Canon LBP351 Series Service Manual page 36

Envelope Pickup Motor
Envelope Presence Sensor
Envelope Double Feed Sensor
● Envelope Double Feed Detection
The Envelope Feeder can detect double feeding.
A double feed jam is detected when the Sensor Flag moves away from the Double Feed Sensor surface due to the paper thickness.
Envelope multiple-feed sensor (PS1802)
Envelope multiple-feed sensor flag
Envelope Pickup Motor
Name
Name
M1800
PS1800
PS1802
<Normal-feed>
Upper separation roller
Lower separation roller
<Multiple-feed>
M1800
29
2. Technical Explanation (Device)
Electric code
Multiple-fed envelope
Electric code