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Re: waste ink tank
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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.
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You really need a service center for that, some have posted methods to reset here, but when the ink overflows it ruins the printer, and anything it leaks on.Canon customer service can tell you the nearest center. 1-800-828-4040.
The POWER Lamp Flashes Orange
Eight flashes: Waste ink tank almost full
The printer has a built-in waste ink tank for the ink used
during print head cleaning. Eight flashes indicates that the waste ink tank is
nearly full. Press the RESUME/CANCEL button to cancel the
error so you can continue printing. Before the waste ink tank becomes completely
full, contact a Canon service representative.
Canon recommends that you call for service as soon as this
error occurs. Once the waste ink tank becomes completely full, printing will no
longer be possible.
Inkjet printers have a fibrous pad inside them that collects the waste
ink from cleaning the print head. Over time, this pad fills up with ink
and can no longer hold any more. When this occurs, the printer
indicates a "waste ink full" error.
the waste ink absorption pads is something an authorized canon service
facility can take care of for you. Once they are replaced,
it'll be functional again.