Question about Canon PIXMA MP780 All-In-One InkJet Printer

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Every other line printing poorly

Every other line has a line through it and the ink is light on those lines

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  • Expert
  • 153 Answers

Your machine is getting on in age a bit now sounds as it needs a new print head, if you remove the printhead and physically give it a good clean and replace back in machine and do a head clean and your prints are still bad you need a new printhead
Canon Tech

Posted on Apr 13, 2009

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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jackboy
  • 2985 Answers

SOURCE: Printing is poor quality with

What printer- what Computer all information is required

Posted on Jun 17, 2008

SOURCE: Black ink not printing clearly on all lines

The first suggested solution by the "wiz" is rediculous. If you had an owners manual it would tell you to do this.
What you really have to do is take the printer head off and GENTLY scrape the gunk off of it. Paper fibers build up on it.
-Open lid
-lift up on gray tab thing that is where you put the tink tanks in.
-pull out the black cartridge that holds all the ink tanks in place and look at the bottom.
-there is 5 small silver slits that color ink comes out and a long one for black ink.
-there maybe gunk all over the bottom - clean it off and you can use a folded piece of paper or gently with a pen cap.
-That gunk is filled with ink so be careful and do it over some paper towel.
-Place the blackcartridge (the printerhead) back in and use gary tab thing to close it.
-recheck to make sure the ink tanks are locked in
close the lid.
-then clean nozzle accesed through the printer "properties"
-Wont fix but makes it better. You need to get a new print head ($50) or try Canon Printhead Repair Kit ($10) or most effective, get a new printer ($50 without all of that stuff you still dont use)

Posted on Jul 18, 2008

rhoncruz
  • 134 Answers

SOURCE: #5 black ink cartridge skips through the middle occasionally

Replacing the print head
The print head may need replacing if, after all print head and ink tank troubleshooting has been performed:

  • The nozzle test appears broken or to have horizontal white streaks.
  • One or more of the colors is missing from the Nozzle Test.
  • The colors are incorrect on the Nozzle Test.
  • A print head error is indicated on the unit.
  • The printer powers off when the print head is installed.
I hope it helps!!!

Posted on Dec 02, 2008

leroyal
  • 2120 Answers

SOURCE: Printing quality poor

Dried up ink cartridge, I have seen many new, dried up cartridges.

Posted on Dec 21, 2008

  • 88 Answers

SOURCE: printer output has shadows, blurring, streaks, lines, poor color

Seem like blocked hole(s) on the color print head...
Most likely if there is a deep clean option then do it (may need a few times to unblock a hole or never).
Also get the printer physically cleaned up if you can see dusts inside (vrtical lines on color bars).

Posted on Mar 20, 2009

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1 Answer

HP Deskjet 5150 poor print quality


For poor printing problems I suggest you run the Tap 10 diagnostic print test (see link to video below).
If the new (or refilled/reman/compatible) HP 56, 57 or 58 ink cartridge refuses to print black/color and/or function at all (i.e. blinking ink light on Deskjet 5000 series printer) or fails to complete the printer alignment following cartridge installation, then the ink cartridge either has a connectivity issue with the flexible printed circuit cable (inside unit where cartridge mates with cable), the rear cartridge contacts or cable contacts are dirty with ink residue, or the cartridge is suffering from marginal internal electrical performance. It is suggested you perform the TAP 43 (and TAP 10) DIAGNOSTIC PRINTER TEST to evaluate the ink cartridges electrical performance. Visit Inkjet411 support site to see instructional video: http://inkjet411.com/?page_id=2358
NOTE: For the HP Deskjet 5000 series printer models, when you get an HP 56, 57 or 58 integrated ink cartridge refilled (i.e. currently offered at Costco or Frys today) or if you buy a remanufactured/compatible HP ink cartridge, the ink levels are not initially reset. However, continuing to use an ink cartridge which displays LOW INK alerts is permitted by the printer, simply select OK, CONTINUE or DISMISS when these alerts are observed. Now, it is possible to reset the ink levels by performing the procedure outlined on Inkjet411's site: http://inkjet411.com/?page_id=1915
To clean the HP 56, 57 or 58 ink cartridges please visit the Inkjet411 site which provides recommendations on how to clean the electrical contacts, flex driver cables and how to perform a hot water flush of the nozzle plate (refer to video): http://inkjet411.com/?page_id=1519

Jan 17, 2013 | HP DeskJet 5150 InkJet Printer

1 Answer

Poor print quality, not fully black with white lines through text/images.


The white lines are caused by some CLOGGED ink-jets that are not spraying the ink onto the paper at the appropriate time.

Start the Epson printer-software, and run a "print-head-cleaning-cycle", to try to UNCLOG those ink-jets.

Oct 17, 2010 | Epson STYLUS CX3900 All-In-One InkJet...

1 Answer

My kodak 5300 is printing poorly. one line will be normal and the next line will be real light...anything i can do..i have new ink and have tried all that i can think of... thanks


Here is a page for your software drivers and a firmware upgrade.
HOWEVER...This looks like the print head may be clogged. Try a deep clean cycle in the printer menu.
If any ink has been allowed to run out, or the printer has been idle for more than a 6 months, the print head is probably no good. Contact Kodak regarding a new print head.

Apr 19, 2010 | Kodak EASYSHARE 5300 All-In-One InkJet...

1 Answer

Printer output has shadows, blurring, streaks, lines, poor color


Seem like blocked hole(s) on the color print head...
Most likely if there is a deep clean option then do it (may need a few times to unblock a hole or never).
Also get the printer physically cleaned up if you can see dusts inside (vrtical lines on color bars).

Mar 20, 2009 | HP DeskJet 9800 InkJet Printer

1 Answer

Poor print quality


Hi Phil,

It sounds like you are low on ink oryou have a defective ink cartridge (dried-up).

Sep 14, 2008 | Office Equipment & Supplies

1 Answer

Horizontal colored lines through grayscale printed photos


Hi George,

It sound's like an ink-feed issue:

1) Dirty heads, even after cleaning
2) No-ink or poor quality ink
3) Damaged head: some are part of the cartridge, some are not
4) Air bubbles in ink

The test page is typically not as hi-res nor as saturated as a
photo print. The hi-res photo puts the greatest demand on the print head.

The color lines you see are actually lines of missing color,
where the head has failed to deposit ink, so one or two primary
colors are missing from the complete picture.

For example missing yellow will make a blue line.
Missing magenta will make a green line
Missing cyan will make a red line.... etc..

Clean the heads again and again, print again and again,
hoping to flush the system.

BUT, keep in mind that cleaning wastes huge amounts of
ink and tiny little cartridges of ink cost more than many new printers.

Martin

Apr 24, 2008 | Canon PIXMA iP90 Mobile Printer

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

2 Answers

Blue lines running through my image


Did u use the original ink cartridges or compatible ones or refilled?

Jan 18, 2008 | Epson Stylus CX6000 All-In-One InkJet...

1 Answer

Print quality problems


First off replace the ink cartridge.
then look into the menus of the printer and perform the head cleaning procedure.
Most of the time what you are describing is simply a cartridge out of ink and not showing empty

Nov 14, 2007 | Epson Stylus DX4850 All-In-One InkJet...

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