3-18 Service Manual
5026
Skew (duplex)
This setting adjusts the duplex motor speed when it feeds through the aligning roll. It controls the skew between
the first scan line and the top of the page. Adjustments are made to the image that is facedown in the output
tray.
To set the Skew (duplex):
1. Select DUPLEX TESTS from the Diagnostics Menu.
2. Select Quick Test.
3. Select Single.
The test page prints.
4. Look at the dotted arrows at the top of the page. If the page is skewed on the page, select Skew.
5. For C746x, use or to select the skew setting you need to change, and press . For C748x, use
or to select the skew setting you need to change, and touch .
• Each increment shifts the skew by about 6 pixels at 600 dpi.
• The Skew (duplex) range is -50 to +50, and the default value is 0.
• An increase moves the image at the top right down the page. A decrease moves the image at the top
right up the page.
6. Perform Quick Test again to verify the adjustment. Check the page to see if the image on the page is still
skewed. If it is, repeat the adjustment.
Top Margin (duplex)
This setting controls the offset between the first scan line on the front of the duplex page and the first scan line
on the back of the page. The duplex adjustments are made to the image that is face down in the output tray.
Therefore, be sure to set the top margin in REGISTRATION before setting the duplex top margin. See
“Registration” on page 3-5.
To set the Top Margin (duplex):
1. Select DUPLEX TESTS from the Diagnostics Menu.
2. Select Quick Test.
3. Select Single.
The test page prints.
4. Hold the page to the light to see whether the top margin of the back aligns with the top margin of the front.
5. If they do not match, select Top Margin.
6. For C746x use or to select the margin setting you need to change, and press . For C748x, use
or to select the margin setting you need to change, and touch .
• Each increment shifts the duplex top margin by 1/100 of an inch.
• The Top Margin (duplex) range is -25 to +25, and the default value is 0.
• An increase moves the top margin down and widens the top margin. A decrease moves the top
margin upward and narrows the top margin.
7. Print the Quick Test again to verify the adjustment. Repeat until the front and back top scan lines match.
Left Margin (duplex)
By modifying this setting you can shift the image on the back side of a duplex page to the right or to the left.
To set the Left Margin (duplex):
1. Select DUPLEX TESTS in the Diagnostics Menu.
2. Select Quick Test.
3. Select Single.
The test page prints.
4. Hold the page to the light to see whether the left margin of the back aligns with the left margin of the front.
5. If they do not match, select Left Margin.
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