KM 4050 light prints and copies on one end

[BillyCarpenter]

Re: KM 4050 light prints and copies on one end

Pulling teeth on this one Bill.

So the dev and stuff got changed. And you mention last year or so.. Stuff was in there for some time.

Lift the machine at an angle so the dev can run to that side of the roller. 90 degrees is just to much angle on there. I would say 15 degrees or so.
So get a wooden block and place it under one side of the printer and call it fixed.
Only kidding...

Print 10 pages like that and see if the dev moves. Will not find the stuff i come up with in any manual.

The transition from black to void does not look like laser precision.

I agree. I thought it was a DV problem from the jump.

[Hose1cook]

Re: KM 4050 light prints and copies on one end

It's a Mono machine, no Developer. If he didn't run Sim 130 the developer tank is probably not completely full of toner. Could be the old style charger in that kit which causes a similar issue.

[mantis01]

Re: KM 4050 light prints and copies on one end

Last year when I installed the kit it worked like new.
Only recently has it started to have this issue.
The magnetic roller to is coated uniformly from end to to end.

Is there a way to get to the mirror without completely ripping down the machine?


I am the end user but have some technical knowledge ;-)

[allan]

Re: KM 4050 light prints and copies on one end

It's a Mono machine, no Developer. If he didn't run Sim 130 the developer tank is probably not completely full of toner. Could be the old style charger in that kit which causes a similar issue.

Thanks for the correction.

[blackcat4866]

Re: KM 4050 light prints and copies on one end

There are a couple of possibilities:

It's relatively easy to get the primary charger tipped at an angle when inserting. Make sure it's inserted properly.
Also common, broken transfer bushing or dislodged contact spring.
Yes a dirty polygon mirror or slit glass is possible based on age alone. It will come out from the engine top cover. Relatively easy, but I would check that last.

So is your sample a copy or a print? I would try a print from USB to rule out scanner optics. =^..^=

[kleankopy]

Re: KM 4050 light prints and copies on one end

Looks Transfer Roller Holder is broken on that side

[BillyCarpenter]

Re: KM 4050 light prints and copies on one end

The OP said he could see the void area on the latent image. That would eliminate any transfer issues. I would check the charge assembly being misaligned like blackcat suggested.

[mantis01]

Re: KM 4050 light prints and copies on one end

My photo may not have been the best example. I coped a peace of black plastic sheet. The white edge is not the issue it is the front where it gets light and you can see lines. I have attached a close up of what I am talking about.

IMG_6270.jpg

[blackcat4866]

Re: KM 4050 light prints and copies on one end

Bad news: that's the laser. =^..^=

[JR2ALTA]

Re: KM 4050 light prints and copies on one end

Polygon mirror, clearly, as tsbservice said a while ago. This is a common problem.

You will see a "fog" on one end of each mirror face. Kind of like how a ceiling fan develops dirt on only one side because that's the side to cut into the air.

Thus the light area is only on the bottom of the page.

The only cost to you is some disassembly and a dab of alcohol.

[mantis01]

Re: KM 4050 light prints and copies on one end

Thank you to everyone that commented.
I suspected it was the laser now I just need to figure out how to remove it. I can not fine disassembly instructions for it anywhere

[BillyCarpenter]

Re: KM 4050 light prints and copies on one end

Bad news: that's the laser. =^..^=

I'm curious how you know it's the laser? Is it the lines on the page?

[blackcat4866]

Re: KM 4050 light prints and copies on one end

I'm curious how you know it's the laser? Is it the lines on the page?

I've seen this a few times on other manufacturers, other models, most recently Toshiba e Studio 4505AC. What made it particularly easy to diagnose was the fact that it only affected black images, in three cases:

4505AC Sample2.JPG4505AC Sample1.JPG

=^..^=

[blackcat4866]

Re: KM 4050 light prints and copies on one end

Polygon mirror, clearly, as tsbservice said a while ago. This is a common problem.

You will see a "fog" on one end of each mirror face. Kind of like how a ceiling fan develops dirt on only one side because that's the side to cut into the air.

Thus the light area is only on the bottom of the page.

The only cost to you is some disassembly and a dab of alcohol.

The dirty polygon mirror(s), in my experience, present at overall very light prints and copies, sometimes including laser codes (the machine attempts to overcome the dirt by increasing the intensity of the laser diode, unsuccessfully), though it doesn't hurt to check and/or clean the mirror surfaces (use very soft cloth, scratches easily):

image.jpgimage.jpg

[JR2ALTA]

Re: KM 4050 light prints and copies on one end

The dirty polygon mirror(s), in my experience, present at overall very light prints and copies, sometimes including laser codes (the machine attempts to overcome the dirt by increasing the intensity of the laser diode, unsuccessfully), though it doesn't hurt to check and/or clean the mirror surfaces (use very soft cloth, scratches easily):

[ATTACH=CONFIG]47582[/ATTACH][ATTACH=CONFIG]47583[/ATTACH]

The picture you provide is very dirty. I think the customer tolerated light image on the bottom of the page until the whole page got lighter. But as you can see the greater build up is still on one edge, though, making the bottom of the page lighter than the rest.