CHAPTER 2

2. Fan motor control

This printer has 4 heat exhausting fans and an air intake fan. They are DC brushless motors. The figure below shows the fan motor control circuit.

 

DC controller PCB

 

 

 

 

 

 

 

Multi-purpose

 

 

 

 

Multi-purpose

P121

53

tray fan motor

 

 

 

 

tray fan

 

J229-1

FAN5D J34-3 J35-1

 

 

drive circuit

 

 

 

 

-2

/FAN5S

-2

-2

FM5

IC201

 

 

-3

GND

-1

-3

 

 

 

 

 

 

 

 

(CUP)

 

 

 

 

 

 

Fixing unit/

 

 

 

 

 

 

 

Scanner unit

 

 

 

 

 

 

 

fan

 

 

 

J216-1

FAN2D

 

 

 

P120

52

 

-2

/FAN2S

 

 

FM2

 

 

-3

GND

 

 

 

 

 

 

 

 

 

P61

37

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electrical unit

 

 

 

 

 

 

 

fan

 

 

 

J210-1

FAN3D J12-3 J13-1

 

 

 

 

-2

/FAN3S

-2

-2

FM3

 

 

 

-3

GND

-1

-3

 

 

 

 

 

 

 

 

Power supply

DC14

124

 

 

 

 

 

fan

 

 

 

 

 

 

 

 

J208-1

FAN1D

 

 

 

 

 

 

 

 

 

DA04

64

 

-2

/FAN1S

 

 

FM1

 

 

 

-3

GND

 

 

 

IC202

 

 

 

 

 

 

 

(G.A.)

 

 

 

 

 

 

 

DA05

65

Fan motor

 

 

 

 

Fixing unit fan

 

drive circuit

 

 

 

 

 

 

 

J225-1

FAN4D J25-3 J26-1

 

 

 

 

 

DA03

61

 

-2

/FAN4S

-2

-2

FM4

 

 

 

-3

GND

-1

-3

 

Figure 2-2-14

When the power switch of the printer is turned ON, the CPU (IC201) on the DC controller sets the No.53 pin to "H" and rotates the multi-purpose tray fan (FM5) at half speed for about 15 sec- onds. The CPU sets the No.65 pin to "H" via the gate array (IC202), and rotates the power sup- ply fan (FM1), fixing unit/scanner fan (FM2), electrical unit fan (FM3), and fixing unit fan (FM4) at half speed.

When it receives a /PRNT signal from the video controller, the CPU rotates FM1, FM2, FM3, and FM4 at full speed and FM5 at half speed (full speed in case of duplex printing). When the main motor drive stops after printing, the CPU rotates FM1, FM2, FM3, and FM4 at full speed for about 30 seconds then at half speed. The CPU rotates FM5 at half speed for about 30 sec- onds (full speed for about 30 seconds in case of duplex printing).

The drive voltages output from the fan motor drive circuit and multi-purpose tray fan motor

2 - 24

Page 64
Image 64
Canon 3260 manual Fan motor control, Cup