Brother DX-2000, Руководство по обслуживанию

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II-1
CHAPTER II MECHANICAL SYSTEM
1. BLOCK DIAGRAM
The Duplex unit is composed of an outside frame, an inside frame and a Duplex tray, and
operates according to signals sent from the printer in serial communication.
Fan motor
Reversible motor
Reverse sensor
Solenoid
Main PCB
Inside frame Outside frame
Printer
Open cover sensor
Paper pressure motor
Cassette sensor
Serial
communication
Duplex tray
I/F PCB
Figure 2.1
2. PAPER FEED MECHANISM
As soon as the printer requests for drive, a signal from the main PCB turns on the
solenoid to run the reversible motor clockwise (when viewed from the motor output shaft).
The Duplex unit will draw paper from the printer by turning on the solenoid.
The supplied paper is further transferred by the reversible motor driven reversible gears.
When the reverse sensor detects the rear end of the paper, the reversible motor comes
to a momentary stop, and begins running counterclockwise.
Then the reversible motor enables the carriage rollers to feed the paper into the Duplex
tray installed within the Duplex unit. With the printer’s Duplex sensor on, the Duplex unit
stops the reversible motor by a request from the printer.
One cycle of paper feeding operation is completed in this way.
Duplex unit Printer
Solenoid
Du carriage roller
Reversible
motor
Reversible gear
Reverse
sensor
Main PCB
Duplex sensor
Pick up roller
Photosensitive drum
Positioner
Figure 2.2