Sharp MX-3500N / MX-3501N / MX-4500N / MX-4501N (serv.man12) Service Manual ▷ View online
MX3501N EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 2
B. Sensors, switches
No.
Signal
name
Name
Type
Function/Operation
Active condition
1
SPPD2
DSPF paper pass sensor 2
Transmission type
Detects pass of the paper.
L when paper is detected.
2
SPPD1
DSPF paper pass sensor 1
Transmission type
Detects pass of the paper.
L when paper is detected.
3
SCOV
DSPF upper door open/close sensor
Transmission type
Detects open/close of the upper door.
L when the upper door is open.
4
SPRDMD
DSPF document random sensor
Transmission type
Detects the paper size in random paper feed.
L when paper is detected.
5
STUD
DSPF paper feed tray upper limit
sensor
sensor
Transmission type
Detects the upper limit of the paper feed tray.
L when the upper limit of the
paper feed tray is detected.
paper feed tray is detected.
6
SPED1
DSPF document upper limit sensor
Transmission type
Detects the upper limit of the DSPF document.
L when paper is detected.
7
SPWS
DSPF document width sensor
Volume resistor
Detects the document width of the paper feed
tray upper.
tray upper.
—
8
SPLS1
DSPF document length detection
short sensor
short sensor
Transmission type
Detects the document length of the paper feed
tray upper.
tray upper.
H when paper is detected.
9
SPLS2
DSPF document length detection
long sensor
long sensor
Transmission type
Detects the document length of the paper feed
tray upper.
tray upper.
H when paper is detected.
10
SPPD3
DSPF paper pass sensor 3
Transmission type
Detects pass of the paper.
L when paper is detected.
11
SPPD4
DSPF paper pass sensor 4
Transmission type
Detects pass of the paper.
L when paper is detected.
12
SOCD
DSPF open/close sensor
Transmission type
Detects open/close of the DSPF unit.
L when the DSPF unit is open.
13
SLCOV
DSPF lower door open/close sensor
Micro switch
Detects open/close of the lower door.
L when the lower door is open.
14
SPPD5
DSPF paper pass sensor 5
Transmission type
Detects pass of the paper.
L when paper is detected.
15
SPOD
DSPF paper exit sensor
Transmission type
Detects paper exit of the document.
L when paper is detected.
16
SPED2
DSPF document empty sensor
Transmission type
Detects document empty in the paper feed
tray.
tray.
L when paper is detected.
17
STLD
DSPF paper feed tray lower limit
sensor
sensor
Transmission type
Detects the lower limit of the paper feed tray.
H when the lower limit of the
paper feed tray is detected.
paper feed tray is detected.
2
13
11
10
9
8
7
15
4
12
14
2
3
1
11
12
3
7
8
9
1
13
15
5
4
6
14
10
16 17
17
16
5
6
MX3501N EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 3
C. Motors, clutches, solenoids, PWB and lamps
No.
Signal name
Name
Type
Function/Operation
1
SPUM
DSPF paper feed motor
Hybrid step motor
Drives the rollers, transport rollers and transport rollers in the
paper feed section.
paper feed section.
2
SPFM
DSPF transport motor
Hybrid step motor
Drives the transport roller.
3
SPOM
DSPF paper exit motor
PM step motor
Drives the paper exit roller.
4
SLUM
DSPF lift-up motor
PM step motor
Lifts up or moves down the paper feed tray.
5
SPFC
DSPF paper feed clutch
Electromagnetic clutch
Controls ON/OFF of the rollers in the paper feed section.
6
STRRC
DSPF No.1 resist roller clutch
Electromagnetic clutch
Controls ON/OFF of No. 1 resist roller.
7
STRRBC
DSPF No.1 resist roller brake clutch
Electromagnetic clutch
Performs braking of No. 1 resist roller.
8
STRC
DSPF transport roller clutch
Electromagnetic clutch
Controls ON/OFF of the transport roller 1.
9
SRRC
DSPF No.2 resist roller clutch
Electromagnetic clutch
Controls ON/OFF of No. 2 resist roller.
10
SRRBC
DSPF No.2 resist roller brake clutch
Electromagnetic clutch
Performs braking of No. 2 resist roller.
11
SPFFAN
DSPF cooling fan motor
DC brush-less motor
Cools the motors and the clutches.
12
—
DSPF control PWB
—
Control PWB for DSPF
13
—
DSPF flash PWB
—
Program ROM PWB for DSPF
14
—
DSPF driver PWB
—
Driver PWB for DSPF
15
—
DSPF CCD PWB
—
Scans document images.
16
—
DSPF CL inverter PWB
—
Drives the copy lamp.
17
DSPF COPY LUMP
DSPF copy lamp
Xenon lamp
Radiates light onto a document to allow the CCD to scan
document images.
document images.
17
15
9
16
10
8
11
14
13
12
4
1
3
5
7
2
6
MX3501N OPERATIONAL DESCRIPTIONS 4 – 1
MX3501N
Service Manual
[4] OPERATIONAL DESCRIPTIONS
1. Document size detection
Size detection on the document tray
The document size is detected by the DSPF document width sensor (SPWS), and the document length is detected by the DSPF document
length sensors (SPLS1, SPLS2). The document size is judged from the document width and the document length as shown in the table below.
When, however, documents of different sizes are mixed and set on the document tray, the largest size is detected.
