Brother HL-3450CN - Manual (Page 118)

CHAPTER 5 MAINTENANCE
5-2
The following are Maintenance Messages that appear on the LCD in the
READY state. These messages provide advance warnings to replace the
consumable items before they run out. To avoid any inconvenience, you
may want to purchase spare consumable items before the printer stops
printing.
LCD Operator Call
message Consumable
to Replace Approximate
Life How to
Replace Order No.
READY
! " " "
K C M Y
Toner
Cartridge,
Black
14,000 pages
*1 *2
See 5-6 TN-02BK
READY
" ! ! !
K C M Y
Toner
Cartridge,
Cyan /
Magenta /
Yellow
8,500 pages
*1 *2
See 5-6 TN-02C
TN-02M
TN-02Y