Brother MFC-250C - Manual (Page 36)

Chapter 3
22
Sleep Mode
3
You can choose how long the machine must
be idle (from 1 to 60 minutes) before it goes
into sleep mode. The timer will restart if any
operation is carried out on the machine.
a
Press Menu, 1, 7.
b
Press a or b to choose 1 Min, 2 Mins,
3 Mins, 5 Mins, 10 Mins, 30 Mins
or 60 Mins, which is the length of time
the machine is idle before entering sleep
mode.
Press OK.
c
Press Stop/Exit.