Xerox DocuColor 7002, DocuColor 8002 User Manual

Version 1.0 August 2009

DocuColor® 7002/8002

Decurler Adjustment

2009 Xerox Corporation. All rights reserved. Xerox, Xerox Canada Ltd, Xerox Limited, and the sphere of connectivity design, DocuColor® are trademarks of Xerox Corporation in the United States and/or other countries.

Changes are periodically made to this document. Changes, technical inaccuracies, and typographic errors will be corrected in subsequent editions.

1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Decurler Paper Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2. Decurler Paper Type A-D Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Decurler Paper Type A-D procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

3. Decurler E Table Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Toner area coverage example 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Toner area coverage example 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Examples of upward/downward paper curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Light, Medium, and Heavy Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Light, medium, and heavy curl examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Entering values in the Decurler E Table fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Determining what values to enter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

How to enter values in the Decurler E Table Settings Type E window . . . . . 3-6

Example of entering values incorrectly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Example of entering values correctly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

4. Downward Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Creating a Decurler E Table Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Example of Downward Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Selecting the Decurler E Table Settings option . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Selecting a Decurler Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Selecting the E Table Settings button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Entering values in the E Table Settings window . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Entering the values to correct downward curl. . . . . . . . . . . . . . . . . . . . . . . . 4-5

Enter the value for the Lower 2 mm field 4-5 Enter the value for the Lower 6 mm field 4-6 Enter the value for the Lower 10 mm field 4-6

Saving your settings and returning to the Machine Defaults 2 screen . . . . 4-8

Activating the newly created Decurler E Table Setting . . . . . . . . . . . . . . . . . . . . . . . 4-9

Entering the correct job information for the programmed setting . . . . . . . 4-9

Print your job to determine if the paper curl is eliminated. . . . . . . . . . . . . . . . . . .4-11

5. Upward Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Creating a Decurler E Table Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Example of Upward Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Selecting the Decurler E Table Settings option . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Selecting a Decurler Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Selecting the E Table Settings button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Entering values in the E Table Settings window . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Entering the values to correct upward curl . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Saving your settings and returning to the Machine Defaults 2 screen . . . . 5-6

Activating the newly created Decurler E Table Setting . . . . . . . . . . . . . . . . . . . . . . . 5-7

Decurler Adjustment i

Table of contents DocuColor 7002/8002

Entering the correct job information for the programmed setting . . . . . . . 5-7

Print your job to determine if the paper curl is eliminated . . . . . . . . . . . . . . . . . . . 5-9

ii Decurler Adjustment

Overview

Before you begin

Tip

Please read all procedure.

When paper is exposed to heat, the paper loses moisture and curls toward the heat source. High toner coverage jobs tend to curl more than low toner coverage jobs. The system tries to reduce this by using mechanical devices within the paper path called Decurlers.

Paper curl is caused by many variables, including, but not in any particular order:

• The weight of the paper and whether it is coated or uncoated.

• The amount of dry ink/toner and the area being covered on a sheet: the heavier the coverage, the greater the tendency to curl.

• How the paper is loaded in the tray. Make sure you load the paper as instructed on the ream wrapper.

• The atmospheric conditions of the room where the paper is stored and where the printer is located, especially those related to humidity and temperature.

• The heat generated during the fusing processes.

the Decurler information before using the Decurler E Table Settings (E1 - E6)

Your system is designed with several automated settings to control curl. When using these settings the machine automatically sends paper through the proper Decurler:

• System Default: Automatically determines the amount of pressure needed at the different decurlers in order to reduce the output curl of the paper.

• Paper Type A, B, C, and D settings: Preset Decurler settings, which are manually selected as an alternative to the System Default setting. See “Decurler Paper Type A-D Settings” on page 2-1.

Decurler Adjustment 1- 1

Overview DocuColor 7002/8002

Tips

• While paper curl is caused by many variables, it is important to understand that the preset and custom Decurler profile settings use lookup tables for curl control that are based on the job’s percentage of toner area coverage and the printer’s humidity values, only

• With some print jobs, the output prints still may be curled more than you desire even after using the Decurler Paper Type A-D settings. In those cases, use the Decurler E Table Settings feature to compensate for paper curl in your prints. The Decurler E Table settings are based on job type and percentage of toner area coverage. These settings are manually entered. See “Decurler E Table Settings” on page 3-1.

• If a Decurler profile setting is changed, it remains at that setting until changed again manually. As an example, if you decide to use the Paper Type B Decurler setting, the setting will remain at Paper Type B until you change it to another setting.

• It is important to remember that a successful Decurler setting used today may not be the same setting that you would use on another day for the same file. This is especially relevant if the room in which printer is located experiences changes in temperature and humidity.

Decurler Paper Path

The Decurler has both upper and lower adjustment arms that apply pressure to the paper based on system defaults, selections made on the Decurler Setup screen (Paper Type A-D settings), or based on entries made on the Decurler E Table Settings screen. The degree of pressure is applied independently to the upward and downward Decurler arms.

1-2 Decurler Adjustment

Decurler Paper Type

A-D Settings

Overview

If paper curl is a problem, using one of the preset Decurler Paper Type A-D Profile Settings usually eliminates the problem. However, due to the broad range of paper variables, image coverage, and environmental factors, these default settings may not result in satisfactory performance.

