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this is how to Reset Canon MP520

First thx to BilBg, this is how to Reset Canon MP520 First look at photo:
(red colored numbers 1...4 added by me)

I refill cartridges for inkjet printers for about 12 years (since 1996).
One of my customers found this procedure for resetting the Canon Pixma MP520
by experimenting with different button combinations.

(by his words long (10-15 sec.) pressing of just one (any) button doesn't work -
for many Canon Pixma models pressing the PaperEject, Cancel or OK button for 10 sec.
resets the ink level or ignores it)


Procedure:

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

Notes:

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)

Best wishes from Varna, Bulgaria