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

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Error 6800 screen shows hash hash 357

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Error code 357 has to do with the print head & waste tank.

You can try and fix it yourself by performing the following:

-Turn off the printer.
-Open the top & both doors.
-Manually slide the ink cartridge carrier to the left.
-When you look back where the ink parks you will see a rectangular white assembly with 1 long & 2 short plastic tabs standing vertically.
-clean these carefully with a cotton swab & rubbing alcohol. They don't have to be perfect.
-NOW HERE IS THE HARD PART. Carefully reach around to the back of this assembly & move it forward. It should slide front to back easily. If it doesn't it's probably stuck with some dried ink.
Once this is free, slide the ink tray back, close evedrything up & start your printer.
The problem should disappear

Posted on Nov 23, 2008

  • richtersg Aug 28, 2011

    In relation to this Flat white area mentionedm I found it well and trully stuck.
    I gave it a Bit more of a Tug to make it move once I did it sprang back and forth easily. Indicating it was indeed stuck with dry Ink.
    Need to get in there and really6 cleanit properly some how. Swabb it out.

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