Tip

Visit the www.xerox.com for your digital press:

• To determine if Xerox has tested your paper type and weight

• View the recommended Decurler Paper Type A - D settings for particular paper types.

web site and refer to the latest Recommended Materials List (RML)

The following table shows examples of the Decurler A - D Profile settings for particular stocks, which were taken directly from the Recommended Materials List for the DocuColor 7002/8002:

Decurler A - D Profile settings examples

Paper Type

Xerox Digital Color Supreme Gloss 8pt. Cover C1S A

Xerox Color Xpressions +, 32 LB B

Xerox Digital Color Parchment White, 24 LB. A

Xerox Digital Color Elite Gloss 100# Text A

Note

The settings recommended in the “Recommended Materials List for DocuColor 7002/8002” were developed from testing a wide range of paper samples, percentage of toner area coverage, and environments. The outcome of this testing is the preset parameters shown in the list, and these parameters refer to how particular papers interact with the digital press decurling system.

Decurler

Setting

Decurler Adjustment 2- 1

Decurler Paper Type A-D Settings DocuColor 7002/8002

If the System Default setting is not correcting curl, then you can use one of the Decurler Paper Type A - D settings, See “Decurler Paper Type A-D procedure” on page 2-2. For example:

• If the System Default is not correcting curl, select Decurler Paper Type A.

• If Decurler Paper Type A is not correcting curl, select Decurler Paper Type B.

• If Decurler Paper Type B is not correcting curl, select Decurler Paper Type C.

• If Decurler Paper Type C is not correcting curl, select Decurler Paper Type D.

• If System Default and Decurler Paper Type A, B, C, and D do not correct curl, you can use the Decurler E Table Settings, See “Decurler E Table Settings” on page 3-1.

Decurler Paper Type A-D procedure

If after using the System Default setting paper curl is still unacceptable, select an alternate Decurler Paper Type A - D setting:

1. At the controller, logon to the Tools menu as Administrator.

a. Press the Access button.

b. Enter the Administrator password.

Note

The default Administrator password is 11111. This password may be changed to fit your needs.

c. Press Enter.

2-2 Decurler Adjustment

DocuColor 7002/8002 Decurler Paper Type A-D Settings

2. The Pathway Option screen opens. Select the Tools Pathway button.

3. From the Tools Mode window, press:

a. Machine Defaults 2 tab.

b. Decurler Setup button.

4. The Decurler Setup screen opens.

a. From the Paper Tray menu, select the tray that contains the paper you are using on the

job. The default selection is Tray 1.

Note

If you have an optional SFM attached, Trays 3 and 4 also appear on this screen.

b. Select the job’s stock coating: Uncoated or Coated.

c. Make a selection from the Paper Weight range menu.

Decurler Adjustment 2-3

Decurler Paper Type A-D Settings DocuColor 7002/8002

d. The default Paper Type is automatically applied by the printer for the Paper Tray,

Coating and Paper Weight values you entered. Select an alternate Paper Type from Paper Type A through Paper Type D to change the amount of decurling applied. As an example, if the system automatically selects Type B, select Type C.

Note

The Type E settings are custom entered values that are explained in Chapter 3. While the Type E settings can be selected, they need to be programmed prior to selection. See “Decurler E Table Settings” on page 3-1.

e. Touch the Close button to save your selections and return to the Machine Defaults 2

screen.

Note

Tou c h t he Reset button on the Decurler Setup screen to return to the settings established when you first accessed the screen. As an example, if the system automatically selected Type B and you changed it to Type C, the system will return the setting to Type B.

2-4 Decurler Adjustment

DocuColor 7002/8002 Decurler Paper Type A-D Settings

5. Exit the Tools Mode.

6. Run a few test prints to determine if the curl was reduced to a satisfactory level.

a. If the curl is eliminated, continue running your prints using the specific Decurler Paper

Type A - D setting.

b. If curl remains excessive, try another Decurler Paper Type A - D setting.

c. If the curl continues after using each

Decurler E Table Settings profile procedure. See “Decurler E Table Settings” on page 3-

Decurler Paper Type A - D setting, continue to the

Decurler Adjustment 2-5

Decurler Paper Type A-D Settings DocuColor 7002/8002

2-6 Decurler Adjustment

Decurler E Table

Settings

Overview

While the system is programmed to correct for curl under most conditions, there may be instances where the pre programmed settings (System Default and Paper Type A - D) may not meet your curl requirements. Using the Decurler E Table Settings allows you to enter a percentage of toner area coverage range to help eliminate curl.

Notes

• The examples that follow are designed to give you an understanding of programming the Decurler E Table Settings option to obtain optimal results, but due to various job stock and environmental conditions the manner in which you achieve the best results may vary.

• The most important aspect for creating Decurler E Table Settings is determining the percentage of toner area coverage on the curled paper. A sampling of percentage of toner area coverage on some typical customer documents follows.

• The following percentage of toner area coverage examples have been measured using the particular application’s tools which created them. If you do not have access to an application’s tools, which measure percentage of toner area coverage, make your estimate using the following examples as a guide. Your estimates will be used when entering Decurler E Table Settings values, which is explained later in this section.

Decurler Adjustment 3- 1

Decurler E Table Settings DocuColor 7002/8002

Toner area coverage example 1

Percentage of Toner Area Coverage examples

Carousel Horses Bolivar Ltd. Dunn Report

Percentage of Toner Area

Coverage per Color

Black 30.5% Black 5.4% Black 10.8%

Magenta 28.1% Magenta 4.3% Magenta 8.5%

Cyan 23.8% Cyan 6.0% Cyan 8.5%

Yellow 29.5% Yellow 6.7% Yellow 7.2%

Percentage of Toner Area

Coverage per Color

Percentage of Toner Area

Coverage per Color

3-2 Decurler Adjustment

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