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64 MFP unit explanation ENWW
M3 (developing) is controlled by PRCB
(printer control board) and the motor drive
power is supplied from DCPS (DC power
supply unit).
1 Operation
M3 (developing) is a DC motor driven by
24 V. It drives the developing sleeve,
agitator wheel, and agitator screws.
M3 turns on when the PRINT button is
pressed, and turns off after lapse of the
specified time from turning off of the
charging.
2 Signals
a Input signals
1 DEVM_EM (M3 to PRCB)
M3 (developing) abnormality
detection signal
[H]: Abnormal rotation (when motor
speed changes by 6.5 percent more
or less than the motor speed
specified value)
[L]: Normal rotation
b Output signals
1 DEVM_CONT (PRCB to M3)
M3 (developing) drive control signal
[L]: M3 on
[H]: M3 off
2 DEVM_CLK (PRCB to M3)
M3 (developing) rotational speed
control clock signal
3 DEVM_CW/CCW (PRCB to M3)
M3 (developing) rotational direction
indication signal
[H]: CW direction rotation
[L]: CCW direction rotation
4 EDVM_GAIN (PRCB to M3)
M3 (developing) rotational speed
range indication signal
[H]: High speed range
[L]: Low speed range
Developing bias control
The developing bias voltage is supplied from
HV (high voltage unit) and is controlled by
PRCB (printer control board). The output
level of the developing bias voltage is
transmitted using 8-bit serial data. This serial
data includes the level information for all
outputs driven by HV, excluding the ON/OFF
control signal. Accordingly, a separate signal
line is provided to turn on/off only the
developing bias.
1 Operation
Application of the developing bias voltage
starts after a lapse of the specified time
from turning on of the START button, and
stops after a lapse of the specified time
from turning off of PS43 (leading edge) by
the last copy paper.
Developing bias output range: -300 V to
-700 V
2 Signals
a Output signal
1 B.CONT (PRCB to HV)
Developing bias output ON/OFF
control signal.
[L]: Developing bias on
[H]: Developing bias off
PRCB
DCPS
24V1
P.GND
BIAS
HV
B.CONT
TXD
CLK
LATCH