Canon DR-5020 - Manual (Page 79)

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Error code C06
Cause The imprinter cover and endorser ED600 cover are open (with
imprinter and endorser ED600 installed).
Remedy Close the imprinter cover and endorser ED600 cover.
Error code C07
Cause The upper unit, imprinter cover and endorser ED600 cover are
open (with imprinter and endorser ED600 installed).
Remedy Close all covers.
Error codes E20, E21, E22, E23, E24, E25, E27, E28, E29, E30, E40, E41, E80, E85
Cause Unit internal error
Remedy The unit must be repaired by a service engineer. Turn the power
OFF, contact the store of purchase or a Canon service department,
and notify them of the error code.
Error code L01
Cause Too much data. Ran out of memory.
Remedy Press the Stop key to reset the counter to “0”. Optional memory
must be added on to use an extra function. Contact the store of
purchase or a Canon service department. For details on additional
memory requirements when extra functions are set, see “DR-5020/
5080C Scan Mode Tables.” (P.88)
Error code L02
Cause Too much data. Ran out of memory.
Remedy Press the Stop key to reset the counter to “0”. This error occurs if
you scan both sides of an A3/11" x 17"-size document. Either scan
one side of the document at a time, or change the scanning mode.
Error code U01
Cause Number of document sheets to be scanned exceeds set
number of sheets in the verify scan.
Remedy Two or more sheets may have been fed when the number of sheets
is counted. Press the Stop key to reset the counter to “0”. Check
the number of sheets to see if all document sheets have been
counted, and scan the document again.
4.5 When An Error Code is Displayed