Riso HC5500

5. Effects of parameters and image characteristics

Described below are image characteristics and the parameters that affect them. Note that defects caused by parameters tend to generate uniform symptoms (such as constant deviations). In the case of deviation of vertical multiple-color lines, for example, if the amounts of K and C deviations are uniform from the top to the bottom, the defect is due to improper parameters. This defect can be corrected by repeating image adjustment. If the extent of the deviation gradually increases farther down the printed page, the defect is most likely due to a paper transport problem such as paper skew. If so, remove the cause of the paper skew.

Print density differences among single-color heads

• Characteristics
  Differences in print density with the adjacent head occurs within the head width. The density difference is continuous in the paper transport direction within the width of the print head.
• Parameters that may lead to this problem
  •The recommended drive voltage (Voltage) entered is incorrect or inappropriate.
  •The recommended AL type entered is incorrect or inappropriate.
• Corrective measure
  •Check the recommended drive voltage (Voltage) on the Control panel and correct the setting.
  •Check the recommended AL type on the Control panel and correct the setting.
  •Perform image adjustment, referring to [Adjustment after print head replacement, 1-5 Execution of image adjustment].
  •Replace the defective print head (determine the defective print head by checking the color and position).

Frequent misfires of certain print heads

• Characteristics
  Certain print heads cause frequent misfires.
• Parameters that may lead to this problem
  The recommended AL type entered is incorrect or inappropriate.
  The print head is incorrect.
• Corrective measure
  •Check the recommended AL type on the Control panel and correct the setting.
  •Perform image adjustment, referring to [Adjustment after print head replacement, 1-5 Execution of image adjustment].
  •Replace the defective print head (determine the defective print head by checking the color and position).