Detecting Jams; Outline - Canon NP6330 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
VI. DETECTING JAMS
A. Outline
The following eight sensors are used to check the movement of copy paper:
• Pre-registration paper sensor (PS9)
• Separation sensor (PS10)
• Delivery sensor (PS11)
• Vertical path roller 1 paper sensor (PS7)
• Vertical path roller 2 paper sensor (PS8)
• Lower feeder inlet paper sensor (PS12)
• Lower feeder outlet paper sensor (PS13)
• Horizontal registration sensor (PS14)
The copier detects a jam in reference to the presence/absence of paper at a specific
sensor at such times as programmed in the microprocessor in advance.
The copier is equipped with a mechanism to remember the remaining number of
copies to make at time of a jam and the effective copying mode even after the power is
turned OFF for jam removal.
The microprocessor possesses the following sequences of jam detection; it assumes
the presence of a jam also when any of the sensors detests copy paper at power-on.
When a jam is detected, power to the fixing heater (H1,H2) will be cut off and the
copier operation will be stopped immediately; at the same time, the Jam indicator will be
flashed on the control panel and the jam location indicator will also be flashed.
When the jam detection mechanism turns ON, the jam in question will not be counted
as a copy made.
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COPYRIGHT © 1997 CANON INC.
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CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)