[CQ] TaskAlfa 3051Ci faded colors to the back side

[gratiann]

Hello to all,
Have a 3051Ci with 60 K on color and 70 K on B.W
On the Cyan, Magenta and Yellow, the print are faded on the back side of printer.
refreshing the developing unit - no improvement
cleaning the laser unit (system menu) - no improvement
cheking the value of toners level in DevUnit - all ok (512 aprox)
drum refresh (system menu) - no improvement
replace DevUnit - no improvement
replace Drum unit&charge roller - no improvement
replace transfer belt unit - no improvement
when is full color on eack color the output is ok. when is low coverage, the back side of the image is white.

what can be? the lens and mirrors inside the Laser units? the High voltage board? (1 or 2)?
thanks in advance

PS: the mixed color is from scanner


u464.jpgu089 KCMY.pdf

[KYO_OEM]

Re: TaskAlfa 3051Ci faded colors to the back side

lens, polygon motor mirror and mirrors from LSU are a very good idea!

[gratiann]

Re: TaskAlfa 3051Ci faded colors to the back side

But if is the laser, why is not seen this problem on solid colors?

[KYO_OEM]

Re: TaskAlfa 3051Ci faded colors to the back side

for solid colors, laser is working with max. power!

[gratiann]

Re: TaskAlfa 3051Ci faded colors to the back side

i dont know that the laser has more power levels (I thought that the cylinder load is the only variable in determining the degree of color loading)
i will try next days to clean the LSU's and i let you know
thanks

[KYO_OEM]

Re: TaskAlfa 3051Ci faded colors to the back side

you must open the LSU units!
Mostly dust inside, coming from cooling fans

[Tonerkiller]

Re: TaskAlfa 3051Ci faded colors to the back side

clean the polygon mirror.

[Ropariva]

Re: TaskAlfa 3051Ci faded colors to the back side

The mirror faces on the laser polygon mirror become dirty in certain environments and it happens unevenly and to one end due to the rotation. See pic

[tsbservice]

Re: TaskAlfa 3051Ci faded colors to the back side

The mirror faces on the laser polygon mirror become dirty in certain environments and it happens unevenly and to one end due to the rotation. See pic

Yeah poly mirrors sometimes get dirty. No matter brand. Just like in your picture.

[blackcat4866]

Re: TaskAlfa 3051Ci faded colors to the back side

I think I'd concentrate on the magenta and black laser slit glasses. It's not uncommon for the developer to dump more at one end, and if the toner is deep enough, the electronic cleaner just won't do the trick. =^..^=

[J-Tin]

Re: TaskAlfa 3051Ci faded colors to the back side

LSU needs good internal cleaning. If no improvement, may need to replace each of the LSU which are having this issue.

[gratiann]

Re: TaskAlfa 3051Ci faded colors to the back side

The mirror faces on the laser polygon mirror become dirty in certain environments and it happens unevenly and to one end due to the rotation. See pic

yes, this was the problems.
just like in the picture.
after cleaneng poligon mirrors, all is good now.
thanks to all for your support
have a nice day.

[NTS_cz]

Re: TaskAlfa 3051Ci faded colors to the back side

yes, this was the problems.
just like in the picture.
after cleaneng poligon mirrors, all is good now.
thanks to all for your support
have a nice day.

Yes, this was problem as well, thanks' What I found wierd was, that normal prints and printing Status page had this problem, but Service status page from maintenence mode was fine.
And btw there is bulletin "2N4-0032 (F048)" which basically says that you should stick some tape around the plastic covers of each LSU unit.