Question about Canon PIXMA MX870 Wireless Office All-in-One InkJet Printer

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My MX870 printer shows the 5100 printing problem, What do u suggest? Thankyou

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It can have a lot to do with some obstruction in the print path, the gears, or ink on the clear plastic encoder strip. The purge cap (the white sliding mechanism that the print head parks to when it's not in use) was not lubricated well enough from factory. If you lubricate the sliders with some white grease (don't get it on the small wipers or the black caps) the mechanism can now slide more freely, and the unit can park the head properly without giving you the dreaded head homing error 5100 (or E-2-2 on the LCD display) Keep in mind that this repair will probably require you to remove the right panel off of the printer to gain access to the purge mechanism. There are two screws behind the printer, and two in front for each corresponding side panel (the front screws are behind the grey front panel of the printer - open the top cover to see the clips which hold the front cover on).

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

Thanks, Joe

I’m happy to assist further over the phone at

Posted on Mar 25, 2011

Testimonial: "Great advice, but i am a bit afraid to take panels off because it is still under warranty. How stupid is Canon to say refer to the manual, you cant"

  • 1 more comment 
  • Anonymous Mar 25, 2011

    I have just turned the printer back on and turned it on its side, away from the direction where the cartridge carrier was going, and it fixed the problem, ( after using Joe's tip of oiling the runners, but i did not take any panels off!!!!! Yeh!!!

  • stevens_aman
    stevens_aman Jan 25, 2012

    I didn't remove any panels, but knowing where to look was my problem. Thanks to my one year old that likes to crawl all over the printer on the bottom shelf desk, I was able to remove a price tag that was stick so the ink couldn't even move! Thanks for the advice!

  • neveroddoreven Jun 02, 2013

    In addition to the toothed band that drives the cartridge carrier, there is also a clear plastic encoder strip attached to the cartridge carrier that runs horizontally through the carriage. This strip actually has fine optical black bars printed on it to tell the printer where the cartridge head is as it moves. In clearing a prior paper jam, I had accidentally transfered some of the carrier grease onto the clear encoder strip. This caused the printer to become confused when it couldn't read the strip, and caused the printer to make banging sounds and then register a code 5100. I resolved the issue by gently wiping the grease from the clear strip with a q-tip and alcohol, being very careful not to pull or stretch the strip.



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Also check the printer lead is ok

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