c454e mystery blue line?

[copyman]

This is a weird one! Blue line on color prints only (see attached samples). Black prints & "copying" no line.

Replaced cyan drum & developer unit and didn't help. Transfer belt new. Cleaned laser prints heads. All individual color test pages in service mode have blue line but not black test pages.

What really has me stumped is color copies are good, no line.

Any help appreciated.
Thanks in advance

[tsbservice]

Re: c454e mystery blue line?

This is strange. Are you sure color copies are clear, line is kinda faint maybe it's there but almost invisible because otherwise my mind can't accept this problem It's late but I would think about it a little, very interested in your findings please keep us informed.

[copyman]

Re: c454e mystery blue line?

This is strange. Are you sure color copies are clear, line is kinda faint maybe it's there but almost invisible because otherwise my mind can't accept this problem It's late but I would think about it a little, very interested in your findings please keep us informed.

Yes I thought copies being fine was strange but they do not have the line. Doesn't make sense because same process is used to produce the image.

The line isn't faint it's because I had to reduce the photo to attach here.

Attached is another close up photo.

Will update with the fix. I always like to post what fix was, especially with strange issues like this.

Thanks

[ronny2502]

Re: c454e mystery blue line?

Hello,

is this line visible on test prints: "Halftone Pattern CMYK"

(activateded option "Front half" can be helpful sometimes)


The line exceeds normal print area (as far as I can recognize), doesn't it?


Regards,
Ro

[copyman]

Re: c454e mystery blue line?

Hello,

is this line visible on test prints: "Halftone Pattern CMYK"

(activateded option "Front half" can be helpful sometimes)


The line exceeds normal print area (as far as I can recognize), doesn't it?


Regards,
Ro

Line is in same place in the normal print area. Sorry for the photos, had to reduce them so they would attach.

Even if you take the copies being fine out of the equation it's still strange where this line is coming from. Actually tried 3 different drums, also swappped the color drums around, then new cyan dev unit. Still same line in same place with original drum and all the drums I tried. If it was a pile of toner inside (which I checked) the blue line would be on black prints as well.

[Albonline]

Re: c454e mystery blue line?

scans and prints use different areas of system ram. does the line look like its segmented or have any digital artifacts?

[copyman]

Re: c454e mystery blue line?

scans and prints use different areas of system ram. does the line look like its segmented or have any digital artifacts?

Good to know. The line does not look digital. It's like lines I've seen many times due to bad drum. I thought this was going to be a quick service call, replace cyan drum and out the door....man was I wrong!

Thanks for the reply

[Synaux]

Re: c454e mystery blue line?

Good to know. The line does not look digital. It's like lines I've seen many times due to bad drum. I thought this was going to be a quick service call, replace cyan drum and out the door....man was I wrong!

Thanks for the reply

As noted, that does not look "digital" to my eye, but I would run the i/o checks in SM just in case.

Do you have a microscope? If not, use the highest power magnifier and see if there are any appreciable artifact of other colors. I had a similar issue years ago that if I recall, was the transfer belt, but never would have guessed it without the aide of a very close inspection.

[copyman]

Re: c454e mystery blue line?

Update:

I went back to machine and printed halftone test pages. Black, magenta & yellow are fine but cyan halftone has a faint white line in same place as the blue line that is showing on prints. Hope this helps to figure out what could be the issue.
I'm thinking it has to do with the laser unit but would think laser unit would only leave a white line not a color line?

Thanks again for the help

[ronny2502]

Re: c454e mystery blue line?

Hello,

if DEV+Drum+TransferBelt already replaced and still issues, I would give "PrintHeadAssy" ( A4FJR70133 ) a chance. (But only if you can get an used one.)

Ro

[EarthKmTech]

Re: c454e mystery blue line?

check cyan led erase array. If one LED is dead shorted (wired in series) and not illuminating, you will have a continuous ring of non erased garbage.

[Synaux]

Re: c454e mystery blue line?

check cyan led erase array. If one LED is dead shorted (wired in series) and not illuminating, you will have a continuous ring of non erased garbage.

You are correct....but this machine is exhibiting issues on certain modes only.

I am fairly certain that there is no special operation for the LED operation for copy vs print