Canon imageRUNNER ADVANCE 4551i Service Manual page 320

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3. Check that the leading edge of the printed image is within the standard range.

Standard range: A </= 1 mm

< If the image is displaced toward trailing edge > < If the image is displaced toward leading edge >

Image leading edge of

4. If it is not within the standard range, make an adjustment with the following service mode

• FEEDER > ADJUST > DOCST2

If the printed image is displaced toward the trailing edge: Increase the value (by moving the image toward the leading

If the printed image is displaced toward the leading edge: Decrease the value (by moving the image toward the trailing

• Amount of change per increment: 0.1 mm

• Adjustment range: -50 to +50

5. Print the test chart again, and check that the image is within the ranges of the standard.

■ Magnification ratio adjustment

• There are two adjustment methods: One for reading the front side (Scanner Unit on the Reader side) and another for reading

the back side (Scanner Unit on the DADF side).

• This adjustment is performed by comparing the images printed by stream reading and Copyboard reading.

● Adjustment of the Paper Front Reading

1. Place a test chart on the Copyboard Glass of the connected equipment and print. This is called Print 1.

2. Place a test chart on the Document Pickup Tray and perform a 1-sided print. This is called Print 2.

3. Overlay the Print 2 onto the Print 1.

Leading edge of

printed image

Feed direction

Image leading edge of

Leading edge of

printed image

Feed direction

5. Adjustment

Troubleshooting