Oce 3121, Technical & Service Manual

Page: 691 / 908

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ed.1 21 Sorter 541
c. Monitoring the position of the trays
The position of the trays is monitored by the microprocessor Q7 on the tray
control PBA. The tray position detection signal (TPD) is emitted by the posi-
tion sensor PI12.
■
Moving the tray to the rear
The microprocessor (Q7) on the tray controller PCB judges that the special
tray has shifted to the rear when the edge of the crescent pulley blocks the
tray position sensor (PI12), i.e., when TPD goes from ‘0’ to ‘1’, and stops the
tray shift motor (M7).
■
Moving the tray to the front
The microprocessor Q7 considers the tray to be in the front position when the
crescent leaves the position sensor PI12. The tray movement motor M7
stops.
Direction
of rotation Direction
of rotation
Special tray at rear
(top view)
Special tray at front
(top view)
Tray position
Sensor (PI12)
Crescent
pulley
tray position
sensor PI12
direction
direction
crescent
pulley
special tray at rear
(top view) (top view)
special tray at rear
Crescent pulley
(makes a 1/2 rotation for
each shift of the tray)
Tray shift motor
(M7)
crescent pulley
(makes a 1/2 rota-
tion for each shift of
the tray)
tray shift motor M7