Control Panel; Overview; Fans; Fan Control - Canon iR2422 series Service Manual

9.1 Control Panel

9.1.1 Overview

The machine's control panel consists of the following PCBs, and is controlled by the ASIC of the image processor PCB.
The indication on the LCD is in 5 lines (132 x 65 dots).

9.2 Fans

9.2.1 Overview

This machine is provided with a fan to cool the fixing unit.

9.2.2 Fan Control

The fan motor control circuit is shown below.
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
Image Processor
PCB
ASIC
FM1
DC Controller PCB
CPU
FAN FULL
Fan drive
voltage
FAN HALF
switching circuit
Cntrol Panel PCB
Key SW
LED
LCD
F-9-1
F-9-2
+24V
J219
FANDRV
3
GND
2
FAN_LOCK
1
F-9-3
Chapter 9
FM1
0020-4158
0020-4160
0020-4162
9-1