on her computer. It looked like a relic from an older era of computing, but it was powerful. With a few clicks: She selected the active Ink Absorber Counter section, she chose She clicked
The Canon Service Tool V3400 (often shortened to ST-V3400) is a proprietary software utility designed to interface directly with a Canon printer’s EEPROM (Electrically Erasable Programmable Read-Only Memory). For technicians and advanced hobbyists, this tool is the key to bypassing service locks, resetting ink counters, and extending the life of a printer that would otherwise be considered "dead." canon service tool v3400
| Error | Likely Cause | Solution | | :--- | :--- | :--- | | | Printer not in Service Mode; USB driver issue; Wi-Fi interference | Re-enter Service Mode carefully. Disable antivirus/firewall temporarily. Use a different USB port. | | V3400 crashes on launch | Windows 10/11 security or compatibility | Run as Admin + Windows 7 Compatibility Mode. Try disabling Real-time Protection. | | Reset "Done" but error returns | EEPROM write failure or physical pad full | Try the reset again. If error returns after a few prints, your pads are critically full. Replace pads. | | Printer shows "Service Error 6A80/6A81" after reset | Mechanical issue (purge unit stuck), not ink counter | This is not a counter error. The V3400 will not fix this. You need mechanical repair. | on her computer