Canon 4.1 User Manual page 62

Problem: Scan button cannot be selected
Solution 1: A scan cannot be performed if the scan area is set too small (less
than 64 x 64 pixels). Increase the size of the scan area
Solution 2: A scan cannot be performed unless a scan area is specified. Specify a
scan area
Solution 3: A scan cannot be performed if the required memory is larger than
the free memory. Change the resolution
( p. 30)
Problem: The "Insufficient Memory" error message appears when
scanning
Solution 1: Select the smallest possible area and rescan
Solution 2: Lower the resolution and magnification settings for the output
device to the lowest possible values
Solution 3: Rescan after closing all the application programs other than the one
used to start Plug-in Module CS-U
Solution 4: Rescan after you have restarted the application program used to
start Plug-in Module CS-U
Solution 5: Quit the application program used to start Plug-in Module CS-U and
increase the memory allocated to it. Click the application program
icon once. Then open the [File] menu, choose [Get Info], and choose
[Memory] from the submenu. Increase the memory in the Preferred
Size box to at least 16,000 K.
Solution 6: Increase the amount of RAM as required
Problem: The [Image] menu [ColorSync] option cannot be used in
Plug-in Module CS-U
Solution: ColorSync is not recognized after Mac OS upgraded to Version 9
after Plug-in Module CS-U was installed onto Mac OS 8.6. Reinstall
Plug-in Module CS-U
until the required memory is lower
( p. 6)
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( p. 19) or scan area
( p. 19)