UX-4000MU
FO-2950MU/C
3) Unit control
a. Main motor drive circuit
This machine uses the 4-phase pulse motor, and is driven by the follow-
ing pulses and the circuit
(Drive waveform)
CNMMT
1
2
3
MA
MA-
MB
MB-
4
MM
OUT1
OUT2
OUT3
OUT4
VBB
24VP
IC2
( Printer PWB)
ENABLE1
14
ENABLE2
7
IN1
13
IN2
8
MA
MB
MEN-
116
137
60
5V
IC5
( Control PWB)
MCA
MCB
MEN-
Stop
Rotation
b. Paper feed controller
Basically, the feed roller is rotated 1.5 times.
If interval between PUS and PIN is within 0.5 sec., it is rotated 1 time.
The procedure of clutch control
1
Timer is cleared by PUS ON according to clutch control demand.
2
PUS OFF 100 ms after PUS ON
3
PUS ON again 450 ms after the procedure
1
above.
4
If paper is remained in PIN 500 ms after the procedure
1
, the third
PUS ON is stopped.
5
PUS OFF 1.25s after the procedure
1
. Clutch control demand OFF
if additional control is cancelled.
6
PUS ON again 1.534s after the procedure
1
.
7
PUS OFF 2.334s after the procedure
1
.
8
Clutch control demand OFF 3.366s after the procedure
1
.
If the paper is not fed normally and the paper in detector signal (PIN_) is
not outputted even with the above operation, the PCU judges it as a
paper jam display is made.
The paper in detector signal (PIN_) is used for the top margin control
signal in addition to jam detection.
The diagram below shows timings of clutch operation.
0.5
1.25 1.534 2.334
3.366
0.991
PUS
PIN
0.1
0.8
0.45
0.5
1.534
0.8
c. Electrical connection
In the paper feed and transportation system, drive parts and sensors
are connected as shown in the figure below.
137
MB
60
MEN-
CPU
(SH7041)
CONTROL PWB
PRINTER PWB
116
MA
+24V
MA
1
CNMMT
+5V
+5V
MA-
2
MB
3
MB-
4
8
7,14
13
4
17
1
2
+24V
1
PUS-
2
IC1
CNPL
130
PUS
ASIC
(LR38784)
4
13
142 PIN-
3
PI2
4
1
2
143 POUT-
3
PI1
4
1
2
PE
9
PE
CNPRT
CNLSU
PD601
PE
9
CN601
+24V
LSU PWB
132
IC2
Motor
driver
PAPER IN
SENSOR
PAPER OUT
SENSOR
MAIN MOTOR
PAPER
PICK-UP SOLENOID
PAPER
EMPTY
SENSOR
• The main motor, which is the drive source for the paper feed and trans-
portation system, is a 4-phase stepping motor in 2-phase excitement
bipolar system, The step angle is 7.5
°
.
• The pick-up solenoid operates on 24V to turn on/off paper feed.
• There are following kinds of sensors.
Paper empty sensor (Transmission photo transistor) :
The paper empty sensor is positioned on the LSU PWB, and is used to
detect presence of paper on the multi-purpose paper tray.
Paper in sensor: (Transmission photo transistor):
This sensor is used to detect the paper feed timing of the next paper
(in prefeed) and to make synchronization between paper transport and
image forming on the drum. This sensor is also used to detect paper
jams.
Paper out sensor: (Transmission photo transistor):
This sensor senses paper exit, and paper jam.
Fig. 5
Fig. 6
Fig. 7
5 – 10
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