.gifr_space.gifNever turn off this product while Head cleaning... appears on the LCD panel. Doing so may damage this product.


r_6.gifWhen 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.


Good: print head does not need to be cleaned yet.


d00_good.gif



Not Good: print head needs to be cleaned.


d00_miss.gif


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.


r_note.gifNote:r_space.gif

  • If the copy quality has not improved after repeating this procedure four or five times, turn this product off and leave it alone overnight. Then, perform the nozzle check again and repeat the head cleaning if necessary.
r_space.gif
  • If the copy quality still has not improved, one or both of your ink cartridges may be old or damaged and may need to be replaced. To replace an ink cartridge before it is empty, see Replacing an Ink Cartridge. If the copy quality remains a problem after replacing the ink cartridges, contact your dealer.
r_space.gif
  • To maintain good copy quality, we recommend copying a few pages at least once every month.

Apr 14, 2013 | Epson Stylus CX6400 All-In-One InkJet...

1 Answer

Poor print quality


You may have blocked print head nozzles.
Try the printer maintenance to clear the printer nozzles.
After several deep cleaning attempts and there is no improvements in the print then a new print head is required.

Oct 10, 2012 | OKI C9500dxn Led Printer

1 Answer

Print quality is very poor. Nozzle check sggests


You'll need a new printhead, QY6-0054-000 around $50.00. www.precisionroller.com has some in stock.

Jan 13, 2010 | Canon PIXMA MP130 All-In-One InkJet...

1 Answer

When copying in black only the quality is very poor in spots - in color it prints fine. I've already done every maintenance on the nozzles that is available. The poor quality is part of various lines are...


The print head is clogged.You can try unclogging manually.WARNING: next steps may lead to a defective of print head, try on your responsibility.
Open the cover and first remove the ink cartridges.Then open the holder and remove the print head.Run hot tap water and put the print head with the nozzles up to stream water.Hold that 5 mins then turn the print head around with the nozzles down.Hold that for every color of 5 mins.Then put the print head in hot water with the nozzles down.Left it water about 15 mins and then you must very nice to dry.When the print head dry put it in printer and start cleaning.If this not help you need to replace the print head.It's part number is QY6-0049.

Nov 08, 2009 | Canon PIXMA MP780 All-In-One InkJet...

1 Answer

Photos printed come out faint and lines andblack streaks across the photos how do i solve this/


lean The Print Head Nozzles (Windows) The following contains instructions to check the nozzles for poor print quality and perform cleanings of the print head nozzles as necessary. If print results are faint or streaks are printed, the print head nozzles may be clogged. Print quality can be improved by performing print head cleanings or print head deep cleanings. aution: Only used the approved methods below to clean the print head. Use of other methods may further clog the nozzles on the print head and may cause permanent damage the print head.
Note: It is important to check the cleaning results by printing Nozzle Check Pattern after each cleaning. Cleaning and Deep Cleaning consumes a certain amount of ink. Only perform a cleanings when necessary.
Print a Nozzle Check Pattern
  1. Confirm that the printer is connected to the computer and the printer is turned on.


  2. Complete or cancel any print jobs in progress.


  3. Open the Printers folder.

  4. Click the Maintenance tab. (The Maintenance window opens.)

    mp_500_maint_tab.jpg


    Note: The layout varies depending on the printer and version of Windows you are using.


  5. Insert a piece of letter-sized plain paper in the paper tray.

  6. Verify the desired paper source for the Nozzle Check is selected on the unit by changing the Paper Feed Switch if necessary.


  7. Select 'Nozzle Check'.


    spacer.gif

Aug 27, 2009 | Canon PIXMA MP600 all-In-One InkJet...

1 Answer

My printer Hp 840c is not printing colour prints?


Friend try the utilities through cleaning nozzle check and head cleaning

Jul 16, 2009 | Apple HP DeskJet 840c InkJet Printer

1 Answer

Can you help? After changing the cartridges, I keep getting a message about the ink head being incorrect...I am directed to press 'OK' which does not help; then to turn printer off and on again, which...


Cleaning your head might resolve your problem. Perform the below steps to clean the head:

Print Head Cleaning / Head Refreshing If the printed nozzle check pattern is broken, missing, or a specific color is not printed, clean the print head (Cleaning) or print head deep cleaning (Deep Cleaning). Note:
  1. Cleaning the print head consumes a small amount of ink. Cleaning too often reduces the amount of ink in the ink tanks.

