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I didn't choose a cartridge to turn off. I just used the tip I found to press the off button for over 5 seconds ---- which got the result I wanted. And I always keep a spare cartridge on hand

I replace my black cartridges at the first sight of pale lettering. And my printer shows no sign of diminished results. In any case I appreciate your explanation of everything. Should I turn off the greyscale setting ?

I do believe I overrode the Ink Level Monitoring. I think such systems are seldom reliable or needed anyway. But there's no doubt I have been printing black only for over one year. I know I chose greyscale at some point

The "empty color cartridge" came with the printer and was emptied over a year ago. I've only printed in black since then Just today, on Canon Support, I found an on-line TR4520 printer manual (570 pages) I didn't know existed It took a while, but I discovered a tip (in the manual) related to...

I've been printing from a long succession of black cartridges, while my color cartridge is empty, with no problems Suddenly the printer won't print using the black cartridge. Instead, I get a popup saying "color cartridge is empty". What can cause this ? How can I make the black cartridge...