Kyocera Mita DF-75, Service Manual

Page: 59 / 199

2-35
CHAPTER 2 OUTLINE OF OPERATION
4 Delivery Tray Operation
4.1 Outline
The machine has a delivery tray in the finisher unit and a bind tray in the saddle unit.
The bind tray in the saddle unit is of the fixed type and all the folded paper stacks are deliv-
ered to this tray. This tray has a bind tray sensor (PI13) to detect presence/absence of paper.
The delivery tray in the finisher unit is moved up and down using a shift motor (M6).
The finisher has a tray paper sensor (PI8) to detect presence/absence of paper on the stack
tray.
The home position sensor of the delivery tray is detected by the paper surface sensor
(PI19). When paper has already been stacked on the delivery tray, the home position is on the
top surface of the stacked paper. When paper has not yet been stacked on the delivery tray, the
home position is at the position where the edge of the delivery tray is detected. At power-on,
the finisher controller PCB drives the shift motor (M6) to return the delivery tray to the home
position.
When the paper coming from the processing tray is stacked on the delivery tray, the shift
motor is driven a specified number of pulses, causing the delivery tray to descend. Clock
pulses are detected by the shift motor clock sensor (PI17). Then, the delivery tray returns to
the home position for the next stacking operation.
The upper limit of the delivery tray is detected by the shift upper limit sensor (PI15). When
the shift upper limit sensor (PI15) is turned ON, the finisher controller PCB stops the shift
motor (M6) that is ascending.
The lower limit of the delivery tray is detected by the shift lower limit sensor (PI16). When
the shift lower limit sensor (PI16) is turned ON, the finisher controller PCB stops the shift
motor (M6) that is descending.
The finisher unit has a full stack sensor (PI24) to detect overstacking of large-size or mixed
paper according to the stack height.