: Allows you to read and write EEPROM data, which is useful for checking the printer's detailed history, including total page counts and error logs.

While the software reset fixes the software lockout, it doesn't physically empty the ink. If you reset the counter multiple times without eventually replacing the felt pads inside, you risk ink leaking onto your desk or damaging the printer’s internal electronics.

And somewhere in the depths of a forgotten 2021 service tool, a line of code waits for the next trusting soul who just wants to clear an error.

Using the tool can occasionally trigger specific error codes if the execution sequence is incorrect. Error Code 006

By 2021, Canon had tightened security on their firmware. Older, "free" versions of service tools (like v3400 or v4720) often fail on the MB2140, sometimes even "locking" the service mode permanently if the wrong version is used. For a 2021-era setup, you typically require . These versions are designed to recognize the newer encrypted EEPROM chips found in the MB2140. How to Use the Tool Safely

Click in the Service Tool to print a diagnostic page confirming the counter reads D=000.0 .

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