Oki C941DP Adjusting the Print Position for Spot Color Overprint

Adjusting the Print Position for Spot Color Overprint

When printing white under the color, misalignment or shrinkage may occur depending on the paper in use. In this case, adjust the registration and image size by following the procedure below.

Note

The adjustment of image size can be done when printer driver version 1.0.3 or later and firmware version A01.07_0_4 or later is combined.

You can check the version of Windows PS/PCL/XPS printer driver by clicking the [Version Information] button in the setting screen.

You can check the version of Mac OS X PS printer driver by opening [System Preferences] > [Print and Scan] > [Option and Supply] from the

Apple menu and going to the [General] tab > [Driver Version].

You can check the version of the firmware by selecting [Printer Information] > [System Information] > [Firmware Version] from the control panel menu.

Reference

To locate the button of [Version Information], refer to the "List of Printer Driver Features" of "Useful Features" in the C941dn User's Manual.

Adjusting Registration and Image Size

Note

Misalignment or shrinkage of image size differs depending on the paper and paper tray. Please use the paper and paper tray that you will use in actual printing for test print.

1	Set the paper in the paper tray.
2	Set the paper tray you are using in [Paper Feed Tray] from the control panel.
	(1)	Press the [Fn] key, [8], [0], and press the [OK] button.
3	(2)	Select the paper tray you want to use, and press the [OK] button.
	Set the paper weight, paper size, and paper type of the paper you want to use using the control panel.
4	Press the scroll button or .

5 Select [Print Information], and press the [OK] button.

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6

7

Select [Test Print-3], and press the [OK] button.

In the test result, compare the degree of misalignment between the black and white lines in the center.

Paper operation direction

Memo

If the black line is hard to read, use the white line that corresponds to the line of color easy to read.

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8	Adjust the registration of black lines to the white lines.
	The following figure illustrates a case where deviation occurs.

(1)	Check that 0.75 mm is adjusted in the direction of X (+) and 0.05 mm in Y (-) based on the
	following direction adjustment figure.

-0.5 mm

+0.75 mm

Registration adjustment diagram

(2) Press the [Fn] key.

The number input screen appears.

(3) Enter the function number of the paper feed tray to be set.

For the multi-purpose tray

Press the function number [2], [2], [0], and press the [OK] button.

For Tray1

Press the function number [2], [2], [1], and press the [OK] button.

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Memo

The function numbers for trays 2 to 5 are described below.

––For Tray 2

Press the [Fn] key, [2], [2], [2], and [OK].

––For Tray 3

Press the [Fn] key, [2], [2], [3], and [OK].

––For Tray 4

Press the [Fn] key, [2], [2], [4], and [OK].

––For Tray 5

Press the [Fn] key, [2], [2], [5], and [OK].

(4)Select [Overprint X Adjust], and press the [OK] button.

(5) Press the scroll button or , select [+0.75], and press the [OK] button.

Memo

The adjustment range is from -2.00 mm to +2.00 mm in the step of 0.25 mm.

(6)	Press the [BACK] button.
(7)	Press the scroll button or , select [Overprint Y Adjust], and press the [OK] button.

Memo

The adjustment range is from -2.00 mm to +2.00 mm in the step of 0.25 mm.

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(8) Press the scroll button or , select [-0.50], and press the [OK] button.

9	(9)	Press the [ONLINE] button.
	Check the degree of shrinkage of white image size of color image from the print result of Step 6 (Test
	Print 3).
	(1)	Select the two black lines separated as much as possible from among the lines along the
		direction of the paper.

Paper operation direction

(2)			X-Direction
	Measure the black line interval and the corresponding white line interval, and work out the
	shrinking percentage of X-direction by using the following formula.

"White line interval ÷ Black line interval"

White line interval: 238.3 mm

Black line interval: 239.8 mm

238.3 ÷ 239.8 = 99.37% : Shrinking percentage of X-direction

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