Service manual

Chapter 9
9-2
F-9-3
9.2.2 Overview (iR2020i/iR2016i)
0012-6050
iR2016i / iR2020i
This machine is provided with a fan to cool the fixing unit.
F-9-4
9.2.3 Fan Control
0011-2096
iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The fan motor control circuit is shown below.
F-9-5
Switching between full-speed rotation and half-speed rotation is controlled as described below.
1) Full-speed control
When the CPU on the DC controller outputs a fan full speed signal (FAN_FULL), the fan drive voltage switching circuit supplies a +24 V fan drive voltage to turn
the heat exhaust fan at the full speed.
2) Half-speed control
When the CPU on the engine controller outputs a fan half speed signal (FAN_HALF), the fan drive voltage switching circuit supplies a +16 V fan drive voltage to
turn the heat exhaust fan at the half speed.
FM1
FM1
J219
+24V
FM1
FANDRV
GND
FAN_LOCK
Fan drive
voltage
switching circuit
CPU
DC Controller PCB
3
2
1
FAN FULL
FAN HALF