Ricoh Beluga-C1 Training page 166

LPH Replacement and Adjustment
LED Head 2
Slide 166
LPH REPLACEMENT AND ADJUSTMENT
What are these settings?, continued
The diagram shows the LPH unit, above the drum.
There are three heads, LPH 1, LPH 2, and LPH 3. LPH 2 is in the centre.
Clearly, they are not in the same position above the drum in the sub scan
direction.
Two of the heads (LPH 1 and LPH 3) are almost (but probably not exactly)
in the same place, but the gap between these and the central one (LPH 2)
is considerably larger.
SP 2952 011 and 012 tell the machine the misalignment between the three
heads in the sub-scan direction. The machine will adjust the writing timing for
each of the heads, using these settings, to make sure that each scan line of the
latent image is written across the drum correctly.
We will see this more clearly later during the adjustment procedure in the
manual.
LED Heads 1 and 3
166
Beluga-C1/C1.5 Training