Chapter 8
8-23
PS2: Arch sensor
PS16: Arch sensor 2
M3: Fixing motor
3. Control Sequence
The sequence of arch control is shown as below.
a. Starting arch monitoring
Start arch monitoring from the point where the leading edge of paper enters fixing (the point of reaching the fixing nip).
b. Detection of the arch level
Two arch sensors detect the arch level.
- Arch sensor 2 (PS16): Detects large arch (sagging)
- Arch sensor (PS2): Detects small arch (sagging)
F-8-27
Reference:
This machine has two different sensors to detect large and small arch respectively to prevent noise and faulty image.
If there is large arch when a paper passes through the secondary transfer roller, the paper with large arch will straighten and noise occurs. If a paper hits somewhere,
faulty image (including soiled paper edge, etc) may occur.
To prevent this symptom, make the arch level of a paper smaller before passing through the secondary transfer roller so that the paper passes through the secondary
transfer roller without a large arch.
c. Speed control for the fixing motor (M3)
Control the fixing motor (M3) according to ON / OFF of the arch sensor (PS2) and the arch sensor 2 (PS16) to change the feeding speed.
In the former part of the control, keep the arch level large while the arch sensor 2 (PS16) detects large arch. In the latter part, keep the arch level small while the
arch sensor (PS2) detects small arch.
In both sensors, increase the fixing feeding speed when the sensor is ON (the arch level becomes larger). Decrease the fixing feeding speed when the sensor is OFF
(the arch level is smaller). This control keeps the arch level optimum.
For heavy paper and OHT, the arch sensor (PS2) usually controls only small arch.
There is no arch control for envelope.
F-8-28
The feeding speeds at the sensor ON / OFF are shown as below.
T-8-11
Constant speed
Half speed
1 / 4 speed
Process speed
143.0 mm/s
71.5 mm/s
35.8 mm/s
Arch sensor ON
(Increasing the fixing feeding speed)
146.8 mm/s
73.4 mm/s
36.7 mm/s
PS16
Detection of large arch
Detection of small arch
PS2
During arch control
At the point where the leading edge of
paper reaches the fixing nip
At the point where the
trailing edge of paper
has passed the secondary
transfer roller
Only detection of small arch by PS2
For heavy paper / OHT
For plain paper
Switch PS16 / PS2 due to the
distance of paper delivered from fixing
- LTR or less:
Trail edge of paper 20%
- More than LTR:
Trail edge of paper 50%
Decreasing the fixing
feeding speed
Same as process speed
Increasing the fixing
feeding speed
PS16 detects large arch
(Approx. 510 msec for A4)
PS2 detects small arch
(Approx. 108 msec for A4)
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...
Page 24: ......
Page 26: ......
Page 52: ......
Page 53: ...Chapter 2 Installation...
Page 54: ......
Page 127: ...Chapter 3 Basic Operation...
Page 128: ......
Page 130: ......
Page 136: ......
Page 137: ...Chapter 4 Main Controller...
Page 138: ......
Page 160: ......
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...
Page 190: ......
Page 192: ......
Page 206: ......
Page 207: ...Chapter 7 Image Formation...
Page 208: ......
Page 256: ......
Page 257: ...Chapter 8 Pickup Feeding System...
Page 258: ......
Page 262: ......
Page 303: ...Chapter 9 Fixing System...
Page 304: ......
Page 306: ......
Page 321: ...Chapter 10 Externals and Controls...
Page 322: ......
Page 326: ......
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...
Page 360: ......
Page 362: ......
Page 401: ...Chapter 12 RDS...
Page 402: ......
Page 404: ......
Page 411: ...Chapter 13 Maintenance and Inspection...
Page 412: ......
Page 414: ......
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...
Page 422: ......
Page 424: ......
Page 431: ...Chapter 15 Correcting Faulty Images...
Page 432: ......
Page 434: ......
Page 459: ...Chapter 16 Self Diagnosis...
Page 460: ......
Page 462: ......
Page 481: ...Chapter 17 Service Mode...
Page 482: ......
Page 484: ......
Page 571: ...Chapter 18 Upgrading...
Page 572: ......
Page 574: ......
Page 603: ...Chapter 19 Service Tools...
Page 604: ......
Page 606: ......
Page 609: ...Aug 29 2006...
Page 610: ......