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Confidential
(7) Check the copied chart, referring to the "Check Items on the ADF COPY CHART" given
below.
If any problem is found, remove the newly mounted ADF unit or ADF-related parts once
and set it (them) into place, or check and correct the connection of ADF-related harnesses.
Note: Since the resolution of the second side scanning CIS unit is low, the copied chart
may have stripes or streaks; however, it is not a problem. Check it, referring to the "Check
Items on the ADF COPY CHART" below.
Check Items on the ADF COPY CHART
Check that the copied chart has none of the following defects.
A: Contrast chart 1
• Black or white vertical streaks
• Patchy color
• Missing dots
B: Color blocks
• Patchy color
• In the second row, black block printed in yellow or red
• Area expansion of block(s)
• In the third row, blocks printed too dim to see
• Frames of white blocks missing or discolored
Note: Vertical streaks in color blocks are negligible.
C: Contrast chart 2
• Vertical streaks in 0.3 to 0.5 charts
(Vertical streaks only in 0.2 chart are negligible.)
• Patchy color in 0.3 to 0.5 charts
(Patchy color only in 0.2 chart is negligible.)
• Missing dots in 0.2 to 0.5 charts
D: Resolution chart
• Overlapping lines (diagonal or horizontal) in 4 to 6 mm charts
• Curved lines in 4 to 6 mm charts
• Black or color vertical streaks in 4 to 6 mm charts
• Discoloration in 4 to 6 mm charts
E: Whole page
• Ghost (image printed on the blank area)
• Color horizontal streaks
• Black vertical band
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