Sharp AL-1043, Service Manual

Page: 36 / 126

AL-1551 OPERATIONAL DESCRIPTIONS 7-9
C. Operational descriptions
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).
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)
SPID ON
PSW ON
MIRM rotation
MM rotation
CPFS ON
SPFM rotation
SPUS ON
Document set
Document set sensor
Document feed unit lamp ON
PPD ON
RRC ON SPPD ON
POD ON
Copy start
The scanner is shifted
to the exposure position.
(Copier side)
Main motor rotation
Paper feed
Synchronization
(Transfer)
(Fusing)
(Document exit)
Paper transport
(Exposure)
In the zooming mode, the magnification ratio in the sub
scanning direction (paper transport direction) is adjusted
by changing the document transport speed.
(Paper exit)
SPF motor rotation
Document feed
Document transport sensor
Document transport
(SPF side)
Time chart (Tray feed)
752msec
625msec
756msec
PSW
MIRR M
SPF M
CL
SPUS
SPPD
SCANST
MAIN M
CPFS1
RRS
PPD1
PPD2
POD
Gate OFF
Lower Side of Gate
Gate ON
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