Canon imageRUNNER ADVANCE C3500 III Series Service Manual page 1042

6.
CAUTION:
If the machine comes with a Full Sensor, remove the
tape while paying attention not to damage the sensor.
7.
NOTE:
Do not install it if one of the following options is installed
at the same time.
• Inner 2way Tray
• Inner Finisher
• Staple Finisher
• Booklet Finisher
1020
9. Installation