Most Epson adjustment programs require the printer to be in a specific "Adjustment Mode" to communicate with the software:

| Code | Meaning | Solution | |------|---------|----------| | E-01 | Printer not in Maintenance Mode | Re-enter mode (see Section 3) | | E-05 | Communication timeout | Check USB cable, restart PC | | E-12 | Counter reset failed | Perform EEPROM backup first | | E-21 | Head temperature too high | Cool printer for 30 min | | E-30 | Firmware mismatch | Update firmware before adjustment | | E-99 | Unknown logic board error | Replace main board + restore serial number via program |

Before you download or use any adjustment utility, keep these factors in mind:

Beyond simple counter resets, the program provides a comprehensive suite of maintenance tools that exceed standard consumer driver options: