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

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Canon Pixma MP780 flashing "wait".

The ink cartridge is stuck in its right side position, won't budge. The screen is flashing "wait". I've turned it off, unplugged, replugged, uninstalled drivers, reinstalled drivers, checked computer settings, changed fax cable, is no paper jam, and no error messages other than "wait". Prior to this it was working but printing everything green, text, images, all pale green. Installing new Canon ink cartriges, troubleshooting steps, cleaning steps, calibration, etc., didn't resolve the green ink problem, didn't use it for a month, and when turned on recently got the "wait" and stuck cartridge problem. Canon said to send it in for service, as did all forums I've posted problem on. I have the feeling it's something minor, like a sensor or dust or? I'd like to take it apart and look for myself, but would like instructions to avoid damaging it further. Can anyone help? Thanks. Candace

Posted by on

  • cmgith Jun 15, 2008

    Hello Bubbabear64, thanks for the reply. No. the cartridge is stuck for sure, have tried to pull it but don't want to break it. If i take off the side panel is there a release for the cartridge that I could trigger or something like that? Thanks, Candace

  • cmgith Jun 16, 2008

    ok, then i'll take it in for service. if i open it up myself i'll void the warranty (it's only a year old). thanks for the time you took to read and answer my posts. i appreciate it. but on second thought, maybe it's just dust, so i think i'll take a peek, but then that doesn't explain the green print either, unless the black was dried up after being unused for a month or so, but then the new ink cartridges should have taken care of that. oh, what to do, what to do. but if this is all i have to complain about then I'd say i have a lot to be thankful for. thanks again, and I'll post back when it's been resolved either way, in case you're curious. Take care bubbabear, Candace.



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It could damage it further by taking it out. Not to mention messing up the timing of it.

Can you remove the ink jet cartidges from where it is parked at?

Posted on Jun 15, 2008

  • Tim Babcock
    Tim Babcock Jun 15, 2008

    Sometimes if that thing is parked in the home position it has a plastic lock in there and it's probably engaged.

    It really needs to be serviced. Judging from what you stated at the beginning of the request, I'm beginning to wonder if the main board is acting up.



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