  2. Print head cleaning is performed when you connect the power cord. Your machine may perform print head cleaning periodically to avoid clogging.
Overview:
Step1:
Print the Nozzle Check Pattern.
To check whether the print head nozzles are clogged, print the Nozzle Check Pattern.
downicon.gif If the print quality is poor, perform print head cleaning.
Step 2:
Perform print head cleaning.
This unclogs the print head nozzles
Print the Nozzle Check Pattern again.
To check whether the print head nozzles are clogged, print the Nozzle Check Pattern.
If the print quality is still poor, perform two print head cleanings.
downicon.gif Print the Nozzle Check Pattern again.
Step 3:
Perform deep print head cleaning.
This is a more powerful cleaning.

Displaying the Maintenance screen
  1. Ensure that the printer is powered on.

  2. Press the <Menu> button.

  3. Press the left or right cursor to select [Maintenance/settings], then press <OK>.

  4. Press the left or right cursor to select [Maintenance], then press <OK>.

Print Nozzle Check Pattern
  1. Press the Open button to open the output tray.

    mp500_openbutton.gif

  2. Load letter-sized plain paper in the auto sheet feeder (ASF) or the cassette.

  3. Display the Maintenance screen on the printer.

  4. Press the up or down cursor to select [Nozzle check], then press the <OK>.

    mp800_nozzlecheck.gif

  5. Press the up or down cursor to select [Yes], then press <OK>. (The nozzle check pattern is printed.)

  6. Confirm the nozzle check pattern.
05sj00160_03a.gif 05sj00160_03b.gif < 1 > The normal nozzle check pattern
< 2 > The abnormal nozzle check pattern
< 3 > Some black ink lines are broken.
< 4 > White lines are present in the color ink pattern.
< 5 > Both black and color inks are not present.

Note:
  1. When all patterns are printed normally, press the up / down cursor button to select "All A" and press the OK button.

  2. When any patterns are printed abnormally, press the up / down cursor button to select "Also B" and press the OK button.
Print Head Cleaning:
  1. Display the Maintenance screen on the printer.

  2. Press the up or down cursor to select [Cleaning], then press <OK>.

    mp800_cleaning.gif

  3. Press the up or down cursor to select [Yes], then press <OK> to start print head cleaning.

    Note:
    Do not do any other operations until print head cleaning is completed.


  4. Print the nozzle check pattern and check the print head status.
Deep (Print Head) cleaning:
  1. Display the Maintenance screen.

  2. Press the up or down cursor to select [Deep cleaning], then press <OK>.

    mp800_deepcleaning.gif

  3. Press the up or down cursor to select [Yes], then press <OK> to start print head deep cleaning.

    Note:
    Do not do any other operations until print head deep cleaning is completed.


  4. Print the nozzle check pattern and check the print head status.

    Note:
    If the printed result does not improve even after doing print head deep cleaning, turn off the printer. Then, after 24 hours or later, do print head deep cleaning again. (After a given time interval, ink could dissolve itself, resulting in ink unclogging.)

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!

Apr 22, 2009 | Canon Pixma MP500 All-In-One InkJet...

2 Answers

Horizontal banding on prints


try aligning the print heads before cleaning them

Oct 10, 2008 | Epson Stylus CX5400 All-In-One InkJet...

1 Answer

Print quality is poor


if you replace the black ink cart with an original one then it's the print head
Solution: Cleaning the Print Head - C555 / C560 / C635 / C530 / C545

Untitled Document Follow this procedure to clean the BJ cartridge print head:
1. Press c755funckey.gif 2. Press c755cleankey.gif 3. Use c755down.gif or c755up.gif to select the [HEAD CLEANING]..
4. Press c755set.gif.
The MultiPASS cleans the print head.

Feb 12, 2008 | Cannon MULTIPASS C530 Printer

3 Answers

Vertical lines throughout photos


Solution: Clean The Print Head Nozzles (Windows) MP500 / MP800
lean The Print Head Nozzles (Windows) The following contains instructions to check the nozzles for poor print quality and perform cleanings of the print head nozzles as necessary. If print results are faint or streaks are printed, the print head nozzles may be clogged. Those phenomena can be improved by performing print head cleanings or print head deep cleanings. nozzlecheckflow_en.jpg

Dec 19, 2007 | Canon Pixma MP500 All-In-One InkJet...

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