Canon iR8500 Servise Manual page 59

If the message is indicated, advise the user to clean the copyboard glass where the CCD
stops. A label is attached to indicate the stream reading points for small-size and large-size
at the rear of the copyboard glass.
When a jam occurs, dust detection will not be executed at the end of a job. If the job is
cancelled, dust detection will be executed at the end of the job.
Point of reference
for small-size
Any of the following conditions can cause the Clean message to appear in
the absence of dust on the glass:
• The feeding belt of the ADF is excessively solid.
• 'CCD-ADJ' or 'LUT-ADJ' is not executed properly.
If such is the case, clean the belt and execute 'CCD-ADJ' or 'LUT-ADJ'
once again.
COPYRIGHT© 2001 CANON INC.
185mm
385mm
Cleaning points
F02-201-07
2000 2000 2000 2000 CANON iR8500 REV.0 MAR. 2001
CHAPTER 2 NEW FUNCTIONS
Label
Point of reference
for large-size
2-13