2. Fan motor control
The printer has a fan motor as a cooling (air inlet) fan.
Figure 2-2-12 shows the fan motor control circuit.
Figure 2-2-12
The fan motor is a DC brushless motor with hall elements, and is unified with the motor drive
circuit.
At the same time as start of fixing temperature control, the CPU (IC501) sets the FON of No.
76 pin to “L” and rotates the fan motor at its full speed by setting the FAN DRIVE signal (/FON)
to the voltage level of full speed rotation.
At the same time as completion of fixing temperature control, the CPU sets FHALF of No. 71
pin to “L” and switches the fan motor drive from full-speed rotation to half-speed rotation by
reducing the /FON signal to the voltage level of half-speed rotation. 30 seconds later, by setting
the FON to “H,” the voltage is not supplied to the /FON signal and the fan motor stops.
During the fan motor rotation, if the FAN LOCK signal (FLOCK) becomes “H” for more than 2
seconds continuously, the CPU reports the fan motor failure to the video controller.
This printer also measures the temperature inside the printer. If it gets high, it automatical-
ly rotates the fan motor to lower the temperature.
During the standby mode, the CPU measures the temperature inside the printer with TH501.
If it is higher than the prescribed temperature, it rotates the fan motor for about 4 seconds at
full speed and then for about 20 minutes at half speed to lower the temperature.
2 - 21
CHAPTER 2
Engine controller PCB
J54-1
71
IC501
CPU
FHALF
+3.3V
+24VA
76
FON
31
FANTH
/FON
FM101
Cooling fan
TH501
J43-2
J43-1
J54-3
88
FLOCK
+3.3V
J54-2
FLOCK
Содержание LBP1760P
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