Sharp AR-M351N, Service Manual

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AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 56
C. Operational descriptions
(1) Document feed, transport, scan, paper exit, and
operating speed
The document fed by the take-up roller is sent through the paper
feed roller and the transport roller to the resist roller section.
In the resist roller section, the document lead edge and the scan
start position are synchronized. The document is transported to
the scan section. After being scanned, the document discharged
to the document exit tray by the paper exit roller.
The document transport speed varies depending on the scan
mode and the scan magnification ratio as shown below.
1
2
5
7
8
10
12
3
4
6 9
11
Code
Signal
name
Name Function/Operation Type Note
SCOV SCOV SPF cover switch SPF cover open/close detection Transmission type Sensor
SPFM SPFM1 SPF paper feed motor, paper
transport motor Drives the paper feed roller and the
transport roller. (SPF) Stepping motor
SPFC SPFC SPF paper feed clutch SPF paper feed section roller ON/OFF
control Electromagnetic clutch
SRRC SRRC SPF resist roller clutch SPF resist roller ON/OFF control Electromagnetic clutch
SPED SPED SPF document set detector SPF document presence detection Transmission type Sensor
SPPD SPPD SPF document paper pass detector SPF document paper pass detection 1 Transmission type Sensor
SPFS SPFS SPF document pickup solenoid SPF document pickup Solenoid
STMP STMP FAX finish stamp solenoid Drives the FAX document finish stamp. Solenoid
SPLS1 SPLS1 SPF document length detector 1 SPF document length detection (Short) Transmission type Sensor
SPLS2 SPLS2 SPF document length detector 2 SPF document length detection (Long) Transmission type Sensor
SPFVR SPFVR SPF document size (Width)
detection analog data detector SPF document size (Width) detection Volume resistor Other
detector
SOCD SOCD SPF open/close detector SPF unit open/close detection Transmission type Sensor
SPOD SPOD SPF paper exit detector SPF paper exit detection Transmission type Sensor
No. Name Function
1 CIS unit
(AR-EF3 only) This is an image sensor unit to scan the back of a document. An image sensor (CIS: Contact
Image Sensor) of 7,196 pixels is employed. The scan resolution is 600dppi.LED lights in the
unit are reflected onto the document. Lights reflected from the document are passed through
the lens to form images on the photoelectric conversion elements.
The photo energy is converted into electric energy.
2 Document resist roller This roller makes synchronization between the document lead edge and the scan start
position.
3 Document resist front sensor
(SPPD) Detects that a document reaches the resist roller.
4 Document set sensor Detects that a document is set on the tray.
5 Document feed roller Feeds documents.
6 Separation plate The rubber plate prevents against duplicated feed of documents.
7 Document length sensor
(SPLS1/SPLS2) Detects the document length to detect the document size.
8 Document width detection volume Detects the document width to detect the document guide.
9 SPF motor Transports a document in the SPF.
10 Document take-up roller Picks up a document and transport it to the document feed roller.
11 Document exit roller Discharges a document.
12 Document exit sensor (SPOD) Detects document exit.
Scan mode Magnification ratio
Document
transport speed
Single surface scan/
Duplex scan 100% or above 220mm/sec
Single surface scan/
Duplex scan 101% or above 110mm/sec
High image quality 110mm/sec
FAX 167.1mm/sec