Canon NP6251 Service Manual page 356

Notation Name
FM2 Exhaust fan
FM3 Fixing assembly
heat exhaust
fan
FM5 Developing fan
FM6 Feeding fan
FM7 Cleaner fan
FM8 Scanner cooling
fan
The following fans are controlled to two different speeds: full rotation and half
rotation. As shown in Figure 7-202, each circuit is switched between +24 and +12V
voltages by the CPU on the DC controller PCB.
• Exhaust fan (FM2)
• Feeding fan (FM6)
• Cleaner fan (FM7)
• Scanner cooling fan (FM8)
When the FMFLL signal from the CPU goes '1', +24 V will be supplied so that the fan
rotates at full speed; when the FMHLF signal goes '1', on the other hand, +12 V will be
supplied so that the fan rotates at half speed.
DC controller PCB
CPU
COPYRIGHT © 1997 CANON INC.
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Orientation
Blowing
Drawing
Drawing
Drawing
Drawing
Blowing
Table 7-201
+24v
+12v
FMFLL
FMHLF
Figure 7-202
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
Filter
Ozone Discharges exhaust from each fan
to the outside of the machine.
Prevents increases in temperature
inside the machine caused by the
fixing heater. Exhausts silicone oil
vapors.
Draws toner astray near the
developing assembly.
Keeps copy paper close to the
feeding belt.
Prevents increases in temperature
inside the machine.
Air, dust- Cooling the scanner, cooling the
proofing primary charging assembly.
Function
FM
Fan
7-7