Read Sharp MX-LC15 Service Manual online
MX-LC15 OPERATIONAL DESCRIPTIONS 4 – 2
2. Lift Operation
When the power to the main unit is turned ON with the tray at a
midway position (that is, a position where both the upper limit sen-
sor (LUD) and tray downer limit detector (LDD) are OFF) or with the
tray at the lower limit position (where the tray downer limit detector
LDD is ON), the main unit issues a lift-up request and, in response,
the lift motor is turned ON to lift the tray.
midway position (that is, a position where both the upper limit sen-
sor (LUD) and tray downer limit detector (LDD) are OFF) or with the
tray at the lower limit position (where the tray downer limit detector
LDD is ON), the main unit issues a lift-up request and, in response,
the lift motor is turned ON to lift the tray.
If the tray paper empty detector (LPED) turns ON within 800
encoder pulses of the start of tray lift, the lift motor is temporarily
turned OFF to stop the tray, and then the paper feed solenoid is
turned ON to lower the pick roller. Subsequently, the lift motor is
turned ON, and the tray is lifted to and stopped at a position where
the upper limit sensor (LUD) is turned ON.
encoder pulses of the start of tray lift, the lift motor is temporarily
turned OFF to stop the tray, and then the paper feed solenoid is
turned ON to lower the pick roller. Subsequently, the lift motor is
turned ON, and the tray is lifted to and stopped at a position where
the upper limit sensor (LUD) is turned ON.
If the tray paper empty detector (LPED) does NOT turn ON within
800 pulses of the start of tray lift, the paper feed solenoid is turned
ON with the lift motor remaining ON, and the pick roller is lowered.
The lift motor stops when the tray reaches a position where the
upper limit sensor (LUD) is turned ON, and subsequently the paper
feed solenoid is turned OFF.
800 pulses of the start of tray lift, the paper feed solenoid is turned
ON with the lift motor remaining ON, and the pick roller is lowered.
The lift motor stops when the tray reaches a position where the
upper limit sensor (LUD) is turned ON, and subsequently the paper
feed solenoid is turned OFF.
Lift operation is not performed if the power to the main unit is turned
ON with the tray at a position where it can feed paper.
ON with the tray at a position where it can feed paper.
When the tray is drawn out, it lowers by its own weight.
Lift operation (where LPED turns ON within 800 encoder
pulses of the start of lift operation)
pulses of the start of lift operation)
Lift operation (where LPED does NOT turn ON within 800
encoder pulses of the start of lift operation)
encoder pulses of the start of lift operation)
3. Paper Feed Operation
Paper feed operation can be performed if the tray is stationary at a
position where it can feed paper (with the upper limit sensor (LUD)
being ON) and there is paper in the tray.
position where it can feed paper (with the upper limit sensor (LUD)
being ON) and there is paper in the tray.
When paper feed takes place, the paper feed motor (LPFM), the
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
transport clutch (LTRC), the paper feed clutch (LPFC), and the
paper feed solenoid (LPFS) operate with the following timings:
When the transport clutch (LTRC) turns ON with the paper feed
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and paper pick up rollers start rotating.
motor (LPFM) is ON (rotating), the transport roller starts rotating.
When the paper feed clutch (LPFC) turns ON in this state, the
paper feed and paper pick up rollers start rotating.
When the paper feed solenoid (LPFS) turns ON, the paper pick up
roller is pushed down to press paper.
roller is pushed down to press paper.
Paper feed time chart
*1: Operation stops only if the main unit synchronization signal is
output.
When operation is stopped, the ON/OFF timing for each load is
delayed by the stoppage time because each timer is suspended
during the stoppage.
output.
When operation is stopped, the ON/OFF timing for each load is
delayed by the stoppage time because each timer is suspended
during the stoppage.
4. Paper empty detection
The tray paper empty detector (LPED) checks whether there is
paper in the tray when the tray is lifted and stopped at a position
where it can feed paper, as well as during paper feed operation.
paper in the tray when the tray is lifted and stopped at a position
where it can feed paper, as well as during paper feed operation.
Paper feed operation is stopped if the sensor detects no paper in
the tray during paper feed operation.
the tray during paper feed operation.
(lift motor output)
(Tray downer limit detector)
(upper limit sensor)
(Tray paper empty detector)
(solenoid)
(Lift motor rotaly encoder sensor)
200 msec
Within 800 pulses
LDD
LLM
LUD
LPED
LPFS
LRE
(lift motor output)
(Tray downer limit detector)
(upper limit sensor)
(Tray paper empty detector)
(solenoid)
(Lift motor rotaly encoder sensor)
LDD
LLM
LUD
LPED
LPFS
LRE
800
1
LCC Paper feed roller clutch
2
Take-up roller
3
Paper feed roller
4
LCC Paper feed solenoid
5
LCC Transport clutch
6
LCC Transport motor
7
LCC Lift-up motor
Start of job
Clearance-between-papers
control timer
Clearance-between-papers
control timer
PIC timer
Paper feed clutch
OFF timer
Start of 1st
paper feed
Start of 2nd
paper feed
Start of 3rd
paper feed
Paper feed clutch
OFF timer
PIC timer
Paper feed speed
LPFM
(paper feed
motor)
LPFD
(paper pass
detector)
LPFC
LTRC
(paper feed
clutch)
(transport
clutch)
TRC
(main unit
synchronization
signal)
LPFS
(paper feed
(paper feed
solenoid)
suspended
on
off
on
off
on
off
on
off
on
off
*1
1
2
3
4
5
6
7
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