Znalazłem w sieci metodę resetowania. Może ktoś spróbuje, czy ona działa.
Resetting Canon Pixma MP520
Reset procedure for Canon Pixma MP520, posting by BilBg (bulgaria) in fixyourownprinter forum, procedure for resetting the Canon Pixma MP520 with button combinations. Some users in this forum which have tried this method (canon MP520 reset methode) say this method work on Canon MP520.
Here Procedure Resetting Canon Pixma MP520 (Picture by BilBg):
a. Switch the printer OFF
b. Press buttons 1 + 2 + 3 and 4 (simultaneously using four fingers)
c. Keep pressing this four buttons for 10 seconds
d. Release the On/Off button (number 4) (Keeping pressing the others)
e. After a few seconds (when the printer go ON) you can release buttons 1, 2, 3
A litte Notes by BilBg:
1. Maybe step “c)” is not needed
2. This procedure was used when I refilled the Black cartridge – try using the ColorCopy button instead of BlackCopy button (number 1) if you refill Color cartridge.
3. Maybe there is no need for all the four buttons – you can try 1 + 4, 2 + 4 or 3 + 4. (or 1+2+4, 1+3+4, 2+3+4)