Question about Canon PIXMA MP780 All-In-One InkJet Printer
Where is waste ink tank and how do you fix the problem
Try resetting printer as follows.
Reset Waste Ink
1) Enter SERVICE MODE.
By pressing Menu, Copy, Scan, Copy, Copy
2) Select TEST MODE.
3) Select  PRINTER TEST in TEST MODE.
4) Select 3. [EEPROM CLEAR].
5) Select 0. [INK COUNT].
6) Press the [Set] key.
7) Press the [Stop/Reset] key (returning to the state of 3)), and then press the [ON/OFF] key.
Posted on Jul 03, 2008
SOURCE: waste ink tank full
normally, the logical solution is to replace your waste ink tank, but I have tried a solution which could make your canon printer function again.
Try this: With your printer turned ON, press and hold the I/O switch then pull off the power cord. This will turn off your printer. But without lifting your finger on the I/O switch put back your power cord. the I/O switch will blink for a second and will go off, then turn-on your printer again and see if it works.
Posted on Oct 06, 2008
SOURCE: Waste in ink tank near full
There no easy way the printers are been made this way so you take them to the shop, but if you are handy with your hands and know what you are doing then you will need to take all apart and take out the ink pads inside the printer and clean them up make sure they nice dry when put back in, then you are going to need a program that you can find on the internet it will be called waste reset tools, or your printer will not work even after you done the clean out.
I am not sure what canon you have so I cant tell you the tools you need for yours, i have got canon MP-Tools on my website if this is the one you need.
with this you can reset the waste ink tank before you do the clean out but remember in time you will need to clean out or it going to be a big mess of ink coming out your printer.
Click Link = http://www.4all2sell.com/reset-tools/MPTool.exe
All I ask is please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
All The Best: Pineworks
All files on my website are only there for a limited time
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
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