Canon PC980 Service Manual - Page 171
Controlling the Power Supplied to the Fixing Heater between Sheets - problems
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CHAPTER 6 FIXING SYSTEM 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 SCRV SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Registration clutch solenoid (SL2) Delivery sensor (PS3) Fixing heater (H1) Scanner Heater OFF Heater ON Forward Reverse Figure 6-107 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-7
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CHAPTER 6
FIXING SYSTEM
COPYRIGHT
©
1999
CANON INC.
CANON
PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6-7
Figure 6-107
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
SCRV
SCFW
SCRV
LSTR
STBY
Registration clutch
solenoid (SL2)
Fixing heater (H1)
Scanner
Delivery sensor (PS3)
Main motor (M1)
Forward
Reverse
SCFW
SCRV
Heater ON
Heater
OFF