Bizhub 454e - need 2nd opinion

[mojorolla]

454e with CQ issues on copy and print we have laying around the shop. I have 6 of the slower 4e units but of course none of this series.
Have swapped drum and dv units, transfer, reseated laser and connections, firmware, the usual suspects. A panic stop shows that these density variations are occurring before the fuser.
I am leaning towards the laser unit. From the test prints, it looks like one of the laser diodes is failing.
Looking for a second opinion before I waste time or $$ on this older unit.
Thanx
1.jpg2.jpg3.jpg

[copyman]

454e with CQ issues on copy and print we have laying around the shop. I have 6 of the slower 4e units but of course none of this series.
Have swapped drum and dv units, transfer, reseated laser and connections, firmware, the usual suspects. A panic stop shows that these density variations are occurring before the fuser.
I am leaning towards the laser unit. From the test prints, it looks like one of the laser diodes is failing.
Looking for a second opinion before I waste time or $$ on this older unit.
Thanx
1.jpg2.jpg3.jpg

Genuine K/M Toner, Drum & Developer ?

When you had the dev unit out did you look at laser window to see if dirty?

If I think of anything else will post later

[blackcat4866]

It certainly could be laser ... but I've never seen a bad KM laser unit, ever. Atypical of most of the laser issues I've addressed, it's usually not that subtle. =^..^=

[tmmdmmm]

I've seen lasers fail, but never in a way that causes these IQ issues. Normally its mirror rotation/codes
You've pretty much hit all the spots, but have you tried cleaning the slit glass for the laser?

[Toxic]

4e series have some problems with fine dust coming into laser unit and stick to poligon mirrors but in that case ussualy density should be lower on the paper far side.
If you already check everything else i would try to clean write unit.
You can read this topic about that.

C224e Print Quality Issues (Problem & Solution)

[mojorolla]

Using all OEM and I physically removed / cleaned the laser, but I did not open it. The LD printouts are what caught my interest as the LD adjustment patterns description in the manual is "wood grain", which is what I am getting. Machine runs Stabilizer in image adjustments without issue.

Blackcat...never...? Now that is interesting.

[tsbservice]

I have 2 failed LSUs on C224e...but they failed with different symptom - many fine lines main scan direction. But yes can be LSU.

[Toxic]

This is recently problem on C258, laser could cause different error patterns.
Top part of image is after laser cleaning and bottom is before cleaning.
My customer describe it like paper is needleworked

C258 laser.jpg

[tsbservice]

This is recently problem on C258, laser could cause different error patterns.
Top part of image is after laser cleaning and bottom is before cleaning.
My customer describe it like paper is needleworked

C258 laser.jpg

Excellent work!

[emujo2]

Even if it was a laser diode (which I highly doubt) you have to remember that each diode would be writing a line..If you had one not operating, or weak, you would see a greyscale checkerboard in your black areas..From my experience, the polygon mirrors do get dirty but tend to accumulate the dust on the edge of the mirrors, not the full length. I think you have another issue..I'm assuming the samples you posted are 1 from a good machine, one from you problem child and the 1/w tone from the same problem child. If a diode was bad, it would detect it during H-Sync. E