Oki Okipage 8p, Maintenance Manual, Page: 140 / 190

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3.8 Motor and clutch control
The electromagnetic clutch is driven by a control signal from the CPU and the drive circuit shown
below.
The main motor is driven by the control signals from the CPU and the driver IC.
(1) Main motor
M
CPU
DMPH1P
DMON1N
Motor
+5V
+5V
+5V
23 22 28 15 10 21 20 TAB 5
+5V
+5V +26V
ENA A
SW1 SW3
SW4 SW2
SW1 SW3
SW4 SW2
Out1
MTDV
Out2 Out3
Main Motor
Current
Sensor
Current
Sensor
ALARM Out4 Vmm A Vmm B
ENA B
DECAY
PHASE A PHASE B
0V
0V
0V
0VP
Electromagnetic clutch
0V
19
26
25
18
27
132
127
131
128
3 7 1 14 12 24
16
17
8
+26V OPEN
DMPH2P
RMONN
PJ
OSC
GATE CIRCUIT
GATE CIRCUIT
BRUNK Q
-
+
-
+
R
S
R Q
S
Vref A Vref B Vs A Vs B Rs A Rs B LG A PG LG B
To Out3, 4Logic
Signal of
DECACY
120
°
C 140
°
C
Operation at normal speed: T0 to T3 = 0.781 ms
DMON-P
DMPH1-P
DMPH2-P
T0 T1 T2 T3
Rotation
Forward rotation Reverse rotation Stop