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ENWW Developing unit 67
MFP unit explanation
Gradation correction control
Gradation correction control is performed by
TCSB (toner control sensor board), M2
(drum), M3 (developing), and so on under
the control of PRCB (printer control board).
1 Operation
The gradation characteristics of the toner
density versus exposure amount at the
image-forming section (drum area) are
detected to obtain a linear relation
between the image density on a document
and the copying image density.
a Method
Exposure is performed with the laser
PWM varied in several steps, and
development is performed at the sleeve
speed obtained by Dmax (maximum
contrast) correction.
Next, each density is read by the γ
sensor (PD2) on TCSB (toner control
sensor board) to detect the gradation
characteristics of image density.
The gradation characteristics obtained
here are used as the values for
correcting the laser exposure amount.
PRCB
TCSB
DCPS
24V2
P.GND
12V2
S.GND
MS1 MS2
M3
M2
5V
P.GND
DEVM CONT
DEVM CLK
DEVM CW/CCW
DEVM GAIN
DEVM EM
5V
P.GND
DRUM CONT
DRUM CLK
CW/CCW
DRUM EM
12V
A.GND
G SIG EX
LED CONT
TNLED REF