Sharp MX-M550U Service Manual page 326

2) When the specified time has passed from detection of the
paper lead edge by POD1 (paper exit detection from fusing),
POM2 rotates in the normal direction, then rotates in the
reverse direction in the specified time. (The rotation time dif-
fers depending on the paper size.)
3) When POM2 rotates reversely, paper is transported to the
reverse section.
At that time, paper is passed over the paper exit gate guide
which fell down by it own weight.
4) When the specified time has passed from reverse rotation of
POM2, DGS (paper exit guide) turns on for a certain time and
paper is sent to the reverse section.
ADM1
POM1
POM2
DGS
POM2
MX-M700N DUPLEX SECTION H – 3
5) POM2 stops after passing the specified time from detection the
paper lead edge by AINPD (duplex paper entry detection). It
rotation is changed from reverse direction to normal direction
to transport the next paper.
RRC
439mS
POM1
120mS
POM2
485mS
572mS
DGS
ADUM1
ADUM2
POD1
POD2
AINPD
APPD1
APPD2
(2) Paper transport speed in duplex print
The transport speed in duplex print is changed to the high speed
(800mm/sec) to increase the job speed in some positions of paper.
The transport speed is changed to the high speed in the Following
positions:
1) From when the paper rear edge passes the fusing section to
when switchback opration is started.
2) From when switchback operation is started to when a certain
amount of paper is transported after passing APPD1 (Paper
pass detection sensor in upstream of duplex).
3) After that, paper is stopped at the duplex paper feed position
and fed to the machine again. (The paper feed speed to the
machine is 335mm/sec)
166mS
25mS
37mS
102mS
50mS 168mS