Tests
Introduction
Before the start of production, the printer and paper processor must be carefully calibrated to produce only the highest quality prints.
The purpose of the printer calibration is to align the individual elements of the KODAK PROFESSIONAL RP 30 Laser Printer – print engine, paper, and paper processor – with respect to each other. The result of a successful calibration is the neutral appearance of the grayscale on the last test print.
You can perform tests for the RP 30 Laser Printer before or during production. For example, a Paper Balance (PBL) test is required when paper with a new emulsion number is inserted.
This chapter provides details about these tests.
Printer Tests
Overview
MBL
The Master Balance (MBL) is the means to keep the production stable and uniform. This provides consistent, every day compensation for chemical fluctuations and/or changes in the paper process.
The MBL is printed on the “master” paper, which is the paper that is used most frequently in the lab. The MBL then calibrates the master paper directly. Based on the changes determined on the master paper between the last and the current MBL, all other paper styles are adapted. Therefore, any change in the MBL influences all paper configurations.
PBL
The Paper Balance (PBL) test compensates for the differences among the various paper types and widths, and provides for uniform rendering of the colors on all paper emulsions in use.
The PBL calibration only applies to the paper on which the PBL is printed. Other paper styles are not affected. Every paper configuration (for example, every individual cassette code) used for production must be calibrated.
The PBL consists of two steps:
1.The working point of the laser and the maximum densities are determined for the paper. Usually this step is only required once, when the PBL is determined for the first time. For this purpose, the test print’s graded densities and halo print are exposed.
2.The PBL test print is used to adjust a neutral grayscale. Several cycles are usually required.
KODAK PROFESSIONAL RP 30 Laser Printer |
