Sharp MX-LC16 Service Manual ▷ View online
MX-LC16 MAINTENANCE 3 – 7
4)
Remove the clutch unit, E-ring and clutch.
MX-LC16 OPERATIONAL DESCRIPTIONS 4 – 1
MX-LC16
Service Manual
[4] OPERATIONAL DESCRIPTIONS
1. Electrical and mechanical main parts
Signal
name
Name
Type
Function/operation
DOWN
SW PWB
SW PWB
Lowering SW PWB unit
Transmission type
The tray state is displayed with LED.
LCSW
Tray close detection switch
Micro switch
The tray insertion is detected.
LDD
Lower limit detector
Transmission type
The lower limit of the tray is detected.
LDSW
Upper open/close switch
Micro switch
Detects open/close of the upper door.
LFAN
Separation assist fan
Assist feeding of paper
LLM
Lift motor
Brush motor
Lifts or lowers the paper feed table.
LLSW
Upper limit switch
Micro switch
Protects the paper feed unit from breakage due to lifting the tray too much.
LPED
Paper empty detector
Reflection type
Detects paper presence/empty on the paper tray.
LPFC
Paper feed clutch
Electromagnetic clutch
Controls ON/OFF of the paper feed roller.
LPFD
Paper pass detector
Reflection type
Detects paper transport.
LPFM
Paper feed motor
Brushless motor
Drives the paper feed, and the paper transport section.
LPFS
Paper feed solenoid
Electromagnetic solenoid
Presses the paper pickup roller onto paper.
LPUD
Paper upper surface sensor
Reflection type
Detects paper surface position
LRE
Lift motor rotaly encoder sensor
Transmission type
The lift motor rotation is detected.
LTLD
Tray lock sensor
Electromagnetic solenoid
Detects the tray lock
LTLS
Tray lock solenoid
Electromagnetic solenoid
Controls ON/OFF of the tray lock
LTOD
The main unit connection sensor
Transmission type
Detects connection to the main unit
LTRC
Transport clutch
Electromagnetic clutch
Controls ON/OFF of the transport roller.
LUD
Upper limit sensor
Transmission type
Detects the paper upper limit position.
LWRSW
Reverse winding detection switch
Micro switch
Detects lift motor reverse winding
No.
Name
Function/operation
1
Paper pickup roller
Feeds paper to the paper feed roller.
2
Paper feed roller
Feeds paper to the paper transport section.
3
Transport roller (Drive)
Transports paper from the paper feed roller to the main unit.
4
Transport roller (Idle)
Applies a pressure to paper and the transport roller to provide a transport power of the transport roller to
paper.
paper.
5
Separation roller
Separates paper to prevent double feed.
DOWN SW PWB
LWRSW
LRE
LCSW
LDD
LTLD
LPFD
LTOD
LDSW
LLSW
LUD
LPED
LPUD
LFAN
LFAN
LPFM
LTRC
LPFC
LPFS
LLM
LTLS
MX-LC16 OPERATIONAL DESCRIPTIONS 4 – 2
2. Lift Operation
A. Lifting by insertion of the tray
When insertion of the tray is detected. the tray is locked by the tray
lock solenoid so that the tray cannot be pulled out. when tray lock is
set by turning ON the tray lock sensor (LTLD). the lift motor is
turned ON to lift the tray. when the tray is lifted the tray LED blinks
and stops at the paper feed position (upper limit) by turned ON the
upper limit sensor (LUD). when the tray stops at the paper feed
position (upper limit) the tray LED turns on.
lock solenoid so that the tray cannot be pulled out. when tray lock is
set by turning ON the tray lock sensor (LTLD). the lift motor is
turned ON to lift the tray. when the tray is lifted the tray LED blinks
and stops at the paper feed position (upper limit) by turned ON the
upper limit sensor (LUD). when the tray stops at the paper feed
position (upper limit) the tray LED turns on.
When the paper empty detector (LPED) turns ON within 1097
pulses of the encoder signal from start of the tray lifting, the lift
motor is turned OFF to stop the tray.and the paper feed solenoid
(LPFS) is turned ON to lower the pick roller. after that the lift motor
is turned ON again to lift the tray and stop it at the upper limit sen-
sor (LUD) ON position.
pulses of the encoder signal from start of the tray lifting, the lift
motor is turned OFF to stop the tray.and the paper feed solenoid
(LPFS) is turned ON to lower the pick roller. after that the lift motor
is turned ON again to lift the tray and stop it at the upper limit sen-
sor (LUD) ON position.
