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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Its more then likely your purge unit hose is clogged.

If you can reach the purge units filters (thin porus thing that the printhead stops over when doing the cleaning) with a tweezers or long thin needle nose pliers. You will need a cup of hot water to dip the piece in once you remove it. let it float in the cup for a little bit while you take a q-tip and dab hot water onto the purge unit (the area where you removed the filter) turn the printer on and off a couple times til you see the purge unit **** the water down. Then replace the filter and and try to run a test print.

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Sounds like a badly clogged nozzle. If you are using aftermarket/refilled cartridges, the changes are the ink is not up to manufacturer specs and has dried and clogged the nozzle. The best way to clear this is to take a new black ink OEM cartridge and run the deep cleaning a number of times (at least 3) to see if the nozzle can be cleared. If you continue to use non-OEM cartridges, I would keep a set of OEM cartridges around for nozzle clearing purposes. Also, take the aftermarket ink cartridges back to the vendor and either get an upgraded cartridge or refund.
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I just posted this solution to two other, related questions. It may be time to try desperate measures!

I have a PIXMA MP750 and months ago my yellow ink stopped printing. I was only able to use the printer for black and white printing. Every once in awhile I would try multiple deep cleans, new ink cartridges, etc. etc. I talked to the very unhelpful folks at Canon who suggested a new print head ($70), but they couldn't guarantee this would actually work. They really thought it would be best just to buy a new printer.

Although I was feeling bad about adding yet another cheap printer to the landfill I'd pretty much decided to get a new printer. As a last resort I decided to use a suggestion I came across (at pcuser.com) to run hot water through the print head. It was easy to remove the print head (check your manual). I propped the head up in my dish drainer and ran hot water straight from the tap first through the end with the little circular parts and then through the end with the metal strips. I eventually used boiling water from the kettle.

As I poured water through one end I started to see yellow ink coming though the other end so I figured the ink had dried in the head. I kept pouring water through (from both ends) until the water ran clear. I dried the print head, put it back in with the cartridges and VOILA! after MONTHS without yellow ink it's working beautifully again!

If you've tried everything else and feel desperate enough to buy a new printer you might want to try this and report back.

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I'm not an expert but I go through a lot of ink.. I have found that even with new ink some of the tanks of ink aren't any good especially with compatible which i buy a lot of because it's a lot cheaper (ebay). With that ink I have gone through 10 cartridges in a row before finding one that worked correctly again (I mean out of 100+ cartridges hitting a run of 10 that where bad but the rest good.)

Also, a tech for epson once told me to hit deep clean 7 times in a row before a head check to clean their nozzles.. That has helped with my printer and at Fry's electronics, they have a cleaning solvent in kit, haven't tried it, but i have run alcohol through mine but I'm told that is very ******* the print head (dissolves the glue).

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