Canon PIXMA MP950 Service Manual page 20

(V) Disconnect the cables which connect the scanner unit and FAU to the logic board and panel relay board.
The left photo: before disconnecting the cable
The right photo: after disconnecting the cable
[See 3-2. Connector Location and Pin Layout.]
(VI) Remove the scanner stop arm.
- While holding the scanner unit, disengage the scanner stop arm from the main case unit.
- Disengage the scanner stop arm from the scanner unit by slightly twisting the scanner stop arm.
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