Brother MFC990CW Service Manual page 115

Inljet mfc/dcp
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Power transmission routes of the ASF motor and paper feed motor
The rotational torque of the ASF motor is transmitted to the ASF/maintenance drive gear which
always meshes with the clutch gear L, as described in
When the mode switching lever is in the left position (normal SF or high-speed feed mode), the
clutch gear L also meshes with the ASF changeover gear which transmits the ASF motor
rotation via a gear train to the paper pull-in rollers.
The rotational torque of the paper feed motor is transmitted via the PF roller gear L to the paper
feed roller that advances paper to the printing start position.
ASF motor
Clutch gear R
ASF/maintenance
drive gear
Idle gear 16
Clutch gear L
ASF changeover
gear
ASF idle gears 17
Paper pull-in gear shaft
Paper feed motor
PF roller gear L
PF motor gear
Ejection idle gear
PF timing belt
Mode switching lever
Left position (ASF mode)
Right position (Purge mode)
Paper feed roller
Paper pull-in
rollers
Paper ejection roller
3-38
Section 3.2.2.2, [ 4
].
Purge gear
ASF motor
Mode switching lever
holder ASSY
ASF idle
gears 17
Paper pull-in
gear shaft
Maintenance
unit
(3_25_BHmini9)
Confidential

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