Brother HL-4000CN, Service Manual

Page: 108 / 345

III-30
5.5 Chute ASSY Out
5.5.1 Major functions
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Sensor photo (Full stack sensor)
Detects that the prints discharged onto the top cover have accumulated more than
specified number of sheets based on the change of position of the actuator.
(Full stack: Sensor beam is received)
•
Sensor photo (Dug jam sensor)
Detects that paper has reached and passed through the roll DUP based on the change
of position of the actuator.
(Paper present: Sensor beam is received)
•
Sensor photo (MSI no paper sensor)
Detects existence or non existence of paper on the manual feed tray based on the
change of position of the actuator.
(No paper: Sensor beam is intercepted)
•
Solenoid feed MSI
Controls the operation (rotation/stop) of roll ASSY feed by controlling the rotations of
the gear MSI.
•
Roll ASSY feed
When the solenoid feed MSI operates, the gear MSI and gear idler are engaged by the
force of the spring SOL, the roll ASSY feed starts rotating under the drive from the
main drive ASSY, and feeds paper from the manual feed tray.
After having rotated one turn, the gear MSI and gear idler are disengaged at the notch
of the gear MSI, drive is not transmitted any more, and the roll ASSY feed stops
rotating. Thus sheets of paper are fed one by one.
•
Roll DUP
The roll DUP rotates under the drive from the motor ASSY DUP and feeds paper
printed on simplex returned from the chute ASSY exit to the roll turn (refer to "5.3
Housing ASSY Retard)".