Hello, please operate as follows:
Press the 【OK】 key to enter the menu options, select 3 for Calibration, and press the 【OK】 key. The printer will print a calibration effectiveness chart. Follow the on-screen instructions to place the chart on the scanning part, then press the 【Start/Power】 key. The machine will calibrate automatically.
If the calibration is not successful, check whether the chart is missing colors or if there is a fault with the glass platen.