C. Operational Descriptions; D. Cases Where A Document Jam Is Caused; E. Rspf (Spf) Open/Close Detection (Book Document Detection); D-D (Duplex To Duplex) Mode Paper/Document Transport (Duplex Model) - Sharp AL-1651CS Service Manual

C. Operational descriptions

Time chart (Tray feed)
Document set
SPID ON
Document feed unit lamp ON
PSW ON
MIRM rotation
(Copier side)
MM rotation
Main motor rotation
Paper feed
CPFS ON
PPD ON
Synchronization
RRC ON
Paper transport
(Transfer)
(Fusing)
POD ON
(Paper exit)
In the zooming mode, the magnification ratio in the sub
scanning direction (paper transport direction) is adjusted
by changing the document transport speed.
PSW
MIRR M
SPF M
CL
SPUS
625msec
SPPD
756msec
SCANST
MAIN M
CPFS1
RRS
PPD1
PPD2
POD

D. Cases where a document jam is caused

1) When SPPD is ON (document remaining) when the power is
turned on.
2) When SPPD is not turned ON within about 1.5 sec (at 100% copy)
after starting the document feed operation.
3) When SPPD is not turned on within about 4.7 sec (at 100% copy)
after turning on SPPD.
4) When the SPF document jam release door or the OC cover is
opened during document transport (SPF motor rotating).
E. RSPF (SPF) open/close detection (book
document detection)
RSPF (SPF) 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 sec-
tion) by the scanner (CCD) and detecting the varied quantity.
B
A
(White Mylar)
Reference line
(CCD)
B
A
Document set sensor
Copy start
The scanner is shifted
to the exposure position.
(SPF side)
SPF motor rotation
SPFM rotation
SPUS ON Document feed
Document transport sensor
SPPD ON
Document transport
(Exposure)
(Document exit)
752msec
(Floating)
Reference line
A - B = Varied quantity of pixels
(pixel)
AL-1651CS OPERATIONAL DESCRIPTIONS 7 - 8
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 sent to the
document exit section
• by the transport/paper exit roller.
• R-SPF gate solenoid ON
• The document is sent to the intermediate tray.
(but not discharged completely.)
• The document is stopped once, then switchback operation is
performed.
(To the back copy)
Paper transport:
The document is passed through the paper feed roller and the PS
roller by the paper feed 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, (but not discharged
completely.)
• It is stopped once and switchback operation is performed.
(To the back copy)