Description Of Tandem Lcf Operation - Toshiba e-STUDIO520 Service Manual

9.3.6

Description of Tandem LCF Operation

[A] After power is ON to ready
(1) When the equipment is turned ON, the pre-running operation at warming up is started. The tan-
dem LCF tray-up motor (M41) starts to rotate forward and raises the feeding side tray. When the
tray turns ON the tandem LCF tray-up sensor (S44), the tandem LCF tray-up motor (M41) is
turned OFF, and then the tray is stopped. At this time, when the tandem LCF empty sensor (S43)
is ON, it is judged that there is paper in the feeding side tray. On the other hand, the absence of
paper in the feeding side tray is assumed when the tandem LCF empty sensor (S43) is OFF, and
the standby side empty sensor (S74) is subsequently checked. When the standby side empty
sensor (S74) is OFF, that means there is no paper in the standby side tray, and it is therefore
assumed that there is no paper in the tandem LCF. When the standby side empty sensor (S74) is
ON, the paper in the standby side tray is moved to the feeding side tray.
The tandem LCF tray-up motor (M41) is rotated in reverse and lowers the feeding side tray. The
lowered tray turns ON the tandem LCF bottom sensor (S71), and the tandem LCF tray-up motor
(M41) is turned OFF to stop the tray. The tandem LCF end fence solenoid (SOL8) and tandem
LCF pickup solenoid (SOL7) are then turned ON.
The tandem LCF end fence motor (M42) rotates forward and the paper in the standby side tray is
moved onto the tray of the feeding side. The tandem LCF end fence motor (M42) is stopped for a
second when the end fence stop position sensor (S75) is turned ON, and the motor (M42) imme-
diately starts to rotate in reverse to return the end fence to the position where the end fence
home position sensor (S73) is turned ON.
When the returning operation is started, the tandem LCF end fence solenoid (SOL8) and tandem
LCF pickup solenoid (SOL7) are turned OFF, and the tandem LCF tray-up motor (M41) is rotated
forward to raise the feeding side tray. The tandem LCF tray-up motor (M41) is turned OFF when
the tray being raised turns ON the tandem LCF tray-up sensor (S44) and stops the tray. At this
time, the presence of paper is judged when the tandem LCF empty sensor (S43) is ON.
(2) If the power is turned ON when the drawer has been removed, the tray raising movement is not
operated. The tray is raised as soon as the drawer is installed, and it detects if there is paper in
the drawer.
(3) If either of the tandem LCF feed sensors (S46) is ON (paper remains on the transport path) when
the power is turned ON, that means a paper jam has occurred and the operation is disabled until
the paper is removed.
[B] Ready status
(1) Trays detect the paper as described in [A], and the equipment goes into the ready status.
(2) The tray goes down automatically when the drawer is removed. It is raised as soon as the drawer
is reinstalled and checks if there is paper in the drawer.
[C] From the start to the end of printing
(1) The feed motor (M20) starts driving when the [START] button is pressed.
(2) When the equipment judges that the tandem LCF is ready for feeding paper, it turns ON the tan-
dem LCF feed clutch (CLT10). This clutch drives the pickup roller and feed roller to feed paper
from the tray.
e-STUDIO520/600/720/850 PAPER FEEDING SYSTEM
9 - 12
March 2005 © TOSHIBA TEC