Chapter 6
6-10
F-6-11
6.2.3 Controlling the Laser Scanner Motor
6.2.3.1 Controlling the Speed of the Laser Scanner Motor
0013-8536
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
The machine controls the laser scanner motor so that it rotates at a specific speed.
The control mechanism is governed by the motor speed control block and the reference signal generation block according to the instructions from the CPU of the
DC controller.
The motor speed control block compares the speed detection signal (FG, BD) against the reference signal generated by the reference signal generation block to
control the acceleration signal (ACC) and the deceleration signal (DEC) so that the scanner motor rotates at a specific speed.
The machine uses 2 speed detection signals with the aim of helping the laser scanner unit last longer (Notes). The FG signal is a detection signal for coarse adjust-
ment used at time of motor start-up, while the BD signal is a detection signal used to fine-adjust the motor to the target speed.
The motor control mechanism operates as follows:
1) The DC controller turns on the ACC signal, thus causing the scanner motor to rotate.
2) The DC controller uses the result of FG signal detection to control the ACC signal and the DEC signal so that the motor will rotate at a specific speed.
3) The DC controller switches from the FG signal to the BD signal; then, using the result of BD signal detection, controls the ACC signal and the DEC signal so
that the motor will continuously rotate at the target speed.
Laser Driver IC
5V
PD
LD
LC_CTL_P3(1)
LC_CTL_P3(0)
D-CON
Laser
Relay
PCB
CBk- Laser Driver
Laser Driver IC
5V
PD
LD
LC_CTL_P4(1)
LC_CTL_P4(0)
Summary of Contents for iR C3380 series
Page 1: ...Aug 29 2006 Service Manual iR C3380 2880 Series...
Page 2: ......
Page 6: ......
Page 23: ...Chapter 1 Introduction...
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Page 52: ......
Page 53: ...Chapter 2 Installation...
Page 54: ......
Page 127: ...Chapter 3 Basic Operation...
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Page 130: ......
Page 136: ......
Page 137: ...Chapter 4 Main Controller...
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Page 161: ...Chapter 5 Original Exposure System...
Page 162: ......
Page 188: ...Chapter 5 5 24 F 5 68 4 Remove the original sensor 2 hook 1 F 5 69...
Page 189: ...Chapter 6 Laser Exposure...
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Page 207: ...Chapter 7 Image Formation...
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Page 257: ...Chapter 8 Pickup Feeding System...
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Page 303: ...Chapter 9 Fixing System...
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Page 321: ...Chapter 10 Externals and Controls...
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Page 336: ...Chapter 10 10 10 F 10 10 2 Remove the check mark from SNMP Status Enabled...
Page 337: ...Chapter 10 10 11 F 10 11...
Page 359: ...Chapter 11 MEAP...
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Page 401: ...Chapter 12 RDS...
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Page 411: ...Chapter 13 Maintenance and Inspection...
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Page 416: ...Chapter 13 13 2 F 13 1 8 9 1 2 3 3 5 6 7 10 11 12 13 14 4...
Page 421: ...Chapter 14 Standards and Adjustments...
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Page 431: ...Chapter 15 Correcting Faulty Images...
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Page 459: ...Chapter 16 Self Diagnosis...
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Page 481: ...Chapter 17 Service Mode...
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Page 571: ...Chapter 18 Upgrading...
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Page 603: ...Chapter 19 Service Tools...
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Page 609: ...Aug 29 2006...
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