M3 (Developing) Control - Konica Minolta 7155 Service Manual

DEVELOPING UNIT

[3] M3 (Developing) Control

5V
P.GND
DEVM CONT
DEVM CLK
DEVM CW/CCW
DEVM GAIN
DEVM EM
PRCB
24V2
P.GND
DCPS
M3 (developing) is controlled by PRCB (printer
control board) and the motor drive power is sup-
plied 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.
M3
MS1 MS2
2-G-2
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% 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 indica-
tion signal
[H]: High speed range
[L]: Low speed range