Sometimes we can use the tool called TWACKER developed by the TWAIN Working Group to check data sources like scanners, cameras, etc.

TWACKER can be downloaded and installed here:
32-bit: http://www.twain.org/docs/Twack_32.msi
64-bit: http://www.twain.org/docs/Twack_64.msi

To use the tool:

1. First open the installed program:


2. Select your device:


If your device is not listed, please check if the driver is installed.

3. Choose the settings and try scanning: