Sharp AR-LC8 Service Manual ▷ View online
AR-LC8 INTERNAL CONSTRUCTION 4 - 1
[4] INTERNAL CONSTRUCTION
1. Motor, clutch, solenoid
No.
Parts
MODEL
NOTE
Code
Signal name
Name
Type
Function/Operation
Active condition
1
LTM
LTM
Transport
motor
motor
Drives the paper feed, and
the paper transport section.
the paper transport section.
When paper feed is started,
"H" level.
"H" level.
2
LLM
LLM
Lift motor
Synchronous
motor
motor
Lifts the paper feed table.
When the lower limit sensor
is ON, "H" level. When the
upper limit sensor is ON,
"L" level.
is ON, "H" level. When the
upper limit sensor is ON,
"L" level.
3
LTCL
LTCL
Transport
clutch
clutch
Controls ON/OFF of the
transport roller.
transport roller.
4
LPFCL
LPFCL
Paper feed
clutch
clutch
Controls ON/OFF of the
paper feed roller.
paper feed roller.
When paper feed is started,
"H" level. After starring
transport (pickup OFF), it is
turned OFF by the timer.
"H" level. After starring
transport (pickup OFF), it is
turned OFF by the timer.
5
LPSL
LPSL
Paper feed
solenoid
solenoid
Presses the paper pickup
roller onto paper.
roller onto paper.
Turned OFF after starting
transport. Turned ON by
the timer.
transport. Turned ON by
the timer.
∗
Lift-up – When paper
empty detection is made:
ON
empty detection is made:
ON
6
LTLSL
LTLSL
Tray lock
solenoid
solenoid
The tray is locked so that
the tray cannot be pulled
out during paper feed.
the tray cannot be pulled
out during paper feed.
When paper feed is started,
"H" level.
"H" level.
3
5
4
1
2
6
AR-LC8 INTERNAL CONSTRUCTION 4 - 2
2. PWB, sensor
No.
Parts
MODEL
NOTE
Code
Signal name
Name
Type
Function/Operation
Active condition
7
MAIN PWB
—
LCC main
PWB
PWB
Controls and drives the
LCC.
LCC.
8
LLD
LLD
Lower limit
sensor
sensor
The lower limit of the tray is
detected.
detected.
When lifting up, "L" level.
9
LRE
LRE
Lift motor
encoder
encoder
The lift motor rotation is
detected.
detected.
Pulse signal
10 LCD
LCD
Cassette
detection
detection
The tray insertion is
detected.
detected.
11 LTOD
LTOD
The main unit
connection
sensor
connection
sensor
Detects connection to the
main unit.
main unit.
12 LTD
LTD
Transport
sensor
sensor
Detects paper transport.
When paper feed is
performed, when the paper
feed solenoid is "L," it is "H"
level.
performed, when the paper
feed solenoid is "L," it is "H"
level.
13 LUD
LUD
Upper limit
sensor
sensor
Detects the paper upper
limit position.
limit position.
When "H" level (ON), the
lift-up motor stops.
lift-up motor stops.
14 LPED
LPED
Paper
presence/
empty sensor
presence/
empty sensor
Detects paper presence/
empty on the paper tray.
empty on the paper tray.
When paper is detected,
"H."
"H."
∗
When lifting up, if "L" with
LRE 800 pulse, the paper
feed solenoid is ON.
LRE 800 pulse, the paper
feed solenoid is ON.
15 LLSW
LLSW
Upper limit
switch
switch
Protects the paper feed unit
from breakage due to lifting
the tray too much.
from breakage due to lifting
the tray too much.
16 LOSW
LOSW
Upper open/
close switch
close switch
Detects open/close of the
upper door.
upper door.
7
8
9
10
11
14
12
13
15
16
AR-LC8 OPERATIONAL DESCRIPTIONS 5 - 1
[5] OPERATIONAL DESCRIPTIONS
1. Lift operation
When the main unit is turned ON, if the tray is at the lower limit
position (lower limit sensor: LLD ON position), the lift motor is
turned ON to lift the tray.
position (lower limit sensor: LLD ON position), the lift motor is
turned ON to lift the tray.