When the paper empty detector (LPED) does not turn ON within
1097 pulses the paper feed solenoid (LPFS) is turned ON with the
lift motor ON to lower the pick roller. the lift motor is stopped at the
upper limit sensor (LUD) ON position and the paper feed solenoid
is turned OFF
1097 pulses the paper feed solenoid (LPFS) is turned ON with the
lift motor ON to lower the pick roller. the lift motor is stopped at the
upper limit sensor (LUD) ON position and 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.
Lifting (when LPED turns ON within 1097 pulses during lifting)
Lifting (When LPED does not turn ON within 1097 pulses
during lifting)
during lifting)
B. Lowering operation by paper empty detection
or pressing the tray SW
When the paper empty detector (LPED) turns OFF with the tray at
the paper feed position (upper limit) or when the tray SW (LTLS) is
pressed the tray is lowered by 542 pulses of the encoder signal and
stopped at the paper supply position. when the lower limit detector
(LDD) turns ON before lowering the tray by 542 pulses of the
encoder signal the lift motor is turned OFF to stop the tray.
the paper feed position (upper limit) or when the tray SW (LTLS) is
pressed the tray is lowered by 542 pulses of the encoder signal and
stopped at the paper supply position. when the lower limit detector
(LDD) turns ON before lowering the tray by 542 pulses of the
encoder signal the lift motor is turned OFF to stop the tray.
When the tray is moving down the tray LED blinks. when the tray is
stopped at the paper supply position the tray LED turns OFF.when
the tray is stopped at the paper supply position the tray lock sole-
noid release the lock so that the tray can be pulled out. when the
tray is lowered with the paper empty detector (LPED) OFF the tray
remains at the paper supply position and the tray lock is released.
stopped at the paper supply position the tray LED turns OFF.when
the tray is stopped at the paper supply position the tray lock sole-
noid release the lock so that the tray can be pulled out. when the
tray is lowered with the paper empty detector (LPED) OFF the tray
remains at the paper supply position and the tray lock is released.
When the tray is lowered by pressing the tray SW (LTLS) if the tray
is not pulled out from the paper supply position for 90sec the tray
lock solenoid locks the tray when the tray is locked securely the lift
motor is turns ON to lift the tray. when the tray is lifting the tray LED
blinks when the upper limit sensor (LUD) is turned ON the tray
stops at the paper feed position (upper limit). when the tray stops at
the paper feed position (upper limit) the tray LED turns ON.
is not pulled out from the paper supply position for 90sec the tray
lock solenoid locks the tray when the tray is locked securely the lift
motor is turns ON to lift the tray. when the tray is lifting the tray LED
blinks when the upper limit sensor (LUD) is turned ON the tray
stops at the paper feed position (upper limit). when the tray stops at
the paper feed position (upper limit) the tray LED turns ON.
Lowering operation (when paper empty is detected)
Lowering operation (when tray SW is pressed)
LLM
(Lift motor output)
LDD
(Lower limit sensor)
LUD
(Upper limit sensor)
LPED
(Paper empty detector)
LPFS
(Solenoid)
Within 1097 pulses
LRE
(Encoder signal)
200msec
LLM
(Lift motor output)
LDD
(Lower limit sensor)
LUD
(Upper limit sensor)
LPED
(Paper empty detector)
LPFS
(Solenoid)
LRE
(Encoder signal)
1097
LLM
(Lift motor output)
LDD
(Lower limit detector)
LUD
(Upper limit sensor)
LPED
(Paper empty detector)
LTLS
(Tray SW)
LRE
(Encoder signal)
542
LLM
(Lift motor output)
LDD
(Lower limit detector)
LUD
(Upper limit sensor)
LPED
(Paper empty detector)
LTLS
(Tray SW)
LRE
(Encoder signal)
Less than 542
MX-LC16 OPERATIONAL DESCRIPTIONS 4 – 3
C. Lowering operation by paper supply
If the tray is pulled out when it is at the paper supply position the
tray lock solenoid keeps the lock open. when the tray is pulled out
the tray LED turns OFF. when the paper upper surface sensor
(LPUD) is turned ON for 2sec while the tray is pulled out the lift
motor is turned ON to lower the tray.
tray lock solenoid keeps the lock open. when the tray is pulled out
the tray LED turns OFF. when the paper upper surface sensor
(LPUD) is turned ON for 2sec while the tray is pulled out the lift
motor is turned ON to lower the tray.
