DOWNLOAD Sharp AL-2021 Service Manual ↓ Size: 12.48 MB | Pages: 120 in PDF or view online for FREE

Model
AL-2021
Pages
120
Size
12.48 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Service Manual
File
al-2021.pdf
Date

Sharp AL-2021 Service Manual ▷ View online

AL-2041  OPERATIONAL DESCRIPTIONS  7 - 5
(1)
Cassette paper feed operation
1) The figure below shows the positions of the pick-up roller, the
paper feed clutch sleeve, and the paper feed latch in the initial
state without pressing the Start key after lighting the ready
lamp.
The paper feed latch is in contact with the projection of the
clutch sleeve.
2) When the Start key is pressed, the main drive motor starts
rotating to drive each drive gear.
The pick-up drive gear also is driven at that time. Since, how-
ever, the paper feed latch is in contact with the projection of the
clutch sleeve, rotation of the drive gear is not transmitted to the
pick-up roller, which does not rotate therefore.
3) After about 0.1 sec from when the main motor start rotating, the
tray paper feed solenoid (PFS) turns on for a moment.
This disengages the paper feed latch from the projection of the
clutch sleeve, transmitting rotation of the pick-up drive gear to
the paper feed roller shaft, rotating the pick-up roller to feed the
paper.
4) After more than half rotation of the pick-up roller, the paper feed
latch is brought in contact with a notch on the clutch sleeve,
stopping rotation of the pick-up roller.
5) At this time, the paper is fed passed the paper entry detection
switch (PPD1), and detected by it. After about 0.15 sec from
detection of paper by PPD1, the tray paper feed solenoid (PFS)
turns on so that the clutch sleeve projection comes into contact
with the paper feed latch to stop the pick-up roller. Then the
pick-up roller rotates for about 0.15 sec so that the lead edge of
the paper is evenly pressed on the resist roller, preventing
against skew feeding.
6) To release the resist roller, the tray paper feed solenoid and the
resist solenoid are turned on by the paper start signal to disen-
gage the resist start latch from the clutch sleeve, transmitting
rotation of the resist drive gear to the resist roller shaft. Thus
the paper is transported by the resist roller.
7) After the resist roller starts rotating, the paper is passed through
the pre-transfer guide to the transfer section. Images are trans-
ferred on the paper, which is separated from the OPC drum by
the drum curve and the separation section.
8) The paper separated from the drum is passed through the fus-
ing paper guide, the heat roller (fusing section), POD (paper out
detector) to the copy tray.
OFF
PFS
OFF
RRS
OFF
PFS
OFF
RRS
ON
PFS
OFF
RRS
OFF
PFS
ON
RRS
AL-2041  OPERATIONAL DESCRIPTIONS  7 - 6
(2)
Manual multi paper feed operation
1) Before paper feed operation, the manual paper feed solenoid
(MPFS) is turned OFF as shown in the figure below.
2) When the Start key is pressed, the manual paper feed solenoid
(MPFS) turns on to disengage the manual paper feed latch.
A from the manual paper feed clutch sleeve A, rotating the
manual paper feed roller and the manual take-up roller. At the
same time, the manual paper feed stopper opens and the man-
ual take-up roller is pressed to the surface of the paper to start
paper feeding.
3) When pawl C of the manual paper feed clutch sleeve is
engaged with the manual feed latch, the manual feed stopper
falls and the manual take-up roller rises. At that time, the man-
ual paper feed roller is rotating.
4) The lead edge of the transported paper is pressed on the resist
roller by the transport roller. Then the paper is stopped tempo-
rarily to allow synchronization with the lead edge of the image
on the OPC drum.
From this point, the operation is the same as the paper feed
operation from the tray. (Refer to 7-5 - 8.)
5) The solenoid turns off to close the gate and return to the initial
state.
OF
MPFS
F
C
A
ON
MPFS
A
C
ON
MPFS
A
C
OF
MPFS
F
A
C
AL-2041  OPERATIONAL DESCRIPTIONS  7 - 7
(3)
Conditions of occurrence of paper misfeed
a. When the power is turned on:
PPD or POD is ON when the power is turned on.
b. Copy operation
6. Process unit new drum detection 
mechanism
1) When the power is turned on, the detection gear 38T is rotated
in the arrow direction by the detection gear 20T to push the
micro-switch (process detection switch) installed to the machine
sensor cover, making a judgement as a new drum.
2) When the detection gear 38T turns one rotation, there is no
gear any more and it stops.
The latch section of the 38T gear is latched and fixed with the
projection of the process cover.
a
PPD1 jam
PPD1 does not turn off within 4 sec after 
turning on the resist roller.
b
PPD2 jam
PPD2 is off immediately after turning on the 
resist roller.
PPD2 does not turn off within 1.2 sec after 
turning off the resist roller.
c
POD jam 
POD does not turn on within 2.9 sec after 
turning on the resist roller.
POD does not turn off within 1.5 sec - 2.7 sec 
after turning off PPD2.
Gear 20T
Process detection switch
Gear 38T
Gear notch
Gear pawl
Projection
Gear notch
Gear pawl
Projection
AL-2041  OPERATIONAL DESCRIPTIONS  7 - 8
7. SPF section
A. Outline
The SPF (Single Path Feeder) is installed to the AL-2031/2041 as a
standard provision.
It automatically copies up to 50 sheets of documents of a same
size. (Only one set of copies)
B. Document transport path and basic 
composition
AL-2031/2041
C. Operational descriptions
AL-2031/2041
SPF JAM generation condition
1) When SPPD is ON (document remaining) in initializing
2) When SPPD is not turned ON within about 1.5 sec (at 100%
copy) after starting the document feed operation.
3) When SPPD is not turned OFF within about 4.7 sec (at 100%
copy) after turning on SPPD.
4) When the OC cover is opened during document transport (dur-
ing SPF motor rotation) (The SPF motor is stopped during doc-
ument transport, but the OC cover open error occurs instead of
the SPF JAM.)
1
Pickup roller
2
Sheet of document for paper feed
3
Set detection ACT
4
Document feed roller
5
Separation sheet
6
Paper entry sensor
7
PS roller D
8
Transport follower roller
9
Paper exit roller
10
Paper exit follower roller
11
Document tray
11
1
9
3 4
5
2
10
6
7
8
SPID ON
PSW ON
MRMT rotation
MM rotation
CPFS ON
SPFM rotation
Document set
Document set sensor
Document feed unit lamp ON
PPD ON
RRC ON
SPPD ON
POD ON
Copy start
The scanner is shifted
to the exposure position.
(Copier side)
Main motor rotation
Paper feed
Synchronization
(Transfer)
(Fusing)
(Document exit)
Paper transport
(Exposure)
In the zooming mode, the magnification ratio in the sub 
scanning direction (paper transport direction) is adjusted
by changing the document transport speed.
(Paper exit)
SPF motor rotation
Document transport sensor
Document transport
(SPF side)
PSW
MRMT
SPF M
CL
SPPD
260ms
182ms
SCANST
MAIN M
CPFS1
RRS
PPD1
PPD2
POD
Page of 120
Display

Click on the first or last page to see other AL-2021 service manuals if exist.