Brother HL-1020 Service Manual page 226

Environment-Friendly
Economy Printing Mode
This feature will cut your printing cost by saving toner. It is useful to
obtain draft copies for proof-reading. You can select from two
economy modes—25% toner saving and 50% toner saving—through
the Windows printer driver supplied with your printer.
Sleep Mode (Power Save Mode)
When the printer is not used for a certain amount of time, sleep mode
automatically reduces power consumption. The printer consumes less
than 13 W when in sleep mode.
Low Running Cost
Since the toner cartridge is separate from the drum unit, you need to
replace only the toner cartridge after approximately 2,400 pages,
which is cost effective and ecologically friendly. (Some models are
supplied with a starter toner cartridge which must be replaced
after 1,000 pages.)
The actual number of pages printed with each toner cartridge may
vary depending on your average type of print job.
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