Brother DCP6690CW Service Manual page 270

(21) Turn the registration sensor actuator in the direction of the arrow shown below and take it
off the inner chute ASSY. The sensor actuator spring comes off.
(22) Take the registration sensor PCB out of the support arms.
Note: The registration sensor PCB and the PF encoder PCB are assembled with their
harnesses. To completely release the registration sensor PCB from the engine unit,
therefore, you need to remove the PF encoder PCB at the next step.
Support arms
Inner chute ASSY
Cable guide
Actuator support
Registration
sensor actuator
Cable guide
PF encoder/registration
sensor harness
Registration sensor PCB
Support
arms
6-89
Hooking the sensor actuator spring
Sensor actuator spring
Registration sensor actuator
Inner chute
ASSY
Sensor actuator spring
(6_74)
Confidential