Brother MFC-9420CN Service Manual page 112

(33) Release the two hooks "A" on the lower document chute to remove the ADF sensor PCB
ASSY.
Hooks "A"
(34) Turn the lower document chute upside down.
(35) Release the pins and remove the document hold.
(36) Remove the document spring from the lower document chute.
Document spring
1
Pin
Lower document chute
ADF sensor PCB ASSY
1
1
2
Fig. 5-35
Hooks
3
2
Fig. 5-36
5 -2 5
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Lower document chute
3
Hooks
Document hold
Hook
Pin
1
Confidential