Canon Perfect Binder A1 Troubleshooting Manual page 262

5-5) Release the cable [1] from the edge saddle [2] and the wire saddle [3].
5-6) Disconnect the sensor connector [4] and release the cable from the detection sensor bracket [5].
5-7) Remove the 2 screws [1] and the detection sensor bracket [2].
The photo shows the detection sensor bracket viewed from the left side.
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