One LED head has 26 LED chips. This chip mounts 8mm luminous element on itself.

  • If a vertical line 8mm in width appears on the image parallel to the direction of paper feed, it may be caused by a broken LED chip.

LED Positioning

The LED head contacts the spacer on the drum in order to hold and adjust a distance (focal length) from the PCDU (slide-move method).

  • The LED spacer contacts on the drum, where the drum wears out gradually as it rotates. If worn PCDU (out of lifetime) is used, its focus turns to be blurry gradually.

Image Position Adjustment

You can adjust printing position from each tray with [Registration] in Menu. At this time, the following controls are done as the adjustment in the machine;

  • Horizontal Scan: Adjusted by moving the whole image position.
  • Vertical Scan: Adjusted by changing the light-emission timing.

  • There is no mechanical adjustment as LD writing has.
  • Writing applies to the extent of the LED head to the horizontal direction. Hence if you want to adjust printing position to more extensive area than the one that is within setting range in [Registration], adjust paper position in the feed tray.

In paper position adjustment in the feed tray, you can adjust horizontal registration by loosening the screws on the bottom of the tray, and then moving the holder to right or left (up to 2mm).

  • When default (±0) position, the holder position is the triangle marked area [A] in the picture below.

LED Light Volume Adjustment

Adjusts the LED light volume by holding the data stored in the EEPROM on the LED head.

Adjustment at Replacement

Adjustment at LED head replacement is not needed due to the EEPROM on the LED board. This ROM contains light volume adjustment data.