Sharp AR-LC6 (serv.man2) Service Manual ▷ View online
: Jan. 9 2004
1
AR-LC6 OPERATIONAL DESCRIPTIONS 4 - 1
[4] 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.
(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 sen-
sor (LUD) is turned ON.
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 sen-
sor (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.
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.
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.)
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 sen-
sor: LUD ON position) and there is paper on the tray, paper feed oper-
ation can be performed.
sor: LUD ON position) and there is paper on the tray, paper feed oper-
ation 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.
transport clutch (LTCL), the paper feed clutch (LPFCL), and the paper
feed solenoid (LPSL) at the following timing.
When the transport clutch (LTCL) is turned ON with the transport motor
(LTM) ON (rotating), the transport roller rotates. When the paper feed
clutch (LPFCL) is turned on under this state, the paper feed roller and
the take-up roller rotate. When the paper feed solenoid (LPSL) is
turned ON, the take-up roller is pushed down to press paper.
(LTM) ON (rotating), the transport roller rotates. When the paper feed
clutch (LPFCL) is turned on under this state, the paper feed roller and
the take-up roller rotate. When the paper feed solenoid (LPSL) is
turned ON, the take-up roller is pushed down to press paper.
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
1
LTM
(Transport motor)
LTD
(Transport sensor)
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
1
: Jan. 9 2004
1
AR-LC6 OPERATIONAL DESCRIPTIONS 4 - 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.
feeding is stopped.
3
4
5
1
2
6
7
1
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
1
AR-LC6 DISASSEMBLY, ASSEMBLY, MAINTENANCE 5 - 1
[5] DISASSEMBLY, ASSEMBLY, MAINTENANCE
1. Maintenance system table
✕
: Checking (clean, replace or adjust as required)
❍
: Cleaning
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Position shift
(Note) Replacement reference: For replacement, refer to each paper feed port counter value.
Paper feed roller related section: 200K or 1 year
Torque limiter: 800K
Torque limiter: 800K
2. Maintenance parts replacement procedures
A. Paper feed roller
1) Pull the lever, and open the upper cover.
2) Remove the screw, and remove the sheet.
3) Remove the pawl, and remove the pickup roller and the paper feed
roller.
4) Remove the screw, and remove the paper guide block.
5) Remove the pawl, and remove the reverse roller.
AR-M550U/M550N
(PM: 250K)
(PM: 250K)
When
calling
250K
500K
750K
1000K
1250K
1500K
1750K
2000K
Remark
AR-M620U/M620N
(PM: 300K)
(PM: 300K)
300K
600K
900K
1200K
1500K
1800K
2100K
2400K
Unit name
No.
Part name
(Note)
Paper feed
separation
section
separation
section
1
Paper pickup roller/
Paper feed rollers
Paper feed rollers
✕
❍
❍
❍
❍
❍
❍
❍
❍
(Note)
2
Torque limiter
✕
✕
✕
✕
✕
✕
✕
✕
✕
Transport
section
section
3
Transport rollers
✕
❍
❍
❍
❍
❍
❍
❍
❍
4
Transport paper guides
❍
❍
❍
❍
❍
❍
❍
❍
❍
Gears (Specified position)
Drive
section
section
5
Gears
✕
✩
✩
✩
✩
✩
✩
✩
✩
6
Belt
✕
✕
✕
✕
✕
✕
✕
✕
Others
7
Sensors
✕
✕
✕
✕
✕
✕
✕
✕
✕
AR-LC6 DISASSEMBLY, ASSEMBLY, MAINTENANCE 5 - 2
3. Each unit removal
A. Paper feed unit
1) Pull out the tray.
2) Open the upper cover, and remove three screws.
3) Remove the upper cabinet.
4) Disconnect the connectors (2 positions).
5) Remove the screw, and remove the paper feed unit.
B. Paper feed tray
1) Pull out the tray.
2) Remove the screws from the left and right rail sections.
3) Remove the tray unit from the rail.
C. Drive unit
1) Remove the screw, and remove the rear cover.
2) Remove the connectors (2 positions).
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