Sharp AR-LC1 (serv.man2) Service Manual ▷ View online
Sensor, detector location
No.
Symbol
Name
Function and operation
1
LPFD
Transport detector
Detecting paper discharge
2
LLSW
Upper limit lock switch
Detecting tray upper limit lock (Shutting off motor as a safety device.)
3
LPED
Paper detector
Detecting the presence of paper
4
LUD
Upper limit detector
Detecting tray upper limit position
5
LRES
Encoder sensor
Controlling lifting up
6
LDD
Lower limit detector
Detecting tray lower limit position
7
LTOD
Copier connection detector
Detecting connection to copier
1 LPFD
7 LTOD
5 LRES
6 LDD
2 LLSW
4 LUD
3 LPED
4 – 3
[5] OPERATING PRINCIPLE
1. Lift-up operation
When the copier is powered up, the main circuit checks the detection
state of each sensor. If the upper limit detector (LUD) is OFF, the
lift-up motor is turned on to elevate the tray till the position which
allows paper feed (upper limit detector ON).
state of each sensor. If the upper limit detector (LUD) is OFF, the
lift-up motor is turned on to elevate the tray till the position which
allows paper feed (upper limit detector ON).
1
Upper limit detector (LUD)
2
Paper detector (LPED)
3
Paper tray
4
Lower limit detector (LDD)
2. Lift-down operation
If no paper is present after paper feed, the main circuit detects the
ON condition of the paper detector (LPED) and turns on the lift-up
motor to descend the tray till the position at which the lower limit
detector (LDD) turns on (the tray can be drawn out).
ON condition of the paper detector (LPED) and turns on the lift-up
motor to descend the tray till the position at which the lower limit
detector (LDD) turns on (the tray can be drawn out).
The tray switch PWB indication LED blinks while the tray is lifting or
descending.
descending.
3. Paper feeding
When copying is started, the transport motor (LPFM) starts. Then, the
pick-up solenoid (LPFS) and paper feed clutch (LPFC) turn on. When
the solenoid is turned on, the paper hitching roller is lowered to
contact the paper.
pick-up solenoid (LPFS) and paper feed clutch (LPFC) turn on. When
the solenoid is turned on, the paper hitching roller is lowered to
contact the paper.
When the clutch is turned on, both the paper feed roller and the
hitching roller rotate to start paper feeding. The paper is sent through
the transport sensor (D) to the copier.
hitching roller rotate to start paper feeding. The paper is sent through
the transport sensor (D) to the copier.
1
Paper feed roller clutch (LPFC)
2
Paper hitching roller
3
Paper feed roller
4
Pick-up solenoid (LPFS)
1,2
3
4
LLMD
LLMU
LDD
LUD
5msec
30msec
Lifting (no paper, lifting from bottom to top)
Elevation starts
Reversion starts
About 100 msec
LLMD
LLMU
LDD
LUD
100msec
30msec
Lifting (no paper, descending from top to bottom)
Descending starts
1
2
4
3
4
2
3
LPFM
LPFC
LPFS
LPFD
Paper feed (Letter size, A4, B5)
Job start signal reception
Paper feed start signal reception
Paper feed finish
signal transmission
signal transmission
Job END signal
reception
reception
5 – 1
[6] DISASSEMBLY AND ASSEMBLY
1. Transport section (Paper feed roller)
2. Paper feed section
A. Paper feed unit
1)
2)
1)
1)
2)
2)
3)
4)
6)
5)
5)
7)
1)
1)
2)
1)
2)
3)
2)
2)
6 – 1
B. Paper feed roller, take-up roller
Note 1: When installing the paper feed roller, be careful of the install-
ing direction. …
*
1
Note 2: When installing the paper feed clutch, check that the clutch
stopper is caught by the pawl. …
*
2
C. Reverse roller
3. Control PWB
1)
2)
3)
4)
5)
6)
6)
2
1
rib
1)
2)
3)
1)
2)
6 – 2
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