Various Controls - Canon imageRUNNER 5065 series Service Manual

Chapter 6

6.3 Various Controls

6.3.1 Controlling the Laser Activation Timing
6.3.1.1 Generating the Sync Signal
iR5065 / iR 5055 / iR5075 / / /
The BD signal used to synchronize the video signal in laser scanning direction is generated by the BD PCB with reference to the laser beam reflected by the BD
mirror mounted on the laser beam optical path. The CCD/AP PCB reads the image signal from the CCD, and sends it to the controller block. The controller block,
in response, executes image processing, and sends the result as a video signal to the laser driver PCB by way of the video PCB and as the laser intensity control
signal to the laser unit.
6.3.1.2 Flow of the Sync Signal
iR5065 / iR 5055 / iR5075 / / /
[1] BD signal (upon detection of laser light, '0').
[2] phase matching is executed with reference to the printer, and the synch signal is generated.
[3] reads the image data from the image memory in keeping with the printer sync signal.
[4] video signal
[5] converts the 2-pixel parallel signal into a signal-pixel serial signal.
[6] laser drive signal (drives the laser unit according to the video signal).
BD PCB
Jxxxx
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Laser
J4500
driver
15
PCB 14
13
12
11
10
9
8
7
6
5
4
3
2
1
ERROR DODE:
E100
Issued when the BD signal is not detected within a specific period of time after the laser has been turned on.
6.3.2 Controlling the Intensity of Laser Light
6.3.2.1 Controlling the Laser Intensity
iR5065 / iR 5055 / iR5075 / / /
The laser driver circuit serves to drive the semi-conductor laser with reference to the laser drive signal (LD) coming from the DC controller PCB.
The laser drive circuit is associated with the following items of control:
- laser activation control
- laser intensity control (APC control)
- laser intensity control to suit the drum surface potential
6-2
Main power switch ON
WMUP CNTR WLSTR
Laser scanner
motor(M15)*
Half speed
Image leading edge
signal(PTOP)
Video signal
Laser
BD signal(BD)
Video PCB
Jxxxx
1 24V
2 ACC
3 DEC
4 GND
5 FG
6 5V
7 BD
8 GND
9 ERMDI
10 ERMDO
11 ERMSK
12 ERMCS
13 GND
14 3.3V
J1411
15 GND
14 (N.C.)
13 CSU
12 DIR
11 DIO
10 SCLK
9 GND
8 SDCLK
7 GND
6 CTL2
5 CTL1
4 CTL0
3 APC-SEL
2 GND
1 +5V
Start key ON
STBY INTR PRINT
Full speed
F-6-2
DC controller
PCB
J1401 Jxxxx
1 1 ???
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 27
28 28
29 29
30 30
F-6-3
LSTR STBY
Half speed
Controller
PHSYNC
VIDEO
0015-4425
0015-4426
0015-4427