DC242 over toning on black

[chrisio]

Hi.

My dc242 is leaving a slight scattering of black toner over the entire sheet of paper- its so slight that when I scan the image its not picked up but if you hold the sheet next to a unprinted sheet you can see the difference.

The black drum is recent (82% remaining) , the black dev is recent (within 20k pages), I have checked the values for toner density and according to the service manual they are well within tolerance, the ATC sensor values look correct.

Any idea where I go from here?

Thanks
CHris

[InterfaceP]

Re: DC242 over toning on black

Probably the K BIAS PWB. Its located on the left side under the panel where the UI attaches.

[chrisio]

Re: DC242 over toning on black

Probably the K BIAS PWB. Its located on the left side under the panel where the UI attaches.

Thanks. Where in the service manual does it refer to this? Nothing comes up when searching for it.

Cheers

[InterfaceP]

Re: DC242 over toning on black

Thanks. Where in the service manual does it refer to this? Nothing comes up when searching for it.

Cheers

PL 11.2 Item 2

[chrisio]

Re: DC242 over toning on black

Thanks.

Is this the board https://www.iteminconline.com/105k20...loper-bias.htm

Is there any tests I can do or is it a case of swap it out and hope its correct.

[chrisio]

Re: DC242 over toning on black

I have the new board coming in the next day or so. Is it just a case of swapping the board and all my troubles will be resolved ir do I need to set it up?


Thanks
Chris