Controlling The Laser Scanner Motor - Canon iR6570 series Service Manual

Chapter 6
[1] Laser drive IC
DC-CON: DC controller PCB

6.3.3 Controlling the Laser Scanner Motor

6.3.3.1 Controlling the Laser Scanner Motor
The machine controls the laser scanner motor so that the motor always rotates at a specific speed.
The control mechanism takes place in the motor speed control block on the DC controller PCB and the reference signal generation block.
The motor speed control block detects the speed detection signal (FG, BD), and compares it against the reference signal generated by the reference signal
generation block; it then controls the acceleration signal (ACC) and the deceleration signal (DEC) so that the motor will rotate at a specific speed.
The machine switches over speed detection to suit the current printer state, thereby reducing the time used to control the scanner motor.
The FG signal is a detection signal used for rough adjustment of the motor speed, while the BD signal is a detection point signal used to fine-tune the motor
speed.
ERROR CODE:
E110 (scanner motor error)
-0001: after the scanner motor has been started up, the FG signal is not detected within a specific period of time, or while the scanner motor is rotating at
a stable speed, the FG signal is not detected.
6-6
Start-up startup -> half speed
half speed -> full speed
STBY half speed
Imaging full speed
Deceleration full speed -> half speed
half speed -> stop
Reference
signal
generation
block
DC controller PCB
T-6-3
FG control
FG -> BD control
FG control
BD control
BD -> FG control
FG control
J116 J2511
FG
ACC
Motor
DEC
speed
control
block
BD
J2701
F-6-6
Laser scanner
motor
M15
BD PCB
0009-4078