M2 (Drum) Control - Minolta Di551 Service Manual

DRIVE SECTION

[3] M2 (Drum) Control

5V
P.GND
DRUM CONT
DRUM CLK
CW/CCW
DRUM EM
PRCB
24V2
P.GND
DCPS
M2 (drum) is controlled by PRCB (printer control
board) and the motor drive power is supplied
from DCPS (DC power supply unit).
1. Operation
M2 (drum) is a motor driven by 24 VDC. It drives
the drum, toner guide roller, toner conveyance
screw, and separation claw swing. The flywheel
mechanism adopted for M2 ensures accurate
and steady rotation.
M2 starts rotating when the START button is
pressed and stops when the specified time
lapses after completion of second paper feeding
of the last copy.
When either one of the front-left and front-right
doors of this machine opens, MS1 (interlock MS/
R) or MS2 (interlock MS/L) actuates to stop sup-
plying the DC power to the motor, causing M2 to
stop.
M2
MS1 MS2
2-B-2
2. Signals
a. Input signal
(1) DRUM_EM (M2 to PRCB)
M2 (drum) rotation abnormality detection signal
[H]: Rotation error (when motor speed changes
by 6.5 % more or less than the motor speed
specified value)
[L]: Normal rotation
b. Output signals
(1) DRUM_CONT (PRCB to M2)
M2 (drum) ON/OFF control signal
[L]: M2 ON
[H]: M2 OFF
(2) CW/CCW (PRCB to M4)
M2 (drum) rotational direction switchover signal
[L]: CW rotation
[H]: CCW rotation
(3) DRUM_CLK (PRCB to M2)
M2 (drum) rotational speed control clock signal