
Chapter 5
5-4
5.2 Various Controls
5.2.1 Controlling the Laser Activation Timing
5.2.1.1 Laser Emission ON/OFF Control
0020-4080
The purpose of this control is to turn ON/OFF the laser diode (LD) in response to video signals.
The DC controller PCB sends laser control signals (CNTRL0, CNTRL1, and CNTRL2), which are used to switch between laser driver operation modes, to the laser
driver IC along with video signals (VDO1, /VDO1). The laser driver IC controls laser emission (ON/OFF) according to the combination of CNTRL0, CNTRL1,
and CNTRL2 signals.
The following table shows combinations of laser control signals (CNTRL0, CNTRL1, and CNTRL2).
5.2.1.2 Horizontal Synchronization Control
0020-4082
The purpose of this control is to adjust the position where scanning starts in the horizontal direction (main scan direction) of the image with reference to the hori-
zontal synchronization signal (/BD) sent from the BD sensor in the laser scanner. The horizontal synchronization signal is also used as a vertical synchronization
signal to recognize the leading edge of paper. Upon detection of arrival of the fed paper at the prescribed position, the DC controller PCB starts sending the /BD
signal to the image porcessor PCB. The image processor PCB recognizes the leading edge of paper at the start of the continuous /BD signal; it recognizes the trailing
edge of paper at the end of the continuous /BD signal.
5.2.2 Controlling the Intensity of Laser Light
5.2.2.1 Automatic Photocurrent Control (APC)
0020-4083
The purpose of this control is to monitor the laser beam emitted to the photodiode on the laser driver circuit board in order to adjust the light quantity.
Laser control signal
Laser
status
Description
CTL2
CTL1
CTL0 Laser A
0
0
0
OFF
Laser control OFF
0
0
1
ON
Laser beams can be emitted in
response to video signals.
0
1
0
ON
APC over laser
0
1
1
OFF
Forced stop of laser emission
Summary of Contents for iR2318 series
Page 1: ...May 12 2014 Service Manual iR2422 2420 2320 2318 Series ...
Page 2: ......
Page 6: ......
Page 16: ...Contents ...
Page 17: ...Chapter 1 Introduction ...
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Page 50: ......
Page 51: ...Chapter 2 Installation ...
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Page 58: ...Chapter 2 2 4 7 Left cover front 15 Right cover upper 8 Manual feed tray 16 Right cover lower ...
Page 62: ...Chapter 2 2 8 8 Manual feed tray 16 Right cover lower ...
Page 64: ...Chapter 2 2 10 8 Manual feed tray 16 Right cover lower ...
Page 89: ...Chapter 2 2 35 ...
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Page 91: ...Chapter 3 Main Controller ...
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Page 103: ...Chapter 4 Original Exposure System ...
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Page 135: ...9 Remove the reader heater left 1 Connector 2 1 pc Screw 3 1 pc F 4 73 2 3 1 ...
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Page 137: ...Chapter 5 Laser Exposure ...
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Page 148: ...Chapter 5 5 8 ...
Page 149: ...Chapter 6 Image Formation ...
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Page 165: ...Chapter 7 Pickup Feeding System ...
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Page 192: ...Chapter 7 7 24 ...
Page 193: ...Chapter 8 Fixing System ...
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Page 207: ...Chapter 9 External and Controls ...
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Page 229: ...Chapter 10 Maintenance and Inspection ...
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Page 235: ...Chapter 11 Standards and Adjustments ...
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Page 241: ...Chapter 12 Correcting Faulty Images ...
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Page 257: ...Chapter 13 Self Diagnosis ...
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Page 269: ...Chapter 14 Service Mode ...
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Page 287: ...Chapter 15 Upgrading ...
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Page 295: ...Chapter 16 Service Tools ...
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Page 301: ...Chapter 17 Backup Data ...
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Page 303: ...Contents Contents 17 1 Backup Data 17 1 ...
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