Read Sharp AR-M351U / AR-M451U (serv.man13) Service Manual online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 36
3.
Paper transport in duplex printing (with AR-DU3/DU4 installed)
(1) Switchback operation and paper exit to the left tray
1) Paper transported from the fusing section is sent to the paper exit section of the machine.
2) When the male bin stacker (AR-MS1) or the finisher (AR-FN5) is installed, the paper entry gate solenoid (FGS) selects the paper entry
gate to discharge paper outside the machine.
3) The paper exit sensor (POD2) detects the rear edge of paper, and the paper exit motor (POM) is rotated reversely.
4) Paper is taken into the machine again, passed over the reverse gate, and transported to the duplex unit.
5) When duplex printing is made, the ADU gate solenoid switches to the upper side of the ADU paper exit gate to switch the paper path to
the ADU.
6) When paper is discharged to the left tray or when paper is transported to the console finisher (AR-FN7), the ADU gate solenoid
switches to the upper side of the ADU paper exit gate to switch the paper path to the ADU.
(2) Paper transport speed in duplex printing
The transport speed may be doubled in duplex printing depending on the paper position.
The positions of double speed are as follows:
1) From when the rear edge of paper passes the fusing section to when switchback operation is started.
2) From switchback operation, after the lead edge of paper passes APPD1, until a certain amount is transported.
3) After that, paper is stopped at the ADU paper feed position, and fed to the laser printer again.
4.
Transport with AR-FN6 installed
The AR-FN6 is provided with the decurler to improve alignment capability of finishing.
The decurler makes decurling against curling of paper by means of the difference in rigidity of the upper roller (metal) and the lower roller
(sponge).
(sponge).
Metal
Sponge
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