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FO-2970MU
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
24VP
VBB
CNMMT
MA
1
OUT1
MA-
2
OUT2
MM
MB
3
OUT3
MB-
4
OUT4
( Printer PWB)
(Drive waveform)
Stop
Rotation
MCA
MCB
MEN-
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.
1
The procedure of clutch control
2
Timer is cleared by PUS ON according to clutch control demand.
3
PUS OFF 100 ms after PUS ON
4
PUS ON again 450 ms after the procedure
If paper is remained in PIN 500 ms after the procedure
5
PUS ON is stopped.
PUS OFF 1.25s after the procedure
6
if additional control is cancelled.
7
PUS ON again 1.534s after the procedure
8
PUS OFF 2.334s after the procedure
Clutch control demand OFF 3.366s after the procedure
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.
PUS
0.8
0.1
0.45
0.5
PIN
0.5
0.991
1.25 1.534 2.334
5V
IC2
14
ENABLE1
7
ENABLE2
IC5
13
MA
116
IN1
MEN-
60
8
MB
137
IN2
( Control PWB)
Fig. 5
1
1
above.
, the third
1
. Clutch control demand OFF
1
1
.
1
.
.
0.8
1.534
3.366
Fig. 6
c. Electrical connection
In the paper feed and transportation system, drive parts and sensors
are connected as shown in the figure below.
CONTROL PWB
PRINTER PWB
CPU
(SH7041)
116 MA
13
60
MEN-
7,14
137 MB
8
ASIC
130 PUS
(LR38784A)
142 PIN-
3
4
143 POUT-
3
4
132
PE
CNPRT
• 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.
5 – 10
CNMMT
1
1
MA
IC2
17
2
MA-
Motor
4
3
MB
driver
2
4
MB-
MAIN MOTOR
+24V
CNPL
1
+24V
4
IC1
13
2
PUS-
+5V
1
PAPER
PAPER IN
PICK-UP SOLENOID
SENSOR
PI2
2
+5V
1
PAPER OUT
SENSOR
PI1
LSU PWB
2
CN601
CNLSU
9
PE
9
PE
Fig. 7
+24V
PD601
PAPER
EMPTY
SENSOR
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