CHAPTER 5 PICK-UP/FEEDING SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)5-8Figure 5-1091. Multifeeder Pickup Assembly (no paper, pickup delay jam)If copy paper does not reach the pre-registration roller paper sensor within a specific period oftime in multifeeder mode, the condition will be identified as the absence of paper; the machine willstop the main motor in about 1.5 sec, and indicate the Add Paper message.If the pre-registration roller paper sensor detects copy paper during this 1.5 sec period (ap-proximate), the machine will identify the condition as a pickup delay jam, and flash the Jam indica-tor.Multifeeder pickup rollerCassettepickup rollerVerticalpathrollerQ751 PS4Photosensitive drumCassetteFixing assemblyDelivery rollerPS3Registration rollerD. Detecting JamsThe machine is equipped with three paper sensors used to find out the presence/absence ofcopy paper and whether copy paper is moving properly.• Vertical path roller paper sensor (PS4)• Pre-registration roller paper sensor (Q751)• Delivery sensor (PS3)The presence/absence of a jam is checked with reference to the presence/absence of paper overa specific sensor at such times as programmed in the microprocessor.The machine keeps a record of the remaining number of copies to make or the copy modeeffective at time of a jam.The microprocessor possesses the following seven types of no paper/jam detection sequence; ifany of its sensors detects copy paper at power-on, the machine will identify the condition as a jam.
