DEVELOPING UNIT
2-G-4
2 UNIT EXPLANATION
[5] Dmax Control
Dmax control is performed by TCSB (toner con-
trol sensor board), M2 (drum), M3 (developing),
and so on under the control of PRCB (printer
control board).
1. Operation
The purpose of Dmax control is to adjust the
maximum density to the reference level for each
machine.
a. Dmax control
(1) Method
Several latent images are created at the maxi-
mum laser power, images are developed with the
rotational speed of the developing sleeve varied,
then each density is read by the Dmax sensor
(PD1) on TCSB (toner control sensor board).
The developing sleeve speed detected when the
density has reached the reference level is
recorded as the optimum sleeve speed, allowing
developing to be performed at this sleeve speed.
(2) Timing
a) When the fixing temperature is lower than
122
°
F at SW2 (sub power) ON
b) Every 10,000 prints, upon completion of the
last job.
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
DMLED CONT
DM MONI EX
DJLED CONT
DM SIG EX
DRUM JSIG EX
TNLED REF
TEMP
3.3V2
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