Sharp MX-M850 (serv.man16) Service Manual ▷ View online
MX-M1100 TRAY PAPER FEED SECTION E – 5
2. Operational descriptions
A. Preliminary operation before paper feed
1)
Set paper in the tray, and insert the tray into the machine. The
tray sensor turns on.
tray sensor turns on.
2)
The lift-up motor operations to lift the tray.
3)
The paper upper limit sensor turns on to stop the tray at the
specified position.
specified position.
B. Paper feed operation
1)
When copy/print operation is started, the motors (MM1, MM2)
and the clutch (C1PFC) are turned on to turn on the colenoid
(C1PUS) at the timing of paper pickup. This rotates and falls
the take-up roller to pick up paper.
and the clutch (C1PFC) are turned on to turn on the colenoid
(C1PUS) at the timing of paper pickup. This rotates and falls
the take-up roller to pick up paper.
2)
At the same time, the paper feed roller rotates to feed paper to
the transport section.
At that time, the separation roller rotates to prevent against
double feed of paper.
the transport section.
At that time, the separation roller rotates to prevent against
double feed of paper.
C. Each paper feed tray paper size detection method
Paper feed tray (Paper feed tray 3), multi purpose paper feed tray
(Paper feed tray 4).
1)
(Paper feed tray 4).
1)
Paper width detection
The paper width is calculated with the VR voltage value (A/D
conversion value) linked with the side guide plate.
Paper width and paper size (set in the range of standard value
± 6 mm).
The paper width is calculated with the VR voltage value (A/D
conversion value) linked with the side guide plate.
Paper width and paper size (set in the range of standard value
± 6 mm).
2)
Paper size detection
The paper size detection is made by the combination of the
cassette paper size detector 1 to 4.
The paper size detection is made by the combination of the
cassette paper size detector 1 to 4.
Relationship between paper size and detection by the paper size detector.
3)
Combination of size detection.
Width size
detection
pattern
Paper size
Standard
value
[mm]
Range [mm]
A
A3/A4
297.0
303.0 to 291.0
B
WLT/LT
279.4
285.4 to 273.4
C
B4/B5
257.0
263.0 to 251.0
D
LG/LTR/Foolscap
215.9
221.9 to 209.9
E
A4R
210.0
216.0 to 204.0
F
Exective-R
184.1
190.1 to 178.1
G
B5R
182.0
188.0 to 176.0
CSS2
CSS1
CSS3
CSS4
Vertical size
detection
Pattern
Detection SW state
AB size
Inch size
Width of detection
range
CSS1
CSS2
CSS3
CSS4
1
ON
ON
OFF
ON
B5
Extra
147.0 to 198.0
2
OFF
ON
OFF
ON
A4
LT
198.0 to 237.0
3
OFF
ON
ON
ON
B5R
EX-R
237.0 to 274.0
4
OFF
OFF
ON
ON
A4R
LTR
274.0 to 314.0
5
ON
OFF
ON
ON
Foolscap
Extra
314.0 to 347.0
6
ON
OFF
ON
OFF
B4
LGL
347.0 to 389.0
7
ON
ON
ON
OFF
A3
WLT
389.0 to 432.8
0
OFF
OFF
OFF
OFF
Paper feed tray not attached
Paper size
Width detection
pattern
Vertical detection
pattern
B5
C
1
A4
A
2
B5R
G
3
A4R
E
4
Foolscap
D
5
B4
B
6
A3
A
7
LT
B
2
EX-R
F
3
LTR
D
4
LGL
D
6
WLT
B
7
MX-M1100 TRAY PAPER FEED SECTION E – 6
D. Remaining paper detection
(1) Remaining paper detection
Remaining paper detection is performed according to four stages,
i.e. three stages with paper and one stage with no paper, and the
result is displayed.
i.e. three stages with paper and one stage with no paper, and the
result is displayed.
(2) Detection method
The number of remaining sheets is determined according to the
number of times the remaining paper sensor changes from the time
the paper feed tray starts lifting up to the time when the upper
detection sensor comes ON.
number of times the remaining paper sensor changes from the time
the paper feed tray starts lifting up to the time when the upper
detection sensor comes ON.
E. Outline
The paper transport section serves the function of transferring
paper from each paper feed port to the registration roller section.
Paper from paper feed tray units 1 and 2, paper feed tray 3 and
paper feed tray 4 is transported vertically to the registration roller
section.
The detection of double-feed is done before transferring paper to
the registration roller, and the check of the off-center is carried out
by the image position sensor.