When the paper upper surface sensor (LPUD) is turned OFF while
the tray is lowered the lift motor is turned OFF to stop the tray.
when the lower limit detector (LDD) is turned ON while the tray is
lower the lift motor is turned OFF to stop the tray regardless of the
state of the paper upper surface sensor (LPUD)
the tray is lowered the lift motor is turned OFF to stop the tray.
when the lower limit detector (LDD) is turned ON while the tray is
lower the lift motor is turned OFF to stop the tray regardless of the
state of the paper upper surface sensor (LPUD)
Lowering operation (when paper is supplied or when the paper
front surface sensor is turned ON)
front surface sensor is turned ON)
Lowering operation (when paper is supplied or when the lower
limit sensor is turned ON)
limit sensor is turned ON)
3. Paper Feed Operation
When the tray is stationary at the paper feed position (upper limit
sensor (LUD) on position and there is paper on the tray paper feed
operation can be performed. paper feed operation is performed by
the paper feed motor (LPFM) the transport clutch (LTRC) the paper
feed clutch (LPFC) and the paper feed solenoid (LPFS) at the fol-
lowing timing.
sensor (LUD) on position and there is paper on the tray paper feed
operation can be performed. paper feed operation is performed by
the paper feed motor (LPFM) the transport clutch (LTRC) the paper
feed clutch (LPFC) and the paper feed solenoid (LPFS) at the fol-
lowing timing.
When the transport clutch (LTRC) is turned ON with the paper feed
motor (LPFM) ON rotating the transport roller rotates when the
paper feed clutch (LPFC) is turned on under this state the paper
feed roller and the take-up roller rotate when the paper feed sole-
noid (LPFS) is turned ON the take-up roller is pushed down to
press paper.
motor (LPFM) ON rotating the transport roller rotates when the
paper feed clutch (LPFC) is turned on under this state the paper
feed roller and the take-up roller rotate when the paper feed sole-
noid (LPFS) is turned ON the take-up roller is pushed down to
press paper.
Paper feed time chart
4. Paper empty detection
When the tray lifts and stops at the paper feed position and during
paper feed operation, paper presence/empty is detected by the
paper presence/empty sensor (LPED). when paper empty is
detected in the tray during paper feeding, paper feeding is stopped.
paper feed operation, paper presence/empty is detected by the
paper presence/empty sensor (LPED). when paper empty is
detected in the tray during paper feeding, paper feeding is stopped.
LLM
(Lift motor output)
LDD
(Lower limit detector)
LPUD
(Paper upper surface
sensor)
LRE
(Encoder signal)
2 [sec]
LLM
(Lift motor output)
LDD
(Lower limit detector)
LPUD
(Paper upper surface
sensor)
LRE
(Encoder signal)
2 [sec]
1
Paper feed roller clutch
2
Take-up roller
3
Paper feed roller
4
Paper feed solenoid
5
Transport clutch
6
Transport motor
7
Lift-up motor
Resist stop
LPFM
(Paper feed motor)
LPFD
(Paper pass detector)
TRC-LCC
(Main unit
synchronous signal)
LTRC
(Transport clutch)
LPFC
(Paper feed clutch)
LPFS
(Paper feed solenoid)
Paper feed start
Clearance-between-
papers control timer
Clearance-between-
papers control timer
PIC drop timer
PIC drop timer
p
o
ts
ts
is
e
R
Paper feed clutch
OFF timer
Paper feed clutch
OFF timer
Preliminary
paper feed start
First sheet
Preliminary paper
feed complete
Paper feed start
Preliminary
paper feed start
Second sheet
Preliminary paper
feed complete
Paper feed start
Clearance-between-
papers control timer
PIC drop timer
Paper feed clutch
OFF timer
Preliminary
paper feed start
Third sheet
Preliminary paper
feed complete
Paper feed start
1
2
3
4
5
6
7
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