Spf/Rspf Open/Close Detection (Book Document Detection); D-D (Duplex To Duplex) Mode Paper/ Document Transport (Duplex Model); Initial State; Front Copy - Sharp AL-2020 Service Manual

AL-2050/2060
PSW
MRMT
SPF M
CL
SPUS
SPPD
SCANST
SRVC
SRJD
MAIN M
CPFS1
RRS
PPD1
PPD2
POD
RSPF JAM generation condition
1) The SPPD is ON when turning ON the power.
2) The SPPD does not turn ON for 4.0sec from starting document
feed. (in 100% copy)
3) The SPPD does not turn OFF for 4.7sec after detecting turning
ON of the SPPD. (100% copy)
4) The RSPF cover or the OC cover is opened during document
transportation.
5) The SRJD is ON when the power is turned ON.
6) The SRJD is not turned ON for 2.4sec from release of PS in
paper feed from the document set position. (100% copy)
7) The SRJD is not turned OFF for 1.6sec from completion of doc-
ument scan in the case of complete document exit. (100%
copy)
D. SPF/RSPF open/close detection
(book document detection)
SPF/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.
B
A
(White Mylar)
Reference line
(CCD)
B
A
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.
1200msec
(Floating)
Reference line
A - B = Varied quantity of pixels
(pixel)
AL-2020/2035/2040/2050/2060 OPERATIONAL DESCRIPTIONS 7 - 9
560msec
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)