Canon imageRUNNER ADVANCE 4551i Service Manual page 322

5. If it is not within the standard range, make an adjustment with the following service mode
• FEEDER > ADJUST > LA-SPD2
If the image on the Print 2 is longer: Make the numeric value larger (by making the vertical scanning length of the image
shorter).
If the image on the Print 2 is shorter: Make the numeric value smaller (by making the vertical scanning length of the
image longer).
• Amount of change per increment: 0.1%
• Adjustment range: -30 to +30
6. Print the test chart again, and check that the image is within the ranges of the standard.
■ White level adjustment
1. Place a sheet of blank A4 or LTR size paper on the Copyboard Glass and close the ADF.
CAUTION:
When executing the white level adjustment using paper with smaller width, adjustment may not be executed properly.
2. Execute the service mode item.
• COPIER > FUNCTION > CCD > DF-WLVL1
3. Remove the blank paper from the Copyboard Glass, and place it on the Document Pickup Tray of ADF.
4. Execute the service mode item.
• COPIER > FUNCTION > CCD >DF-WLVL2
5. Place the blank paper on the Copyboard Glass again and close the ADF.
6. Execute the service mode item.
• COPIER > FUNCTION > CCD > DF-WLVL3
7. Remove the blank paper from the Copy Board Glass, and place it on the Document Pickup Tray of ADF.
8. Execute the service mode item.
• COPIER > FUNCTION > CCD > DF-WLVL4
■ Hinge pressure adjustment
1. Open the ADF, and find out the lowest position it stays open without holding it by hands.
2. Find out if the height of the position checked in step 1 is within the standard range.
Standard range: 19 cm or more
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5. Adjustment