Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 7 PICK-UP/FEEDING SYSTEM
7-14
B. Types of Jam
The DC controller PCB microprocessor (IC301) determines there is a jam in the fol-
lowing situations
a. Delay jam
The copy paper has not arrived in the sensor area within a stipulated period of time
(not detected by the sensor).
b. Stationary jam
The paper has not left the sensor within a stipulated period of time after the sensor
has detected the copy paper (the sensor has not turned OFF).
c. Residual paper jam
When power is turned on paper is left behind in the sensor area (the sensor detects
copy paper).
C. Jam sequence
1. Pick-up delay jam
■ Detection by the pick-up sensor (PS303)
At the time of cassette pick-up, when paper has not arrived at the pick-up sensor
(PS303) within approx. 3 seconds after the pick-up solenoid (SL301) has been turned
ON, the retry operation will take place. If, during the retry pick-up operation the pick-up
sensor does not come ON within approx. 3 seconds after the pick-up solenoid comes
ON, it is judged there is a delay jam.
Figure 7-602
Pick-up solenoid
(SL301)
Pick up sensor
jam check
Pick-up sensor
(PS303)
Main motor
(M601)
Start signal
3.0 sec.
Normal
2nd sheet pick-up
Retry pick-up
Abnormal
3.0 sec.3.0 sec.
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