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You cannot empty the ink collector yourself. It won't work well if you do - a new one is necessary.
If you want to try it, then be sure to first empty it out of all toner powder, quite thoroughly.
Then wipe it off with a clean dry rag cloth (which will be ruined by the old toner.) Get it quite clean... using water in a quick wash will result in a royal mess. This may take 1/2 hour of repeated polishing. It must be quite clear to work at all again, or have any chance of it. I disclaim all responsibility for this procedure if you follow it - it is inadvisable and likely to produce problems.
As for the reset... after putting the ink collector (old or new) back in, on the machine's panel, go to
^ or v to
^ or v to
Screen should display RESET COMPLETE.
If the error message persists after this, the re-use is not going well, and you need a new ink collector.
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