Question about HP OfficeJet Pro k550 Printer

2 Answers

Streaks / Bands of broken print area

My printer is printing all the colors fine except black. Everything printed in black has streaks of white unprinted areas through it. I printed a full page of absolute solid black. It prints a full page of black with many, many white lines through it. It seems to get a little bit better over time, by printing alot of black, but that could cost more in paper / ink than a new printer. I have tried: * Replacing the print cartrige. * Replacing the print head. * Carefully cleaning the areas that interface between the print cartrige / print head and the printer. * Running all of the software service functions numerious times. * Tried all troubleshooting tips / recommendations by HP support. Anyone have any ideas? This seems crazy, what could it be? A hardware problem with the printer itself?

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  • Anonymous Feb 29, 2008

    The pages came out with white stripes where black was supposed to be. I tried cleaning the print head with kitchen paper an isopropyl, cleaned the contacts of the print head and... surprise! black ink would never come out again! The ink reservoir is half full, so there is plenty of black ink everywhere except on the paper.

  • dmsilverthre Feb 10, 2009

    We have the same problem - almost. I am a screen printer and at 1st this printer did fine, but after about a month, it started printing in a light black tone and would not print with enough black ink. I have tried everything. My son has this printer and he has no problems, so I know it is suppose to print in black quality.

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No cleaning was successful, finally replaced the printhead and solved the problem.

Posted on Mar 06, 2008

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First with a clean soft cloth and a very small amt of alcohol clean off the underside of the printer carridge (the holder for the print heads) also where the print heads cleaning station is clean out any large masses of congealed link. Then remove the ink cartridge in question and with a pencil eraser gently rub the contacts and both the cartridge and the carridge replace the cartridge. Using the software tools for the printer clean and align the printheads ( if there is an option to do so). If this dosn't fix the problem try a different ink cartridge.

Posted on Nov 07, 2007

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Step one: Retry the print job The problem may occur only rarely. If you have not seen it in other printouts, try again. Step two: Increase the print quality mode If reprinting did not help, try increasing the print quality mode.
  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected, and then click Properties .
  3. Select the Paper/Quality tab.
  4. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only) If the streaks are in a black area of a black and white printout, change to grayscale printing. NOTE: This step does not apply to color printouts.
  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected and click Properties .
  3. Click the Color tab, and select Print Grayscale and High Quality .
Step four: Clean the printheads If the print quality is still bad, clean the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open HP Solution Center .
  3. Click Settings , Print Settings , and then select Printer Toolbox .
  4. Click the Service Tab .
  5. Click Clean Printhead , and then click Clean .
Step five: Align the printheads If the print quality is still bad, align the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox , and select the Printer Services tab.
  3. Click Align Printheads . The Align Printheads window opens. Click Align .
  4. The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed If the print quality is still bad, calibrate the linefeed:
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox and select the Printer Services tab.
  3. Click Calibrate Advanced Linefeed . The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
  1. Make sure the printer is loaded with unused white paper.
  2. Press the Setup button.
  3. Press 1 and * simultaneously.
  4. Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
    • If the Black block has lines – replace the KY printhead.
    • If the Cyan block has lines – replace the MC printhead.
    • If the Magenta block has lines – replace the MC printhead.
    • If the Red block has lines – replace the KY printhead.
    • If the Green block has lines – replace the KY printhead.

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Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Step two: Increase the print quality mode
If reprinting did not help, try increasing the print quality mode.
In the application you are printing from, click File, and then click Print. Make sure the printer is selected, and then click Properties.
Select the Paper/Quality tab. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only)
If the streaks are in a black area of a black and white printout, change to grayscale printing.
NOTE:- This step does not apply to color printouts.
In the application you are printing from, click File, and then click Print.
Make sure the printer is selected and click Properties.
Click the Color tab, and select Print Grayscale and High Quality.
Step four: Clean the printheads
If the print quality is still bad, clean the printheads.
Make sure the printer is loaded with unused white paper.
Open HP Solution Center.
Click Settings, Print Settings, and then select Printer Toolbox.
Click the Service Tab.
Click Clean Printhead, and then click Clean.
Step five: Align the printheads
If the print quality is still bad, align the printheads.
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox, and select the Printer Services tab.
Click Align Printheads. The Align Printheads window opens. Click Align.
The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed
If the print quality is still bad, calibrate the linefeed:
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox and select the Printer Services tab.
Click Calibrate Advanced Linefeed. The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads
If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
Make sure the printer is loaded with unused white paper.
Press the Setup button.
Press 1 and * simultaneously.
Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
If the Black block has lines – replace the KY printhead.
If the Cyan block has lines – replace the MC Printhead.
If the Magenta block has lines – replace the MC Printhead.
If the Red block has lines – replace the KY printhead.
If the Green block has lines – replace the KY printhead.

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That would require a very special "white ink" print cartridge for your printer. The regular color ink cartridges won't do this, since they can only make the black paper "black-er" when it prints ink on the paper. You may want to ask the manufacturer (Canon) if they make a special "white ink" cartridge for that printer, or know of someone who does. Your only other option is to make a "negative" print image in Photoshop, or a similar graphics software application, and then PRINT the black ink on white paper... which will then leave everything you want to "print white" as an unprinted area on the white surface of regular paper. (Note: with such heavy printing you would want probably want to use a heavier grade of paper, such as 28# or 60#.) This will use a LOT of ink, but it may be the only way you can accomplish your goal. Hope this helps...

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