Brother MFC9100C Service Manual page 27

2.2.4 Carriage drive mechanism
The carriage motor controls horizontal motion. The motor rotation is transmitted via the motor
pulley to the CR drive belt.
The carriage, which is supported and guided by the carriage rail, is secured to the CR drive belt.
Clockwise and counterclockwise rotations of the carriage motor move the carriage to the right and
left, respectively.
On the back of the carriage is the carriage encoder which tells the control circuitry the current
carriage position counted based on the carriage home position by using the encoder strip attached
to the main chassis.
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