Brother MFC640CW - Adjusting Print Head Angle Relative to Carriage; Viewed from the Bottom

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Adjusting print head angle relative to carriage
For optimal image printing, the print head nozzle array must be perpendicular to the head/carriage
unit's line of travel. Manufacturing limitations, however, make perfect alignment impossible during
mass production. The angle must be adjusted at the individual machine level.
The following describes this adjustment mechanism's components and their roles.
Slider L, the slider, and the rib attach the head/carriage unit to the CR chassis. The rib acts as a
pivot for the slider's damping spring pressing the carriage to the rear. Slider L has a skew
adjustment knob that shifts the slider back and forth, adjusting the angle of this backward pressure.
Rotating the skew adjustment knob tilts the entire head/carriage unit, thus adjusting the print nozzle
vertical angle relative to the carriage unit's line of travel.
This knob offers 15 settings, from -7 to +7.
Viewed from the bottom
Slider
CR encoder sensor
Slider L
Head skew
adjuster knob
(Front)
Rib
CR timing belt
CR encoder strip
Absorber spring