The Original Scanning Area Is Dirty." Is Displayed Due To Poor Adjustment - Canon imageRUNNER ADVANCE C3330 Series Troubleshooting Manual

Copier Color | iR-ADV C3330/C3325/C3320 Series |
"The original scanning area is dirty." is displayed due to poor
adjustment
[Symptom]
" The original scanning area is dirty." may be displayed when an original is scanned from ADF.
[Cause]
If the adjustment of left (right) hinge height for the ADF is not proper, the document glass spacers do not come in contact with
the document glass.
When the document glass spacers are in the above state, the original in the ADF is scanned in the state of keeping afloat from
the proper scanning position. Therefore the image becomes darker and the dark part is wrongly detected as dust. That results in
the above symptom.
[Service work]
1) Check whether the rear-left side [a] and front-left side [b] document glass spacers are in close contact with the document glass
when the ADF is closed.
Cut a sheet of plain paper with a weight of around 80gsm to make a paper slip with a width of 45 mm, then use it to check the
height.
a) Check the rear-left height.
a-1) Set paper [a] against the protrusions of the stream reading glass [b] in such a manner that the sheet of the stream reading
glass [c] is nearly hidden.
[Caution] Set paper so that it does not reach the document reader [d].
a-2) Pull out the set paper in the direction of the arrow to check that slight resistance is felt.
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