irc2880 Registration

[Guest]

Hello,

I'm an electronics engineer but not particularly familiar with copiers. I've got a registration issue at the bottom of pages as can be seen by the attached PG 6/8/10/12 #1 printouts.

I saw this thread : http://www.copytechnet.com/forums/ca...-problems.html , so I followed all the instructions:

Run Auto Color Mismatch Correction ==========


Auto Color Mismatch Correction corrects Color Registration issues. To access Auto Color mismatch correction, select the following.

Addition Functions > Adjustments and Cleaning > Auto Color Mismatch Correction

*(If Auto color correction mismatch is not an option, be sure to update the firmware to the latest version. To clean the patch sensors manually actuate the solenoid to open the shutters and wipe the sensors with a dry lint free cloth.)


---then do A Full Auto Gradation

Some registration problems can be resolved by clearing out the Registration Data stored in the DC Controller. To clear the data, perform the following.

Enter Service Mode: Level 2 > Copier > Function > Clear > Reg/Clear. Highlight Reg/Clear and press OK.
After performing the clear, reboot the machine and perform a Gradation Quick Adjust and then a Full Gradation adjust.

I then did a PG6/8/10, which is also attached #2 printout.

It seems that it's improved, but still not perfect. Can anyone offer any further suggestions about what to do?

Thanks,

Tom.

IRC2880i Scan post cleaning DC Reg and autoadjusting.pdfIRC2880i Scan prior to clearing DC Reg data.pdf

[teckat]

Re: irc2880 Registration

Hello,

I'm an electronics engineer but not particularly familiar with copiers. I've got a registration issue at the bottom of pages as can be seen by the attached PG 6/8/10/12 #1 printouts.

I saw this thread : http://www.copytechnet.com/forums/ca...-problems.html , so I followed all the instructions:



I then did a PG6/8/10, which is also attached #2 printout.

It seems that it's improved, but still not perfect. Can anyone offer any further suggestions about what to do?

Thanks,

Tom.

[ATTACH]32704[/ATTACH][ATTACH]32705[/ATTACH]

__________________

That is a Main Scan issue (front [operator side] to rear [non-operator] side of printer.

Try the simple first >
Remove the noise dampening pad for the Registration sensor flag and then performing Reg-Clear, Quick Adjust and then adjusting the IMG-REG procedure_ power\off_on.
✔ check test prints.

Could be a Laser Issue, make sure the ITB UNIT is locked down on both ends.

[JPiek]

Re: irc2880 Registration

Did you clean the patch sensors ? Had problems with color adjustment on a 2220, after cleaning patch sensors and a color correction prints where just fine...

[Jake2o]

Re: irc2880 Registration

Make up an A3 test print of your own, and print it.
Here's a link to mine http://www.jtek.co.uk/images/pdf_doc...2015020301.pdf
i've always found that using Canon internal test prints can make you look for faults that are not there on actual prints.
Spent days looking at Reg issues after a PG10 wasn't aligned how I expected it to be. But actual print from PC was fine.
Is the paper going in straight to start off with?

[teckat]

Re: irc2880 Registration

UN16: color displacement sensor A = (also serves as patch image sensor)
UN15: color displacement sensor B

Color Displacement Correction Control

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i
The machine performs the following 3 types of control to correct displacement of color possibly caused by differences among components of its laser scanner unit
and drum unit:
- main scanning write start correction
- sub scanning write start correction
- main scanning magnification correction control
The DC controller forms patterns for detection of color displacement for individual colors, and uses the color displacement sensor to detect the position of the patterns.
The DC controller computes the degree of displacement with reference to the position of the pattern detected; based on the result, the DC controller or the main
controller corrects the displacement for individual colors.

Color displacement detection signal.jpg



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Controlling Synchronization in Main Scanning Direction

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i

The machine controls synchronization in main scanning direction to ensure the write start position of individual lines in main scanning direction.
Synchronization occurs for each line of each color, and is controlled by the DC controller.
The following is the sequence of operation:
1) The DC controller sets the Bk laser control signal to APC mode (LC_CTLP4(0)=0, LC_CTLP4(1)=1), thus forcing the laser diode of the Bk driver circuit to go
on.
2) The laser beam path is equipped with a BD circuit used to receive the beam.
3) The BD circuit detects the laser beam, generates the reference BD signal (BD RAW1), and sends the result to the DC controller.
4) In response, the DC controller sends these reference BD signals to the main controller in the form of the main scanning sync signals (BD Y, BD M, BD C,
BD Bk).
5) When these signals arrive, the main controller sends video signals (VDO Y, VDO M, VDO C, VDO Bk) to the DC controller a specific period of time thereafter;
as a result, the respective laser drivers go on to emit laser beams that will scan the surface of the photosensitive drum starting at a specific point of individual
lines.

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