Sharp AR-5132 Service Manual page 23

5
The manual paper feed solenoid is turned on for 0.08 sec in
synchronization with rotation of the resist roller, and the manual
peper feed roller is rotated. Therefore, paper jams due to insuffi-
cient pick-up of the resist roller is prevented.
At that time, the manual paper feed pick-up roller remains up.
Manual paper feed pick-up roller
Manual paper feed stopper
Transfer paper
Manual paper feed
clutch sleeve
A
B
ON
Manual paper
feed latch
6
The manual paper feed solenoid is turned off and the clutch
sleeve pawl A is caught by the manual paper feed latch and the
mamual paper feed is completed.
Manual paper feed clutch sleeve
A B
OFF
Manual paper
feed latch
MM\
Main motor
PPD1\
Transport sensor 1
PPD2\
Transport sensor 2 "À'— 'm Z " T2
TRCL\
Transport clutch (low speed)
"À'— N b `('á'¬)
TRCH\
Transport clutch (high speed)
"À'— N b `( '¬)
MPFS\
Manual paper
feed solenoid
RRC\
Resist roller clutch
Manual paper feed timing chart
(2) Cassette paper feed section operations
The cassette paper feed operations are the same in the paper tray 1
and the paper tray 2.
The following descriptions are based on the paper tray 1.
Resist roller
Manual paper feed roller
Manual paper feed clutch sleeve A
Manual paper feed latch A
Manual paper feed solenoid
Manual paper feed clutch sleeve A
Manual paper
feed latch A
Manual paper
feed solenoid
1sec
1
Lift up
When the power is turned on, the main circuit checks the sensors.
The lift up motor is turned on/off to make ready for paper feed
according to the states of the paper empty sensor (PED) and the
lift-up senosr (LUD).
Power ON
PED/LUD
LUM ON
CPF2 turns ON, the pick-up roller presses
the copy paper to start paper feed.
2
Paper feed
When the start button is pressed, the cassette paper feed
solenoid (CPFS2) and the cassette paper feed roller clutch
(CPFC2) are turned on. By turning on the solenoid, the paper feed
pick-up roller is pressed down to press the paper.
By turning on the clutch, the paper feed roller and the pick-up
roller start the paper feed operation.
The fed paper is passed through the paper entry sensor (PID) to
the transport roller.
the transport roller is rotated by two drive clutches. For transport
from the paper feed section to the resist roller, It is driven by the
high speed clutch. The resisted paper is transported to the
process section in synchronization with the optical system. The
transport speed at that time is switched from the high speed clutch
to the low speed clutch so that the transport speed becomes the
same as the process rotating speed.
MM\
Main motor
PPD1
Transport sensor 1
PPD2
Transport sensor 2
TRCL\
Transport clutch (low speed)
TRCH\
(high
Transport clutch
speed)
RRC\
Resist roller clutch
LCPFS\
Lower cassette
transport solenoid
LCPFC\
Lower cassette
transport clutch
Lower cassette paper feed timing chart
4 – 3
YES
"ON"
NO