Release the button. The green light should flash and then stay steady, indicating you are in Service Mode . Step 2: Run the Software Extract the downloaded archive using a tool like WinRAR . Run Service Mode Tool V5204.exe as an Administrator.

The Canon Service Tool is not a consumer-facing software and is not officially hosted on public Canon support sites. Most available versions online are hosted on third-party sites and may contain malware.

Generates hardware-level nozzle checks and grid alignments to diagnose print head health.

Many users recommend buying a cheap, one-PC activation key from eBay to ensure you get a working version.

If you cannot find a safe link—or want to avoid the risks—here are better approaches:

If you attempt to use an older version of the Service Tool (like V3400) on a newer printer model, or if you press the buttons incorrectly while entering Service Mode, you can permanently lock your printer's EEPROM. This is known as "bricking" the mainboard, and the only fix is physically replacing the mainboard chip. The Physical Risk

The Canon Service Tool V5204 offers a range of features that make it an essential tool for Canon printer technicians and advanced users. Some of the key features include:

Assuming you have found a trusted copy (e.g., from a known technician), here is how to use it correctly: