[CQ] IRadvC7260i- Colour Mismatch

[MunsterTech]

hi,

I am going to a IRadvc7260i tomorrow with blurred copies on colours, another tech has cleaned the patch sensors and made sure the shutter was moving correctly, one thing he was concerned about was that Auto Colour Mismatch failed every time he attempted it. I would like to know exactly what this Mismatch does, what controls it and what causes it to fail...any help gratefully received.

tks MT

[guitar9199]

Re: IRadvC7260i- Colour Mismatch

Had one of these a good while back, and Canon Help Desk walked me through a service mode setting that "re-Homed" the laser units. After that, Color Mismatch and gradation worked just fine.

I can't remember what those settings were... I've slept since then, but if you call Canon help line they can walk you right to it.

[Tricky]

Re: IRadvC7260i- Colour Mismatch

Had one of these a good while back, and Canon Help Desk walked me through a service mode setting that "re-Homed" the laser units. After that, Color Mismatch and gradation worked just fine.

I can't remember what those settings were... I've slept since then, but if you call Canon help line they can walk you right to it.

Print off a PG6 and look fir the colour that's out of position.

Lv.2 and perform LD-ADJ-? colour thats out

COPIER > FUNCTION > LASER
LD-ADJ-Y	Restore Y Skew Crrct Motor initial pstn
	Details	When Y-color skew volume in vertical scanning direction is larger than estimation, the Skew Correction Motor (Y) is locked, and color displacement cannot be corrected even when color displacement correction control is executed. This item places the Skew Correction Motor (Y) to the center position in such cases.
Use case	When replacing the Laser Scanner Unit to identify the failure position
Adj/set/operate method	Select the item, and then press OK key.
Display/adj/set range	During operation: ACTIVE, When operation fnished normally: OK!
Default value	0
Required time	10

[onlyinnewfoundland]

Re: IRadvC7260i- Colour Mismatch

Try doing AT-IMG-X in service > copier > function > misc-p

That is basically a coarse adjustment compared to what you can do in user modes.

[MunsterTech]

Re: IRadvC7260i- Colour Mismatch

hi guys,

Went to the machine today, some weird issues, at first glance it looks as if only the Magenta registration is off by about 1.5 mm, all the other colours seem fine, however....The colour mismatch didnt work at first, so took out the ITB assy, cleaned the patch sensors, checked the ITB and cleaned contacts etc...mismatch then decided to work but made no difference to registration. Cleaned registration sensors too. Did laser skew adjustment, still no difference. Did a DC back up, cleared the DC and did the DC res, AT-IMG-X failed and auto colour mismatch failed again too. Took out the magenta drum/dev assy, checked and reseated, but still no difference. The Magenta CQ is not great so have ordered a new magenta dev but dont think that will resolve the registration issue. Bit concerned why the AT-IMG-X fails along with the mismatch...poss DC issue? Will wait for the dev to arrive and see how that goes when replaced then will upgrade the firmware.

[onlyinnewfoundland]

Re: IRadvC7260i- Colour Mismatch

hi guys,

Went to the machine today, some weird issues, at first glance it looks as if only the Magenta registration is off by about 1.5 mm, all the other colours seem fine, however....The colour mismatch didnt work at first, so took out the ITB assy, cleaned the patch sensors, checked the ITB and cleaned contacts etc...mismatch then decided to work but made no difference to registration. Cleaned registration sensors too. Did laser skew adjustment, still no difference. Did a DC back up, cleared the DC and did the DC res, AT-IMG-X failed and auto colour mismatch failed again too. Took out the magenta drum/dev assy, checked and reseated, but still no difference. The Magenta CQ is not great so have ordered a new magenta dev but dont think that will resolve the registration issue. Bit concerned why the AT-IMG-X fails along with the mismatch...poss DC issue? Will wait for the dev to arrive and see how that goes when replaced then will upgrade the firmware.

Can you post a pic?

is the magenta skewed at all?

[MunsterTech]

Re: IRadvC7260i- Colour Mismatch

i have some samples in the car which i havent had time to scan to my e mail yet, i did a pg6 and 10, on the 6 the magenta grid can be seen but when it goes to the top of the page the registration seems pretty good, so i guess it could be skewed. ill try and get up the samples asap

[randall]

Re: IRadvC7260i- Colour Mismatch

i have some samples in the car which i havent had time to scan to my e mail yet, i did a pg6 and 10, on the 6 the magenta grid can be seen but when it goes to the top of the page the registration seems pretty good, so i guess it could be skewed. ill try and get up the samples asap

imageRUNNER ADVANCE C7260 / C7270
Title : Magenta Color Registration is Skewed Causing Lines to be Not Aligning Properly
Problem :

The magenta color registration is skewed causing lines to be not aligning properly. When a PG6 internal test print is run, you can see a definite skew with magenta not lining up with the other colors. Running an ITB init had no effect.The Auto correct color mismatch and AT IMG X adjustments both failed.



Solution :

In this case, replacing the magenta laser resolved the magenta image skew. Before the magenta laser was replaced, it was swapped with another color to confirm if would fix the registration skew.

The part number for the magenta laser is FM3-5000-000.

[MunsterTech]

Re: IRadvC7260i- Colour Mismatch

hi,

sorry for the delay, the IQ mite not be the best, did it on a irc2220, in a warehouse, but if you zoom in you can see the magenta is skewing off, on the pg 6 you can see at the bottom edge the CQ is perfect, laying on top of each other spot on, but at the top of the page you can see the magenta skewed off by about 1.5mm. Laser adj in level 2 doesnt help.

tks MT

[onlyinnewfoundland]

Re: IRadvC7260i- Colour Mismatch

Any solution to this after?

[MunsterTech]

Re: IRadvC7260i- Colour Mismatch

Any solution to this after?

Yea sorry guys, didnt put up the fix, totally slipped my mind, faulty laser in the end. Can swap these lasers around, so swapped with another colour and the fault followed, so ordered a new laser and fixed the issue.

[Rachid.Akli]

Re: IRadvC7260i- Colour Mismatch

Hi,
It is always a nice feeling after resolving such an issues !!!
I would like to add a comment for this kind of color mismatch.
When looking at the PG TYPE 6, we can see that the mismatch is not uniform along the horizontal direction and it concerns only one side: The rear or the front. In this particular situation, it is always due to the laser. And you confirmed it.

Thaks for sharing.

Rachid.