Adf Unit - Brother DCP-8070D Service Manual

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 document 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: CCD model Up to 50 sheets, CIS model Up to 20 sheets
- Maximum resolution: Up to 600dpi
- Maximum scanning speed: 32 pages/minute (Letter size) (Simplex scanning)
- Maximum input media size: Width 215.9mm, Length 355.6mm
- Minimum input media size: Width 148.0mm, Length 148.0mm
1. Function of each roller
- Pick-up roller
Send the document from on the ADF into the ADF.
- Separation roller
Separate the sent document one by one.
- Paper feed roller 1, 2, 3, 4
Send the document.
- 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 switch back 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.
14 sides/minute (Letter size) (7pages/minute) (Duplex scanning)
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