Plustek SmartOffice PN2040 User Manual page 19

c. After you make sure the Scanner Search Tool is working properly and the
scanner connection status indicates Locally Connected, please click the OK
button to confirm the status and start the scanner calibration process.
Afterwards, please skip to procedure 12.
11. After the software is installed, you will be prompted to perform the scanner
calibration.
12. Insert the special calibration sheet into the ADF of the scanner.
13. Follow the on-screen instructions to complete the scanner calibration.
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