MP640 - After changing the ink-cartridge ,a message appear. "The following cartridge is unknown", U043

SOURCE: MP150 Error code 4 and 5

Don't use refill cartridges, because it will damage your printer someday. and will cost your parts as brand new. so better use the original ink.

TRY THIS STEPS...
Mp150 Reset Counter
Service mode operation procedures -
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks
0 time Green Power off
1 time Orange Service pattern print
2 times Green EEPROM print
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection
IF THIS STEPS DOESN'T WORK, YOU NEED TO BRING THE UNIT TO YOUR NEAREST SERVICE CENTER...

SOURCE: Canon Pixma MP610 CARTRIDGE PROBLEM

HI. Try holding the reset button for 6 seconds to overide the error. This may dissable the chip so it won't report but will allow you to keep printing. Simply check the ink tanks visually.

Refilling will give the same error too, again dissable the error.

Cheers Bob Monk (ink manufacturer [email protected])

SOURCE: error code: U150 The following ink tank cannon be recognized (Cyan)

U150 ink error fixed!

I too was getting the error for unrecognized ink cartridge. Then the little green circ board fell out of the end of the ink cartridge and it hit me that maybe if I put in the little green circ board from the old ink cartridge of the same color, then maybe the ink cartridge would be recognized. It worked! So don't throw out an ink cartridge that still has ink just because of that error and hold onto your empty cartridges in case you need the little green/gold circ boards.

This works!

found this helpful answer from an auto mechanic on...

justanswer.com

JustAnswer makes it easy to get...

SOURCE: Error U043 - Ink Tank Cannot be recognized

Try to open and close the main cover a bit, ... ink recognition will start and may solve the probleme ...
... otherwise remove the cartridge and clean the chip contacts e.g. with spirit
Maybe also pressing the stop/reset-button for >10s will also help to continue printing, but in this case the fill level of the cartridge will no longer be shown

SOURCE: MP500 ink tank cannot be recognized error U043

Same problem - two solutions I found helped me work out mine. One said contacts needed to be cleaned and it worked to use a Q-tip and alcohol or just click it in position several times until it recognizes the cartridge - this may work. Another said that they got it to work by installing a brand new cartridge - cool, but I have one full of ink it won't recognize. So I pulled the little circuit board off a used cartridge (like you need to do with some refills) and put it on the cartridge that it wouldn't recogrnize - works great. Still haven't figured out how to get it to acknowledge ink levels though. Canon really should be more consumer friendly since these problems seem to be intended to compel the use of proprietary cartridges.