Skew, Skew, and More Skew

[GabiE-Xerox]

Hi,

You can use the procedure below:

Adjustments can be made to the image based on the alignment output of a document. Various adjustments can be modified, such as image position, magnification, and skew.

• The Xerox 700DCP is baselined for 90GSM 11X17 inch paper for all alignment parameters. The result of this is 90GSM media will fall within advertised specifications for trays 1 through 3. (example Lead Edge registration will be within plus or minus .7mm)
• The result of this baseline setup will be that all other paper sizes and weights will fall within a specification of plus or minus 2mm from Trays 1 through 3.  
• If the customer uses, for example, 12X18 300GSM coated media, the registration could vary by as much as 2mm
• As you can see it is very important that the customer knows how to set up a Custom Alignment Profile for a specific Media that they use…..

The Alignment Adjustment setting is based on the type, size and weight of the paper. For example, create a setting if you are experiencing skew while printing on Tabloid (279 x 432 mm / 11 x 17 in.) coated stock.

1. Make sure the paper size and type that will be used to adjust the alignment is loaded in the paper tray.
2. Press the [Log In / Out] button on the Control Panel. The System Administrator Login screen will be displayed.
   
   Enter the System Administrator Login ID.
3. Press the [Machine Status] button on the Control Panel. The Machine Status screen will be displayed.
4. Select the [Tools] tab.
5. Select the [System Settings] button. The System Settings screen will be displayed.
6. Under the Group Column select the [Common Service Settings] button.
7. Under the Features Column select the down arrow to display additional features then select [Maintenance] button.
8. Select the [Alignment Adjustment] button.
9. Select an unused type [Not In Use], and then select the [Change Settings] button.
10. Select [Name] then select the [Change Settings] button.
11.  Assign a useful name to this type by typing a name on the screen.  NOTE: It is recommended that a name such as “A4 Plain” or "11 x 17 Coated" be used to clearly identify the paper size and type. Select the [Save] button.
12. The Current Value Column will display the name you typed in
13. Print a sample printout to view the current settings.
1. Select [Sample Printout].
2. Select the paper tray that was loaded in step 1, and then select [2-Sided] followed by the required number of sheets from the Number of Sheets section.
   Note: it is recommended to run three prints and measure the third
3. Press the [Start] button on the Control Panel.
4. After the samples are printed out select the [Confirm] button on the Touch Screen.
5. Select close
14. Check the sample output, and adjust for Skew, Magnification and Print positions using the steps provided.
15. To adjust the Skew:

Side 1

1. Measure 2A and then measure 2B. If the measurements are different perform the following
2. Select [Skew], and then select the [Change Settings] button.
3. Enter a value for skew between -1.0 mm and +1.0 mm in .1 mm increments. If 2B is greater then 2A enter a negative value, rotates the image to the right, if 2A is greater then 2B enter a positive value, rotates the image to the left (see graphic on UI adjustment screen). Make sure you enter this value in the [Side 1 Box] using the UP/Down Arrow Buttons.
4. Measure 2C and 2D for 2nd side. Evaluate the same as side 1 in step #3.

Side 2

1. Make sure you enter this value in the [Side 2 Box] using the UP/Down Arrow Buttons.
2. Select the [Save] button.
1. Repeat step 13 to print another sample and verify that the adjustments have been made. If necessary, make additional adjustments as needed using steps 1-6 in the skew adjustment. .
2. To Adjust Perpendicularity

Side 1

1. Measure the dimensions of 3A and 3B (Red lines show measurement). If the measurements are different perform the following
2. Select Perpendicularity and select the [Change Settings] button
3. Enter a value for perpendicularity between –1.9 mm and +1.9 mm in .1 mm increments.
4. If 3B is larger then 3A enter a negative value to move the image to the right.  If 3B is smaller then 3A enter a positive value to move the image to the left (see graphic on UI adjustment screen). Make sure you enter this value in the [Side 1 Box] using the UP/Down Arrow Buttons.
5. Measure 3C and 3D for 2nd side. Evaluate the same as side 1 in step #10. Make sure you enter this value in the [Side 2 Box] using the UP/Down Arrow Buttons.

Side 2

1. Select the [Save] button.
1. Repeat step 13 to print another sample and verify that the adjustments have been made. If necessary, make additional adjustments as needed using steps 1-6 in the skew adjustment.

