Brother MFC5890CN Service Manual page 281

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
• Second black block printed in yellow or red
• Area expansion of block(s)
• Third blocks printed too light
• 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 blocks
(Vertical streaks only in 0.2 block is negligible.)
• Patchy color in 0.3 to 0.5 blocks
(Patchy color only in 0.2 block is negligible.)
• Missing dots in 0.2 to 0.5 blocks
D: Resolution chart
• Overlapping lines (diagonal or horizontal) in 4 to 6 mm blocks
• Curved lines in 4 to 6 mm blocks
• Black or color vertical streaks in 4 to 6 mm blocks
• Discoloration in 4 to 6 mm blocks
E: Whole page
• Ghost (image printed on the blank area)
• Color horizontal streaks
• Black vertical band
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