Canon PC981 Service Manual - Page 132
Controlling the Copying Speed in Multifeeder Mode
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CHAPTER 5 PICK-UP/FEEDING SYSTEM 6. Controlling the Copying Speed in Multifeeder Mode The machine does not possess a copy paper width detecting function and, therefore, the tem- perature of the ends of the fixing assembly increases when copies are made continuously on paper narrower than A4/LTR. When the multifeeder is used for continuous copying, a delay is initiated after picking up the 19th sheet so as to increase the sheet-to-sheet distance for the sheets that follow, controlling the copying speed to 9 cpm. If the copying speed is controlled (to 6 cpm) by a mechanism to prevent overheating of the copyboard, this control will not be executed, and moreover if the temperature of the copyboard increases during 9-cpm control, 6-cpm control will be initiated. Switching to 9-cpm copying speed SCRV SCFW SCRV SCFW SCRV SCFW SCRV Main motor (M1) Delivery sensor (PS3) Cassette pickup solenoid (SL5) Pre-registration roller paper sensor (Q751) 19th copy I I: A switch to 9-cpm copying mode is made after delivering the 19th copy in a continuous copying job. Figure 5-108 5-8 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)