When the paper presence/empty sensor (LPED) is turned ON
within 800 pulses of the encoder signal from start of lifting up the
tray, the lift motor is turned OFF to stop the tray, and the paper
feed solenoid is turned ON to mode down the pickup roller. After
that, the lift motor is turned ON to lift the tray. The tray is stopped
when the upper limit sensor (LUD) is turned ON.
within 800 pulses of the encoder signal from start of lifting up the
tray, the lift motor is turned OFF to stop the tray, and the paper
feed solenoid is turned ON to mode down the pickup roller. After
that, the lift motor is turned ON to lift the tray. The tray is stopped
when the upper limit sensor (LUD) is turned ON.
If the paper presence/empty sensor (LPED) is not turned on within
800 pulses, the paper feed solenoid is turned ON with the lift
motor ON to move down the pickup roller. Then, the lift motor is
turned ON again to lift the tray. The lift motor is stopped at the
upper limit sensor (LUD) ON position, and the paper feed solenoid
is turned OFF.
800 pulses, the paper feed solenoid is turned ON with the lift
motor ON to move down the pickup roller. Then, the lift motor is
turned ON again to lift the tray. The lift motor is stopped at the
upper limit sensor (LUD) ON position, and the paper feed solenoid
is turned OFF.
When the machine power is turned on, if the tray is on the paper
feed position, lifting is not performed.
feed position, lifting is not performed.
When the tray is pulled out, it moves down by its own weight.
Lifting up operation (When LPED is turned ON within 800
pulses of encoder.)
pulses of encoder.)
Lifting up operation (When LPED is not turned ON within 800
pulses of encoder.)
pulses of encoder.)
2. 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.
sensor: LUD ON position) and there is paper on the tray, paper
feed operation can be performed.
Paper feed operation is performed by the transport motor (LTM),
the transport clutch (LTCL), the paper feed clutch (LPFCL), and
the paper feed solenoid (LPSL) at the following timing.
the transport clutch (LTCL), the paper feed clutch (LPFCL), and
the paper feed solenoid (LPSL) at the following timing.
When the transport clutch (LTRC) is turned ON with the transport
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.
During paper feed operation, the tray lock solenoid (LTLSL) is
turned ON to inhibit pulling out the tray.
turned ON to inhibit pulling out the tray.
LCC paper feed time chart
LLM
(Lift motor output)
LLD
(Lower limit sensor)
LUD
(Upper limit sensor)
LPED
(Paper empty detection)
LPSL
(Solenoid)
Within 800 pulses
200 msec
LRE
(Encoder signal)
LLM
(Lift motor output)
LLD
(Lower limit sensor)
LUD
(Upper limit sensor)
LPED
(Paper empty detection)
LPSL
(Solenoid)
LRE
(Encoder signal)
Within 800 pulses
LTM
(Transport motor)
LTD
(Transport sensor)
LTLSL
(Tray lock solenoid)
TRC
(Main unit
synchronous signal)
LTCL
(Transport clutch)
LPFCL
(Paper feed clutch)
LPSL
(Paper feed solenoid)
Paper feed start
Clearance-between-
papers control timer
PIC drop timer
PIC drop timer
PIC drop timer
PIC drop timer
Clearance-between-
papers control timer
Clearance-between-
papers control timer
Clearance-between-
papers control timer
Resist stop
Resist stop
Resist stop
Paper feed clutch
OFF timer
Paper feed clutch
OFF timer
Paper feed clutch
OFF timer
Paper feed clutch
OFF timer
Paper feed clutch
OFF timer
Preliminary
paper feed start
First sheet
Preliminary
paper feed start
Second sheet
Preliminary
paper feed start
Third sheet
Preliminary
paper feed start
Fourth sheet
Preliminary
paper feed start
Fifth sheet
Preliminary paper
feed complete
Paper feed start
feed complete
Paper feed start
Preliminary paper
feed complete
Paper feed start
feed complete
Paper feed start
Preliminary paper
feed complete
Paper feed start
feed complete
Paper feed start
Preliminary paper
feed complete
feed complete
Preliminary paper
feed complete
feed complete
AR-LC8 OPERATIONAL DESCRIPTIONS 5 - 2
3. 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).
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 feeding is stopped.
3
4
5
1
2
6
7
7
8
1
Paper feed roller clutch
2
Take-up roller
3
Paper feed roller
4
Paper feed solenoid
5
Transport clutch
6
Transport motor
7
Tray lock solenoid
8
Lift-up motor
Click on the first or last page to see other AR-LC8 service manuals if exist.