Main Scan Adjustment: Led Light Level At Lph Joints; Adjusting Lph Alignment - Ricoh B286 Service Manual

SP Adjustments

Main Scan Adjustment: LED Light Level at LPH Joints

After you do the previous procedure to adjust the main scan at the LPH joints, you can do a
fine adjustment on this area. To do this, you increase or decrease the intensity of the light
from the four LEDs at the joints.
"500" is the default setting for LPH 1-2 and LPH 2-3.
! If you change the 2
moves the four LEDs by one position to the left.
If you change the 2
!
moves the four LEDs by one position to the right.
! If you change the 3
increases the quantity of light from LEDs 1, 2, 3, 4 in the illustration.
The quantity of light can be adjusted for each LED independently with SP2953 (Power
Correction). But, this fine adjustment is usually not necessary in the field.

Adjusting LPH Alignment

Broken lines [A] or [B] in the IPU Test Pattern (SP2902-2, Pattern 11) indicate incorrect sub
scan timing at one or both joints.
1. Go into the SP mode, and do SP2952-11 for LPH 1-2
! Adjust the position of LPH 2 (LPH 1 does not move).
B286/B289
nd
digit of the value for LPH 1-2 (500 to 510) with SP2952-1, this
nd
digit of the value for LPH 2-3 (500 to 510) with SP2952-2, this
rd
digit of LPH 1-2 or LPH 2-3 (510 to 512, for example), this
3-84 SM