Others; Fan; Outline - Canon iR1200 Series Service Manual

CHAPTER 4 OPERATION

8 Others

8.1 Fan

8.1.1 Outline

The machine is equipped with a single fan at the rear of the delivery assembly to cool the
laser scanner unit, to discharge heat from around the fixing assembly, to cool the elements
of the PCBs, and to discharge ozone.
The fan is controlled by the CPU on the DC controller PCB for the following:
• full-speed rotation while the main motor is in operation.
• full-speed rotation for 30 sec and half-speed rotation for 60 sec after the main motor
stops.
• full-speed rotation for 30 sec and half-speed rotation for 60 sec during WAIT.
The CPU on the DC controller PCB generates the fan drive signal (FANON) based on the
state of the fan stop signal (FANSTOP; 0: reset, 1: rotate) and the full-speed/half-speed
switch signal (FANHALF; 0: half-speed, 1: full-speed) to control the fan rotation to any of
three: rest, half-speed, full-speed.
• Power supply PCB
• DC controller PCB
Fixing assembly
4-34
COPYRIGHT © 2002 CANON INC.
Main motor
Cartridge
F04-801-01
2000 2000 2000 2000 CANON iR1200/iR1300 Series REV. 0 AUG. 2002
Laser scanner unit