Bd Correction Control - Canon imageRUNNER ADVANCE C5500 Series Service Manual

DC Controller
(UN1)
Related Error Code
• E100-0100: BD signal was not detected although a specified period of time had passed during operation of the Laser Scanner
(Y, M).
• E100-0102: Correction in timing of laser exposure to the Polygon Mirror (Y, M) was not completed within the specified period
of time.
• E100-0300: BD signal was not detected although a specified period of time had passed during operation of the Laser Scanner
(C, Bk).
• E100-0302: Correction in timing of laser exposure to the Polygon Mirror (C, Bk) was not completed within the specified period
of time.
• E102-0101: An error in check sum of EEPROM on the Laser Scanner was detected (Y, M).
• E102-0301: An error in check sum of EEPROM on the Laser Scanner was detected (C, Bk).

BD Correction Control

Purpose
Corrects the displacement of each color's laser write start position due to the varied angle of the Scanner Mirror surface.
Execution timing
At power-on, and at each print
Control description
1. The Main Controller measures the BD interval after the completion of constant speed rotation control of the Scanner Motor.
2. The Main Controller calculates the correction value from the displacement of the BD interval.
3. The write start position is corrected by correcting the write start timing based on the above correction value.
Laser Driver
PCB (M)
Scanner
BD Sensor
Motor
(YM)
Control
Signal
Laser Driver
PCB (Y)
Laser Driver
PCB (Bk)
BD Sensor
(CBk)
Scanner
Motor
Control
Signal
Laser Driver
PCB (C)
72
Laser Scanner Unit 1
Scanner Motor
(YM)
ACC1
DEC1
FG1
Laser Scanner Unit 2
Scanner Motor
(CBk)
ACC2
DEC2
FG2
2. Technology