Brother HL-4200CN Service Manual page 59

8) Push the paper tray completely back into the printer.
Note:
Do use excessive force on the paper tray. Doing so could damage the paper tray
or the inside of the printer.
Note:
There is an indicator next to the paper tray that tells you how much paper remains
in the tray. Use the meter as a guide to refill the paper tray.
Fig.2-39
Fig.2-40
II-16