The document size is detected by the DSPF document width sensor (SPWS), and the document length is detected by the DSPF document
length sensors (SPLS1, SPLS2). The document size is judged from the document width and the document length as shown in the table below.
When, however, documents of different sizes are mixed and set on the document tray, the largest size is detected.
2. Timing chart
To increase the document replacement speed, pre-feed of the second and the later documents is performed for documents of A4/Letter or
smaller sizes. Therefore, a clutch is provided for each transport roller to perform individual control.
An electromagnetic brake is provided for each transport roller in order to reduce loads to the motor in comparison with a mechanical brake.
smaller sizes. Therefore, a clutch is provided for each transport roller to perform individual control.
An electromagnetic brake is provided for each transport roller in order to reduce loads to the motor in comparison with a mechanical brake.
Document size
Document length sensor
SPLS1
SPLS2
AB series
A5
OFF
OFF
B5
OFF
OFF
11" x 8.5"
OFF
OFF
A4
OFF
OFF
B5R
ON
OFF
A4R
ON
OFF
8.5" x 13"
ON
ON
B4
ON
ON
A3
ON
ON
11" x 17"
ON
ON
Inch series
8.5" x 5.5"
OFF
OFF
11" x 8.5"
OFF
OFF
A4
OFF
OFF
11" x 8.5"R
ON
OFF
8.5" x 13"
ON
ON
8.5" x 14"
ON
ON
A3
ON
ON
11" x 17"
ON
ON
SPWS
SPLS1
SPLS2
SPFC
DSPF paper feed clutch
DSPF paper feed clutch
SPFC
DSPF paper feed clutch
DSPF paper feed clutch
SPFM
DSPF transport motor
DSPF transport motor
SPPD4
DSPF paper pass sensor 4
DSPF paper pass sensor 4
STRC
DSPF transport roller clutch
DSPF transport roller clutch
SRRC
DSPF No.2 resist roller clutch
DSPF No.2 resist roller clutch
SPOD
DSPF paper exit sensor
DSPF paper exit sensor
SPOM
DSPF paper exit motor
DSPF paper exit motor
SPPD5
DSPF paper pass sensor 5
DSPF paper pass sensor 5
SRRBC
DSPF No.2 resist roller brake clutch
DSPF No.2 resist roller brake clutch
STRRBC
DSPF No.1 resist roller brake clutch
DSPF No.1 resist roller brake clutch
SPRDMD
DSPF random sensor 1
DSPF random sensor 1
SPPD1
DSPF paper pass sensor 1
DSPF paper pass sensor 1
SPPD2
DSPF paper pass sensor 2
DSPF paper pass sensor 2
SPPD3
DSPF paper pass sensor 3
DSPF paper pass sensor 3
STRRC
DSPF No.1 resist roller clutch
DSPF No.1 resist roller clutch
39.3mm
37.6mm
12.3mm
11.8mm
Transport speed 314mm/s Letter single-surface transport
Copy key ON
Timer from ON
Timer from ON
SPFFAN
DSPF cooling fan motor
DSPF cooling fan motor
SPUM
DSPF paper feed motor
DSPF paper feed motor
OC scanner scanning
Built-in scanner scanning
ON simultaneously with print start of each motor
OFF at 500ms after SPCD OFF of the last paper
OFF at 500ms after SPCD OFF of the last paper
ON simultaneously with SPPD2_ON
OFF at 69.4ms after SPPD2_OFF
OFF at 69.4ms after SPPD2_OFF
ON at 12.3mm - 10ms (29ms) after SPPD3 ON
(SIM adjustment)
OFF at 11.8mm (38ms) after SPPD3 OFF
(SIM adjustment)
OFF at 11.8mm (38ms) after SPPD3 OFF
ON simultaneously with SPPD3 ON
OFF at 10ms before SRRC ON
OFF at 10ms before SRRC ON
Scanning start at 37.6mm (120ms) from
SPPD4 ON (SIM adjustment)
SPPD4 ON (SIM adjustment)
Scanning start at 39.3mm (125ms) from
SPPD5 ON (SIM adjustment)
SPPD5 ON (SIM adjustment)
Reduces the speed simultaneously with SPOD OFF,
reduces the speed up to 1855PPS in 15.7mm
Drives for 15mm and returns to 3709PPS in 15.7mm.
reduces the speed up to 1855PPS in 15.7mm
Drives for 15mm and returns to 3709PPS in 15.7mm.
(Common to each paper size)
MX3501N DISASSEMBLY AND ASSEMBLY 5 – 1
MX3501N
Service Manual
[5] DISASSEMBLY AND
ASSEMBLY
1. Exterior section
A. DSPF unit
1)
Remove the upper cabinet rear cover lid. Remove the screw,
and remove the upper cabinet rear cover.
and remove the upper cabinet rear cover.
2)
Remove the screw, and remove the earth line. Disconnect the
connector, and remove the snap band. Remove the screw, and
remove the locking band and the interface harness cover.
connector, and remove the snap band. Remove the screw, and
remove the locking band and the interface harness cover.
3)
Loosen the screw, and lower the angle adjustment plate.
4)
Open the DSPF unit to put it straight up, and remove the
screw.
screw.
5)
Slide the DSPF unit to the rear side, and fit the step screw with
the key hole of the hinge, and lift it up to remove.
the key hole of the hinge, and lift it up to remove.
(1) Front cabinet
1)
Open the upper door, and remove the screw.
1
2
1
2
3
1
2
1
2
2
1
2
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