Read Sharp AR-SP4 Service Manual online
[5] OPEREATIONAL DESCRIPTIONS
1. Paper feed section major parts
No.
Part name
Operation
1
Document length
sensor (L2)
sensor (L2)
Detects the document length on
the tray.
the tray.
2
Document length
sensor (L1)
sensor (L1)
Detects the document length on
the tray.
the tray.
3
Document length
sensor (W0)
sensor (W0)
Detects the presence of document.
4
Document width sensor
(W1, W2, W3)
(W1, W2, W3)
Detects the document width.
5
Pickup roller
Picks up the document.
6
Paper feed roller
Feed and transport the document.
7
Paper entry sensor
(PAPER)
(PAPER)
Detects the document transport.
8
PS roller
Makes synchronization between
the document lead edge and the
image lead edge.
the document lead edge and the
image lead edge.
9
PS follower roller
Makes synchronization between
the document lead edge and the
image lead edge.
the document lead edge and the
image lead edge.
10
Transport roller
Transports the document.
11
Transport follower roller
Transports the document.
12
Paper exit sensor
Detects transport of documents.
13
Paper exit follower roller
Discharges the document.
14
Paper exit roller
Discharges the document.
2. Brief descriptions of operations
3. Document size detection
Document size detection by document set tray
When a document is set on the document set tray in the auto mode of
paper/copy magnification ratio selection, the document size is de-
tected to perform the auto selection function of paper and the copy
magnification ratio according to the detected document size.
paper/copy magnification ratio selection, the document size is de-
tected to perform the auto selection function of paper and the copy
magnification ratio according to the detected document size.
When documents of different sizes are mixed and set on the tray, the
max. size is detected. The document width is detected by the docu-
ment width sensors (W1, W2, W3), and the document length is de-
tected by the document length sensors (L1, L2) to determine the
document size.
max. size is detected. The document width is detected by the docu-
ment width sensors (W1, W2, W3), and the document length is de-
tected by the document length sensors (L1, L2) to determine the
document size.
The document size judgment is made after a certain time from when
the document set sensor (W0) detects the document.
the document set sensor (W0) detects the document.
Document size
and set direction
Document width sensor
Document
length sensor
W1
W2
W3
L1
L2
AB
series
A5
B5
A5R
A4
B5R
A4R
8.5" x 13"
B4
A3
Inch
series
8.5" x 5.5"
8.5" x 5.5"R
11" x 8.5"
11" x 8.5"R
8.5" x 13"
8.5" x 14"
11" x 17"
[Note] Sensor ON: , OFF:
1
2
3,4 5
6
8
9
10
11
12
13
7
1) Document set (Document set sensor ON)
3) Copy start (Machine)
4) SPF motor ON
5) Pickup solenoid ON
6) Pickup roller and paper feed roller rotation
7) Paper entry sensor detects paper presence.
8) PS roller rotation
9) Copy operation ( Machine)
10) Transport roller rotation
11) Paper exit roller rotation
12) Document exit
YES
13) Next document
NO
2)
14) SPF motor OFF
Document size detection (The document width is detected with
document width sensors W1, W2, and W3, and the document length is
detected with document length sensors L1 and L2.)
document width sensors W1, W2, and W3, and the document length is
detected with document length sensors L1 and L2.)
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