Sharp AL-2051 Service Manual download pdf (Page 44)

AL-2051 OPERATIONAL DESCRIPTIONS 7 - 9

D. RSPF open/close detection

(book document detection)

RSPF open/close detection (book document) detection is per-

formed by detecting the interval between the reference lines on the

white Mylar attached to the paper exit guide (document scanning

section) by the scanner (CCD) and detecting the varied quantity.

Note: When replacing the carriage unit, be sure to execute SIM41-

06.

If SIM41-06 is not executed, the carriage unit may not read

the reference line on the white Mylar, preventing the docu-

ment from being fed.

8. D-D (Duplex to Duplex) mode paper/

document transport (Duplex model)

A. Initial state

Set duplex documents on the document tray.

Set paper on the cassette. (In the duplex mode, the manual feed

tray cannot be selected.)

B. Front copy

Document transport:

The document feed roller feeds the document from the paper feed

roller to the PS roller.

• The document is exposed in the exposure section, and trans-

ported to the document exit section by the lower transport roller

and the paper exit roller.

• The document is transported to the paper exit tray. (However, it is

not discharged completely.)

• The document is stopped once, and then switchback operation is

performed. (To the back copy)

Paper transport:

The paper is passed through the paper feed roller and the PS roller,

and the images on the front surface are transferred.

• The paper is passed through the fusing section and the lower

side of the gate section to the paper exit tray side. (However, it is

not discharged completely.)

• The paper is stopped once, and switchback operation is per-

formed. (To the back copy)

C. Back copy

Document transport:

By switchback operation, the document is sent through the upper

transport roller and the PS roller to the exposure section, where the

back surface of the document is exposed.

• The document is sent to the document exit section by the lower

transport roller and the paper exit roller.

• The document is sent to the intermediate tray. (However, it is not

discharged completely.)

• The document is stopped once, and switchback operation is per-

formed.

• The document is sent through the upper transport roller and the

PS roller and the exposure section (without being exposed) to the

document exit section.

• The document is discharged to the document exit tray.

Paper transport:

Switchback operation is performed.

• The paper is sent through the upper side of the gate section and

the duplex transport section and the PS roller, and the images on

the back surface are transferred.

• The paper is sent through the fusing section and discharged to

the paper exit tray.

A - B = Varied quantity of pixels

(pixel)

(Floating)

(White Mylar)

(CCD)

Reference line Reference line

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 138 139

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Sharp AL-2051 Service Manual Page 44

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