Brother DCP-8085DN Service Manual page 46

3.2.2 ADF unit
The ADF unit is equipment which sends one document or the document for every plurality to
the ADF scanning part of the scanner unit, and performs continuation scanning. As for the
ADF of this machine, the duplex scanning is also possible.
Performance of the ADF
- The number of maximum capacity: Up to 50 sheets
- Maximum resolution: Up to 600dpi
- Maximum scanning speed: 32 pages/minute (Letter size) (Simplex scanning)
- Maximum input media size: Width 148.0mm, Length 148.0mm
- Minimum input media size: Width 215.9mm, Length 355.6mm
1. Function of each roller
- Pick-up roller
Send the document of the inserted ADF to the inside of the ADF.
- Separation roller
Separate the sent document one by one.
- Paper feed roller 1, 2, 3, 4
Send the document.
- SB (switch back) roller ASSY
When the duplex scanning, this motor is rotated by contraries, draws the sent out
document to the inside of ADF again.
- Eject roller
Eject the document.
2. Function of each sensor
- Document front sensor 1
Detects whether the document is set in the ADF.
- Document front sensor 2
Detects whether the document is sent by the separation roller.
- Document rear sensor
Detect the timing of the scanning start of the document.
- Switch back sensor
When the duplex scanning, detect the timing of the reversing of the SB roller by the
document passed.
- Document cover open sensor
Detects whether the document cover is opened or not. Even if the document is set into
the ADF, the machine starts scanning the document glass ignoring the ADF.
3. Function of each motor/solenoid
- ADF motor
Driving source of overall ADF.
- Paper feed solenoid
The paper feed solenoid stops the driving of the pick-up roller and separation roller
while the document is drawn in order to prevent that the next document is drawn into
the ADF while duplex printing.
- Switch back solenoid
Switches the direction of rotation of the SB roller ASSY.
14 sides/minute (Letter size) (7pages/minute) (Duplex scanning)
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