Canon imageRUNNER ADVANCE 8500 series Troubleshooting Manual page 71

9) Rotate the gear [1] in the direction of the arrow with fingers and let the front/rear tray auxiliary guide [2] protrude by approximate
10mm longer.
10) Reassemble the parts in reverse order from the step 2).
11) Select the motor being subject to the operation check.
Go to Service mode (Level1) SORTER > FUNCTION > MTR-CHK, enter "17" and press [OK].
[Reference] The tray auxiliary guide motor (M109) will be selected by entering "17".
12) From Service mode (Level1) SORTER > FUNCTION > MTR-ON, press [OK] to drive the tray auxiliary guide motor (M109)
and check the operation of the tray auxiliary guide.
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