Canon ir6570 light copy

[mramlawi]

Dear all ,

im facing a weird problem in this series of machine the copy and the print comes light and lighter after many copies or prints ,it looks fine and after i worked on it, its getting light ,not all the page light some times its look at the upper of the page is light and on the down of the page good ,i have cleaning the cylinder and used a geniue toner ,changing the corona wires ,made ccd adj , polished the drum.

i dont know what to do actually

[vigour]

Re: Canon ir6570 light copy

There is an issue with the dev.
Not sure exactly what it is but...
I think the auger to push the toner toward the roller is defective.

[vigour]

Re: Canon ir6570 light copy

Check your ETB also. It causes light copies too
They are rated for 500k, but most last longer

[gensys]

Re: Canon ir6570 light copy

Dear all ,

im facing a weird problem in this series of machine the copy and the print comes light and lighter after many copies or prints ,it looks fine and after i worked on it, its getting light ,not all the page light some times its look at the upper of the page is light and on the down of the page good ,i have cleaning the cylinder and used a geniue toner ,changing the corona wires ,made ccd adj , polished the drum.

i dont know what to do actually

http://www.copytechnet.com/forums/ca...copy-poor.html

[wassem]

Re: Canon ir6570 light copy

Check your ETB also. It causes light copies too
They are rated for 500k, but most last longer

this machine doesn't have ETB

[Canuck]

Re: Canon ir6570 light copy

Check your ETB also. It causes light copies too
They are rated for 500k, but most last longer

No ETB on this machine,,,,corona wires

[Canuck]

Re: Canon ir6570 light copy

Make sure that the primary fan duct(that grey box that you had to remove to get at coronas) is fastened properly. The plastic breaks of the left side of it where the screw goes through, This causes the laser shutter not to open all the way giving you lighter print on the one side of the page. If ok try reseating the laser. Canon modified the laser mount brackets for issues with light prints.

[vigour]

Re: Canon ir6570 light copy

Forget everything I said earlier.
I thought this was Advance 6000

[Canuck]

Re: Canon ir6570 light copy

I have had broken stirring rods in the dev assembly on a couple of these also. Pop the cover off the dev housing and turn the gears to see if the stirring rods and augers all turn

[mramlawi]

Re: Canon ir6570 light copy

Make sure that the primary fan duct(that grey box that you had to remove to get at coronas) is fastened properly. The plastic breaks of the left side of it where the screw goes through, This causes the laser shutter not to open all the way giving you lighter print on the one side of the page. If ok try reseating the laser. Canon modified the laser mount brackets for issues with light prints.

thanks all for your response ,
but my friend Cauck if the fan plastic is broken that cause a black copy not a light one it will give you a dark copy cos the shutter will not be open all ,thanks again for all your ideas

[vigour]

Re: Canon ir6570 light copy

thanks all for your response ,
but my friend Cauck if the fan plastic is broken that cause a black copy not a light one it will give you a dark copy cos the shutter will not be open all ,thanks again for all your ideas

Think again
How can you get a black copy without toner on the dev roller

[Canuck]

Re: Canon ir6570 light copy

thanks all for your response ,
but my friend Cauck if the fan plastic is broken that cause a black copy not a light one it will give you a dark copy cos the shutter will not be open all ,thanks again for all your ideas

I understand your logic...in this machine the laser writes white so you would think it would be dark. What I have seen many times on these when the shutter isn't fully open is that it severely affects potential control. Machine won't fail and error, but dev bias,primary charge,etc get messed up. You get a print with grey background on the one end, but the actual density is very weak

[Canuck]

Re: Canon ir6570 light copy

Kinda reminicent of an NP6045 popping an exposure lamp...black copies, then turn off and on to do potential control, then blanks

[vigour]

Re: Canon ir6570 light copy

I assumed he was referring to your last post about the dev

[zelotprotos]

Re: Canon ir6570 light copy

Dear all ,

im facing a weird problem in this series of machine the copy and the print comes light and lighter after many copies or prints ,it looks fine and after i worked on it, its getting light ,not all the page light some times its look at the upper of the page is light and on the down of the page good ,i have cleaning the cylinder and used a geniue toner ,changing the corona wires ,made ccd adj , polished the drum.

i dont know what to do actually

Have you tried to make a minimum height of the transfer corona.
I found the similar problem on ir5075 then I set the height of transfer corona at minimum value solved this problem.