HP Designjet T1120 SD-MFP Guide De Référence Rapide page 32

NOTE: It is important that you clean the glass before calibrating the scanner.
1. Turn the scanner off and clean the scan area. Calibration works best with a
clean scanner.
2. When you have finished cleaning the scan area, turn the scanner on. The
scanner is ready for calibration when the power LED on the scanner's panel
lights green.
3. Press Options > Calibrate Scanner to start the Scanner Calibration Wizard.
4. The Scanner Calibration Wizard guides you through the procedure for scanner
calibration. To calibrate the scanner, you need the maintenance sheet that
came with your scanner.
28 Chapter 3 Maintenance ENWW