Canon 3170 Series - Manual (Page 379)

15-28 Maintenance & Frequently Asked Questions Chapter 15
LASER CLASS 3170 Series.
CFYA/YAH/YAN 120v US V1.0
2. Gently open the upper unit of the ADF cover, as shown in the
illustration below.
C
BE SURE NOT TO OPEN THE ADF COVER FULLY TO THE EXTENT
THAT THE LOWER UNIT IS LIFTED AS SHOWN IN THE
ILLUSTRATION ON THE RIGHT. THE LOWER UNIT MAY FALL
HEAVILY WHEN YOU UNLOCK THE ADF COVER ON STEP 3.