C
H
A
P
T
E
R
C
H
A
P
T
E
R
Installing the Lower Tray Unit .........................................................4-3
Network Option NC-4100h (For HL-1850 User Only)4-5
Installing the Network Board...........................................................4-5
RAM Expansion........................................................ 4-9
Installing Additional Memory.........................................................4-13
C
H
A
P
T
E
R
C
H
A
P
T
E
R
Toner Cartridge.............................................................................................. 5-3
TONER LOW Message.................................................................................. 5-4
TONER EMPTY Message ............................................................................. 5-5
Cleaning .......................................................................................5-14
4
4
O
P
T
I
O
N
5
5
R
O
U
T
I
N
S
E
M
A
I
N
T
E
vii
N
A
N
C
E