[Misc] ImagePress C1+ - Vertical stripes, all colours

[mynameis]

Hello everyone.

One of our C1's is printing horizontal stripes when printing PG5 on 128 density (50%).
PG10 looks perfect, as it has 100% density.

Toner is ceramic toner, with selenium red instead of magenta. I know that original toner should be used, but this toner is running on many other machines perfectly. So the toner is not the cause.

What i tried so far:

- Changed image drum assy from another machine
- Changed main and secondary corona assy from another machine
- Changed secondary transfer voltage in paper type

Didn't help anything.

Machine has 50k prints, developer material fillings are brandnew.

Any suggestions on how to continue are highly appreciated.
See pics attached for details.


EDIT:
Looking further through the sm, i found the hint attached. (pic "C1 drive gear")

Even if the intervall is not 4mm (it is more between 1 and 1,5 mm), could these stripes be drive-related somehow?

And: Canon tells in the service manual to change the gears, but does not give a workflow description...was there a bulletin for this threat? I assume i will have to either remove the complete D-Kit and P-Kit assys to get to the gears, or work my way through from the backside of the machine, having to remove main controller PCB, Tensioner, etc.
Either way looks like a lot of work, and i'd rather try some other things first..

[zoraldinho]

Re: ImagePress C1+ - Vertical stripes, all colours

Horisontal stripes is a drive problem,and yes it's a lot of work but I never solve this issue on C1 with this bulletin.You can get better picture with gradation and full calibration.Vertical stripes comes from developer.Refill developers with new developer.Use exact procedure for that and for calibration.Always use new grid plate.It's not expensive.

Good luck!

[mynameis]

Re: ImagePress C1+ - Vertical stripes, all colours

Thanks Zoraldinho.


i disassembled all possible culprit motors from a spare part C1.
The Question is now, which one should i suspect most to cause the horizontal lines?
I think it is not the Development Wheel drive, as the gear and big wheel gear are both made of metal and the motor seems pretty stable..

I want to make sure i change the right part, as it is somehow complicated to get to these motors, especially on a working machine.

Anyone had this problem and solved it?

[zoraldinho]

Re: ImagePress C1+ - Vertical stripes, all colours

Horizontal stripes are not connected with drive gears.For cross Feed Banding / Pitch Lines (vetrical) Teckat post some bulletins here:

http://www.copytechnet.com/forums/canon/69306-imagepress-c1-c1-__uneven-density-halftone-images-6-4mm-intervals.html?highlight=imagepress

http://www.copytechnet.com/forums/canon/48276-imagepress-c1-c1-cross-feed-banding-pitch-lines-asked-re-post-pub-2010-a.html?highlight=imagepress

For horizontal stripes inspect developers,itb and change grid plate.

[mynameis]

[zoraldinho]

Re: ImagePress C1+ - Vertical stripes, all colours

That's right.Lines from long edge to long edge are horizontal lines and they are not related with any drive issues.

[mynameis]

Re: ImagePress C1+ - Vertical stripes, all colours

=]

So now i am really confused. How could vertical lines be drive associated?
By the way, the pages on my pics are A3 sized and are feed is short edge first...

Maybe i should have meantioned this earlier.

[zoraldinho]

Re: ImagePress C1+ - Vertical stripes, all colours

A3 size is different story.Sorry. I had to ask first.

[Benjamin98]

Re: ImagePress C1+ - Vertical stripes, all colours

Hi,

I would suggest check simple things first before you start stripping working machines for parts.
Have you checked the laser unit? Or even more simpler, the dust-proof glass between the laser and the drum. This I've found can also cause those lines especially if they are in the feed direction.

This uneven density seems to be a common problem with the C1's...I have changed that Drum/ITB drive assembly before and it made no difference at all!

[mynameis]

Re: ImagePress C1+ - Vertical stripes, all colours

Hi,

I would suggest check simple things first before you start stripping working machines for parts.
Have you checked the laser unit? Or even more simpler, the dust-proof glass between the laser and the drum. This I've found can also cause those lines especially if they are in the feed direction.

This uneven density seems to be a common problem with the C1's...I have changed that Drum/ITB drive assembly before and it made no difference at all!

Thanks Benjamin98,

stripes are not in feed direction. Thus the laser dust protection glass can't be the cause. I've checked it anyways, it is perfectly clean.
Changed all development-related motor/drive units - without making any difference.
Changed image drum, Coronas, no change.
Now thinking about changing the transfer section...

How should i check the laser unit?
Any suggestions?

[zoraldinho]

Re: ImagePress C1+ - Vertical stripes, all colours

Hi,

I would suggest check simple things first before you start stripping working machines for parts.
Have you checked the laser unit? Or even more simpler, the dust-proof glass between the laser and the drum. This I've found can also cause those lines especially if they are in the feed direction.

This uneven density seems to be a common problem with the C1's...I have changed that Drum/ITB drive assembly before and it made no difference at all!

That's right! Uneven density is a common problem with the C1. We replaced everithing which could be replaced with no difference.Canon Europe raised his hands of this problem.
Rotating developer system is completely missed!

[Ricardo25]

[netugur]

Re: ImagePress C1+ - Vertical stripes, all colours

Replace with a new drum cleaning blade. I had the same problem. I changed a lot of parts. Finally drum improved by changing the cleaning blade.