Sharp AR 168D - Digital Imager B/W Laser, Service Manual, Page: 41 / 184

AR-168S/168D OPERATIONAL DESCRIPTIONS 7 - 7
(3) Conditions of occurrence of paper misfeed
a. When the power is turned on:
PPD or POD is ON when the power is turned on.
b. Copy operation
6. SPF/RSPF section
A. Outline
The RSPF (Reverse Single Path Feeder) is installed to the AR-168D
and the SPF (single path feeder) is installed to the AR-168S as a stan-
dard provision, and it automatically copies up to 30 sheets of docu-
ments of a same size. (Only one set of copies)
B. Document transport path and basic composition
(RSPF)
(SPF)
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).
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.
a PPD1 jam PPD1 does not turn off within 4 sec after turning
on the resist roller.
b PPD2 jam PPD2 is off immediately after turning on the
resist roller.
PPD2 does not turn off within 1.2 sec after
turning off the resist roller.
c POD jam POD does not turn on within 2.9 sec after turning
on the resist roller.
POD does not turn off within 1.5 sec - 2.7 sec
after turning off PPD2.
1 Pickup roller 2 Sheet of document for paper feed
3 Set detection ACT 4 Paper stopper
5 Document feed roller 6 Separation sheet
7 Paper entry sensor 8 PS roller D
9 Transport follower roller 10 Paper exit roller
11 Paper exit follower roller 12 Document tray
13 Switch gate (RSPF)
1 4 3
5 6 7 12
8 9 2 11 13 10
2
1
3
4 5
6
7
8
9
10
11
12
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
B
A
B
A
A - B = Varied quantity of pixels
(pixel)
(Floating)
(White Mylar)
(CCD)
Reference line Reference line