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How to reset waste ink pad on Canon Pixma MP210

Error 5b00 means the waste ink counter is full, you need to reset it.
Solution:

Step 1: Download PCM Service tool.

Step 2: Enter in service mode in order to used the re setter:

• Turn off the printer without pulling the power cords.
• Hold down Resume button and press Power button
• Keep holding down Power button and let Resume button go
• Then Press Resume button 5 times then let both buttons go
• The Alternate Blinking error is gone, the printer is in Service Mode state

Step 3:

• Extract the PCM servive tool resetter and then double click "servicetool.exe"
• Click Reload Button and you will get a new USB port.
• Load some papers in your printer and press the "Main" Button, wait until it shows "error 001" then press OK.
• Then press "EEPROM" button and the printer will print some text, after that click OK
• Then power off the printer (sometimes you have to press twice the power button to turn off) and turn on again.