Canon ScanFront 400 Instructions Manual page 190

Cannot turn on the power
The scanner does not turn ON
when the power switch is
pressed.
An "invalid password" error
message appears even when
the correct password is entered.
Hardware
The AC adapter is not connected properly or the power plug is not
Cause
inserted.
Check the connections of the AC adapter and power plug. If the
Solution
problem is not resolved after checking the connections, contact your
local authorized Canon dealer.
Cause A USB memory device in inserted in the scanner.
Solution Remove the USB memory device, and restart the scanner.
The date and time settings on the computer and ScanFront 400 do not
Cause
match.
Match the date and time settings on the computer and ScanFront 400. If
there is a discrepancy of 2 minutes or more when the date and time
Solution
settings on the computer and ScanFront are converted to Greenwich
Mean Time, an "invalid password" error message will appear.
190
Chapter 9 Troubleshooting