Black Band Appears In Sub Scanning Direction When Scanning Both Sides Simultaneously At Dadf (Duplex Color Image Reader Unit-C1) - Canon imageRUNNER ADVANCE 8105 Series Manual

Symptom
Black band appears in sub scanning direction when scanning both sides simultaneously at
DADF (Duplex Color Image Reader Unit-C1)
[ Inspected by Canon Inc. ]
Description
When scanning both sides simultaneously (feed direction [a]) at DADF on the duplex color image reader
unit-C1 with the serial numbers listed below, black band may appear in sub scanning direction [b]. (Black
band [b] appears on one or both sides.)
- Duplex Color Image Reader Unit-C1: US: HUE28221 - HUE35897
- Duplex Color Image Reader Unit-C1: EUR: HUF16312 - HUF19454
- Duplex Color Image Reader Unit-C1: CN: HVC00034 - HVC00056
- Duplex Color Image Reader Unit-C1: OTHER: HUG11028 - HUG11326
Cause
On the scanner unit [1] inside of the DADF, the light-blocking sheet [3] attached on the mirror spring [2]
comes off and floats [a], causing to block the light path. [A] shows the light-blocking sheet is attached
securely, and [B] shows the light-blocking sheet coming off.
pg. 229