Troubleshooting Image Quality Problems; Marks (Vertical Streaks) On Prints And Copies Due To Scanning Problems - Ricoh D158 Service Manual

5. TROUBLESHOOTING

5.1 TROUBLESHOOTING IMAGE QUALITY PROBLEMS

5.1.1 MARKS (VERTICAL STREAKS) ON PRINTS AND COPIES DUE
TO SCANNING PROBLEMS
Marks on prints and copies are mostly due to dirt on the DF exposure glass [A], generally caused
by adhesive contaminants (such as ball point pen ink and correction fluid).
Compared to non-adhesive contaminants (such as paper fragments and eraser dust), adhesive
contaminants are more likely to lead to complaints from customers because of the following:

Vertical streaks caused by adhesive contaminants are more visible in terms of image quality.

Unless removed by cleaning, adhesive contaminants continue to produce vertical streaks,
while non-adhesive contaminants stop producing streaks after they are dislodged.

Many adhesive contaminants are difficult to remove by cleaning.
The ARDF DF2020 (D684) features a system (non-contact scanning) to reduce vertical streaks
caused by adhesive contaminants.
D158/D159/D160/D161/D170
Troubleshooting Image Quality Problems
5-1 SM