Chapter 7
7-10
A pattern image for image gradation correction
Image gradation correction pattern is formed on the position away from ETB center to right and left in the following order.
ETB 1st round
1) Pattern image for adjustment of LED light intensity
Y, C, M pattern is printed on the left side only.
This pattern is to adjust the light intensity of the LED for the color displacement/image density sensor (left).
2) Pattern for timing reference
Bk pattern is printed on the same position at right and left.
This pattern is to measure the timing of step 3), 4) and 5).
3) ETB base
The machine measures the ETB base condition of the same position with the halftone patch that is measured at the 2nd round of ETB.
This is to measure the density of halftone patch accurately. The timing is determined with using the pattern printed at step 2).
ETB 2nd round
4) Pattern for density condition
Halftone patch of Bk, Y, C, M is printed on the left side only.
Measures the density condition of each color. The timing is determined with using the pattern printed at step 2).
5) Pattern for turn-on density detection
Halftone patch of Bk, Y, C, M is printed on the right side only.
This is to detect the turn-on density of each color (the printable minimum density). The timing is determined with using the pattern printed at step 2).
F-7-15
Vertical synchronous
signal position
Vertical synchronous
signal position
1) Pattern image for adjustment
of LED light intensity
2) Pattern for timing reference
3) ETB base
ETB 1st round
ETB 2nd round
4) Pattern for
density condition
5) Pattern for turn-on
density detection
The pattern printed
at ETB 1st round
Summary of Contents for imageCLASS MF8450c
Page 16: ...Chapter 1 Introduction ...
Page 55: ...Chapter 2 Basic Operation ...
Page 61: ...Chapter 3 Main Controller ...
Page 75: ...Chapter 4 Original Exposure System ...
Page 88: ...Chapter 5 Original Feeding System ...
Page 105: ...Chapter 6 Laser Exposure ...
Page 113: ...Chapter 7 Image Formation ...
Page 150: ...Chapter 8 Pickup and Feed System ...
Page 184: ...Chapter 9 Fixing System ...
Page 200: ...Chapter 10 External and Controls ...
Page 230: ...Chapter 11 Maintenance and Inspection ...
Page 233: ...Chapter 12 Measurement and Adjustments ...
Page 237: ...Chapter 13 Correcting Faulty Images ...
Page 260: ...Chapter 14 Error Code ...
Page 272: ...Chapter 15 Special Management Mode ...
Page 280: ...Chapter 16 Service Mode ...
Page 322: ...Chapter 17 Upgrading ...
Page 327: ...Chapter 17 17 4 3 Click Next F 17 4 4 Select a USB connected device and click Next F 17 5 ...
Page 328: ...Chapter 17 17 5 5 Click Start F 17 6 6 Click Yes F 17 7 Download will be started F 17 8 ...
Page 330: ...Chapter 18 Service Tools ...
Page 334: ...Appendix ...
Page 349: ......