Top Cover Open; Print Cartridge Not Installed (Back-Side Imprinter); Print Cartridge Not Installed (Front-Side Imprinter); The Scanner Is In Doc Counting Mode - Fujitsu fi-7800 Operator's Manual

Also, note that the buttons on the operator panel are disabled while the ADF is open.
Confirm that the ADF is closed properly.
To check whether or not it is closed completely, open the ADF and then close it again.
For more details about opening and closing the ADF, refer to

Top Cover Open

When scanning is performed with the top cover open, the following error code appears on the LCD of the
scanner's operator panel.
U4:41 Top Cover Open
HINT
If you open the top cover while the scanner is ready, only an error message will appear without an error
code.
Also, note that the buttons on the operator panel are disabled while the top cover is open.
Confirm that the top cover is closed properly.
To check whether or not it is closed completely, open the top cover and then close it again.
For information on how to open and close the top cover, refer to

Print Cartridge Not Installed (Back-Side Imprinter)

When the print cartridge is not installed in the back-side imprinter, the following error code appears on the LCD
of the scanner's operator panel.
U6:B4 Print Cartridge Not Installed (Back-Side Imprinter)
Refer to the fi-680PRF/PRB Imprinter Operator Guide to install the print cartridge.

Print Cartridge Not Installed (Front-Side Imprinter)

When the print cartridge is not installed in the front-side imprinter, the following error code appears on the LCD
of the scanner's operator panel.
U6:BA Print Cartridge Not Installed (Front-Side Imprinter)
Refer to the fi-680PRF/PRB Imprinter Operator Guide to install the print cartridge.

The scanner is in Doc Counting mode.

The Scanner is in "Doc Counting mode" and therefore scanning cannot be performed.
Either press the [Stop] button on the scanner's operator panel to exit Doc Counting Mode, or press the
[Function/Enter] button on the scanner's operator panel to switch to Doc Count Check Mode, and start scanning
again.
Opening/Closing the ADF (page
Opening/Closing the Top Cover (page
171
Troubleshooting
26).
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