Question about Canon PIXMA MP750 All-In-One InkJet Printer

2 Answers

Canon MP750 not printing

My 3e black ink is not printing at all anymore.  I did test runs and deep cleanings and still nothing prints in the test run for the 3e section.  What do i do?  Another guy on this website mentioned print head clog buster.  on this site:
http://www.shopdyesub.com/Clog%20Buster1.htm

Does this really work?  
Please help, I need my printer and soon!!!!

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  • mxaxnxdxa2 Sep 04, 2008

    Mine's doing the same thing.. it'll copy just fine because the black turns kind of a grey/blue.. but it won't print anything black. I've switched out both black ink cartridges, made sure they're seated properly, done all the maintanence on it.. still won't print. When I search "printhead", even on the canon website, it brings up ink tanks. Considering this is my office printer.. it's pretty much ruining my week.

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2 Answers

I have the same problem. The 3e Black looked fine, and the LCD said it was half-full, but would not print in the text pattern and nothing black prints. I replaced the 3e cartridge and it still doesn't work, and still says half full even though it is brand new. This seems to be a repeatable problem for the MP750.

Posted on Oct 07, 2008

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I had a similar problem. I put in a new ink tank but did not seat it properly. When I tried to print nothing came out. Worse yet, apparently it burned out those jets in the print head! A new print head fixed my problem. I got it on eBay and am very satisfied.

Posted on Sep 01, 2008

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Posted on Jan 02, 2017

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First, how old are the ink tanks, it could be clodged.
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Sorry this ain't a solution but it seems to be the only cash-free way to contact you. No problem not solved - though I have tried everything. Dismantled the printer; washed, dried and replaced the waste ink pads; washed the print head; blew compressed air through the print-head sponge; replaced the cartridge 3 times; printed hundreds of test prints. I can't think of anything else to do and so I think the only solution is to replace the printhead (probably not even available) or replace the printer. The latter is looking most likely.

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All the people in this forum with a Canon ink printer not printing black, especially if you tried replacing the print head and still have the same problem.

Your purge unit/capping assembly is most likely clogged. This can be caused by using crappy ink cartridges and by not using the printer for exptemely long periods of time.

You will have to disassemble the printer. First open the lid so the print head moves into the centre of travel. Unplug the power cord. Remove the upper case (can be hard to do, usually they're snap-together).

Remove one screw on either side of the print engine and remove the engine from the lower case. Unplug the cables that go from the main board to the purge unit (the large black assembly covered with old ink, located on the right side of the printer where the head usually would stop after you've finished using the printer and shut it off).

Now you have to remove that black purge unit from the right side of the engine. Usually there are two screws holding it in place.

Give the unit a bath, carefully removing old ink from everything so the unit looks like new. (be sure to remove the one motor first or you will ruin the motor). Check the bottom and make sure the two small clear rubber tubes are not clogged with old ink. Clean the absorber off (the pad in the lower case) if it has ink piled into a small hill shape.

If the tubes look like they might be clogged, you'll have to find a way to clear them out. I can do it in my shop, but it's too in depth to explain.

Reassemble the printer, connect to a PC and do a few deep cleans and print out a test page. Problem solved.

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We charge $45 CDN for a job like this.

Rule of thumb: If you can get it fixed at a shop for 1/2 prince of a new unit, go for it.

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