Fan; Iii. Fan; Rotation Control Mechanism - Canon GP160DF Service Manual

III. FAN

A.

Rotation control mechanism

This unit has been equipped with an exhaust fan motor (FM301), located at the rear
of the printer assembly. The fan motor Hall element has a built-in 2 phase 4 pole DC
brushless motor, and is integrated with the motor drive circuit.
The DC controller PCB's CPU (IC301) controls the rotation of the fan motor.
When the power switch of the main unit is turned ON, the DC controller PCB's CPU
(IC301) sends out the half-speed rotation signal (HALFFAM*) "0". This activates the fan
motor at half-speed rotation.
When the main unit starts printing, once the fixing assembly's temperature has
reached the target temperature (160ÞC), the CPU (IC301) sends out the half-speed
rotation signal (HALFFAM*) "1". This activates the fan motor drive signal (FAMON),
which in turn raises the electrical voltage to the full speed levels, and full speed rotation
of the fan begins.
The fan continues at full speed rotation until printing is finished. Then, the main
motor (M601) stops and it powers down to half-speed 30 seconds after the printing
operation is completed.
Should there be a problem with the CPU (IC301) for any reason, and the fan motor
does not rotate according to the set timings, the fan motor lock detector signal (FAM-
LOCK) detects this, and outputs an error code (##0325).
DC controller PCB
CPU
(IC301)
COPYRIGHT © 1999 CANON INC.
+24V
Half-speed
rotation signal
(HALFFM*)
Drive circuit
Fan motor lock detection signal
(FMLOCK)
Figure 9-301
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 9 EXTERNAL/AUXILIARY MECHANISM
J308-8
Fan motor drive signal
(FMON)
J308-7
J308-6
FM301
9-7