Brother MFC990CW Service Manual page 209

Document front sensor PCB
(14) Pull the lock arm outwards and take out the document front sensor PCB. Then disconnect
the document front sensor harness from the PCB and release it from the cable guides
provided on the ADF unit.
Document front sensor PCB
Document front sensor
harness
(Left)
Document roller
holder
Document front sensor
actuator
Assembling Note: Route the document front sensor harness through the cable guides
provided on the ADF unit as shown below. Also route the ADF motor harness through the
cable guides together with the document front sensor harness.
Document roller holder
ADF unit
Document front sensor actuator
Lock arm
(Right)
ADF drive unit
Viewed from the bottom
Bottom view
Cable guide
Document front sensor harness
6-25
Document front sensor
actuator
Document front sensor
harness
Document front sensor
PCB
ADF unit
Lock arm
(6_22)
ADF motor harness
Cable guides
(Rear)
ADF drive unit
Document front sensor PCB
(6_30)
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