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72 MFP unit explanation ENWW
2 TONERM_CONT (PRCB to M13)
M13 (toner bottle) control signal
[L]: M13 on
[H]: M13 off
3 TONERM_CLK (PRCB to M13)
M13 (toner bottle) rotation speed
control clock signal
4 TONERM_CW/CCW (PRCB to M13)
M13 (toner bottle) rotational direction
indication signal
[H]: CW direction rotation
[L]: CCW direction rotation
M12 (toner supply) control
M12 (toner supply) is controlled by the
PRCB (printer control board). Toner density
is detected by TCSB (toner control sensor
board).
1 Operation
a Toner density detection
The Dmax (maximum contrast) sensor
(PD1) on the TCSB (toner control
sensor board) detects the density of the
toner control patch developed on the
drum surface to output the signal
corresponding to the detected density to
PRCB (printer control board).
b Toner supply
When the voltage detected by TCSB
(toner control sensor board) is below
the specified value, PRCB issues a
control signal to drive M12 (toner
supply). The relationship between the
paper size and toner supply time is
summarized in the following table:
PRCB
TCSB
DCPS
M12
12V
A.GND
DMLED CONT
DM MONI EX
DJLED CONT
DM SIG EX
DRUM JSIG EX
TNLED REF
TNSM24V
TNSM24V
TNSM A
TNSM AB
TNSM B
TNSM BB
24V1
5V2
S.GND
P.GND
Paper size Supply time (seconds)
A3 1.30
B4 0.98
F4 0.98
A4 0.65
B5 0.49
B5R 0.49
A5 0.33
11 by 17 1.30
8.5 by 14 0.98
8.5 by 11 0.65
5.5 by 8.5 0.49