Ricoh Beluga-C1 Training page 173

Uneven Density between the Three
In the factory, SP 2943 is adjusted to make the output from
each block the same.
If the customer complains about unequal density across
the page, and if you can see that this is due to the three
different blocks of the LPH, then adjust SP 2943.
Slide 173
No additional notes
Blocks of the LPH
th
The 16 scale (darkest) of the grayscale is calibrated to be
1.3 ± 0.1.
But after this calibration, it is possible that density for other
levels in the grayscale are not exactly the same.
But, this SP adjusts all levels of the grayscale at one time for
each block, and the size of the change may not be the same
for each level of the grayscale. So, if you make the output
equal for one level, it may not be equal for another level.
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Beluga-C1/C1.5 Training