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vii
C
C
H
H
A
A
P
P
T
T
E
E
R
R
4
4
O
O
P
P
T
T
I
I
O
O
N
N
S
S
Optional Accessories................................................ 4-1
Lower Tray Unit (LT-500) ......................................... 4-2
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
IrDA Interface (IR-1000) ......................................... 4-16
Optional Font Package (BS-3000).......................... 4-17
C
C
H
H
A
A
P
P
T
T
E
E
R
R
5
5
R
R
O
O
U
U
T
T
I
I
N
N
E
E
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
Replacing the Consumables..................................... 5-1
Replacing Maintenance Parts........................................................................ 5-2
Toner Cartridge.............................................................................................. 5-3
TONER LOW Message.................................................................................. 5-4
TONER EMPTY Message ............................................................................. 5-5
Replacing the Toner Cartridge....................................................................... 5-5
CHANGE DRUM SOON Message............................................................... 5-11
Replacing the Drum Unit ............................................................................. 5-11
Cleaning.......................................................................................5-14
Cleaning the Printer Exterior ....................................................................... 5-14
Cleaning the Printer Interior ........................................................................ 5-15
Cleaning the Corona Wire ........................................................................... 5-17
Maintenance Messages................................................................5-19