Height Adjustment Of The Head/Carriage Unit - Brother MFC5490CN Service Manual

Height adjustment of the head/carriage unit

For optimal image printing, a pair of slider cams mounted on the head/carriage unit switches the
height of the head/carriage unit against the CR guide rail and support chassis between two
levels--2.3 mm (for thick paper and envelops) and 1.6 mm (for other types of paper) in order to
bring the optimum distance between the head nozzle surface and paper.
The slider cams can be switched by hitting against the stoppers at the right and left ends of the
CR guide rail and CR support chassis.
CR guide rail
For "thick paper and envelopes" and "other types of paper":
The machine adjusts the distance from the platen to the head/carriage unit to 2.3 mm for "thick
paper and envelopes" and 1.6 mm for "other types of paper" in order to keep the distance ("a")
constant.
For "thick paper and envelopes"
Head nozzle surface
Paper
Platen
Head/carriage unit
Slider cam
"a"
(3_23_1b)
(3_24_2)
3-39
Slider cam
CR support chassis
(3_23_BHL9)
For "other types of paper"
(Paper other than thick paper and envelopes)
Head nozzle surface
"a"
Paper
Platen
(3_23_1a)
(3_24_1)
Confidential