Brother HL-1800 series - Manual (Page 54)

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! Accessories
When you install the optional units, you can add those options and select
their settings in the Accessories tab as follows.
1 You can add and remove the optional units manually.
2
Auto Detect (Automatically Detect the Optional units)
This function detects the optional devices that have been installed.
The available functions are reflected in the printer driver.
When you press “Auto Detect”, options that are installed on the printer
will be listed. You can manually add or delete options. Tray and other
settings will match the installed options.
✒ Note
Auto Detect function is not available according to printer status and printer
condition.
3 Paper Source Setting
“Auto Detect function” recognises the size of paper in each paper tray.
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