Oki OKIPAGE 12i Maintenance Manual page 39

The LED driver (MSM6731BWAF) corrects the LED illumination by controlling the LED current. The LED
illumination can be set in 16 steps, with 7 steps in the direction of illumination increase in relation to the
standard value, and 8 steps in the direction of decrease. For this reason, the LED correction data is a
4-bit data for each dot.
The relationship between the LED correction data and LED current correction steps with the LED driver
(MSM6731BWAF) used in an LED head is shown below.
40718301TH Rev.6
LED Correction Data
Correction Data
msb b3 b2 b1
1 0 0
0 1 1
0 1 1
0 1 0
0 1 0
0 0 1
0 0 1
0 0 0
0 0 0
1 1 1
1 1 1
1 1 0
1 1 0
1 0 1
1 0 1
1 0 0
Correction Correction
Step Mode
lsb b0
0 +16%
1 +14%
0 +12%
Correction by
1 +10%
increasing
0 +8%
illumination
1 +6%
0 +4%
1 +2%
0 0% No correction
1 -2%
0 -4%
1 -6% Correction by
0 -8% decreasing
1 -10% illumination
0 -12%
1 -14%
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