Canon PC920 Service Manual page 171

5. Controlling the Power Supplied to the Fixing Heater between Sheets
When the copying speed is controlled to 6 cpm to prevent overheating of the copyboard, the
temperature of the fixing lower roller tends to increase because of the increased sheet-to-sheet
distance. To prevent possible problems, power to the fixing heater is stopped between sheets when
the copying speed is controlled to 6 cpm.
Switching to 6-cpm copying speed
Main motor (M1)
Registration clutch
solenoid (SL2)
Delivery sensor (PS3)
Fixing heater (H1)
Scanner
COPYRIGHT © 1999 CANON INC.
SCRV SCFW
Heater OFF
Heater ON
Forward
Figure 6-107
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
SCRV SCFW
Reverse
SCRV LSTR STBY
6-7