XEROX - Excerpt from SIQA Instructor Guide

November 26, 2012

Note: This is an excerpt from the beginning of a 40-page training document prepared for Xerox field representatives

Aims and Objectives

This course provides users with the knowledge and skills needed to effectively calibrate a Xerox® C75 Color Press for optimal print quality. Upon completion of this course, the user will have a basic understanding of the calibration process, and will be able to correctly operate the press to calibrate it’s operation for each type of stock to be used.

How to Best Prepare

Print out this Instructor Guide and use it to take notes while reviewing other resources for trainers.

To complete the exercises, you will need the following:

  • Access to a fully configured and functioning Xerox® C75 Color Press.
  • A basic understanding of the normal operation of the press, including the proper use of the Control Panel, the document scanning platen, and the stock trays.
  • Access to a network-attached Personal Computer (PC) that has been configured with the Simple Image Quality Adjustment (SIQA) program.
  • Access to a printed Background Plate for use in the Alignment Adjustment procedure.
  • You will be printing a small number of calibration documents. Ensure that you have a sufficient quantity of blank stock. You will be using:
    • 8.5” x11” Uncoated 90 GSM paper for the Alignment Adjustment exercise
    • 11” x 17” Uncoated 90 GSM paper for the Density Adjustment exercise
    • Additional blank stock to place on the platen as part of the Density Adjustment scanning procedure

Exercises

All exercises include step-by-step instructions. For each exercise, be prepared to:

  • Define the feature in the exercise
  • Provide the benefits of the feature
  • Work through the exercise and demonstrate it
  • Debrief the exercise upon completion

Background

Simple Image Quality Adjustment (SIQA) is a set of maintenance programs and procedures that adjust the image quality of the printed images generated by the Xerox® C75 Color Press. These adjustments generate an individual profile for each stock to be used on the machine. The profile is then used each time the associated stock is used, ensuring optimal print quality.

SIQA performs two types of adjustments:

  • Alignment: The Alignment procedure generates an individual alignment profile for each stock used in the press. This profile ensures that the stock is aligned correctly as it passes through the press.
  • Density Uniformity: The Density Uniformity procedure also generates an individual profile for each stock to be used in the press. This profile ensures that ink is deposited uniformly and consistently across the entire surface of a page for each print.

The SIQA calibration tool runs on a network-attached personal computer. It does not run directly on the press. As a result, a central PC can be used to calibrate more than one press in the office.

Use of the SIQA tool is a multi-step process. Some of the steps occur at the PC, and some of the steps occur at the press. SIQA is run separately for each stock that will be used in the machine.

There are three sets of steps that are performed in calibrating C75 Color Press with the SiQA tool. Each of these is covered as a separate exercise in this training document. They are:

  1. Establish Communications: SIQA only operates in Administrator mode. You will log in as an administrator at the press Control Panel. Then you will launch the SIQA program on the PC, where you will connect SIQA to the press administrator account. This step need only be performed once per SIQA session. Multiple calibrations for different stocks can then be performed in sequence.
  2. Generate and Scan Calibration Charts: You will then generate and scan a number of Calibration Charts at the press. One set of scans is created for the Alignment Adjustment procedure, and a different set of scans is created for the Density Uniformity Adjustment procedure. These scans are stored in a special folder on the administrator account. They are used by the SIQA program to generate accurate profiles for the machine.
  3. Create the Stock Profile: At the PC, you will select a calibration procedure, and SIQA will retrieve the scans created in (1) above. SIQA will perform the calibration and generate a stock profile, which is then stored on the press under a descriptive name that you provide. This profile will then be used whenever the stock that you have profiled is used in the machine.

[continued]

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