Canon iR C6800 Series Service Manual page 927

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Chapter 13
5) Once again, generate test prints (COPIER>TEST>PG>TYPE=1), and compare the output against the output
generated in step 3), thereby making sure that improvement has been made.
Note:
Make copies using the CA 1 Test Chart and an appropriate original of the user. If the image contrast has adversely
been affected, increase the setting using the foregoing service mode item (range of settings: 31 and 49).
After you have performed the foregoing remedy, be sure to execute auto gradation correction (full; image
characteristic correction control) in user mode.
Description
This symptom tends to be conspicuous in M or C when making full color prints (halftone). In the case of M, the
symptom tends to occur about 25 to 30 mm from the leading edge of the image; in the case of C, on the other hand,
it tends to occur around 50 to 60 mm from the image leading edge.
Image Sample
F-13-43
13-55

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