1. To adjust the Magnification:
1. Check the sample output and measure the magnification offset amount that occurred.

Side 1

Side 2

1. X direction Magnification Offset Amount = image reference length* (5A) side 1 or (5C) side 2, in the X direction minus the actual image measurement length of (5A) side 1 or (5C) side 2, in the X direction.
   *Note: on 11X17 inch paper the X image reference length is 412mm
2. Y direction Magnification Offset Amount = image reference length* (5B) side 1 or (5D) side 2 in the Y direction minus the actual image measurement length of (5B) side 1 or (5D) side 2 in the Y direction.
   *Note: on 11X17 inch paper the Y reference length is 260mm
3. Note: To calculate the “Reference Length” of any media take the actual length or width in Millimeters and subtract 20mm.
1. If the reference length is different then the actual measurement you can adjust as follows:
1. Select [X%] or [Y%], and then select the [Change Settings] button.
2. Enter the calculated percent offset amount of the X direction Magnification you measured in step 1, for Side 1 and Side 2. If the Magnification offset amount is positive, enter a negative value in the adjustment value field. If negative, enter a positive value (see graphic on UI adjustment screen).
   Note: the values input into the Change Boxes for side 1 and side 2 are percentages not the actual measured offset values. To change the X value for 11X17 inch paper approximately 1mm you would have to input a value of .250% into the change box. (1mm change divided by 412mm reference length = .00242). Use the Up/Down arrow buttons to make change
3. Enter the calculated percent offset amount of the Y direction Magnification you measured in step 1, for Side 1 and Side 2. If the Magnification offset amount is positive, enter a negative value in the adjustment value field. If negative, enter a positive value (see graphic on UI adjustment screen).
   Note: the values input into the Change Boxes for side 1 and side 2 are percentages not the actual measured offset values. To change the Y value for 11X17 inch paper approximately 1mm you would have to input a value of .375% into the change box. (1mm change divided by 260mm reference length = .00386) Use the Up/Down arrow buttons to make change
4. If the Magnification offset amount is positive, enter a negative value in the adjustment value field. If negative, enter a positive value (see graphic on UI adjustment screen).
5. Select the [Save] button.
2. Repeat step 13 to print another sample and verify that the adjustments have been made. If necessary, make additional adjustments as needed using steps 1-6 in the skew adjustment.
1. To adjust the Print Positions:
   
   NOTE: Adjust the position of the image in the lead edge and side edge direction in relation to the paper feed direction by 0.1 mm increments for each of side (sides 1 and 2). You can adjust up to 2.0 mm.
1. Check the sample output, and measure the print position offset amount that occurred. The offset amount will be 10mm minus the actual reading.
2. X Print Position: Measure 4A and 4C (from the lead edge of the paper to the line should be 10mm). If the measurement is less then 10mm specify a positive value to move the position of the image in the opposite direction to the paper feed direction. If the measurement is more then 10mm input a negative value to move the position of the image in the paper feed direction (see graphic on adjustment screen). Example if the actual measurement is 9mm the offset value will be +1mm; if the actual measurement is 11mm the offset value will be -1mm.
3. Y Print Position: Measure 4B and 4D (from the side edge of the paper to line should be 10mm) If the measurement is more then 10mm specify a positive value to move the position of the image toward the back of the machine. If the measurement is less then 10mm input a negative value to move the position of the image toward the front of the machine (see graphic on adjustment screen). Example if the actual measurement is 9mm the offset value will be -1mm, if the actual measurement is 11mm the offset value will be +1mm

 Side 1

1. To change the X Position
1. Select [X Print Position] and then select the [Change Settings] button.
2. Enter the value obtained for the offset amount in the X direction
   measured in step 1. The 4A value will be Side 1 and the 4C value will be Side 2. Make sure you enter these values in the correct Box using the Up/Down Arrow Buttons
3. Select the [Save] button

		Side 2

1. To change the Y Position
1. Select [Y Print Position] and then select the [Change Settings] button.
2. Enter the value obtained for the offset amount in the Y direction
   measured in step 1. The 4B value will be Side 1 and the 4D value will be Side 2. Make sure you enter these values in the correct Box using the Up/Down Arrow Buttons
3. Select the [Save] button.
1. Repeat step 13 to print another sample and verify that the adjustments have been made. If necessary, make additional adjustments as needed.
2. When no additional adjustments are required, select the [Save] button.
3. Select the [Close]
4. Select the [Log In/Out] button on the console.
5. Select [Log Out] on the Touch Screen

Good luck!

Gabi

[bronson@mimic.net.au]

Hi there,

I have this issue also, on 350gsm card stock. I have a new IBT and have made the maximum adjustments on the RIP and use a MAC but I think SIQA is only for PC. Any other mods I can make?

Cheers,

Bronson

[PrintWorker17]

Thanks for the help! I have a call in to our regular tech to replace the 2nd BTR, but I'm still having the specialist come out to look over the machine just to make sure nothing else is affecting our prints. 

[GabiE-Xerox]

Yes. That one. 2ND BTR can generate skew and mgnification issues.

[PrintWorker17]

I think I found it: is it the unit two steps to the left of the fuser? If so, the gears on that thing are chewed up. 

[PrintWorker17]

Forgive my ignorance, but where is the 2nd BTR located? I'm downloading SIQA now, thanks for the advice. 

[GabiE-Xerox · Accepted solution]

Hi,

Have you use for adjustment the SIQA tool? If not download and install it ( https://www.support.xerox.com/support/xerox-c75/downloads/enus.html?operatingSystem=win7&&associated... )

 And I think for what you said about the borders that you have an used 2ND BTR ( maybe it help also for skew ).

Gabi

[PrintWorker17]

Hey guys. First-time poster here, so bear with me. 

We're a very small print shop that does magnetic calendars. First off: I am aware that the C75 is not ideal for running the sort of magnetic stock I have, but it's what I have to work with. 

We're currently in the middle of our peak print season.  On both 11x17 and 12.5x18 stock, all of our images are coming out diagonally skewed AND with the right-hand border markedly larger than the left-hand border. We cut our magnets in-house and are having to discard far too many sheets because the borders are visibly off on about half the sheets. We just replaced our registration unit last month, we've done everything possible with the adjustment settings on the machine itself (most of which seem to do nothing), and our erstwhile tech has been out to look at the machine at least eight times. We even moved the far-left-hand unit (the one containing Tray 6, where we load our magnets) so that it was exactly even with the high-capacity feeder, and that didn't help either. I currently have a call out for a Tier 2 specialist, but I'm dead in the water until that can occur.

Having read through the forums for some time, I know that literally hundreds of factors can affect skew, but I'm seriously stumped and I have a perfectionist boss who really wants us back up and printing. Any advice would be much appreciated.