1. Turn off printer
2. Hold down Resume button and press Power button.<-- more -->
3. Keep holding down Power button and let Resume button go.
4. Press Resume button 2 times then let BOTH buttons go...
5. Green lights will flash and then stop blinking.
6. When green lights are solid, press the Resume button 4 times.
7. Press the Power button and the printer should turn off, if not,
press the Power button once more.
8. Your printer should respond as normal.

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How To Reset Canon MP190

Reset Waste Ink full canon
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1) Enter SERVICE MODE. By pressing Menu Copy Scan Copy Copy
2) Select TEST MODE.
3) Select [8] 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
8), and then press the [ON/OFF] key