Ricoh SAVIN D0AP Service Manual page 597

LED Exposure
The LED head contacts the LED spacer on the drum in order to hold and adjust the correct focal
distance from the PCDU (slide-and-move method).
Image Position Adjustment
You can adjust the 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, unlike laser writing.
Writing is applied across the length of the LED head in the horizontal direction. If you want to
adjust to the printing position to an area that is outside the one that is within the setting range in
[Registration], adjust the paper position in the feed tray. (Side-to-side Registration
Adjustment in the Machine Paper Tray)
LED Light Volume Adjustment
An EEPROM on the LED head contains data which controls the light intensity of each element.
There is no adjustment.
Adjustment at Replacement
Adjustment at LED head replacement is not needed because there is an EEPROM on the LED
board. This ROM contains light volume adjustment data.
LED Head Cleaning
A new LED head cleaning mechanism is installed in this machine.
The LED unit is linked to the front door. Every time the front door is opened, the LED unit pulls
away from where it was in contact with the drum. At this time, LED [A] is wiped by the cleaning
brush [B]. This cleans the surface of the LED head automatically. Opening and closing the front
door four times can clean the LED head.
SM 7-35 D0AP/D0C4/D0C5/D0C6/M0BQ/M0D1