Riso HC5500

4. Image defects caused by erroneous image adjustment performed by service personnel

Defective head angle adjustment

1. Head angle adjustment: After replacing a head, perform head angle adjustment.Refer to [Adjustment after print head replacement, 1-5 Execution of image adjustment]. If this manual setting of the head angle is performed incorrectly, image defects may arise.
2. Characteristic of image defects due to defective head angle adjustment 1. Deviation of horizontal single-color lines
   When the printed image is positioned so that the paper transport direction is vertical, the defect appears in the horizontal lines of a single color. An abnormality is seen in horizontal lines of a single color of K, C, M, or Y printed by the defective head. The horizontal lines of a single color printed by the misaligned head are slightly displaced. If there is more than one misaligned head, the horizontal lines of a single color will appear irregular. This defect is produced continuously from the top of the page to the bottom. This defect appears in every print. See the above diagram.
3. Characteristic of image defects due to defective head angle adjustment 2. Deviation of horizontal multiple-color lines
   When the printed image is positioned so that the paper transport direction is vertical, the defect appears in horizontal multiple-color lines. Multicolor horizontal lines show a color shift within the width of the misaligned head. This defect is produced continuously from the top of the page to the bottom within the width of the applicable head. In some images, the defect appears cyclically. This defect appears in every print. See the above diagram.
4. Corrective measure: Perform image adjustment, referring to [Adjustment after print head replacement, 1-5 Execution of image adjustment].