After the leading edge of the paper is synchronized with the leading
edge of the drum image in the registration roller section, the paper
that is transfer printed with the image in the transfer section passes
through the fusing section and is discharged either face-down or
face-up.
paper from each paper feed port to the registration roller section.
Paper from paper feed tray units 1 and 2, paper feed tray 3 and
paper feed tray 4 is transported vertically to the registration roller
section.
The detection of double-feed is done before transferring paper to
the registration roller, and the check of the off-center is carried out
by the image position sensor.
After the leading edge of the paper is synchronized with the leading
edge of the drum image in the registration roller section, the paper
that is transfer printed with the image in the transfer section passes
through the fusing section and is discharged either face-down or
face-up.
The no-paper detection sensor
detects the state of no remaining paper.
detects the state of no remaining paper.
1/3 Field
Sensor logic: Low
Sensor logic: Low
2/3 Field
Sensor logic: Hi
Sensor logic: Hi
3/3 Field
Sensor logic: Low
Sensor logic: Low
During no-paper detection
Remaining paper 1/3 position
Remaining paper 2/3 position
Remaining paper 1/3 position
Turn plate
MCPED
(paper sensor)
(paper sensor)
Remaining Paper
Detection Actuator
Detection Actuator
MCSPD
(remaining paper detection sensor)
(remaining paper detection sensor)
(Figure showing state transition of the remaining paper detection sensor during tray elevation and
changes in status according to the number of remaining sheets)
Double feed
detection
detection
Image position sensor
MX-M1100 TRAY PAPER FEED SECTION E – 7
F. Paper transport operation
Straight-Through Path (No Inversion, No Duplexing)
The paper transported from the each tray section is sent to the
paper exit roller (which is driven by the paper exit motor (POM))
with the transport roller.
paper exit roller (which is driven by the paper exit motor (POM))
with the transport roller.
Paper transport speed
G. Paper face-down output operation
Inversion Path (Face-down Output, No Duplexing)
When face-down print is selected, the paper is passed under the
Face-up/face-down select gate.
After paper passing, the paper exit gate guide falls down by its own
weight.
When the specified time has passed from detection of the paper
lead edge by Face down reverse detection, Paper exit reverse
motor (SBRM) rotates reverse direction in the specified time. (The
rotation time differs depending on the paper size.)
Face-up/face-down select gate.
After paper passing, the paper exit gate guide falls down by its own
weight.
When the specified time has passed from detection of the paper
lead edge by Face down reverse detection, Paper exit reverse
motor (SBRM) rotates reverse direction in the specified time. (The
rotation time differs depending on the paper size.)
3. Disassembly and assembly
A. Tray 3, 4 paper feed unit
(1) Tray 3, 4 paper feed unit
1)
Open the front cover (a).
2)
Remove the waste toner bottle (a).
Unit (mm/s)
110/95CPM
85CPM
: Normal speed
540
400
(Process speed)
: High speed
600
500
(Paper feed and exit speed)
: High speed
1000
1000
(Switchback speed)
1
1
2
Face-up/face-down select gate
1
2
3
Face down reverse detection
2
3
3
1
2
Fase-up/fase-down
select gate solenold
OFF-up, ON-Down
select gate solenold
OFF-up, ON-Down
Unit
Parts
Page
Tray 3, 4 paper feed
Unit
Unit
A
Cassette 3, 4 upper limit
detection
detection
E - 9/a
B
Cassette 3, 4 paper empty
detection
detection
C
Cassette 3, 4 paper entry
detection
detection
D
Cassette 3, 4 pickup solenoid
C
B
A
D
a
a
MX-M1100 TRAY PAPER FEED SECTION E – 8
3)
Remove the right cabinet center.
* The following procedure can be performed without removing
* The following procedure can be performed without removing
the right cabinet center. However, the procedure is easier
when the right lower cabinet is removed.
when the right lower cabinet is removed.
4)
Open the vertical transport door unit (a). Push the lever (b) to
release the lock of the vertical transport door unit (a).
release the lock of the vertical transport door unit (a).
5)
Lift the vertical transport door unit (a) and disengage the ful-
crum (b) on the lower side, and remove the vertical transport
door unit (a).
crum (b) on the lower side, and remove the vertical transport
door unit (a).
6)
Pull out all paper feed tray (a).
7)
Remove the screw (a), and remove the cover (b).
8)
Remove the screw (a), and remove the fulcrum block (b) and
the paper guide (c).
the paper guide (c).
9)
Disconnect the connector (a). Remove the screw (b), and
remove the tray 3, 4 paper feed unit (c).
remove the tray 3, 4 paper feed unit (c).
a
b
b
a
a
a
a
a
b
a
b
c
a
b
b
c
c
a
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