Chapter 5 Periodic Maintenance; Consumable Parts; Drum Unit - Brother HL-1850 Service Manual

CHAPTER 5
To avoid creating secondary problems by mishandling, follow the warnings below during
maintenance work.
(1) Always turn off the power switch and unplug the power cord from the power outlet
before accessing any parts inside the printer.
(2) Some parts inside the printer are extremely hot immediately after the printer is used.
When opening the front cover or rear cover to access any parts inside the printer,
never touch the red colored parts shown in the following figures.
1.

CONSUMABLE PARTS

The consumable parts described in this section are parts which are subject to deterioration or
damage and should be replaced at least once during the period of warranty of the product if
any print quality problem appears.
1.1

Drum Unit

The “CHANGE DRUM SOON” message appears on the LCD display when the drum unit is
nearly at the end of its life.
Life expectancy:
NOTE:
There are many factors that determine the actual drum life, such as temperature, humidity,
type of paper and toner that you use, etc.
<Replacement Procedure>
(1) Press the cover release button; and
then open the front cover.
(2) Pull out the drum unit assembly.
(Fig.5-1)
PERIODIC MAINTENANCE
20,000 pages
(When printing A4 or Letter size paper at 5% print coverage)
WARNING
5-1
HL-1850/1870N SERVICE MANUAL
Fig. 5-1