Chapter 6
6-5
F-6-4
MEMO:
1. The laser power is adjusted automatically when the laser unit is replaced.
2. When the manual feed tray is used as the source of paper, the write operation starts when the registration paper sensor (PS29) detects paper.
SERVICE MODE:
DISPLAY> DPOT> LLMT-P
indicates the laser power voltage control value for printer (PDL) imaging.
DISPLAY> DPOT> LLMT
indicates the laser power voltage control value for copier imaging.
DISPLAY> DPOT> LPOWER-P
indicates the result of potential control for the laser intensity used during printer (PDL) imaging.
DISPLAY> DPOT> LPOWER-C
indicates the result of potential control for the laser intensity used during copier imaging.
DISPLAY> MISC> LPOWER
indicates the laser intensity in real time.
ADJUST> LASER> PVE-OFST
used to adjust the laser incident point.
FUNCTION> LASER> POWER
used to turn on laser light.
6.3.2.2 APC Control
0009-5252
The machine executes APC control so that the laser light will remain at a constant level by adjusting the output of the laser diode mounted on the laser
driver.
The control mechanism takes place on the DC control PCB.
The DC controller sends the laser control signal (CTL0=0, CTL1=1) to the laser driver IC on the laser driver PCB.
In response, the laser driver IC sets APC mode, and forces the laser diode (LD) to emit light.
While all this is under way, the laser driver IC monitors the laser diode (LD) by means of a photo diode (PD), and adjusts the output of the laser diode unit
so that the intensity is at a specific level.
F-6-5
J117
J113
J121
LD(+) [1]
5.5V
LD(-) [1]
GND
LWRPD [4]
Laser driver PCB
DC controller
PCB
J102
[6]
J101
Laser block
Laser
Intensity
monitor [5]
Laser
drive
circuit
EEPROM
3
2
1
B2
9
8
7
5
4
3
2
1
6
1
2
3
5
6
7
8
4
4
3
2
1
GND
LZ-LDPSEL[7]
GND
Laser write
start sensor (PS28)
Laser unit
GND
GND
CTL1[3]
CTL0[2]
[1]
Laser Driver
5V
PD
LD
CTL1
CTL0
DC-CON
J101
J121
Summary of Contents for iR5570 Series
Page 1: ...Mar 29 2005 Service Manual iR6570 5570 Series ...
Page 2: ......
Page 6: ......
Page 26: ...Contents ...
Page 27: ...Chapter 1 Introduction ...
Page 28: ......
Page 30: ......
Page 55: ...Chapter 2 Installation ...
Page 56: ......
Page 58: ...Contents 2 9 3 Mounting the Cassette Heater 2 34 ...
Page 98: ......
Page 99: ...Chapter 3 Basic Operation ...
Page 100: ......
Page 102: ......
Page 110: ......
Page 111: ...Chapter 4 Main Controller ...
Page 112: ......
Page 114: ......
Page 135: ...Chapter 5 Original Exposure System ...
Page 136: ......
Page 181: ...Chapter 6 Laser Exposure ...
Page 182: ......
Page 184: ......
Page 192: ......
Page 193: ...Chapter 7 Image Formation ...
Page 194: ......
Page 198: ......
Page 259: ...Chapter 8 Pickup Feeding System ...
Page 260: ......
Page 350: ......
Page 351: ...Chapter 9 Fixing System ...
Page 352: ......
Page 401: ...Chapter 10 External and Controls ...
Page 402: ......
Page 406: ......
Page 448: ......
Page 449: ...Chapter 11 MEAP ...
Page 450: ......
Page 452: ......
Page 455: ...Chapter 12 Maintenance and Inspection ...
Page 456: ......
Page 458: ......
Page 468: ......
Page 469: ...Chapter 13 Standards and Adjustments ...
Page 470: ......
Page 505: ...Chapter 14 Correcting Faulty Images ...
Page 506: ......
Page 508: ......
Page 537: ...Chapter 15 Self Diagnosis ...
Page 538: ......
Page 540: ......
Page 565: ...Chapter 16 Service Mode ...
Page 566: ......
Page 568: ......
Page 633: ...Chapter 17 Upgrading ...
Page 634: ......
Page 636: ......
Page 641: ...Chapter 17 17 5 F 17 4 HDD Boot ROM Flash ROM System Software ...
Page 646: ...Chapter 17 17 10 F 17 11 8 Click START F 17 12 ...
Page 675: ...Chapter 17 17 39 F 17 59 2 Select the data to download F 17 60 3 Click Start ...
Page 677: ...Chapter 18 Service Tools ...
Page 678: ......
Page 680: ......
Page 683: ...Mar 29 2005 ...
Page 684: ......